/* ══════════════════════════════════════════════════
   BitrateBoss — The Target File Size Forecaster
   Design: Cinema dark theme with cyan/electric accent
   ══════════════════════════════════════════════════ */

:root {
    --clr-bg: #090b10;
    --clr-surface: #0f1218;
    --clr-surface-2: #171c24;
    --clr-surface-3: #1c2230;
    --clr-border: #252d3a;
    --clr-border-light: #2f3a4a;
    --clr-text: #e2e8f0;
    --clr-text-muted: #7b8ba4;
    --clr-accent: #06b6d4;
    --clr-accent-dim: #0891b2;
    --clr-accent-glow: rgba(6, 182, 212, 0.12);
    --clr-accent-glow-strong: rgba(6, 182, 212, 0.25);
    --clr-excellent: #22c55e;
    --clr-good: #4ade80;
    --clr-ok: #f59e0b;
    --clr-low: #f97316;
    --clr-bad: #ef4444;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 6px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --font-sans: 'Space Grotesk', 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
    font-family: var(--font-sans); background: var(--clr-bg); color: var(--clr-text);
    line-height: 1.6; min-height: 100vh; -webkit-font-smoothing: antialiased;
}
.container { max-width: 1100px; margin: 0 auto; padding: 0 1rem; }
.hidden { display: none !important; }

/* ── Ad Slots ── */
.ad-slot {
    display: flex; align-items: center; justify-content: center;
    border: 1px dashed var(--clr-border); color: var(--clr-text-muted);
    font-size: 0.75rem; text-transform: uppercase; background: var(--clr-surface);
}
.ad-slot--mobile { height: 50px; max-width: 320px; margin: 0 auto 1rem; }
.ad-slot--desktop { display: none; height: 90px; max-width: 728px; margin: 1.5rem auto; }
@media (min-width: 768px) { .ad-slot--mobile { display: none; } .ad-slot--desktop { display: flex; } }

/* ══════════════════════════════════════
   HEADER
   ══════════════════════════════════════ */
.site-header {
    text-align: center; padding: 2.5rem 1rem 1.5rem;
    background: linear-gradient(180deg, var(--clr-surface) 0%, var(--clr-bg) 100%);
    border-bottom: 1px solid var(--clr-border);
}
.brand { display: flex; align-items: center; justify-content: center; gap: 0.6rem; }
.brand-icon { font-size: 2rem; }
.brand-name { font-size: 1.75rem; font-weight: 800; letter-spacing: -0.02em; }
.brand-accent { color: var(--clr-accent); }
.brand-tagline { font-size: 0.95rem; color: var(--clr-text-muted); margin-top: 0.25rem; font-weight: 500; }
.brand-subtitle { font-size: 0.85rem; color: var(--clr-text-muted); margin-top: 0.5rem; opacity: 0.7; }

/* ── Privacy Badge ── */
.privacy-badge {
    display: flex; align-items: center; gap: 0.5rem; justify-content: center;
    padding: 0.6rem 1rem; margin: 1.5rem auto; max-width: 380px;
    background: var(--clr-accent-glow); border: 1px solid var(--clr-accent);
    border-radius: 100px; font-size: 0.78rem; font-weight: 500; color: var(--clr-accent);
}

/* ══════════════════════════════════════
   LAYOUT GRID
   ══════════════════════════════════════ */
.app-grid { display: grid; gap: 1.5rem; margin-top: 1.5rem; }
@media (min-width: 768px) { .app-grid { grid-template-columns: 1fr 1fr; align-items: start; } }

/* ── Panels ── */
.panel {
    background: var(--clr-surface); border: 1px solid var(--clr-border);
    border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow);
}
.panel-title {
    font-size: 1.1rem; font-weight: 700; margin-bottom: 1.25rem;
    padding-bottom: 0.75rem; border-bottom: 1px solid var(--clr-border);
}

/* ══════════════════════════════════════
   INPUT ELEMENTS
   ══════════════════════════════════════ */
.input-fieldset {
    border: 1px solid var(--clr-border); border-radius: var(--radius-sm);
    padding: 1rem; margin-bottom: 1rem;
}
.input-fieldset legend {
    font-size: 0.8rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.06em; color: var(--clr-accent); padding: 0 0.4rem;
}

.input-row { display: flex; gap: 0.75rem; }
.input-row .input-group { flex: 1; }
.input-with-unit { display: flex; gap: 0.5rem; }
.input-with-unit input { flex: 1; }
.input-with-unit select { width: 70px; }

.input-group { margin-bottom: 0.85rem; }
.input-group label {
    display: block; font-size: 0.8rem; font-weight: 600; color: var(--clr-text-muted); margin-bottom: 0.3rem;
}
.input-group input, .input-group select {
    width: 100%; padding: 0.65rem 0.85rem; font-size: 0.95rem;
    font-family: var(--font-mono); background: var(--clr-surface-2);
    border: 1px solid var(--clr-border); border-radius: var(--radius-sm);
    color: var(--clr-text); transition: border-color var(--transition);
}
.input-group input:focus, .input-group select:focus {
    outline: none; border-color: var(--clr-accent); box-shadow: 0 0 0 3px var(--clr-accent-glow);
}
.input-group input::placeholder { color: var(--clr-text-muted); opacity: 0.5; }

/* Remove number spinners */
.input-group input[type="number"]::-webkit-outer-spin-button,
.input-group input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.input-group input[type="number"] { -moz-appearance: textfield; }

/* ── Preset Buttons ── */
.preset-buttons { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.5rem; }
.btn-preset {
    padding: 0.35rem 0.65rem; font-size: 0.72rem; font-weight: 600;
    font-family: var(--font-sans); color: var(--clr-text-muted);
    background: var(--clr-surface-2); border: 1px solid var(--clr-border);
    border-radius: var(--radius-xs); cursor: pointer; transition: all var(--transition);
    white-space: nowrap;
}
.btn-preset:hover, .btn-preset.active {
    color: var(--clr-accent); border-color: var(--clr-accent); background: var(--clr-accent-glow);
}

/* ── Toggle Group ── */
.toggle-group {
    display: flex; gap: 0; border-radius: var(--radius-sm); overflow: hidden;
    border: 1px solid var(--clr-border);
}
.btn-toggle {
    flex: 1; padding: 0.55rem 0.75rem; font-size: 0.82rem; font-weight: 600;
    font-family: var(--font-sans); color: var(--clr-text-muted); text-align: center;
    background: var(--clr-surface-2); border: none; cursor: pointer;
    transition: all var(--transition);
}
.btn-toggle:not(:last-child) { border-right: 1px solid var(--clr-border); }
.btn-toggle.active {
    color: var(--clr-bg); background: var(--clr-accent); font-weight: 700;
}
.btn-toggle:hover:not(.active) { color: var(--clr-text); background: var(--clr-surface-3); }

/* ── Error Message ── */
.error-message {
    padding: 0.75rem 1rem; margin-bottom: 0.75rem; font-size: 0.85rem;
    background: rgba(239, 68, 68, 0.1); border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm); color: var(--clr-bad);
}

/* ── Calculate Button ── */
.btn-calculate {
    display: block; width: 100%; padding: 0.85rem; margin-top: 0.5rem;
    font-size: 1rem; font-weight: 700; font-family: var(--font-sans);
    color: #fff; background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent-dim));
    border: none; border-radius: var(--radius-sm); cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
}
.btn-calculate:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(6, 182, 212, 0.35); }
.btn-calculate:active { transform: translateY(0); }

/* ══════════════════════════════════════
   SUMMARY CARDS
   ══════════════════════════════════════ */
.summary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-bottom: 1.25rem; }
.summary-card {
    background: var(--clr-surface-2); border: 1px solid var(--clr-border);
    border-radius: var(--radius-sm); padding: 0.9rem; text-align: center;
    transition: transform var(--transition-fast), border-color var(--transition);
}
.summary-card:hover { transform: translateY(-2px); }
.summary-card--highlight {
    border-color: var(--clr-accent);
    background: var(--clr-accent-glow);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.15);
}
.summary-card--wide { grid-column: 1 / -1; }
.summary-label {
    display: block; font-size: 0.7rem; text-transform: uppercase;
    letter-spacing: 0.06em; color: var(--clr-text-muted); margin-bottom: 0.3rem;
}
.summary-value {
    display: block; font-size: 1.25rem; font-weight: 800;
    font-family: var(--font-mono); color: var(--clr-text);
}
.summary-card--highlight .summary-value { color: var(--clr-accent); font-size: 1.5rem; }

/* ══════════════════════════════════════
   QUALITY GAUGE — Multi-Segment
   ══════════════════════════════════════ */
.quality-gauge { margin-bottom: 1.25rem; }
.gauge-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.6rem; }

.gauge-track {
    position: relative; display: flex; height: 24px;
    border-radius: 12px; overflow: hidden;
    border: 1px solid var(--clr-border); background: var(--clr-surface-2);
}
.gauge-segment {
    flex: 1; position: relative; transition: opacity var(--transition);
}
.gauge-seg--unwatchable { background: var(--clr-bad); }
.gauge-seg--low { background: var(--clr-low); }
.gauge-seg--acceptable { background: var(--clr-ok); }
.gauge-seg--good { background: var(--clr-good); }
.gauge-seg--excellent { background: var(--clr-excellent); }

.gauge-needle {
    position: absolute; top: -4px; width: 4px; height: 32px;
    background: #fff; border-radius: 2px;
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.6);
    transition: left 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    left: 0; z-index: 2;
}

.gauge-labels {
    display: flex; justify-content: space-between;
    font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.04em;
    color: var(--clr-text-muted); margin-top: 0.35rem; padding: 0 0.1rem;
}
.gauge-label {
    font-size: 0.82rem; color: var(--clr-text-muted); margin-top: 0.5rem;
    font-weight: 500; line-height: 1.4;
}
.gauge-suggestion {
    font-size: 0.8rem; color: var(--clr-ok); margin-top: 0.3rem;
    font-style: italic; line-height: 1.4;
}

/* ══════════════════════════════════════
   FILE SIZE BREAKDOWN BAR
   ══════════════════════════════════════ */
.breakdown-section { margin-bottom: 1.25rem; }
.section-title { font-size: 0.9rem; font-weight: 700; margin-bottom: 0.6rem; }
.section-subtitle { font-size: 0.75rem; color: var(--clr-text-muted); margin: -0.3rem 0 0.6rem; }

.breakdown-bar {
    display: flex; height: 28px; border-radius: 8px; overflow: hidden;
    border: 1px solid var(--clr-border); background: var(--clr-surface-2);
}
.breakdown-seg {
    display: flex; align-items: center; justify-content: center;
    transition: width 0.5s ease; min-width: 0; overflow: hidden;
}
.breakdown-seg-label {
    font-size: 0.68rem; font-weight: 600; font-family: var(--font-mono);
    color: rgba(0, 0, 0, 0.7); white-space: nowrap; padding: 0 0.4rem;
}
.breakdown-seg--video { background: var(--clr-accent); }
.breakdown-seg--audio { background: var(--clr-ok); }
.breakdown-seg--overhead { background: var(--clr-text-muted); }

.breakdown-legend {
    display: flex; gap: 1rem; margin-top: 0.5rem; font-size: 0.72rem; color: var(--clr-text-muted);
}
.legend-item { display: flex; align-items: center; gap: 0.3rem; }
.legend-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.legend-dot--video { background: var(--clr-accent); }
.legend-dot--audio { background: var(--clr-ok); }
.legend-dot--overhead { background: var(--clr-text-muted); }

/* ══════════════════════════════════════
   NLE EXPORT TABS
   ══════════════════════════════════════ */
.nle-section { margin-bottom: 1.25rem; }
.nle-tabs {
    display: flex; gap: 0; border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    overflow: hidden; border: 1px solid var(--clr-border); border-bottom: none;
}
.nle-tab {
    flex: 1; padding: 0.55rem 0.5rem; font-size: 0.75rem; font-weight: 600;
    font-family: var(--font-sans); color: var(--clr-text-muted); text-align: center;
    background: var(--clr-surface-2); border: none; cursor: pointer;
    transition: all var(--transition); white-space: nowrap;
}
.nle-tab:not(:last-child) { border-right: 1px solid var(--clr-border); }
.nle-tab.active { color: var(--clr-accent); background: var(--clr-surface-3); }
.nle-tab:hover:not(.active) { color: var(--clr-text); }

.nle-panel {
    display: none;
    border: 1px solid var(--clr-border); border-top: none;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    padding: 0.75rem; background: var(--clr-surface-2);
}
.nle-panel.active { display: block; }

/* ── Command Block ── */
.command-pre {
    background: var(--clr-bg); border: 1px solid var(--clr-border);
    border-radius: var(--radius-sm); padding: 0.75rem 1rem; overflow-x: auto;
    font-family: var(--font-mono); font-size: 0.78rem; color: var(--clr-accent);
    line-height: 1.5; white-space: pre-wrap; word-break: break-all;
}

.btn-copy {
    margin-top: 0.5rem; padding: 0.4rem 0.8rem; font-size: 0.78rem;
    font-weight: 600; font-family: var(--font-sans); color: var(--clr-text-muted);
    background: var(--clr-surface-2); border: 1px solid var(--clr-border);
    border-radius: var(--radius-xs); cursor: pointer; transition: all var(--transition);
}
.btn-copy:hover { color: var(--clr-accent); border-color: var(--clr-accent); }

/* ══════════════════════════════════════
   RESOLUTION COMPARISON TABLE
   ══════════════════════════════════════ */
.comparison-section { margin-bottom: 1.25rem; }
.table-wrap { overflow-x: auto; }
.comparison-table {
    width: 100%; border-collapse: collapse; font-size: 0.82rem;
    font-family: var(--font-mono);
}
.comparison-table th {
    text-align: left; padding: 0.6rem 0.75rem; font-size: 0.7rem;
    text-transform: uppercase; letter-spacing: 0.06em; color: var(--clr-text-muted);
    border-bottom: 2px solid var(--clr-border); font-family: var(--font-sans); font-weight: 700;
}
.comparison-table td {
    padding: 0.55rem 0.75rem; border-bottom: 1px solid var(--clr-border);
}
.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table tr.row-current {
    background: var(--clr-accent-glow); border-left: 3px solid var(--clr-accent);
}
.comparison-table .quality-badge {
    display: inline-flex; align-items: center; gap: 0.3rem;
    padding: 0.15rem 0.5rem; border-radius: 100px; font-size: 0.72rem;
    font-weight: 600; font-family: var(--font-sans); white-space: nowrap;
}
.quality-badge--excellent { background: rgba(34, 197, 94, 0.15); color: var(--clr-excellent); }
.quality-badge--good { background: rgba(74, 222, 128, 0.15); color: var(--clr-good); }
.quality-badge--acceptable { background: rgba(245, 158, 11, 0.15); color: var(--clr-ok); }
.quality-badge--low { background: rgba(249, 115, 22, 0.15); color: var(--clr-low); }
.quality-badge--unwatchable { background: rgba(239, 68, 68, 0.15); color: var(--clr-bad); }
.placeholder-row td { color: var(--clr-text-muted); text-align: center; font-family: var(--font-sans); }

/* ── Export Buttons ── */
.export-actions {
    display: flex; gap: 0.75rem; flex-wrap: wrap;
}
.btn-export {
    flex: 1; min-width: 140px; padding: 0.65rem 1rem; font-size: 0.85rem;
    font-weight: 600; font-family: var(--font-sans); color: var(--clr-text-muted);
    background: var(--clr-surface-2); border: 1px solid var(--clr-border);
    border-radius: var(--radius-sm); cursor: pointer; text-align: center;
    transition: all var(--transition);
}
.btn-export:hover { color: var(--clr-accent); border-color: var(--clr-accent); transform: translateY(-1px); }

/* ══════════════════════════════════════
   HOW IT WORKS
   ══════════════════════════════════════ */
.how-it-works {
    margin-top: 2.5rem; padding: 2rem 0;
    border-top: 1px solid var(--clr-border);
}
.section-heading {
    text-align: center; font-size: 1.3rem; font-weight: 700;
    margin-bottom: 1.5rem;
}
.info-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (min-width: 768px) { .info-cards { grid-template-columns: repeat(4, 1fr); } }

.info-card {
    background: var(--clr-surface); border: 1px solid var(--clr-border);
    border-radius: var(--radius); padding: 1.25rem; text-align: center;
    transition: transform var(--transition), border-color var(--transition);
}
.info-card:hover { transform: translateY(-3px); border-color: var(--clr-accent); }
.info-icon { font-size: 1.8rem; display: block; margin-bottom: 0.5rem; }
.info-card h3 { font-size: 0.9rem; font-weight: 700; margin-bottom: 0.4rem; }
.info-card p { font-size: 0.78rem; color: var(--clr-text-muted); line-height: 1.5; }

/* ══════════════════════════════════════
   FOOTER
   ══════════════════════════════════════ */
.site-footer {
    text-align: center; padding: 2rem 1rem; margin-top: 2.5rem;
    border-top: 1px solid var(--clr-border); font-size: 0.8rem; color: var(--clr-text-muted);
}
.footer-privacy { font-weight: 600; color: var(--clr-accent); margin-bottom: 0.3rem; }
.footer-disclaimer { font-size: 0.75rem; margin-bottom: 0.5rem; opacity: 0.7; }
.footer-copyright { margin-top: 0.5rem; }

/* ══════════════════════════════════════
   TOAST NOTIFICATION
   ══════════════════════════════════════ */
.toast {
    position: fixed; bottom: -60px; left: 50%; transform: translateX(-50%);
    padding: 0.7rem 1.25rem; border-radius: 100px;
    background: var(--clr-surface-3); border: 1px solid var(--clr-accent);
    color: var(--clr-accent); font-size: 0.85rem; font-weight: 600;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
    transition: bottom 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 1000; white-space: nowrap;
}
.toast.show { bottom: 2rem; }

/* ══════════════════════════════════════
   RESPONSIVE ENHANCEMENTS
   ══════════════════════════════════════ */
@media (max-width: 480px) {
    .brand-name { font-size: 1.4rem; }
    .panel { padding: 1rem; }
    .input-fieldset { padding: 0.75rem; }
    .summary-value { font-size: 1.1rem; }
    .summary-card--highlight .summary-value { font-size: 1.3rem; }
    .nle-tab { font-size: 0.68rem; padding: 0.5rem 0.3rem; }
    .info-cards { grid-template-columns: 1fr; }
    .gauge-labels { font-size: 0.55rem; }
}

@media (min-width: 768px) {
    .brand-name { font-size: 2rem; }
    .site-header { padding: 3rem 1rem 2rem; }
    .panel { padding: 1.75rem; }
    .summary-grid { grid-template-columns: repeat(3, 1fr); }
    .summary-card--wide { grid-column: 1 / -1; }
}

@media (min-width: 1024px) {
    .container { padding: 0 2rem; }
}

/* ══════════════════════════════════════
   ANIMATIONS
   ══════════════════════════════════════ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 15px rgba(6, 182, 212, 0.15); }
    50% { box-shadow: 0 0 25px rgba(6, 182, 212, 0.3); }
}

.panel--results { animation: fadeInUp 0.4s ease-out; }
.summary-card--highlight { animation: pulseGlow 3s ease-in-out infinite; }