/* ============================================================
   KRIPTOLAB — CSS (Grid Layout)
   ============================================================ */
:root {
    --bg:  #04080f;
    --bg2: #070d1a;
    --bg3: #0c1525;
    --bg4: #111e33;
    --c1:  #00d4ff;
    --c2:  #ff6b35;
    --c3:  #00ff88;
    --c4:  #b24bff;
    --c5:  #ff4757;
    --c6:  #ffc107;
    --c7:  #17c3b2;
    --c8:  #ff6b9d;
    --c9:  #a8ff78;
    --text:  #dce8f5;
    --text2: #7a9bbf;
    --text3: #3d5a7a;
    --border: rgba(0,212,255,0.15);
    --radius: 16px;
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Nunito', sans-serif;
    font-size: 16px;
    line-height: 1.7;
    overflow-x: hidden;
}

/* CANVAS */
#matrix-canvas {
    position: fixed; top:0; left:0;
    width:100%; height:100%;
    opacity: 0.04;
    pointer-events: none;
    z-index: 0;
}

/* ============================================================
   TOP BAR
   ============================================================ */
.topbar {
    position: fixed; top:0; left:0; right:0;
    height: 64px; z-index: 200;
    background: rgba(4,8,15,.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 28px;
}
.topbar-logo { display:flex; align-items:center; gap:12px; }
.topbar-logo-icon {
    width:36px; height:36px;
    background: linear-gradient(135deg, var(--c1), var(--c4));
    border-radius:10px;
    display:flex; align-items:center; justify-content:center;
    font-size:18px;
}
.topbar-logo-text { font-family:'Orbitron',monospace; font-weight:700; font-size:16px; color:var(--c1); }
.topbar-logo-sub  { font-size:9px; color:var(--text3); letter-spacing:2px; text-transform:uppercase; }

.topbar-score-area { display:flex; align-items:center; gap:18px; }
.topbar-progress-wrap { display:flex; align-items:center; gap:10px; }
.topbar-progress-bar {
    width:120px; height:6px; background:var(--bg4); border-radius:3px; overflow:hidden;
}
.topbar-progress-fill { height:100%; background:linear-gradient(90deg,var(--c1),var(--c4)); border-radius:3px; width:0; transition:width .6s ease; }
.topbar-progress-txt { font-family:'Orbitron',monospace; font-size:11px; color:var(--text2); white-space:nowrap; }

.topbar-score-badge {
    display:flex; flex-direction:column; align-items:center;
    background:rgba(255,193,7,.08); border:1px solid rgba(255,193,7,.25);
    border-radius:10px; padding:5px 14px; min-width:70px;
}
.topbar-score-label { font-size:8px; color:var(--c6); letter-spacing:2px; text-transform:uppercase; font-weight:700; }
.topbar-score-val { font-family:'Orbitron',monospace; font-size:16px; color:var(--c6); font-weight:700; transition:all .4s; }

.topbar-results-btn {
    background:var(--bg4); border:1px solid var(--border);
    color:var(--text2); padding:8px 16px; border-radius:10px;
    font-size:13px; font-weight:700; cursor:pointer;
    font-family:'Nunito',sans-serif; transition:all .2s; white-space:nowrap;
}
.topbar-results-btn:hover { border-color:var(--c1); color:var(--c1); }
.topbar-results-btn.ready {
    background:linear-gradient(135deg,var(--c1),var(--c4));
    color:var(--bg); border-color:transparent;
    animation: pulse-glow 1.5s ease infinite;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
    min-height:100vh; display:flex; align-items:center; justify-content:center;
    text-align:center; padding:100px 40px 60px; position:relative; overflow:hidden;
}
.hero::before {
    content:''; position:absolute;
    width:700px; height:700px;
    background: radial-gradient(circle, rgba(0,212,255,.07) 0%, transparent 70%);
    top:50%; left:50%; transform:translate(-50%,-50%);
    pointer-events:none;
}
.hero-inner { position:relative; z-index:1; }
.hero-badge {
    display:inline-flex; align-items:center; gap:8px;
    background:rgba(0,212,255,.1); border:1px solid rgba(0,212,255,.3);
    border-radius:50px; padding:8px 20px;
    font-size:13px; color:var(--c1); letter-spacing:1px;
    text-transform:uppercase; margin-bottom:32px;
    animation:fadeInUp .6s ease both;
}
.hero-title {
    font-family:'Orbitron',monospace;
    font-size: clamp(42px,6vw,80px); font-weight:900; line-height:1.1;
    margin-bottom:20px; animation:fadeInUp .6s .1s ease both;
}
.hero-title .line1 {
    background:linear-gradient(135deg,#fff 0%,var(--c1) 100%);
    -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}
.hero-title .line2 {
    background:linear-gradient(135deg,var(--c4) 0%,var(--c8) 100%);
    -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
    font-size:.52em; display:block; letter-spacing:8px; margin-top:8px;
}
.hero-desc {
    font-size:18px; color:var(--text2); max-width:580px;
    margin:0 auto 40px; animation:fadeInUp .6s .2s ease both;
}
.hero-stats {
    display:flex; justify-content:center; gap:48px;
    animation:fadeInUp .6s .3s ease both; margin-bottom:50px; flex-wrap:wrap;
}
.stat-num { font-family:'Orbitron',monospace; font-size:36px; font-weight:700; color:var(--c1); display:block; }
.stat-label { font-size:12px; color:var(--text2); text-transform:uppercase; letter-spacing:1.5px; }
.hero-cta {
    display:inline-flex; align-items:center; gap:10px;
    background:linear-gradient(135deg,var(--c1),var(--c4));
    color:var(--bg); padding:16px 36px; border-radius:50px;
    font-weight:800; font-size:16px; cursor:pointer; border:none;
    text-decoration:none; animation:fadeInUp .6s .4s ease both;
    transition:transform .2s, box-shadow .2s;
}
.hero-cta:hover { transform:translateY(-2px); box-shadow:0 8px 30px rgba(0,212,255,.4); }

/* ============================================================
   LEVELS GRID
   ============================================================ */
.levels-section { padding:40px 32px 80px; max-width:1280px; margin:0 auto; position:relative; z-index:1; }
.levels-header { text-align:center; margin-bottom:48px; }
.levels-title { font-family:'Orbitron',monospace; font-size:clamp(22px,3vw,32px); font-weight:700; color:var(--c1); margin-bottom:8px; }
.levels-sub   { font-size:15px; color:var(--text2); }

.levels-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

/* LEVEL CARD */
.lv-card {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: 18px;
    overflow: hidden;
    cursor: pointer;
    transition: all .35s cubic-bezier(.4,0,.2,1);
    position: relative;
    display: flex; flex-direction: column;
}
.lv-card::before {
    content:''; position:absolute; top:0; left:0; right:0; height:3px;
    background: linear-gradient(90deg, var(--lc), transparent);
}
.lv-card:hover {
    transform: translateY(-6px);
    border-color: var(--lc);
    box-shadow: 0 12px 40px rgba(0,0,0,.5), 0 0 30px color-mix(in srgb, var(--lc) 15%, transparent);
}
.lv-card.completed {
    border-color: color-mix(in srgb, var(--lc) 40%, transparent);
}
.lv-card.completed::after {
    content:'✓'; position:absolute; top:14px; right:14px;
    width:28px; height:28px; border-radius:50%;
    background: var(--lc); color:var(--bg);
    display:flex; align-items:center; justify-content:center;
    font-size:14px; font-weight:700;
}

.lv-card-num {
    position: absolute; top:14px; left:18px;
    font-family:'Orbitron',monospace; font-size:11px; font-weight:700;
    color: var(--lc); opacity:.6; letter-spacing:2px;
}
.lv-card-body { padding:48px 24px 20px; flex:1; }
.lv-card-icon { font-size:42px; margin-bottom:14px; display:block; }
.lv-card-title { font-family:'Orbitron',monospace; font-size:15px; font-weight:700; color:var(--text); margin-bottom:8px; }
.lv-card-desc  { font-size:13px; color:var(--text2); line-height:1.6; }

.lv-card-footer {
    padding: 14px 24px 18px;
    border-top: 1px solid var(--border);
    display:flex; align-items:center; gap:14px;
}
.lv-pbar-wrap {
    flex:1; height:5px; background:var(--bg4); border-radius:3px; overflow:hidden;
}
.lv-pbar { height:100%; width:0; border-radius:3px; background:var(--lc); transition:width .6s ease; }
.lv-status {
    font-family:'Orbitron',monospace; font-size:10px; font-weight:700;
    color: var(--lc); white-space:nowrap; letter-spacing:1px;
}

/* ============================================================
   SCORE STRIP
   ============================================================ */
.score-strip {
    position: relative; z-index:1;
    background: var(--bg3); border-top:1px solid var(--border);
    padding: 28px 32px;
}
.score-strip-inner {
    max-width:1280px; margin:0 auto;
    display:flex; align-items:center; justify-content:space-between; gap:20px;
    flex-wrap:wrap;
}
.score-strip-inner span { font-size:14px; color:var(--text2); }
.score-strip-btn {
    background:linear-gradient(135deg,var(--c1),var(--c4));
    color:var(--bg); padding:12px 28px; border-radius:50px;
    font-weight:800; font-size:14px; cursor:pointer; border:none;
    font-family:'Nunito',sans-serif; transition:all .2s;
}
.score-strip-btn:hover { transform:translateY(-2px); box-shadow:0 8px 30px rgba(0,212,255,.3); }

/* ============================================================
   LEVEL MODAL (full-screen overlay per level)
   ============================================================ */
.lv-modal {
    position:fixed; inset:0; z-index:500;
    background:rgba(4,8,15,.97);
    overflow-y:auto;
    backdrop-filter:blur(6px);
}
.lv-modal-inner { max-width:920px; margin:0 auto; min-height:100vh; display:flex; flex-direction:column; }

.lv-modal-topbar {
    position:sticky; top:0; z-index:10;
    background:rgba(7,13,26,.96);
    backdrop-filter:blur(12px);
    border-bottom:1px solid var(--border);
    padding:14px 28px;
    display:flex; align-items:center; justify-content:space-between;
}
.lv-modal-ttl { display:flex; align-items:center; gap:14px; }
.lv-modal-icon { font-size:28px; }
.lv-modal-num { font-family:'Orbitron',monospace; font-size:10px; color:var(--lc); letter-spacing:2px; text-transform:uppercase; }
.lv-modal-name{ font-family:'Orbitron',monospace; font-size:16px; font-weight:700; }

.lv-modal-nav  { display:flex; align-items:center; gap:8px; }
.lv-nav-btn {
    background:var(--bg4); border:1px solid var(--border);
    color:var(--text2); padding:8px 16px; border-radius:8px;
    font-size:12px; font-weight:700; cursor:pointer; transition:all .2s;
    font-family:'Nunito',sans-serif;
}
.lv-nav-btn:hover { border-color:var(--c1); color:var(--c1); }
.lv-nav-next { background:linear-gradient(135deg,var(--c1),var(--c4)); color:var(--bg); border-color:transparent; }
.lv-nav-next:hover { box-shadow:0 4px 20px rgba(0,212,255,.3); }
.lv-close-btn {
    width:36px; height:36px; border-radius:8px;
    background:var(--bg4); border:1px solid var(--border);
    color:var(--text2); cursor:pointer; font-size:16px;
    display:flex; align-items:center; justify-content:center;
    transition:all .2s; margin-left:4px;
}
.lv-close-btn:hover { border-color:var(--c5); color:var(--c5); background:rgba(255,71,87,.1); }

.lv-modal-body { padding:40px 28px 80px; flex:1; }

/* ============================================================
   REUSED INNER STYLES (sections, cards, demos, quizzes)
   ============================================================ */
.section-header { display:flex; align-items:flex-start; gap:24px; margin-bottom:50px; }
.section-num {
    font-family:'Orbitron',monospace; font-size:72px; font-weight:900;
    line-height:1; opacity:.12; flex-shrink:0;
}
.section-title-group h2 { font-family:'Orbitron',monospace; font-size:clamp(22px,3vw,34px); font-weight:700; margin-bottom:8px; }
.section-title-group p  { font-size:15px; color:var(--text2); }

[data-section="1"] .section-num,[data-section="1"] h2 { color:var(--c1); }
[data-section="2"] .section-num,[data-section="2"] h2 { color:var(--c2); }
[data-section="3"] .section-num,[data-section="3"] h2 { color:var(--c3); }
[data-section="4"] .section-num,[data-section="4"] h2 { color:var(--c4); }
[data-section="5"] .section-num,[data-section="5"] h2 { color:var(--c5); }
[data-section="6"] .section-num,[data-section="6"] h2 { color:var(--c6); }
[data-section="7"] .section-num,[data-section="7"] h2 { color:var(--c7); }
[data-section="8"] .section-num,[data-section="8"] h2 { color:var(--c8); }
[data-section="9"] .section-num,[data-section="9"] h2 { color:var(--c9); }

/* CARDS */
.cards { display:grid; gap:20px; }
.cards-2 { grid-template-columns:repeat(2,1fr); }
.cards-3 { grid-template-columns:repeat(3,1fr); }
.cards-4 { grid-template-columns:repeat(4,1fr); }
.card {
    background:var(--bg3); border:1px solid var(--border);
    border-radius:var(--radius); padding:28px;
    transition:all .3s; position:relative; overflow:hidden;
}
.card::before {
    content:''; position:absolute; top:0; left:0; right:0; height:3px;
}
[data-section="1"] .card::before { background:linear-gradient(90deg,var(--c1),transparent); }
[data-section="2"] .card::before { background:linear-gradient(90deg,var(--c2),transparent); }
[data-section="3"] .card::before { background:linear-gradient(90deg,var(--c3),transparent); }
[data-section="4"] .card::before { background:linear-gradient(90deg,var(--c4),transparent); }
[data-section="5"] .card::before { background:linear-gradient(90deg,var(--c5),transparent); }
[data-section="6"] .card::before { background:linear-gradient(90deg,var(--c6),transparent); }
[data-section="7"] .card::before { background:linear-gradient(90deg,var(--c7),transparent); }
[data-section="8"] .card::before { background:linear-gradient(90deg,var(--c8),transparent); }
[data-section="9"] .card::before { background:linear-gradient(90deg,var(--c9),transparent); }
.card:hover { border-color:rgba(0,212,255,.3); transform:translateY(-3px); box-shadow:0 10px 30px rgba(0,0,0,.4); }
.card-icon { font-size:36px; margin-bottom:16px; display:block; }
.card h3  { font-family:'Orbitron',monospace; font-size:15px; font-weight:700; margin-bottom:10px; }
.card p   { font-size:14px; color:var(--text2); line-height:1.65; }
.example  {
    margin-top:14px; padding:10px 14px;
    background:var(--bg4); border-radius:8px;
    font-family:'JetBrains Mono',monospace; font-size:12px;
    color:var(--c3); border-left:3px solid var(--c3);
}

/* DEMO BOX */
.demo-box {
    background:var(--bg2); border:1px solid var(--border);
    border-radius:var(--radius); overflow:hidden; margin:28px 0;
}
.demo-header {
    background:var(--bg4); padding:13px 20px;
    display:flex; align-items:center; gap:12px;
    border-bottom:1px solid var(--border);
}
.demo-dots { display:flex; gap:6px; }
.demo-dot  { width:12px; height:12px; border-radius:50%; }
.demo-dot:nth-child(1) { background:#ff5f57; }
.demo-dot:nth-child(2) { background:#ffbd2e; }
.demo-dot:nth-child(3) { background:#28c840; }
.demo-title { font-family:'JetBrains Mono',monospace; font-size:13px; color:var(--text2); }
.demo-body  { padding:24px; }

/* INPUTS */
.input-group { display:flex; flex-direction:column; gap:8px; margin-bottom:16px; }
.input-label { font-size:12px; color:var(--text2); text-transform:uppercase; letter-spacing:1px; font-weight:700; }
input[type="text"], input[type="number"], textarea {
    background:var(--bg4); border:1px solid var(--border);
    border-radius:10px; padding:12px 16px;
    color:var(--text); font-family:'JetBrains Mono',monospace;
    font-size:14px; width:100%; outline:none; transition:border-color .2s;
}
input:focus, textarea:focus { border-color:var(--c1); box-shadow:0 0 0 3px rgba(0,212,255,.1); }
textarea { min-height:80px; resize:vertical; }

/* BUTTONS */
.btn { padding:11px 24px; border-radius:10px; border:none; cursor:pointer; font-weight:700; font-size:14px; transition:all .2s; font-family:'Nunito',sans-serif; }
.btn-primary { background:linear-gradient(135deg,var(--c1),var(--c4)); color:var(--bg); }
.btn-primary:hover { transform:translateY(-1px); box-shadow:0 4px 20px rgba(0,212,255,.3); }
.btn-secondary { background:var(--bg4); color:var(--text); border:1px solid var(--border); }
.btn-secondary:hover { border-color:var(--c1); color:var(--c1); }
.btn-row { display:flex; gap:10px; flex-wrap:wrap; }

/* OUTPUT */
.output-box {
    background:var(--bg); border:1px solid var(--border);
    border-radius:10px; padding:14px 16px;
    font-family:'JetBrains Mono',monospace; font-size:13px;
    color:var(--c3); min-height:50px; word-break:break-all; margin-top:12px;
}
.output-box.info    { color:var(--c1); }
.output-box.warning { color:var(--c6); }
.output-box.text    { color:var(--text); }

/* NUMBER CONVERTER */
.converter-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; margin-top:16px; }
.conv-label { font-family:'Orbitron',monospace; font-size:11px; font-weight:700; text-transform:uppercase; letter-spacing:1px; margin-bottom:8px; display:block; }

/* RANGE SLIDER */
input[type="range"] {
    -webkit-appearance:none; appearance:none; width:100%; height:6px;
    background:var(--bg4); border-radius:3px; outline:none; cursor:pointer;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance:none; appearance:none; width:20px; height:20px;
    background:var(--c1); border-radius:50%; cursor:pointer;
    box-shadow:0 0 10px rgba(0,212,255,.5);
}

/* MORSE */
.morse-output {
    font-family:'JetBrains Mono',monospace; font-size:20px;
    letter-spacing:3px; color:var(--c6); padding:20px;
    background:var(--bg); border-radius:10px; word-break:break-word;
    min-height:60px; border:1px solid var(--border); margin-bottom:16px;
}

/* FREQUENCY CHART */
.freq-chart {
    display:flex; align-items:flex-end; gap:4px;
    height:180px; padding:10px;
    background:var(--bg); border-radius:10px;
    border:1px solid var(--border); overflow-x:auto; flex-wrap:nowrap;
}
.freq-bar-group { display:flex; flex-direction:column; align-items:center; gap:4px; }
.freq-bar { width:24px; background:linear-gradient(180deg,var(--c8),var(--c4)); border-radius:4px 4px 0 0; transition:height .5s ease; min-height:4px; }
.freq-bar-label { font-family:'Orbitron',monospace; font-size:10px; color:var(--text3); }

/* RLE */
.rle-visual { display:flex; gap:4px; flex-wrap:wrap; }
.rle-block { padding:10px 14px; border-radius:8px; font-family:'JetBrains Mono',monospace; font-size:16px; font-weight:700; }

/* PARITY */
.parity-bits { display:flex; gap:8px; align-items:center; flex-wrap:wrap; }
.parity-bit-box {
    width:52px; height:52px; border-radius:10px;
    display:flex; align-items:center; justify-content:center;
    font-family:'Orbitron',monospace; font-size:22px; font-weight:700;
    cursor:pointer; transition:all .2s; user-select:none;
}
.parity-bit-box.one  { background:rgba(0,255,136,.15); color:var(--c3); border:2px solid var(--c3); }
.parity-bit-box.zero { background:var(--bg4); color:var(--text3); border:2px solid var(--bg4); }
.parity-result { padding:10px 20px; border-radius:10px; font-weight:700; font-size:14px; display:inline-block; margin-top:20px; }
.parity-ok { background:rgba(0,255,136,.1); color:var(--c3); border:1px solid var(--c3); }
.parity-err{ background:rgba(255,71,87,.1); color:var(--c5); border:1px solid var(--c5); }

/* COMPARE TABLE */
.compare-table { width:100%; border-collapse:collapse; margin-top:20px; }
.compare-table th { background:var(--bg4); padding:13px 18px; font-family:'Orbitron',monospace; font-size:11px; color:var(--c1); text-align:left; border-bottom:2px solid var(--border); }
.compare-table td { padding:12px 18px; border-bottom:1px solid var(--border); font-size:14px; }
.compare-table tr:last-child td { border-bottom:none; }
.compare-table tr:hover td { background:var(--bg3); }
.tag { display:inline-flex; padding:4px 10px; border-radius:20px; font-size:12px; font-weight:700; }
.tag-encoding   { background:rgba(0,212,255,.15);  color:var(--c1); }
.tag-encryption { background:rgba(178,75,255,.15); color:var(--c4); }
.tag-hashing    { background:rgba(255,71,87,.15);  color:var(--c5); }
.tag-compression{ background:rgba(255,193,7,.15);  color:var(--c6); }

/* INFO BOX */
.info-box {
    background:rgba(0,212,255,.05); border:1px solid rgba(0,212,255,.2);
    border-radius:var(--radius); padding:18px 22px; margin:20px 0;
    display:flex; gap:16px;
}
.info-box .icon { font-size:22px; flex-shrink:0; }
.info-box p { font-size:14px; color:var(--text); }
.info-box.warning { background:rgba(255,193,7,.05); border-color:rgba(255,193,7,.25); }
.info-box.success { background:rgba(0,255,136,.05); border-color:rgba(0,255,136,.25); }

/* RSA VISUAL */
.rsa-visual { display:flex; align-items:center; justify-content:center; gap:20px; flex-wrap:wrap; margin:30px 0; }
.rsa-box { padding:22px 26px; border-radius:var(--radius); text-align:center; min-width:150px; }
.rsa-arrow { font-size:28px; color:var(--text3); }

/* HASH VISUAL */
.hash-visual { display:flex; align-items:center; gap:16px; margin:20px 0; flex-wrap:wrap; }
.hash-input-box { flex:1; min-width:200px; padding:16px 20px; background:var(--bg3); border-radius:12px; border:1px solid rgba(0,255,136,.3); font-family:'JetBrains Mono',monospace; font-size:14px; }
.hash-arrow { font-size:32px; color:var(--c5); animation:pulse 1.5s infinite; }
.hash-output-box { flex:1; min-width:200px; padding:16px 20px; background:var(--bg3); border-radius:12px; border:1px solid rgba(255,71,87,.3); font-family:'JetBrains Mono',monospace; font-size:11px; color:var(--c5); word-break:break-all; }

/* QUIZ */
.quiz-box { background:var(--bg3); border:1px solid var(--border); border-radius:var(--radius); padding:28px; margin:30px 0; }
.quiz-q { font-size:17px; font-weight:700; margin-bottom:20px; }
.quiz-options { display:grid; grid-template-columns:repeat(2,1fr); gap:12px; }
.quiz-opt { padding:14px 18px; border-radius:10px; border:1px solid var(--border); background:var(--bg4); cursor:pointer; font-size:14px; transition:all .2s; text-align:center; font-weight:600; }
.quiz-opt:hover { border-color:var(--c1); color:var(--c1); }
.quiz-opt.correct { border-color:var(--c3); background:rgba(0,255,136,.1); color:var(--c3); }
.quiz-opt.wrong   { border-color:var(--c5); background:rgba(255,71,87,.1);  color:var(--c5); }
.quiz-result      { margin-top:14px; font-size:14px; font-weight:700; display:none; }

/* SUB HEADING */
.sub-h { font-family:'Orbitron',monospace; font-size:17px; margin-bottom:8px; }

/* DIVIDER */
.divider { height:1px; background:linear-gradient(90deg,transparent,var(--border),transparent); margin:44px 0; }

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp  { from{opacity:0;transform:translateY(30px)} to{opacity:1;transform:translateY(0)} }
@keyframes bounce    { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(-10px)} }
@keyframes pulse     { 0%,100%{opacity:1} 50%{opacity:.4} }
@keyframes pulse-glow{ 0%,100%{box-shadow:0 0 10px rgba(0,212,255,.4)} 50%{box-shadow:0 0 30px rgba(0,212,255,.9),0 0 60px rgba(178,75,255,.5)} }

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar { width:5px; height:5px; }
::-webkit-scrollbar-track { background:var(--bg); }
::-webkit-scrollbar-thumb { background:var(--bg4); border-radius:3px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:1100px) {
    .levels-grid { grid-template-columns:repeat(2,1fr); }
    .lv-modal-body { padding:30px 20px 60px; }
    .cards-2,.cards-3,.cards-4 { grid-template-columns:1fr; }
    .converter-grid { grid-template-columns:repeat(2,1fr); }
}
@media (max-width:768px) {
    .topbar { padding:0 14px; }
    .topbar-progress-wrap { display:none; }
    .topbar-logo-sub { display:none; }
    .hero { padding:90px 20px 50px; }
    .levels-section { padding:30px 16px 60px; }
    .levels-grid { grid-template-columns:1fr 1fr; gap:14px; }
    .lv-card-desc { display:none; }
    .lv-modal-topbar { padding:12px 16px; }
    .lv-modal-body { padding:24px 16px 60px; }
    .lv-nav-btn { padding:6px 10px; font-size:11px; }
}
@media (max-width:500px) {
    .levels-grid { grid-template-columns:1fr; }
    .converter-grid { grid-template-columns:1fr; }
    .quiz-options { grid-template-columns:1fr; }
    .hero-stats { gap:28px; }
    .rsa-visual { flex-direction:column; }
    .hash-visual { flex-direction:column; }
    .topbar-results-btn span { display:none; }
}

/* ============================================================
   SUB-PAGE LAYOUT (sections, sandbox, tools, gelismis_kavramlar)
   ============================================================ */
.page-wrap {
    max-width: 960px;
    margin: 0 auto;
    padding: 100px 28px 80px;
    position: relative;
    z-index: 1;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 36px;
    font-size: 13px;
    color: var(--text2);
}
.breadcrumb a { color: var(--c1); text-decoration: none; transition: color .2s; }
.breadcrumb a:hover { color: #fff; }
.breadcrumb .sep { color: var(--text3); }

/* Page section header */
.pg-section-header {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}
.pg-section-num {
    font-family: 'Orbitron', monospace;
    font-size: 80px;
    font-weight: 900;
    line-height: 1;
    opacity: .09;
    flex-shrink: 0;
    color: inherit;
}
.pg-section-title h1 {
    font-family: 'Orbitron', monospace;
    font-size: clamp(22px,4vw,36px);
    font-weight: 700;
    margin-bottom: 8px;
}
.pg-section-title p { font-size: 15px; color: var(--text2); }

/* Sub-page nav */
.page-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 56px;
    padding-top: 28px;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}
.page-nav .spacer { flex: 1; }

/* Topbar nav button (back) */
.topbar-back-btn {
    background: var(--bg4);
    border: 1px solid var(--border);
    color: var(--text2);
    padding: 8px 16px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    font-family: 'Nunito', sans-serif;
    transition: all .2s;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}
.topbar-back-btn:hover { border-color: var(--c1); color: var(--c1); }

/* ============================================================
   MODULE GRID (Section 04 — Encryption modules)
   ============================================================ */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin: 24px 0;
}
.mod-card {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all .3s;
    position: relative;
    overflow: hidden;
}
.mod-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--c4), transparent);
}
.mod-card:hover {
    border-color: var(--c4);
    transform: translateY(-3px);
    box-shadow: 0 8px 28px rgba(178,75,255,.15);
}
.mod-card-level {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-family: 'Orbitron', monospace;
    font-size: 9px;
    color: var(--c4);
    letter-spacing: 1px;
    text-transform: uppercase;
    background: rgba(178,75,255,.1);
    border: 1px solid rgba(178,75,255,.25);
    border-radius: 20px;
    padding: 3px 10px;
    width: fit-content;
}
.mod-card h3 {
    font-family: 'Orbitron', monospace;
    font-size: 13px;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}
.mod-card p {
    font-size: 13px;
    color: var(--text2);
    line-height: 1.6;
    flex: 1;
    margin: 0;
}
.mod-card-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 16px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--c4), var(--c1));
    color: var(--bg);
    font-size: 12px;
    font-weight: 800;
    text-decoration: none;
    transition: all .2s;
    margin-top: 4px;
    font-family: 'Nunito', sans-serif;
}
.mod-card-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(178,75,255,.4); }

/* Module filter/search bar */
.mod-filter {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.mod-search {
    flex: 1;
    min-width: 200px;
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 16px;
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    outline: none;
    transition: border-color .2s;
}
.mod-search:focus { border-color: var(--c4); box-shadow: 0 0 0 3px rgba(178,75,255,.1); }
.mod-count {
    font-family: 'Orbitron', monospace;
    font-size: 11px;
    color: var(--text3);
    white-space: nowrap;
}

/* Akademi makaleleri (section01 + akademi.php) */
.academy-tag-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: 20px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.28);
    color: var(--c1);
}
.academy-article .academy-h3 {
    font-family: 'Orbitron', monospace;
    font-size: 1rem;
    font-weight: 700;
    color: var(--c1);
    margin: 22px 0 12px;
}
.academy-article .academy-h3:first-child {
    margin-top: 0;
}
.academy-article .academy-p {
    font-size: 15px;
    line-height: 1.85;
    color: var(--text2);
    margin-bottom: 14px;
}
.academy-article .academy-ul {
    margin: 12px 0 16px 22px;
    color: var(--text2);
    line-height: 1.75;
}
.academy-article .academy-ul li {
    margin-bottom: 8px;
}
.academy-article strong {
    color: var(--text);
    font-weight: 700;
}

/* ============================================================
   SANDBOX PAGE
   ============================================================ */
.sandbox-wrap {
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.sandbox-card {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.sandbox-card-head {
    background: var(--bg4);
    padding: 14px 22px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}
.sandbox-card-head h2 {
    font-family: 'Orbitron', monospace;
    font-size: 15px;
    font-weight: 700;
    margin: 0;
    color: var(--c4);
}
.sandbox-card-body { padding: 24px; }

/* JSON’dan gelen HTML görsel yardım (güvenilir proje içeriği) */
.sandbox-visual-html {
    overflow-x: auto;
    border-radius: 10px;
}
.sandbox-visual-html img { max-width: 100%; height: auto; }

.sandbox-result {
    display: none;
    margin-top: 24px;
    padding: 20px;
    border-top: 1px solid var(--border);
    background: rgba(0,255,136,.04);
    border-radius: 0 0 var(--radius) var(--radius);
}
.sandbox-result h3 {
    font-family: 'Orbitron', monospace;
    font-size: 13px;
    color: var(--c3);
    margin-bottom: 12px;
}
.sandbox-output {
    font-family: 'JetBrains Mono', monospace;
    color: #fff;
    white-space: pre-wrap;
    font-size: 1.1rem;
    margin: 0;
    word-break: break-all;
}
.form-row {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    flex-wrap: wrap;
}
.form-group { display: flex; flex-direction: column; gap: 6px; flex: 1; min-width: 160px; }
.form-group label {
    font-size: 11px;
    color: var(--text2);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    font-family: 'Orbitron', monospace;
}
select.form-control {
    background: var(--bg4);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 11px 14px;
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    width: 100%;
    outline: none;
    transition: border-color .2s;
    cursor: pointer;
}
select.form-control:focus { border-color: var(--c4); }
input.form-control {
    background: var(--bg4);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 11px 14px;
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    width: 100%;
    outline: none;
    transition: border-color .2s;
}
input.form-control:focus { border-color: var(--c4); }
textarea.form-control {
    background: var(--bg4);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 11px 14px;
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    width: 100%;
    outline: none;
    transition: border-color .2s;
    min-height: 100px;
    resize: vertical;
}
textarea.form-control:focus { border-color: var(--c4); }

.visual-aid-box {
    background: rgba(0,0,0,.5);
    border: 1px dashed rgba(178,75,255,.4);
    border-radius: var(--radius);
    padding: 20px;
    margin-top: 4px;
    overflow-x: auto;
}
.visual-aid-box h3 {
    font-family: 'Orbitron', monospace;
    font-size: 12px;
    color: var(--c6);
    margin-bottom: 14px;
}

.example-box {
    background: rgba(0,26,20,.7);
    border: 1px solid rgba(0,255,136,.2);
    border-radius: var(--radius);
    padding: 20px 24px;
}
.example-box h2 {
    font-family: 'Orbitron', monospace;
    font-size: 14px;
    color: var(--c3);
    margin-bottom: 14px;
}
.example-line {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--c3);
    margin-bottom: 4px;
}
.example-line.param { color: var(--text2); }
.example-line.result { color: #ff9900; margin-top: 10px; font-size: 14px; }
.example-details {
    margin-top: 16px;
    border-top: 1px dashed rgba(0,255,136,.2);
    padding-top: 14px;
    font-size: 13px;
    color: var(--text);
    white-space: pre-line;
    line-height: 1.7;
}
.example-details h4 {
    font-family: 'Orbitron', monospace;
    font-size: 12px;
    color: var(--c3);
    margin-bottom: 10px;
}

/* ============================================================
   TOOLS PAGE
   ============================================================ */
.tools-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    border-bottom: 2px solid var(--border);
    padding-bottom: 12px;
}
.tab-btn {
    background: var(--bg3);
    border: 1px solid var(--border);
    color: var(--text2);
    padding: 10px 18px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    font-family: 'Nunito', sans-serif;
    transition: all .2s;
}
.tab-btn:hover { border-color: var(--c1); color: var(--c1); }
.tab-btn.active {
    background: linear-gradient(135deg, var(--c1), var(--c4));
    color: var(--bg);
    border-color: transparent;
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.tools-input {
    width: 100%;
    background: var(--bg4);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 16px;
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    outline: none;
    transition: border-color .2s;
    min-height: 90px;
    resize: vertical;
}
.tools-input:focus { border-color: var(--c1); }

.freq-bars-wrap {
    display: flex;
    align-items: flex-end;
    height: 150px;
    border-bottom: 1px solid rgba(255,255,255,.1);
    gap: 5px;
    width: 100%;
    margin-top: 16px;
}
.freq-labels-wrap {
    display: flex;
    gap: 5px;
    margin-top: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--c1);
    font-weight: 700;
}

.encoding-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    margin-top: 16px;
}
.enc-box {
    background: rgba(0,0,0,.3);
    padding: 14px;
    border-radius: 10px;
    border-left: 3px solid var(--c1);
}
.enc-box.hex-box  { border-color: #ff9900; }
.enc-box.b64-box  { border-color: var(--c1); }
.enc-box.asc-box  { border-color: var(--c4); }
.enc-box h4 {
    font-family: 'Orbitron', monospace;
    font-size: 11px;
    margin-bottom: 8px;
}
.enc-val {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text);
    word-break: break-all;
    line-height: 1.6;
}
.key-result {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    color: #fff;
    margin-top: 16px;
    word-break: break-all;
    min-height: 50px;
}
.hash-grid {
    display: grid;
    gap: 12px;
    margin-top: 16px;
}
.hash-row {
    background: rgba(0,0,0,.3);
    padding: 12px 14px;
    border-radius: 10px;
}
.hash-row.md5-row  { border-left: 3px solid #ff3366; }
.hash-row.sha-row  { border-left: 3px solid #00cc66; }
.hash-row h4 {
    font-family: 'Orbitron', monospace;
    font-size: 11px;
    margin-bottom: 6px;
}
.hash-row.md5-row h4 { color: #ff3366; }
.hash-row.sha-row h4 { color: #00cc66; }
.hash-val {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: #ccc;
    word-break: break-all;
}

/* ============================================================
   ENCODING SUB-PAGES (section03_*.php) – KriptoLab themed
   ============================================================ */
.enc-page-hero {
    text-align: center;
    padding: 20px 0 40px;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border);
}
.enc-page-hero .hero-badge { margin-bottom: 14px; }
.enc-page-hero h1 {
    font-family: 'Orbitron', monospace;
    font-size: clamp(28px, 4vw, 48px);
    font-weight: 900;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--c3), var(--c1));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.enc-page-hero p { font-size: 16px; color: var(--text2); max-width: 600px; margin: 0 auto; }

/* Step-style explanation boxes used in encoding pages */
.step-box {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 26px;
    margin: 20px 0;
    position: relative;
}
.step-num {
    position: absolute;
    top: -14px;
    left: 22px;
    background: var(--c3);
    color: var(--bg);
    font-family: 'Orbitron', monospace;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 12px;
    border-radius: 20px;
    letter-spacing: 1px;
}
.step-box h3 {
    font-family: 'Orbitron', monospace;
    font-size: 14px;
    margin-bottom: 10px;
    color: var(--c3);
}

/* Encoding topic cards on section03.php hub */
.enc-topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin: 24px 0;
}
.enc-topic-card {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all .3s;
    position: relative;
    overflow: hidden;
}
.enc-topic-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--c3), transparent);
}
.enc-topic-card:hover {
    border-color: var(--c3);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0,255,136,.12);
}
.enc-topic-card .cat-label {
    font-family: 'Orbitron', monospace;
    font-size: 9px;
    color: var(--c3);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    opacity: .7;
}
.enc-topic-card .icon { font-size: 32px; }
.enc-topic-card h3 {
    font-family: 'Orbitron', monospace;
    font-size: 14px;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}
.enc-topic-card p {
    font-size: 13px;
    color: var(--text2);
    line-height: 1.55;
    margin: 0;
    flex: 1;
}
.enc-topic-card .go {
    font-size: 12px;
    color: var(--c3);
    font-weight: 700;
    margin-top: 4px;
}

/* Bölüm 03 — zincirleme özet (master) geniş kart */
.enc-topic-card.enc-master {
    grid-column: 1 / -1;
    flex-direction: row;
    align-items: center;
    gap: 20px;
    padding: 24px 28px;
    border-top: 3px solid var(--c3);
}
.enc-topic-card.enc-master .icon {
    font-size: 2.5rem;
    flex-shrink: 0;
    margin: 0;
}
.enc-topic-card.enc-master h3 {
    font-size: 16px;
    margin-bottom: 6px;
}
.enc-topic-card.enc-master .go {
    margin-top: 0;
    flex-shrink: 0;
}
@media (max-width: 600px) {
    .enc-topic-card.enc-master {
        flex-direction: column;
        text-align: center;
    }
}

/* Bölüm 03 hub — kart başına vurgu rengi (--accent inline) */
.page-wrap[data-section="3"] .enc-topic-grid > .enc-topic-card::before {
    background: linear-gradient(90deg, var(--accent, var(--c3)), transparent);
}
.page-wrap[data-section="3"] .enc-topic-grid > .enc-topic-card:hover {
    border-color: color-mix(in srgb, var(--accent, var(--c3)) 50%, var(--border));
    box-shadow: 0 12px 32px color-mix(in srgb, var(--accent, var(--c3)) 14%, transparent);
}
.page-wrap[data-section="3"] .enc-topic-grid > .enc-topic-card .cat-label {
    color: var(--accent, var(--c3));
    opacity: 0.95;
}
.page-wrap[data-section="3"] .enc-topic-grid > .enc-topic-card .go {
    color: var(--accent, var(--c3));
}

/* ============================================================
   GELİŞMİŞ KAVRAMLAR (gelismis_kavramlar.php) + concepts
   ============================================================ */
.page-gelismis {
    --gc-accent: #d4a017;
    --gc-accent2: #f4d03f;
}
.page-gelismis .gelismis-hero {
    color: var(--gc-accent);
}
.page-gelismis .gelismis-num {
    font-size: clamp(36px, 8vw, 52px);
    line-height: 1;
    opacity: 0.95;
    background: linear-gradient(135deg, var(--gc-accent2), var(--gc-accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 24px rgba(212, 160, 23, 0.25));
}
.page-gelismis .pg-section-title h1 {
    background: linear-gradient(135deg, #fff 0%, var(--gc-accent2) 55%, var(--gc-accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.concepts-section { margin-bottom: 44px; }
.concepts-section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    font-family: 'Orbitron', monospace;
    font-size: clamp(14px, 2.5vw, 17px);
    font-weight: 700;
    color: var(--gc-accent);
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 1px solid rgba(212, 160, 23, 0.25);
}
.concepts-count-badge {
    font-family: 'Orbitron', monospace;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--text3);
    background: rgba(212, 160, 23, 0.1);
    border: 1px solid rgba(212, 160, 23, 0.3);
    padding: 4px 10px;
    border-radius: 20px;
}
.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}
.concept-card {
    position: relative;
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 20px 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}
.concept-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gc-accent), var(--gc-accent2), transparent);
    opacity: 0.85;
}
.concept-card:hover {
    border-color: rgba(212, 160, 23, 0.45);
    transform: translateY(-4px);
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.35);
}
.concept-card-lvl {
    position: absolute;
    top: 14px;
    right: 14px;
    font-family: 'Orbitron', monospace;
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--text3);
    background: var(--bg4);
    border: 1px solid var(--border);
    padding: 3px 8px;
    border-radius: 20px;
}
.concept-card h3 {
    font-family: 'Orbitron', monospace;
    font-size: 13px;
    font-weight: 700;
    color: var(--text);
    margin: 0;
    padding-right: 48px;
}
.concept-card p {
    font-size: 13px;
    color: var(--text2);
    line-height: 1.65;
    margin: 0;
    flex: 1;
}
a.concept-card-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 6px;
    padding: 10px 14px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 800;
    text-decoration: none;
    font-family: 'Nunito', sans-serif;
    color: var(--bg);
    background: linear-gradient(135deg, var(--gc-accent), #b8860b);
    border: 1px solid rgba(212, 160, 23, 0.5);
    transition: transform 0.2s, box-shadow 0.2s;
}
a.concept-card-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(212, 160, 23, 0.35);
    color: var(--bg);
}
.gelismis-filter {
    margin-bottom: 28px;
}
.gelismis-empty {
    text-align: center;
    padding: 56px 24px;
    background: var(--bg3);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    color: var(--text3);
}
.gelismis-empty-icon {
    font-size: 48px;
    margin-bottom: 12px;
}
.gelismis-empty h2 {
    font-family: 'Orbitron', monospace;
    font-size: 18px;
    color: var(--text2);
    margin-bottom: 8px;
}

/* ============================================================
   RESPONSIVE ADDITIONS
   ============================================================ */
@media (max-width:768px) {
    .page-wrap { padding: 90px 16px 60px; }
    .modules-grid { grid-template-columns: 1fr; }
    .form-row { flex-direction: column; }
    .encoding-grid { grid-template-columns: 1fr; }
    .enc-topic-grid { grid-template-columns: repeat(2, 1fr); }
    .tools-tabs { flex-direction: column; }
    .rsa-visual { flex-direction: column; align-items: stretch; }
    .rsa-arrow { text-align: center; }
    .converter-grid { grid-template-columns: 1fr; }
    .sandbox-card-head { padding: 12px 16px; }
    .sandbox-card-body { padding: 16px; }
}
@media (max-width:500px) {
    .enc-topic-grid { grid-template-columns: 1fr; }
    .concept-grid { grid-template-columns: 1fr; }
    .pg-section-num { display: none; }
}

/* ============================================================
   TOOLS PAGE — TABS
   ============================================================ */
.tools-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
    padding: 6px;
    background: var(--bg3);
    border-radius: 14px;
    border: 1px solid var(--border);
}
.tab-btn {
    flex: 1;
    min-width: 120px;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-radius: 10px;
    color: var(--text2);
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: all .25s;
}
.tab-btn:hover { background: var(--bg4); color: var(--text); }
.tab-btn.active { background: linear-gradient(135deg,rgba(0,212,255,.15),rgba(0,212,255,.05)); color: #00e5ff; border: 1px solid rgba(0,212,255,.3); }

.tab-panel { display: none; animation: fadeIn .3s; }
.tab-panel.active { display: block; }

/* ============================================================
   ENCODING PAGE HERO
   ============================================================ */
.enc-page-hero {
    text-align: center;
    padding: 40px 20px 32px;
    margin-bottom: 32px;
}
.enc-page-hero .hero-badge {
    background: linear-gradient(135deg,rgba(0,212,255,.15),rgba(178,75,255,.15));
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 6px 16px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text2);
    margin-bottom: 16px;
}
.enc-page-hero h1 {
    font-family: 'Orbitron', monospace;
    font-size: clamp(28px, 5vw, 48px);
    font-weight: 900;
    margin-bottom: 12px;
}
.enc-page-hero p { color: var(--text2); font-size: 16px; max-width: 600px; margin: 0 auto; }

/* ============================================================
   STEP BOXES
   ============================================================ */
.step-box {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 28px;
    margin-bottom: 16px;
    position: relative;
    border-left: 3px solid var(--c3);
}
.step-box .step-num {
    display: inline-block;
    font-family: 'Orbitron', monospace;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--c3);
    background: rgba(0,255,136,.1);
    padding: 3px 10px;
    border-radius: 6px;
    margin-bottom: 12px;
}
.step-box h3 {
    font-family: 'Orbitron', monospace;
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
}
.step-box code {
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg4);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    color: var(--c1);
}

/* ============================================================
   SANDBOX PAGE
   ============================================================ */
.sandbox-wrap {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.sandbox-card {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color .25s;
}
.sandbox-card:hover { border-color: rgba(0,212,255,.3); }
.sandbox-card-head {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: var(--bg4);
    border-bottom: 1px solid var(--border);
}
.sandbox-card-head h2 {
    font-family: 'Orbitron', monospace;
    font-size: 14px;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}
.sandbox-card-body { padding: 24px; }

.example-box { background: var(--bg4); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.example-box h2 { font-family: 'Orbitron', monospace; font-size: 13px; color: var(--c1); margin-bottom: 14px; }
.example-line { font-family: 'JetBrains Mono', monospace; font-size: 14px; color: var(--text2); margin-bottom: 6px; }
.example-line.param { color: var(--text3); font-size: 12px; }
.example-line.result { color: var(--c3); font-weight: 700; margin-top: 8px; }
.example-details { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border); font-size: 13px; color: var(--text2); }
.example-details h4 { color: var(--c6); font-size: 12px; margin-bottom: 8px; }

.visual-aid-box { background: var(--bg); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.visual-aid-box h3 { font-family: 'Orbitron', monospace; font-size: 12px; color: var(--c4); margin-bottom: 12px; }

.sandbox-result { background: var(--bg4); border: 1px solid rgba(0,255,136,.3); border-radius: 12px; padding: 20px; margin-top: 16px; }
.sandbox-result h3 { font-family: 'Orbitron', monospace; font-size: 12px; color: var(--c3); margin-bottom: 10px; }
.sandbox-output { font-family: 'JetBrains Mono', monospace; font-size: 14px; color: var(--text); white-space: pre-wrap; word-break: break-all; }

/* ============================================================
   TOOLS SPECIFIC
   ============================================================ */
.tools-input {
    width: 100%;
    min-height: 80px;
    background: var(--bg4);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 16px;
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    resize: vertical;
    outline: none;
    transition: border-color .2s;
}
.tools-input:focus { border-color: rgba(0,212,255,.4); }

.freq-bars-wrap { display: flex; align-items: flex-end; gap: 3px; min-height: 140px; padding: 10px; background: var(--bg); border-radius: 10px; border: 1px solid var(--border); }
.freq-labels-wrap { display: flex; gap: 3px; padding: 4px 10px; color: var(--text3); font-family: 'JetBrains Mono', monospace; }

.encoding-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.enc-box { background: var(--bg4); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; }
.enc-box h4 { font-size: 11px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 8px; }
.enc-val { font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--text2); word-break: break-all; }

.key-result { font-family: 'JetBrains Mono', monospace; font-size: 14px; color: var(--c3); background: var(--bg4); border: 1px solid rgba(0,255,136,.2); border-radius: 10px; padding: 14px 16px; word-break: break-all; margin-top: 16px; min-height: 50px; }

.hash-grid { display: grid; gap: 12px; margin-top: 12px; }
.hash-row { background: var(--bg4); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; }
.md5-row { border-color: rgba(255,71,87,.2); }
.sha-row { border-color: rgba(0,255,136,.2); }
.hash-row h4 { font-size: 11px; color: var(--text3); margin-bottom: 8px; }
.hash-val { font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--text); word-break: break-all; }

/* ============================================================
   SANDBOX FORM ELEMENTS
   ============================================================ */
.form-row { display: flex; gap: 16px; flex-wrap: wrap; }
.form-group { flex: 1; min-width: 180px; display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 12px; color: var(--text2); font-weight: 700; text-transform: uppercase; letter-spacing: 1px; }
.form-control {
    background: var(--bg4);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 14px;
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    outline: none;
    width: 100%;
    transition: border-color .2s;
}
.form-control:focus { border-color: rgba(0,212,255,.5); }
textarea.form-control { resize: vertical; min-height: 80px; }

/* Parity bits */
.parity-bits { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.parity-result { padding: 12px 16px; border-radius: 10px; font-family: 'JetBrains Mono'; font-size: 14px; text-align: center; }
.parity-ok { background: rgba(0,255,136,.1); border: 1px solid rgba(0,255,136,.3); color: var(--c3); }
.parity-err { background: rgba(255,71,87,.1); border: 1px solid rgba(255,71,87,.3); color: var(--c5); }

/* RSA visual */
.rsa-visual { display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap; margin: 24px 0; }
.rsa-box { background: var(--bg3); border-radius: 16px; padding: 24px 28px; text-align: center; flex: 1; min-width: 150px; max-width: 220px; }
.rsa-arrow { font-size: 32px; color: var(--text3); }

/* Hash visual */
.hash-visual { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin: 24px 0; }
.hash-input-box, .hash-output-box { flex: 1; min-width: 160px; background: var(--bg3); border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; }
.hash-arrow { font-size: 32px; color: var(--c5); flex-shrink: 0; }
#hash-vis-in, #hash-vis-out { font-family: 'JetBrains Mono', monospace; font-size: 13px; word-break: break-all; }

/* Brute force output rows */
#bf-output { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }

/* Freq chart */
.freq-chart { display: flex; align-items: flex-end; gap: 3px; min-height: 120px; padding: 10px; background: var(--bg); border-radius: 10px; border: 1px solid var(--border); margin-top: 14px; }
.freq-chart div { border-radius: 2px 2px 0 0; }

/* Module level badge */
.mod-card-level {
    display: inline-block;
    font-family: 'Orbitron', monospace;
    font-size: 10px;
    font-weight: 700;
    padding: 3px 10px;
    background: rgba(0,212,255,.1);
    border: 1px solid rgba(0,212,255,.2);
    border-radius: 6px;
    color: var(--c1);
    margin-bottom: 10px;
}

/* Module search bar */
.mod-filter {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 20px;
}
.mod-search {
    flex: 1;
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 16px;
    color: var(--text);
    font-family: 'Nunito', sans-serif;
    font-size: 15px;
    outline: none;
    transition: border-color .2s;
}
.mod-search:focus { border-color: rgba(0,212,255,.4); }
.mod-count { font-family: 'Orbitron', monospace; font-size: 12px; color: var(--text3); flex-shrink: 0; }

/* Converter grid row */
.converter-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 16px;
}
.converter-grid input { background: var(--bg4); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; color: var(--text); font-family: 'JetBrains Mono', monospace; font-size: 16px; outline: none; width: 100%; transition: border-color .2s; }
.converter-grid input:focus { border-color: rgba(0,212,255,.4); }
.conv-label { display: block; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 6px; }

/* Encoding topic grid cards */
.enc-topic-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 28px;
}
.enc-topic-card {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 20px;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    gap: 8px;
    position: relative;
    overflow: hidden;
    transition: all .25s;
}
.enc-topic-card::before {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(135deg,rgba(0,212,255,.04),transparent);
    opacity: 0;
    transition: opacity .25s;
}
.enc-topic-card:hover { border-color: rgba(0,212,255,.4); transform: translateY(-3px); box-shadow: 0 12px 40px rgba(0,0,0,.3); }
.enc-topic-card:hover::before { opacity: 1; }
.enc-topic-card .cat-label { font-size: 10px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--text3); }
.enc-topic-card .icon { font-size: 2rem; }
.enc-topic-card h3 { font-family: 'Orbitron', monospace; font-size: 14px; font-weight: 700; color: var(--text); margin: 0; }
.enc-topic-card p { font-size: 13px; color: var(--text2); line-height: 1.6; margin: 0; flex: 1; }
.enc-topic-card .go { font-size: 12px; font-weight: 700; color: var(--c3); margin-top: auto; }