/* ========== RESET & BASE ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --sidebar-w: 280px;
    --font: 'Inter', system-ui, sans-serif;
    --mono: 'JetBrains Mono', monospace;
}

/* ========== DARK THEME (default) ========== */
[data-theme="dark"], :root {
    --bg: #0a0e17;
    --bg2: #111827;
    --bg3: #1e293b;
    --surface: #1e293b;
    --surface2: #334155;
    --text: #e2e8f0;
    --text2: #94a3b8;
    --accent: #38bdf8;
    --accent2: #818cf8;
    --accent3: #a78bfa;
    --green: #34d399;
    --red: #f87171;
    --orange: #fb923c;
    --yellow: #fbbf24;
    --pink: #f472b6;
    --code-bg: #0d1117;
    --code-text: #c9d1d9;
    --card-hover-shadow: rgba(0,0,0,0.3);
    --hero-card-glow: rgba(56,189,248,0.1);
}

/* ========== LIGHT THEME ========== */
[data-theme="light"] {
    --bg: #f8fafc;
    --bg2: #f1f5f9;
    --bg3: #e2e8f0;
    --surface: #ffffff;
    --surface2: #cbd5e1;
    --text: #1e293b;
    --text2: #475569;
    --accent: #0284c7;
    --accent2: #6366f1;
    --accent3: #7c3aed;
    --green: #059669;
    --red: #dc2626;
    --orange: #ea580c;
    --yellow: #ca8a04;
    --pink: #db2777;
    --code-bg: #f1f5f9;
    --code-text: #334155;
    --card-hover-shadow: rgba(0,0,0,0.08);
    --hero-card-glow: rgba(2,132,199,0.08);
}

html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    display: flex;
    min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--surface2); border-radius: 3px; }

/* ========== SIDEBAR ========== */
#sidebar {
    width: var(--sidebar-w);
    min-width: var(--sidebar-w);
    height: 100vh;
    position: fixed;
    top: 0; left: 0;
    background: var(--bg2);
    border-right: 1px solid var(--surface2);
    overflow-y: auto;
    z-index: 100;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 24px 20px 16px;
    border-bottom: 1px solid var(--surface2);
}
.sidebar-header h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}
.sidebar-header .accent { color: var(--accent); }
.sidebar-header .subtitle { font-size: 0.75rem; color: var(--text2); margin-top: 2px; }

#nav-menu { list-style: none; padding: 8px 0; }
#nav-menu li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    color: var(--text2);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}
#nav-menu li a:hover {
    color: var(--text);
    background: rgba(56,189,248,0.05);
    text-decoration: none;
}
#nav-menu li a.active {
    color: var(--accent);
    background: rgba(56,189,248,0.1);
    border-left-color: var(--accent);
}
.nav-icon { font-size: 1rem; width: 24px; text-align: center; }
.nav-group-title {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text2);
    padding: 16px 20px 6px;
    opacity: 0.6;
}

#sidebar-toggle {
    display: none;
    position: fixed;
    top: 12px; left: 12px;
    z-index: 200;
    background: var(--surface);
    border: 1px solid var(--surface2);
    color: var(--text);
    font-size: 1.3rem;
    padding: 6px 10px;
    border-radius: 8px;
    cursor: pointer;
}

/* ========== MAIN CONTENT ========== */
#main-wrap {
    margin-left: var(--sidebar-w);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-width: 0;
}
#content {
    flex: 1;
    padding: 40px 48px;
    max-width: 1100px;
    width: 100%;
}

/* ========== TYPOGRAPHY ========== */
.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-subtitle {
    font-size: 1.1rem;
    color: var(--text2);
    margin-bottom: 32px;
}
h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin: 40px 0 16px;
    color: var(--text);
}
h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 28px 0 12px;
    color: var(--accent);
}
h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 20px 0 8px;
    color: var(--accent3);
}
p { margin-bottom: 16px; color: var(--text2); }
ul, ol { margin: 0 0 16px 24px; color: var(--text2); }
li { margin-bottom: 6px; }
strong { color: var(--text); font-weight: 600; }

/* ========== CARDS & BOXES ========== */
.card {
    background: var(--surface);
    border: 1px solid var(--surface2);
    border-radius: 12px;
    padding: 24px;
    margin: 16px 0;
    transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--card-hover-shadow);
}
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
    margin: 16px 0;
}
.card-grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    margin: 16px 0;
}

.info-box {
    background: rgba(56,189,248,0.08);
    border-left: 4px solid var(--accent);
    padding: 16px 20px;
    border-radius: 0 8px 8px 0;
    margin: 16px 0;
}
.warn-box {
    background: rgba(251,191,36,0.08);
    border-left: 4px solid var(--yellow);
    padding: 16px 20px;
    border-radius: 0 8px 8px 0;
    margin: 16px 0;
}
.success-box {
    background: rgba(52,211,153,0.08);
    border-left: 4px solid var(--green);
    padding: 16px 20px;
    border-radius: 0 8px 8px 0;
    margin: 16px 0;
}

/* ========== CODE BLOCKS ========== */
.code-block {
    background: var(--code-bg);
    border: 1px solid var(--surface2);
    border-radius: 8px;
    padding: 16px 20px;
    font-family: var(--mono);
    font-size: 0.82rem;
    line-height: 1.6;
    overflow-x: auto;
    margin: 12px 0;
    white-space: pre;
    color: var(--code-text);
}
.code-block .kw { color: #ff7b72; }
.code-block .fn { color: #d2a8ff; }
.code-block .str { color: #a5d6ff; }
.code-block .cm { color: #8b949e; }
.code-block .num { color: #79c0ff; }
.code-block .type { color: #ffa657; }
code {
    font-family: var(--mono);
    background: var(--bg3);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
    color: var(--accent);
}

/* ========== TABS ========== */
.tabs {
    display: flex;
    gap: 4px;
    margin: 20px 0 0;
    border-bottom: 2px solid var(--surface2);
    flex-wrap: wrap;
}
.tab-btn {
    padding: 10px 20px;
    background: none;
    border: none;
    color: var(--text2);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}
.tab-content {
    display: none;
    padding: 20px 0;
    animation: fadeIn 0.3s ease;
}
.tab-content.active { display: block; }

/* ========== ANIMATION CANVAS ========== */
.anim-container {
    background: var(--bg);
    border: 1px solid var(--surface2);
    border-radius: 12px;
    margin: 16px 0;
    overflow: hidden;
    position: relative;
}
.anim-container canvas {
    width: 100%;
    display: block;
}
.anim-controls {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    background: var(--surface);
    border-top: 1px solid var(--surface2);
    flex-wrap: wrap;
}
.anim-btn {
    padding: 6px 16px;
    background: var(--accent);
    color: var(--bg);
    border: none;
    border-radius: 6px;
    font-family: var(--font);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}
.anim-btn:hover { opacity: 0.85; }
.anim-btn.secondary {
    background: var(--surface2);
    color: var(--text);
}
.anim-label {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text2);
    font-size: 0.8rem;
}
.anim-input {
    background: var(--bg);
    border: 1px solid var(--surface2);
    color: var(--text);
    padding: 4px 10px;
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.8rem;
    width: 120px;
}

/* ========== TABLE ========== */
.table-wrapper { overflow-x: auto; margin: 16px 0; }
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}
th {
    background: var(--surface);
    color: var(--accent);
    font-weight: 600;
    text-align: left;
    padding: 12px 16px;
    border-bottom: 2px solid var(--surface2);
    white-space: nowrap;
}
td {
    padding: 10px 16px;
    border-bottom: 1px solid rgba(51,65,85,0.5);
    color: var(--text2);
}
tr:hover td { background: rgba(56,189,248,0.03); }

/* ========== BADGES ========== */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.badge-blue { background: rgba(56,189,248,0.15); color: var(--accent); }
.badge-green { background: rgba(52,211,153,0.15); color: var(--green); }
.badge-red { background: rgba(248,113,113,0.15); color: var(--red); }
.badge-orange { background: rgba(251,146,60,0.15); color: var(--orange); }
.badge-purple { background: rgba(167,139,250,0.15); color: var(--accent3); }
.badge-yellow { background: rgba(251,191,36,0.15); color: var(--yellow); }
.badge-pink { background: rgba(244,114,182,0.15); color: var(--pink); }

/* ========== FLOW / DIAGRAM ========== */
.flow-diagram {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px;
    overflow-x: auto;
    margin: 16px 0;
    flex-wrap: wrap;
    justify-content: center;
}
.flow-node {
    background: var(--surface);
    border: 2px solid var(--accent);
    border-radius: 10px;
    padding: 12px 20px;
    text-align: center;
    min-width: 100px;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.3s;
}
.flow-node:hover { background: rgba(56,189,248,0.1); transform: scale(1.05); }
.flow-node.highlight { border-color: var(--green); background: rgba(52,211,153,0.1); }
.flow-arrow { color: var(--accent); font-size: 1.2rem; font-weight: 700; }

/* ========== COMPARISON COLUMNS ========== */
.vs-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 20px;
    align-items: start;
    margin: 20px 0;
}
.vs-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
    padding-top: 40px;
}

/* ========== STEP ANIMATION ========== */
.step-list { counter-reset: step; }
.step-item {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    opacity: 0;
    transform: translateX(-20px);
    animation: slideIn 0.4s ease forwards;
}
.step-item:nth-child(1) { animation-delay: 0.1s; }
.step-item:nth-child(2) { animation-delay: 0.2s; }
.step-item:nth-child(3) { animation-delay: 0.3s; }
.step-item:nth-child(4) { animation-delay: 0.4s; }
.step-item:nth-child(5) { animation-delay: 0.5s; }
.step-item:nth-child(6) { animation-delay: 0.6s; }
.step-num {
    flex-shrink: 0;
    width: 32px; height: 32px;
    background: var(--accent);
    color: var(--bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
}
.step-text { flex: 1; }

/* ========== PROGRESS BAR ========== */
.progress-bar {
    height: 8px;
    background: var(--surface);
    border-radius: 4px;
    overflow: hidden;
    margin: 8px 0;
}
.progress-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 1s ease;
}

/* ========== ANIMATIONS ========== */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideIn { to { opacity: 1; transform: translateX(0); } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
@keyframes glow {
    0%, 100% { box-shadow: 0 0 5px rgba(56,189,248,0.3); }
    50% { box-shadow: 0 0 20px rgba(56,189,248,0.6); }
}
@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}
@keyframes blink { 0%, 100% { border-color: var(--accent); } 50% { border-color: transparent; } }

.animate-in {
    opacity: 0;
    transform: translateY(20px);
    animation: slideUp 0.5s ease forwards;
}
.animate-in:nth-child(2) { animation-delay: 0.1s; }
.animate-in:nth-child(3) { animation-delay: 0.2s; }
.animate-in:nth-child(4) { animation-delay: 0.3s; }

.glow { animation: glow 2s ease-in-out infinite; }
.pulse { animation: pulse 2s ease-in-out infinite; }

/* ========== HERO ========== */
.hero {
    text-align: center;
    padding: 60px 0 40px;
}
.hero h1 {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -2px;
    background: linear-gradient(135deg, var(--accent), var(--accent2), var(--accent3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}
.hero p {
    font-size: 1.15rem;
    color: var(--text2);
    max-width: 600px;
    margin: 0 auto 32px;
}
.hero-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
    margin-top: 32px;
}
.hero-card {
    background: var(--surface);
    border: 1px solid var(--surface2);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s;
}
.hero-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px var(--hero-card-glow);
}
.hero-card .icon { font-size: 2rem; margin-bottom: 8px; }
.hero-card h3 {
    font-size: 0.9rem;
    margin: 0 0 4px;
    color: var(--text);
}
.hero-card p { font-size: 0.75rem; color: var(--text2); margin: 0; }

/* ========== SVG AUTOMATA ========== */
.automata-svg {
    width: 100%;
    max-width: 700px;
    margin: 20px auto;
    display: block;
}
.automata-svg .state {
    fill: var(--surface);
    stroke: var(--accent);
    stroke-width: 2;
    transition: fill 0.3s;
}
.automata-svg .state.active { fill: rgba(56,189,248,0.2); }
.automata-svg .state.accept {
    stroke: var(--green);
    stroke-width: 3;
}
.automata-svg .transition-line {
    stroke: var(--text2);
    stroke-width: 1.5;
    fill: none;
}
.automata-svg .transition-label {
    fill: var(--accent);
    font-family: var(--mono);
    font-size: 14px;
}
.automata-svg .state-label {
    fill: var(--text);
    font-family: var(--font);
    font-size: 14px;
    font-weight: 600;
    text-anchor: middle;
    dominant-baseline: central;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1200px) {
    .hero-cards { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}
@media (max-width: 900px) {
    #sidebar { transform: translateX(-100%); }
    #sidebar.open { transform: translateX(0); }
    #sidebar-toggle { display: block; }
    #main-wrap { margin-left: 0; }
    #content { padding: 20px; }
    .section-title { font-size: 1.8rem; }
    .hero h1 { font-size: 2.2rem; }
    .card-grid { grid-template-columns: 1fr; }
    .vs-container { grid-template-columns: 1fr; }
    .vs-divider { padding-top: 0; }
    .hero-cards { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
    .pipeline { flex-wrap: wrap; }
    .pipeline-stage { min-width: 100px; }
    .thread-vis { flex-wrap: wrap; }
    .comparison-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
    #content { padding: 16px; }
    .hero h1 { font-size: 1.8rem; }
    .tabs { gap: 2px; }
    .tab-btn { padding: 8px 12px; font-size: 0.75rem; }
    .card { padding: 16px; }
    .hero-cards { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 8px; }
    .hero-card { padding: 14px; }
    .hero-card .icon { font-size: 1.5rem; }
    .hero-card h3 { font-size: 0.8rem; }
    .flow-diagram { gap: 8px; }
}

/* ========== TREE VISUALIZATION ========== */
.tree-vis {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px;
}
.tree-level {
    display: flex;
    gap: 16px;
    justify-content: center;
}
.tree-node {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--surface);
    border: 2px solid var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    transition: all 0.3s;
}
.tree-node:hover {
    background: rgba(56,189,248,0.2);
    transform: scale(1.1);
}

/* ========== ENCRYPTION VIS ========== */
.encrypt-vis {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: var(--surface);
    border-radius: 12px;
    margin: 16px 0;
    flex-wrap: wrap;
    justify-content: center;
}
.encrypt-block {
    background: var(--bg);
    border: 1px solid var(--surface2);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
    min-width: 120px;
}
.encrypt-block.key { border-color: var(--yellow); }
.encrypt-block.cipher { border-color: var(--green); }
.encrypt-arrow { font-size: 1.5rem; color: var(--accent); }

/* ========== TIMELINE ========== */
.timeline {
    position: relative;
    padding-left: 30px;
    margin: 20px 0;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--surface2);
}
.timeline-item {
    position: relative;
    margin-bottom: 24px;
    padding-left: 20px;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -26px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg);
}
.timeline-item h4 { margin-top: 0; }

/* ========== PARALLEL / THREAD VIS ========== */
.thread-vis {
    display: flex;
    gap: 8px;
    padding: 20px;
    background: var(--surface);
    border-radius: 12px;
    margin: 16px 0;
    overflow-x: auto;
    align-items: flex-end;
}
.thread-lane {
    flex: 1;
    min-width: 80px;
    background: var(--bg);
    border: 1px solid var(--surface2);
    border-radius: 8px;
    padding: 8px;
    text-align: center;
    font-size: 0.75rem;
}
.thread-lane .lane-title {
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 8px;
    font-size: 0.7rem;
    text-transform: uppercase;
}
.thread-block {
    padding: 6px;
    margin: 4px 0;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    animation: slideUp 0.3s ease forwards;
}
.thread-block.compute { background: rgba(56,189,248,0.2); color: var(--accent); border: 1px solid var(--accent); }
.thread-block.io { background: rgba(251,191,36,0.2); color: var(--yellow); border: 1px solid var(--yellow); }
.thread-block.sync { background: rgba(248,113,113,0.2); color: var(--red); border: 1px solid var(--red); }
.thread-block.idle { background: rgba(71,85,105,0.3); color: var(--text2); border: 1px dashed var(--surface2); }

/* ========== PROTOCOL PACKET VIS ========== */
.packet-vis {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    margin: 16px 0;
    position: relative;
    overflow: hidden;
}
.packet-flow {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 12px 0;
    position: relative;
}
.packet-endpoint {
    background: var(--bg);
    border: 2px solid var(--accent);
    border-radius: 8px;
    padding: 12px 16px;
    text-align: center;
    min-width: 90px;
    font-weight: 700;
    font-size: 0.8rem;
    z-index: 2;
}
.packet-line {
    flex: 1;
    height: 2px;
    background: var(--surface2);
    position: relative;
    margin: 0 -4px;
}
.packet-msg {
    position: absolute;
    top: -24px;
    background: rgba(56,189,248,0.15);
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
    white-space: nowrap;
    animation: packetMove 2s ease-in-out infinite;
}
@keyframes packetMove {
    0% { left: 0; opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { left: calc(100% - 60px); opacity: 0; }
}

/* ========== LAYER DIAGRAM ========== */
.layer-diagram {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin: 16px 0;
}
.layer-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    transition: all 0.3s;
    cursor: default;
}
.layer-item:hover { transform: translateX(8px); }
.layer-num {
    width: 28px; height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.75rem;
    flex-shrink: 0;
}
.layer-info { flex: 1; }
.layer-info strong { display: block; font-size: 0.85rem; }
.layer-info span { font-size: 0.75rem; color: var(--text2); }

/* ========== GPU GRID VIS ========== */
.gpu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(24px, 1fr));
    gap: 3px;
    padding: 16px;
    background: var(--surface);
    border-radius: 12px;
    margin: 16px 0;
}
.gpu-core {
    aspect-ratio: 1;
    border-radius: 3px;
    transition: all 0.15s;
    cursor: default;
}
.gpu-core.active { background: var(--accent); animation: pulse 1s ease-in-out infinite; }
.gpu-core.idle { background: var(--surface2); }
.gpu-core:hover { transform: scale(1.3); z-index: 1; }

/* ========== COMPARISON TABLE ENHANCED ========== */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin: 16px 0;
}
.lang-card {
    background: var(--surface);
    border: 1px solid var(--surface2);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s;
}
.lang-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}
.lang-card .lang-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
.lang-card .lang-icon { font-size: 1.5rem; }
.lang-card .lang-name { font-weight: 700; font-size: 1.1rem; }

/* ========== MEMORY LAYOUT VIS ========== */
.mem-layout {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin: 16px 0;
    font-family: var(--mono);
    font-size: 0.75rem;
}
.mem-row {
    display: flex;
    align-items: center;
    gap: 8px;
}
.mem-addr {
    color: var(--text2);
    min-width: 80px;
    text-align: right;
}
.mem-cell {
    flex: 1;
    padding: 6px 12px;
    border-radius: 4px;
    font-weight: 600;
    text-align: center;
}
.mem-cell.stack { background: rgba(56,189,248,0.15); color: var(--accent); border: 1px solid var(--accent); }
.mem-cell.heap { background: rgba(167,139,250,0.15); color: var(--accent3); border: 1px solid var(--accent3); }
.mem-cell.data { background: rgba(52,211,153,0.15); color: var(--green); border: 1px solid var(--green); }
.mem-cell.text-seg { background: rgba(251,191,36,0.15); color: var(--yellow); border: 1px solid var(--yellow); }

/* ========== NEURAL NETWORK VIS ========== */
.nn-container {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    margin: 16px 0;
    text-align: center;
}

/* ========== PIPELINE VIS ========== */
.pipeline {
    display: flex;
    gap: 0;
    margin: 16px 0;
    overflow-x: auto;
}
.pipeline-stage {
    flex: 1;
    min-width: 120px;
    padding: 16px;
    text-align: center;
    position: relative;
    background: var(--surface);
    border: 1px solid var(--surface2);
}
.pipeline-stage:first-child { border-radius: 12px 0 0 12px; }
.pipeline-stage:last-child { border-radius: 0 12px 12px 0; }
.pipeline-stage::after {
    content: '';
    position: absolute;
    right: -8px;
    top: 50%;
    transform: translateY(-50%);
    width: 0; height: 0;
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
    border-left: 8px solid var(--accent);
    z-index: 1;
}
.pipeline-stage:last-child::after { display: none; }
.pipeline-stage .stage-title {
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 4px;
}
.pipeline-stage .stage-desc {
    font-size: 0.7rem;
    color: var(--text2);
}

/* ========== HANDSHAKE VIS ========== */
.handshake-vis {
    position: relative;
    padding: 20px;
    margin: 16px 0;
}
.handshake-col {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0;
}
.handshake-label {
    font-weight: 700;
    font-size: 0.85rem;
    text-align: center;
    padding: 8px 16px;
    background: var(--surface);
    border: 2px solid var(--accent);
    border-radius: 8px;
    min-width: 100px;
}
.handshake-msgs {
    position: relative;
    margin: 0 50px;
    padding: 8px 0;
}
.hs-msg {
    display: flex;
    align-items: center;
    margin: 8px 0;
    gap: 8px;
    font-size: 0.78rem;
    opacity: 0;
    animation: slideIn 0.4s ease forwards;
}
.hs-msg:nth-child(1) { animation-delay: 0.1s; }
.hs-msg:nth-child(2) { animation-delay: 0.3s; }
.hs-msg:nth-child(3) { animation-delay: 0.5s; }
.hs-msg:nth-child(4) { animation-delay: 0.7s; }
.hs-msg:nth-child(5) { animation-delay: 0.9s; }
.hs-msg:nth-child(6) { animation-delay: 1.1s; }
.hs-msg:nth-child(7) { animation-delay: 1.3s; }
.hs-msg:nth-child(8) { animation-delay: 1.5s; }
.hs-msg:nth-child(9) { animation-delay: 1.7s; }
.hs-msg:nth-child(10) { animation-delay: 1.9s; }
.hs-msg .hs-arrow {
    flex: 1;
    height: 2px;
    background: var(--accent);
    position: relative;
}
.hs-msg .hs-arrow::after {
    content: '';
    position: absolute;
    right: 0; top: -4px;
    border-left: 8px solid var(--accent);
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
}
.hs-msg.reverse .hs-arrow {
    background: var(--green);
}
.hs-msg.reverse .hs-arrow::after {
    right: auto; left: 0;
    border-left: none;
    border-right: 8px solid var(--green);
}
.hs-msg .hs-text {
    font-weight: 600;
    min-width: 140px;
    padding: 4px 10px;
    background: rgba(56,189,248,0.1);
    border-radius: 4px;
    color: var(--accent);
    text-align: center;
}
.hs-msg.reverse .hs-text {
    background: rgba(52,211,153,0.1);
    color: var(--green);
}

/* ========== EXTRA ANIMATION ========== */
@keyframes flowRight {
    0% { transform: translateX(-20px); opacity: 0; }
    50% { opacity: 1; }
    100% { transform: translateX(20px); opacity: 0; }
}
@keyframes scaleIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
.scale-in { animation: scaleIn 0.4s ease forwards; }
.flow-right { animation: flowRight 1.5s ease-in-out infinite; }

/* ========== THEME TOGGLE ========== */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    cursor: pointer;
    color: var(--text2);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
    border: none;
    background: none;
    font-family: var(--font);
    width: 100%;
    text-align: left;
}
.theme-toggle:hover {
    color: var(--text);
    background: rgba(56,189,248,0.05);
}
.theme-toggle-icon {
    font-size: 1rem;
    width: 24px;
    text-align: center;
    transition: transform 0.3s;
}
.theme-toggle:hover .theme-toggle-icon {
    transform: rotate(30deg);
}

/* ========== LANGUAGE TOGGLE ========== */
[data-lang="id"] .lang-en { display: none !important; }
[data-lang="en"] .lang-id { display: none !important; }
.lang-en, .lang-id { display: inline; }

.sidebar-bottom-controls {
    border-top: 1px solid var(--surface2);
    margin-top: 8px;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    cursor: pointer;
    color: var(--text2);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
    border: none;
    background: none;
    font-family: var(--font);
    width: 100%;
    text-align: left;
}
.lang-toggle:hover {
    color: var(--text);
    background: rgba(56,189,248,0.05);
}
.lang-toggle-icon {
    font-size: 1rem;
    width: 24px;
    text-align: center;
}

/* ========== LIGHT THEME CODE SYNTAX ========== */
[data-theme="light"] .code-block .kw { color: #d32f2f; }
[data-theme="light"] .code-block .fn { color: #7b1fa2; }
[data-theme="light"] .code-block .str { color: #0277bd; }
[data-theme="light"] .code-block .cm { color: #78909c; }
[data-theme="light"] .code-block .num { color: #1565c0; }
[data-theme="light"] .code-block .type { color: #e65100; }
[data-theme="light"] code {
    background: var(--bg3);
    color: var(--accent);
}
[data-theme="light"] .anim-container {
    background: var(--bg2);
}
[data-theme="light"] #nav-menu li a:hover {
    background: rgba(2,132,199,0.05);
}
[data-theme="light"] #nav-menu li a.active {
    background: rgba(2,132,199,0.1);
    border-left-color: var(--accent);
}
[data-theme="light"] .lang-card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.08);
}

/* ========== ABOUT PAGE ========== */
.about-hero {
    display: grid;
    grid-template-columns: minmax(260px, 360px) 1fr;
    gap: 32px;
    align-items: start;
    padding: 16px 0;
}
.about-photo-wrap {
    position: relative;
    border-radius: 18px;
    overflow: hidden;
    aspect-ratio: 3 / 4;
    background: var(--bg2);
    border: 1px solid var(--surface2);
    box-shadow: 0 18px 50px rgba(0,0,0,0.35);
}
.about-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 25%;
    display: block;
    filter: saturate(1.05);
}
.about-photo-wrap::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 35%, rgba(0,0,0,0) 0%, rgba(0,0,0,0) 40%, rgba(0,0,0,0.25) 78%, rgba(0,0,0,0.5) 100%);
    mix-blend-mode: multiply;
    pointer-events: none;
}
.about-roles { color: var(--text2); font-size: 0.95rem; margin-bottom: 14px; }
.about-list { margin: 8px 0 4px 20px; }
.about-list li { margin: 6px 0; font-size: 0.92rem; }
.about-contacts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 8px;
    margin-top: 8px;
}
.about-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--surface);
    border: 1px solid var(--surface2);
    padding: 10px 14px;
    border-radius: 10px;
    color: var(--text);
    font-size: 0.85rem;
    transition: all 0.2s;
    text-decoration: none;
}
.about-link:hover {
    border-color: var(--accent);
    background: rgba(56,189,248,0.08);
    text-decoration: none;
    transform: translateY(-1px);
}
.about-tag {
    background: rgba(56,189,248,0.15);
    color: var(--accent);
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 6px;
    margin-left: 4px;
}
[data-theme="light"] .about-link { background: white; }
[data-theme="light"] .about-link:hover { background: rgba(2,132,199,0.06); }

/* ========== SITE FOOTER (compact, at bottom of content) ========== */
#site-footer {
    margin-top: 48px;
    padding: 10px 16px;
    border-top: 1px solid var(--surface2);
    color: var(--text2);
    font-size: 0.72rem;
    text-align: center;
    line-height: 1.7;
}
#site-footer a { color: var(--accent); margin: 0 2px; }
#site-footer strong { color: var(--text); font-weight: 600; }
[data-theme="light"] #site-footer { border-top-color: rgba(0,0,0,0.08); }

@media (max-width: 900px) {
    .about-hero { grid-template-columns: 1fr; }
    .about-photo-wrap { max-width: 320px; margin: 0 auto; }
}