/* ── Reset & Base ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #f5f0e8;
    --bg-card: #ffffff;
    --bg-card-hover: #faf7f1;
    --bg-elevated: #f0ebe1;
    --border: #d4cfc6;
    --text: #2a3a5c;
    --text-muted: #6b7a96;
    --accent: #b8993e;
    --accent-dim: #9a7d2e;
    --success: #2e8b57;
    --success-bg: rgba(46, 139, 87, 0.1);
    --danger: #c54040;
    --danger-bg: rgba(197, 64, 64, 0.1);
    --warning: #c0880a;
    --warning-bg: rgba(192, 136, 10, 0.1);
    --mn-color: #4a50a8;
    --ga-color: #c86a1a;
    --or-color: #178a7a;
    --demo-color: #b8993e;
    --radius: 8px;
    --radius-lg: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* ── Header ───────────────────────────────────────────────────────── */
header {
    background: linear-gradient(135deg, #2a3a5c 0%, #354a6e 100%);
    border-bottom: 1px solid var(--border);
    padding: 2rem 0;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

h1 {
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: #e8e4dc;
}

h1 .accent { color: #d4b85c; }

.subtitle {
    color: #a0afc0;
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

.header-nav { margin-top: 0.75rem; }
.nav-link {
    color: #d4b85c;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.4rem 1rem;
    border: 1px solid var(--accent-dim);
    border-radius: 20px;
    transition: all 0.15s ease;
}
.nav-link:hover {
    background: rgba(184,153,62,0.1);
    border-color: var(--accent);
}

/* ── Main ─────────────────────────────────────────────────────────── */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* ── Scenario Cards ───────────────────────────────────────────────── */
.scenario-panel h2 {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.8rem;
}

.scenario-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.scenario-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    cursor: pointer;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    transition: all 0.15s ease;
    color: var(--text);
    text-align: left;
    font-family: inherit;
    font-size: inherit;
}

.scenario-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-dim);
    transform: translateY(-1px);
}

.scenario-card.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}

.scenario-card-demo {
    border-color: var(--accent-dim);
    background: linear-gradient(135deg, var(--bg-card) 0%, #f0ebe1 100%);
}

.card-state {
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    flex-shrink: 0;
    text-transform: uppercase;
}

.card-state.ga { background: rgba(200,106,26,0.1); color: var(--ga-color); }
.card-state.mn { background: rgba(74,80,168,0.1); color: var(--mn-color); }
.card-state.or { background: rgba(23,138,122,0.1); color: var(--or-color); }
.card-state.demo { background: rgba(184,153,62,0.1); color: var(--demo-color); }

.card-body strong { display: block; font-size: 0.9rem; margin-bottom: 0.15rem; }
.card-body span { font-size: 0.75rem; color: var(--text-muted); }

/* ── Loading ──────────────────────────────────────────────────────── */
.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 1rem;
}

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

/* ── Result Header ────────────────────────────────────────────────── */
.result-header {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.result-header .rh-left { display: flex; align-items: center; gap: 1rem; }
.result-header .rh-name { font-weight: 600; font-size: 1.1rem; }
.result-header .rh-meta { font-size: 0.8rem; color: var(--text-muted); }

.status-badge {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.3rem 0.75rem;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-badge.issue { background: var(--success-bg); color: var(--success); }
.status-badge.declined { background: var(--danger-bg); color: var(--danger); }
.status-badge.uw_queue { background: var(--warning-bg); color: var(--warning); }
.status-badge.info { background: rgba(184,153,62,0.1); color: var(--accent); }

/* ── Agent Chain ──────────────────────────────────────────────────── */
.agent-chain {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-bottom: 1.5rem;
}

.agent-step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    display: grid;
    grid-template-columns: 2fr 1fr 3fr auto;
    align-items: center;
    gap: 1rem;
    margin-bottom: -1px;
}

.agent-step:first-child { border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
.agent-step:last-child { border-radius: 0 0 var(--radius-lg) var(--radius-lg); margin-bottom: 0; }
.agent-step:only-child { border-radius: var(--radius-lg); }

.agent-step .step-label {
    font-weight: 600;
    font-size: 0.85rem;
}

.agent-step .step-num {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-right: 0.5rem;
}

.agent-step .step-decision {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
    display: inline-block;
    width: fit-content;
}

.step-decision.success { background: var(--success-bg); color: var(--success); }
.step-decision.danger { background: var(--danger-bg); color: var(--danger); }
.step-decision.warning { background: var(--warning-bg); color: var(--warning); }
.step-decision.muted { background: rgba(107,122,150,0.08); color: var(--text-muted); }
.step-decision.info { background: rgba(184,153,62,0.1); color: var(--accent); }

.agent-step .step-details {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1rem;
}

.step-detail-item { white-space: nowrap; }
.step-detail-item strong { color: var(--text); font-weight: 500; }

.agent-step .step-confidence {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: right;
    white-space: nowrap;
}

.confidence-bar {
    width: 40px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
    display: inline-block;
    vertical-align: middle;
    margin-left: 0.35rem;
}

.confidence-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 0.5s ease;
}

.confidence-fill.high { background: var(--success); }
.confidence-fill.mid { background: var(--warning); }
.confidence-fill.low { background: var(--danger); }

/* ── Premium Box ──────────────────────────────────────────────────── */
.premium-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.premium-box h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.premium-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
}

.premium-item label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.25rem;
}

.premium-item .value {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
}

.premium-item .value.highlight { color: var(--accent); }

.premium-item .value-small {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
}

/* ── Comparison Grid ──────────────────────────────────────────────── */
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.comp-state {
    text-align: center;
    font-size: 1rem;
    font-weight: 700;
    padding: 0.75rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.comp-state.mn { background: rgba(74,80,168,0.08); color: var(--mn-color); }
.comp-state.ga { background: rgba(200,106,26,0.08); color: var(--ga-color); }

.comp-column .agent-step {
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
}

.comp-column .step-details {
    grid-column: 1 / -1;
}

/* ── Contrast Box ─────────────────────────────────────────────────── */
.contrast-box {
    background: linear-gradient(135deg, #eef1f7 0%, #e8ecf5 100%);
    border: 1px solid var(--accent-dim);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.contrast-box h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    margin-bottom: 1rem;
}

.contrast-box ul {
    list-style: none;
    display: grid;
    gap: 0.5rem;
}

.contrast-box li {
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-left: 1.25rem;
    position: relative;
}

.contrast-box li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.5em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

/* ── Decision Log ─────────────────────────────────────────────────── */
.decision-log {
    margin-top: 1.5rem;
}

.decision-log h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.decision-log h3:hover { color: var(--text); }

.log-entries {
    display: none;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.log-entries.open { display: block; }

.log-entry {
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
}

.log-entry:last-child { border-bottom: none; }

.log-entry .log-agent {
    font-weight: 600;
    color: var(--accent);
    margin-right: 0.5rem;
}

.log-entry .log-decision {
    font-weight: 600;
    margin-right: 0.5rem;
}

.log-entry .log-reasoning {
    color: var(--text-muted);
    display: block;
    margin-top: 0.25rem;
    font-size: 0.75rem;
    line-height: 1.5;
}

.log-entry .log-rules {
    color: var(--text-muted);
    font-size: 0.7rem;
    font-style: italic;
    margin-top: 0.2rem;
}

/* ── Thesis Banner ────────────────────────────────────────────────── */
.thesis-banner {
    text-align: center;
    padding: 2rem;
    margin: 2rem 0;
    background: linear-gradient(135deg, rgba(184,153,62,0.05) 0%, rgba(184,153,62,0.1) 100%);
    border: 1px solid var(--accent-dim);
    border-radius: var(--radius-lg);
}

.thesis-banner p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text);
}

.thesis-banner strong { color: var(--accent); }

/* ── Footer ───────────────────────────────────────────────────────── */
footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border);
    margin-top: 3rem;
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* ── Responsive ───────────────────────────────────────────────────── */
@media (max-width: 900px) {
    .comparison-grid { grid-template-columns: 1fr; }
    .agent-step { grid-template-columns: 1fr auto; grid-template-rows: auto auto; }
    .agent-step .step-details { grid-column: 1 / -1; }
    .scenario-cards { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
    .scenario-cards { grid-template-columns: 1fr; }
    main { padding: 1rem; }
}

/* ── Animations ───────────────────────────────────────────────────── */
.agent-step.animate {
    animation: fadeInUp 0.3s ease forwards;
}

.agent-step.animate:nth-child(1) { animation-delay: 0.05s; }
.agent-step.animate:nth-child(2) { animation-delay: 0.1s; }
.agent-step.animate:nth-child(3) { animation-delay: 0.15s; }
.agent-step.animate:nth-child(4) { animation-delay: 0.2s; }
.agent-step.animate:nth-child(5) { animation-delay: 0.25s; }
.agent-step.animate:nth-child(6) { animation-delay: 0.3s; }
.agent-step.animate:nth-child(7) { animation-delay: 0.35s; }
.agent-step.animate:nth-child(8) { animation-delay: 0.4s; }

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}