/* =========================================================================
   style.css
   Design system untuk CipherLattice - AES-128 Simulator.

   Token warna:
     --bg-0 / --bg-1      : latar belakang gelap (dashboard)
     --accent-indigo      : aksi utama (encrypt, tombol primer)
     --accent-cyan        : highlight data / hex / state matrix "after"
     --accent-purple      : highlight sekunder (round key, decrypt)
     --glass-*            : permukaan kaca (glassmorphism)
   ========================================================================= */

:root {
    --bg-0: #080b14;
    --bg-1: #0e1424;
    --bg-2: #141b31;
    --glass-bg: rgba(255, 255, 255, 0.045);
    --glass-bg-strong: rgba(255, 255, 255, 0.07);
    --glass-border: rgba(255, 255, 255, 0.09);

    --accent-indigo: #6366f1;
    --accent-indigo-soft: rgba(99, 102, 241, 0.18);
    --accent-cyan: #22d3ee;
    --accent-cyan-soft: rgba(34, 211, 238, 0.16);
    --accent-purple: #a855f7;
    --accent-purple-soft: rgba(168, 85, 247, 0.16);

    --success: #34d399;
    --danger: #f87171;
    --warning: #fbbf24;

    --text-0: #eef1fb;
    --text-1: #aab2cc;
    --text-2: #6c7594;

    --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
    --font-body: 'Inter', 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;

    --radius-lg: 20px;
    --radius-md: 14px;
    --radius-sm: 8px;

    --sidebar-width: 260px;
}

[data-theme="light"] {
    --bg-0: #eef1f8;
    --bg-1: #f7f8fc;
    --bg-2: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.65);
    --glass-bg-strong: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(20, 27, 49, 0.08);

    --text-0: #131a2e;
    --text-1: #4b5573;
    --text-2: #7c86a3;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg-0);
    color: var(--text-0);
    font-family: var(--font-body);
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    background-image:
        radial-gradient(circle at 15% 0%, var(--accent-indigo-soft), transparent 40%),
        radial-gradient(circle at 90% 15%, var(--accent-cyan-soft), transparent 35%),
        radial-gradient(circle at 50% 100%, var(--accent-purple-soft), transparent 45%);
    background-attachment: fixed;
    transition: background-color .35s ease, color .35s ease;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; margin: 0; padding: 0; }

::selection { background: var(--accent-indigo); color: #fff; }

/* ---------------------------------------------------------------------- */
/* SIDEBAR                                                                 */
/* ---------------------------------------------------------------------- */

.sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: var(--sidebar-width);
    padding: 28px 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 40px;
    padding: 0 4px;
}

.brand-mark {
    font-family: var(--font-mono);
    font-size: 14px;
    letter-spacing: -2px;
    color: var(--accent-cyan);
    background: var(--accent-indigo-soft);
    padding: 8px 9px;
    border-radius: var(--radius-sm);
}

.brand-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 17px;
    letter-spacing: -0.02em;
}

.brand-subtitle {
    font-size: 11px;
    color: var(--text-2);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-1);
    font-size: 14px;
    font-weight: 500;
    transition: background .2s ease, color .2s ease, transform .15s ease;
}

.nav-icon { font-size: 15px; width: 18px; text-align: center; }

.nav-link:hover {
    background: var(--glass-bg-strong);
    color: var(--text-0);
    transform: translateX(2px);
}

.nav-link.active {
    background: linear-gradient(90deg, var(--accent-indigo-soft), transparent);
    color: var(--text-0);
    border-left: 2px solid var(--accent-cyan);
    padding-left: 12px;
}

.sidebar-footer { padding-top: 12px; border-top: 1px solid var(--glass-border); }

.theme-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px;
    border-radius: var(--radius-sm);
    background: var(--glass-bg-strong);
    border: 1px solid var(--glass-border);
    color: var(--text-0);
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background .2s ease;
}
.theme-toggle:hover { background: var(--accent-indigo-soft); }

.sidebar-burger {
    display: none;
    position: fixed;
    top: 16px; left: 16px;
    z-index: 200;
    width: 42px; height: 42px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg-strong);
    color: var(--text-0);
    font-size: 18px;
    backdrop-filter: blur(10px);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 90;
}

/* ---------------------------------------------------------------------- */
/* MAIN CONTENT                                                            */
/* ---------------------------------------------------------------------- */

.main-content {
    margin-left: var(--sidebar-width);
    padding: 28px 44px 80px;
    min-height: 100vh;
}

.breadcrumb-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-2);
    margin-bottom: 28px;
    font-family: var(--font-mono);
}

.breadcrumb-bar .crumb::after {
    content: '/';
    margin-left: 8px;
    color: var(--text-2);
    opacity: 0.5;
}
.breadcrumb-bar .crumb:last-child::after { content: ''; }
.breadcrumb-bar .crumb.current { color: var(--accent-cyan); }

.page-section { display: none; animation: fadeUp .4s ease; }
.page-section.active { display: block; }

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.section-title {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 700;
    margin: 0 0 6px;
    letter-spacing: -0.01em;
}
.section-subtitle {
    color: var(--text-1);
    margin: 0 0 24px;
    font-size: 14.5px;
}

/* ---------------------------------------------------------------------- */
/* HERO                                                                    */
/* ---------------------------------------------------------------------- */

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: center;
    padding: 32px 0 24px;
}

.eyebrow {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--accent-cyan);
    text-transform: uppercase;
    margin-bottom: 16px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 42px;
    line-height: 1.12;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0 0 18px;
}

.hero-desc {
    color: var(--text-1);
    font-size: 15.5px;
    line-height: 1.7;
    max-width: 480px;
    margin: 0 0 28px;
}

.hero-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.byte-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    width: 100%;
    max-width: 320px;
    padding: 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(18px);
}

.byte-cell {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 600;
    border-radius: 8px;
    background: var(--accent-indigo-soft);
    color: var(--accent-cyan);
    animation: bytePulse 2.6s ease-in-out infinite;
}

@keyframes bytePulse {
    0%, 100% { background: var(--accent-indigo-soft); color: var(--accent-cyan); }
    50% { background: var(--accent-purple-soft); color: var(--accent-purple); }
}

.hero-visual-caption {
    font-size: 12px;
    color: var(--text-2);
    font-family: var(--font-mono);
}

.feature-strip {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-top: 36px;
}

.feature-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 22px;
    backdrop-filter: blur(16px);
    transition: transform .2s ease, border-color .2s ease;
}
.feature-card:hover { transform: translateY(-3px); border-color: var(--accent-cyan); }

.feature-num {
    font-family: var(--font-mono);
    color: var(--accent-cyan);
    font-size: 13px;
    margin-bottom: 10px;
}
.feature-title { font-family: var(--font-display); font-weight: 600; font-size: 15.5px; margin-bottom: 6px; }
.feature-text { font-size: 13.2px; color: var(--text-1); line-height: 1.55; }

/* ---------------------------------------------------------------------- */
/* GLASS CARD / GENERIC SURFACES                                          */
/* ---------------------------------------------------------------------- */

.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 20px 50px -25px rgba(0,0,0,0.6);
    margin-bottom: 24px;
}

/* ---------------------------------------------------------------------- */
/* FORM ELEMENTS                                                          */
/* ---------------------------------------------------------------------- */

.mode-switch {
    display: inline-flex;
    background: var(--glass-bg-strong);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    padding: 4px;
    margin-bottom: 26px;
}

.mode-btn {
    border: none;
    background: transparent;
    color: var(--text-1);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 13.5px;
    padding: 9px 22px;
    border-radius: 999px;
    cursor: pointer;
    transition: all .2s ease;
}
.mode-btn.active {
    background: linear-gradient(135deg, var(--accent-indigo), var(--accent-purple));
    color: #fff;
}

.field-group { margin-bottom: 20px; }
.field-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-1);
    margin-bottom: 8px;
}

.text-input {
    width: 100%;
    padding: 13px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    background: var(--bg-1);
    color: var(--text-0);
    font-size: 14.5px;
    outline: none;
    transition: border-color .2s ease, box-shadow .2s ease;
}
.text-input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px var(--accent-cyan-soft);
}
.text-input.invalid { border-color: var(--danger); }
.text-input.valid { border-color: var(--success); }

.mono { font-family: var(--font-mono); letter-spacing: 0.02em; }

.field-hint { font-size: 12px; color: var(--text-2); margin-top: 6px; }
.field-hint.error { color: var(--danger); }
.field-hint.ok { color: var(--success); }

.radio-row { display: flex; gap: 12px; flex-wrap: wrap; }
.radio-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: var(--bg-1);
    font-size: 13.5px;
    cursor: pointer;
    transition: border-color .2s ease, background .2s ease;
}
.radio-pill:has(input:checked) {
    border-color: var(--accent-indigo);
    background: var(--accent-indigo-soft);
}

.action-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }

/* ---------------------------------------------------------------------- */
/* BUTTONS                                                                 */
/* ---------------------------------------------------------------------- */

.btn {
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 13.8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .2s ease, opacity .2s ease;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
    background: linear-gradient(135deg, var(--accent-indigo), var(--accent-purple));
    color: #fff;
    box-shadow: 0 10px 30px -12px var(--accent-indigo);
}
.btn-primary:hover { box-shadow: 0 14px 34px -10px var(--accent-purple); }

.btn-ghost {
    background: transparent;
    color: var(--text-1);
    border-color: var(--glass-border);
}
.btn-ghost:hover { color: var(--text-0); border-color: var(--text-2); }

.btn-small { padding: 8px 16px; font-size: 12.5px; }
.btn-lg { padding: 15px 30px; font-size: 14.5px; }

/* ---------------------------------------------------------------------- */
/* LOADING / PROGRESS                                                     */
/* ---------------------------------------------------------------------- */

.loading-box { margin: 20px 0; }
.progress-track {
    width: 100%;
    height: 6px;
    border-radius: 999px;
    background: var(--glass-bg-strong);
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    width: 0%;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--accent-indigo), var(--accent-cyan));
    transition: width .3s ease;
}
.loading-text { font-size: 12.5px; color: var(--text-2); margin-top: 8px; font-family: var(--font-mono); }

/* ---------------------------------------------------------------------- */
/* RESULT CARD                                                            */
/* ---------------------------------------------------------------------- */

.result-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.result-header h3 { font-family: var(--font-display); margin: 0; font-size: 18px; }
.result-actions { display: flex; gap: 10px; }

.result-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}
.result-item {
    background: var(--bg-1);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
}
.result-label { font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-2); margin-bottom: 6px; }
.result-value { font-size: 14.5px; word-break: break-all; color: var(--accent-cyan); }

.hexview-block, .statematrix-block { margin-top: 8px; margin-bottom: 20px; }
.hexview {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}
.hex-byte {
    font-family: var(--font-mono);
    font-size: 12.5px;
    padding: 6px 9px;
    border-radius: 6px;
    background: var(--accent-indigo-soft);
    color: var(--text-0);
}

/* ---------------------------------------------------------------------- */
/* STATE MATRIX TABLES                                                     */
/* ---------------------------------------------------------------------- */

.matrix-pair-wrap {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    margin: 14px 0 22px;
}

.matrix-block { flex: 1; min-width: 200px; }
.matrix-block-title {
    font-size: 11.5px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-2);
    margin-bottom: 8px;
    font-weight: 600;
}

table.state-matrix {
    border-collapse: separate;
    border-spacing: 5px;
}
table.state-matrix td {
    width: 46px;
    height: 40px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 600;
    border-radius: 8px;
    background: var(--bg-1);
    border: 1px solid var(--glass-border);
    color: var(--text-0);
}

table.state-matrix.style-before td { background: var(--accent-purple-soft); color: var(--accent-purple); }
table.state-matrix.style-after td { background: var(--accent-cyan-soft); color: var(--accent-cyan); }
table.state-matrix.style-key td { background: var(--accent-indigo-soft); color: var(--accent-indigo); }
table.state-matrix.style-neutral td { background: var(--bg-1); }

/* ---------------------------------------------------------------------- */
/* ACCORDION (Round Detail & Key Expansion)                                */
/* ---------------------------------------------------------------------- */

.accordion-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    backdrop-filter: blur(16px);
}

.accordion-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    cursor: pointer;
    user-select: none;
}
.accordion-header:hover { background: var(--glass-bg-strong); }

.accordion-title { font-family: var(--font-display); font-weight: 600; font-size: 15px; display: flex; align-items: center; gap: 10px; }
.accordion-badge {
    font-family: var(--font-mono);
    font-size: 11px;
    padding: 3px 9px;
    border-radius: 999px;
    background: var(--accent-indigo-soft);
    color: var(--accent-cyan);
}
.accordion-chevron { transition: transform .25s ease; color: var(--text-2); }
.accordion-item.open .accordion-chevron { transform: rotate(180deg); }

.accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease;
    padding: 0 20px;
}
.accordion-item.open .accordion-body {
    padding: 6px 20px 22px;
}

.step-block { margin-bottom: 22px; padding-bottom: 18px; border-bottom: 1px dashed var(--glass-border); }
.step-block:last-child { border-bottom: none; margin-bottom: 0; }
.step-block-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 14px;
    color: var(--accent-cyan);
    margin-bottom: 10px;
}

.word-chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 6px; }
.word-chip {
    font-family: var(--font-mono);
    font-size: 12.5px;
    padding: 6px 10px;
    border-radius: 6px;
    background: var(--bg-1);
    border: 1px solid var(--glass-border);
}
.word-chip .chip-tag { color: var(--text-2); margin-right: 6px; font-size: 10.5px; text-transform: uppercase; }

/* ---------------------------------------------------------------------- */
/* KEY EXPANSION TABLE                                                     */
/* ---------------------------------------------------------------------- */

.word-table-wrap { overflow-x: auto; margin-bottom: 20px; }
table.word-table { border-collapse: collapse; width: 100%; font-family: var(--font-mono); font-size: 12.5px; }
table.word-table th, table.word-table td {
    padding: 8px 10px;
    border-bottom: 1px solid var(--glass-border);
    text-align: left;
    white-space: nowrap;
}
table.word-table th { color: var(--text-2); font-weight: 600; text-transform: uppercase; font-size: 10.5px; letter-spacing: .04em; }
table.word-table tr:hover td { background: var(--glass-bg-strong); }
.tag-rot { color: var(--accent-purple); }
.tag-sub { color: var(--accent-cyan); }
.tag-rcon { color: var(--warning); }

.roundkey-strip { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 10px; }
.roundkey-item { text-align: center; }
.roundkey-item .matrix-block-title { text-align: center; }

.empty-state {
    padding: 60px 20px;
    text-align: center;
    color: var(--text-2);
    border: 1px dashed var(--glass-border);
    border-radius: var(--radius-lg);
    font-size: 14px;
}

.about-card p { color: var(--text-1); line-height: 1.75; font-size: 14.5px; }
.about-list { margin-top: 14px; }
.about-list li { color: var(--text-1); padding: 6px 0; font-size: 13.5px; position: relative; padding-left: 18px; }
.about-list li::before { content: '\2192'; position: absolute; left: 0; color: var(--accent-cyan); }

.hidden { display: none !important; }

/* Bootstrap alert override to match glass theme */
.alert {
    border-radius: var(--radius-sm) !important;
    border: 1px solid var(--glass-border) !important;
    backdrop-filter: blur(10px);
    font-size: 13.8px;
    font-family: var(--font-body);
}