/* The Fold — Hypergame Design System
   Brand: HypergameAI, Inc.
   Ported from Mirror Matrix docs/brand-guide.md
   Non-negotiable: dark bg, no rounded corners >2px, no bounce animations */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- CSS Custom Properties --- */

:root {
    --bg: #050709;
    --surface: #0A0D14;
    --card: #0D1118;
    --card2: #111620;
    --border: rgba(32, 227, 178, .1);
    --border-dim: rgba(255, 255, 255, .05);
    --text: #E6EAF0;
    --text-sec: #6B7A8D;
    --text-dim: #3D4A5A;
    --accent: #20E3B2;
    --accent-glow: rgba(32, 227, 178, .15);
    --accent-dim: rgba(32, 227, 178, .06);
    --warn: #FF5A5F;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    --max: 1140px;
    --radius: 2px;
}

/* --- Reset & Base --- */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    font-weight: 400;
    line-height: 1.65;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
}

/* Ambient grid background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(32, 227, 178, .03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(32, 227, 178, .03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

/* --- Typography --- */

h1, h2, h3, h4 {
    font-family: var(--font);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: var(--text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

.label {
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
}

.mono {
    font-family: var(--mono);
}

p {
    color: var(--text-sec);
    max-width: 640px;
}

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

a:hover {
    text-decoration: underline;
}

/* --- Layout --- */

.container {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

section {
    padding: 80px 0;
}

/* --- Navigation Bar --- */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: rgba(5, 7, 9, .85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-dim);
    z-index: 100;
    display: flex;
    align-items: center;
}

.nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.nav-brand {
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    font-size: 0.8rem;
    color: var(--text-sec);
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text);
    text-decoration: none;
}

/* --- Card Component --- */

.card {
    background: var(--card);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius);
    padding: 24px;
    transition: border-color 0.2s;
}

.card:hover {
    border-color: var(--border);
}

.card-elevated {
    background: var(--card2);
}

/* --- Button Component --- */

.btn {
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg);
}

.btn-primary:hover {
    background: #1dd4a6;
    box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-secondary {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--accent-dim);
    border-color: var(--accent);
}

/* --- Badge / Tag Component --- */

.badge {
    font-family: var(--mono);
    font-size: 0.62rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: var(--radius);
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid var(--border);
    display: inline-block;
}

.badge-warn {
    background: rgba(255, 90, 95, .08);
    color: var(--warn);
    border-color: rgba(255, 90, 95, .2);
}

/* --- SCS Gauge Component --- */

.scs-gauge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.scs-gauge svg {
    width: 140px;
    height: 140px;
}

.scs-gauge-track {
    fill: none;
    stroke: var(--border-dim);
    stroke-width: 8;
}

.scs-gauge-fill {
    fill: none;
    stroke: var(--accent);
    stroke-width: 8;
    stroke-linecap: square;
    transition: stroke-dashoffset 1.5s ease-out;
}

.scs-gauge-text {
    font-family: var(--mono);
    font-size: 2rem;
    font-weight: 700;
    fill: var(--text);
}

.scs-gauge-label {
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    fill: var(--text-sec);
}

.scs-score-low .scs-gauge-fill {
    stroke: var(--warn);
}

.scs-score-low .scs-gauge-text {
    fill: var(--warn);
}

/* --- Split Screen Layout --- */

.split-screen {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.split-panel {
    background: var(--card);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius);
    padding: 20px;
    min-height: 200px;
}

.split-panel-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-dim);
}

.split-panel-title {
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-sec);
}

.split-panel-content {
    font-size: 0.88rem;
    line-height: 1.7;
    color: var(--text);
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 400px;
    overflow-y: auto;
}

.indicator-watched {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 6px var(--accent-glow);
}

.indicator-unwatched {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--warn);
    box-shadow: 0 0 6px rgba(255, 90, 95, .3);
}

/* --- Hero Section --- */

.hero {
    padding-top: 120px;
    padding-bottom: 60px;
    text-align: center;
}

.hero h1 {
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-sec);
    max-width: 640px;
    margin: 0 auto 48px;
}

.hero-result {
    margin-top: 40px;
}

.hero-center {
    display: flex;
    justify-content: center;
    margin: 32px 0;
}

.psbs-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: 20px;
}

/* --- Try It Section --- */

.try-it {
    background: var(--surface);
    border-top: 1px solid var(--border-dim);
    border-bottom: 1px solid var(--border-dim);
}

.try-it h2 {
    text-align: center;
    margin-bottom: 8px;
}

.try-it-desc {
    text-align: center;
    margin: 0 auto 32px;
}

.eval-form {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.eval-form textarea {
    flex: 1;
    background: var(--card);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.88rem;
    padding: 12px 16px;
    resize: vertical;
    min-height: 80px;
    line-height: 1.5;
}

.eval-form textarea::placeholder {
    color: var(--text-dim);
}

.eval-form textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent-glow);
}

.eval-controls {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.eval-controls select {
    background: var(--card);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius);
    color: var(--text);
    font-family: var(--mono);
    font-size: 0.75rem;
    padding: 10px 12px;
    cursor: pointer;
    min-width: 160px;
}

.eval-controls select:focus {
    outline: none;
    border-color: var(--accent);
}

.eval-result {
    display: none;
}

.eval-result.visible {
    display: block;
}

/* --- Loading State --- */

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 40px;
    color: var(--text-sec);
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border-dim);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* --- Analyze Section --- */

.analyze textarea {
    width: 100%;
    background: var(--card);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius);
    color: var(--text);
    font-family: var(--mono);
    font-size: 0.82rem;
    padding: 16px;
    resize: vertical;
    min-height: 160px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.analyze textarea::placeholder {
    color: var(--text-dim);
}

.analyze textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.analyze h2 {
    text-align: center;
    margin-bottom: 8px;
}

.analyze-desc {
    text-align: center;
    margin: 0 auto 32px;
}

.analyze-results {
    display: none;
}

.analyze-results.visible {
    display: block;
    margin-top: 24px;
}

.shift-point {
    background: var(--card);
    border-left: 2px solid var(--accent);
    padding: 12px 16px;
    margin-bottom: 12px;
    border-radius: 0 var(--radius) var(--radius) 0;
}

.shift-point-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.shift-point-turn {
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--accent);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.shift-point-desc {
    font-size: 0.85rem;
    color: var(--text-sec);
}

/* --- Lead Section --- */

.lead-section {
    text-align: center;
    background: var(--surface);
    border-top: 1px solid var(--border-dim);
}

.lead-section h2 {
    margin-bottom: 8px;
}

.lead-section p {
    margin: 0 auto 32px;
}

.lead-form {
    max-width: 480px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.lead-form input {
    background: var(--card);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.88rem;
    padding: 12px 16px;
}

.lead-form input::placeholder {
    color: var(--text-dim);
}

.lead-form input:focus {
    outline: none;
    border-color: var(--accent);
}

.lead-form .secondary-fields {
    display: flex;
    gap: 12px;
}

.lead-form .secondary-fields input {
    flex: 1;
}

.lead-success {
    display: none;
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--accent);
    letter-spacing: 0.05em;
    margin-top: 12px;
}

.lead-success.visible {
    display: block;
}

/* --- Footer --- */

.footer {
    padding: 32px 0;
    border-top: 1px solid var(--border-dim);
    text-align: center;
}

.footer p {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin: 0 auto;
}

/* --- Responsive (<=860px) --- */

@media (max-width: 860px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.35rem; }

    .split-screen {
        grid-template-columns: 1fr;
    }

    .eval-form {
        flex-direction: column;
    }

    .eval-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .lead-form .secondary-fields {
        flex-direction: column;
    }

    .nav-links {
        gap: 16px;
    }

    section {
        padding: 48px 0;
    }

    .hero {
        padding-top: 88px;
    }
}

/* --- Utility --- */

.hidden { display: none; }
.text-center { text-align: center; }
.mt-4 { margin-top: 16px; }
.mt-8 { margin-top: 32px; }
.mb-4 { margin-bottom: 16px; }
.mb-8 { margin-bottom: 32px; }