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

:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #161d2e;
    --accent: #00d4aa;
    --accent-dim: rgba(0, 212, 170, 0.12);
    --accent-glow: rgba(0, 212, 170, 0.25);
    --text-primary: #e8ecf4;
    --text-secondary: #8b95a8;
    --text-dim: #5a6478;
    --border: rgba(255, 255, 255, 0.06);
    --border-focus: rgba(0, 212, 170, 0.4);
    --danger: #ff6b6b;
    --warning: #ffd43b;
    --success: #00d4aa;
}

body {
    font-family: 'DM Sans', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

.accent { color: var(--accent); }
.req { color: var(--danger); font-size: 0.75rem; }

/* NAV */
nav {
    position: fixed; top: 0; width: 100%; z-index: 100;
    padding: 1rem 2rem; display: flex; align-items: center;
    justify-content: space-between;
    background: rgba(10, 14, 23, 0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}
.nav-logo {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700; font-size: 1.25rem;
    color: var(--text-primary); text-decoration: none;
    letter-spacing: -0.02em;
}
.nav-logo span { color: var(--accent); }
.nav-right { display: flex; gap: 0.25rem; }
.nav-tab {
    background: transparent; border: none; color: var(--text-secondary);
    font-family: 'DM Sans', sans-serif; font-size: 0.85rem;
    font-weight: 500; padding: 0.5rem 1rem; border-radius: 8px;
    cursor: pointer; transition: all 0.2s;
}
.nav-tab:hover { color: var(--text-primary); }
.nav-tab.active {
    color: var(--accent); background: var(--accent-dim);
}

/* MAIN */
main {
    max-width: 900px; margin: 0 auto;
    padding: 5.5rem 1.5rem 4rem;
}
.page-header { margin-bottom: 2rem; }
.page-header h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem; font-weight: 700;
    letter-spacing: -0.02em; margin-bottom: 0.4rem;
}
.subtitle {
    color: var(--text-secondary); font-size: 0.95rem; line-height: 1.5;
}

/* TABS */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* FORM */
.form-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;
    margin-bottom: 1.5rem;
}
.form-section {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 14px; padding: 1.5rem;
}
.form-section.full-width {
    grid-column: 1 / -1; margin-bottom: 1.5rem;
}
.section-label {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem; text-transform: uppercase;
    letter-spacing: 0.1em; color: var(--accent);
    margin-bottom: 1.2rem; font-weight: 600;
}

.field { margin-bottom: 1rem; }
.field:last-child { margin-bottom: 0; }
.field label {
    display: block; font-size: 0.82rem; font-weight: 500;
    color: var(--text-secondary); margin-bottom: 0.35rem;
}
.field input, .field textarea, .field select {
    width: 100%; background: var(--bg-primary);
    border: 1px solid var(--border); border-radius: 8px;
    padding: 0.7rem 0.9rem; color: var(--text-primary);
    font-family: 'DM Sans', sans-serif; font-size: 0.9rem;
    transition: border-color 0.2s; outline: none;
}
.field input::placeholder, .field textarea::placeholder {
    color: var(--text-dim);
}
.field input:focus, .field textarea:focus {
    border-color: var(--border-focus);
}
.field textarea { resize: vertical; min-height: 60px; }

.field-row {
    display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem;
    margin-bottom: 1rem;
}

/* BUTTONS */
.btn-primary {
    background: var(--accent); color: var(--bg-primary);
    padding: 0.85rem 2rem; border-radius: 10px;
    font-weight: 600; font-size: 0.95rem;
    border: none; cursor: pointer; display: inline-flex;
    align-items: center; gap: 0.5rem;
    transition: all 0.2s; font-family: 'DM Sans', sans-serif;
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-large { width: 100%; justify-content: center; padding: 1rem; font-size: 1rem; }
.btn-secondary {
    background: transparent; color: var(--text-primary);
    padding: 0.7rem 1.4rem; border-radius: 8px;
    font-weight: 500; font-size: 0.88rem;
    border: 1px solid rgba(255,255,255,0.1);
    cursor: pointer; transition: all 0.2s;
    font-family: 'DM Sans', sans-serif;
}
.btn-secondary:hover { border-color: rgba(255,255,255,0.2); }
.btn-small { padding: 0.45rem 1rem; font-size: 0.8rem; margin-bottom: 1.5rem; }

.spinner { animation: spin 1s linear infinite; }
@keyframes spin { 100% { transform: rotate(360deg); } }

/* RESULTS */
.results-header { margin: 3rem 0 1.5rem; }
.results-header h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.6rem; font-weight: 700;
    letter-spacing: -0.02em; margin-bottom: 0.4rem;
}

.overview-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 14px; padding: 1.25rem 1.5rem; margin-bottom: 1.5rem;
}
.overview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.overview-item { text-align: center; }
.overview-label {
    display: block; font-size: 0.72rem; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--text-dim);
    margin-bottom: 0.3rem; font-weight: 500;
}
.overview-value {
    font-family: 'Space Grotesk', sans-serif; font-weight: 600; font-size: 0.95rem;
}

.rec-grid { display: flex; flex-direction: column; gap: 1rem; }
.rec-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 14px; padding: 1.5rem; transition: border-color 0.3s;
}
.rec-card:hover { border-color: var(--accent-glow); }
.rec-card.rank-1 { border-color: rgba(0, 212, 170, 0.3); }

.rec-header {
    display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem;
}
.rec-rank {
    font-family: 'Space Grotesk', sans-serif; font-weight: 700;
    font-size: 0.7rem; text-transform: uppercase;
    letter-spacing: 0.1em; color: var(--accent);
    background: var(--accent-dim); padding: 0.25rem 0.7rem; border-radius: 100px;
}
.rec-confidence { font-family: 'JetBrains Mono', monospace; font-weight: 500; font-size: 0.85rem; }
.confidence-high { color: var(--success); }
.confidence-mid { color: var(--warning); }
.confidence-low { color: var(--danger); }

.rec-name {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.15rem; font-weight: 600; margin-bottom: 0.3rem;
}
.rec-type {
    font-size: 0.78rem; color: var(--text-dim);
    text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 1rem;
}

.rec-metrics {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem; margin-bottom: 1rem;
}
.metric { background: var(--bg-primary); border-radius: 8px; padding: 0.6rem 0.8rem; }
.metric-label {
    font-size: 0.68rem; text-transform: uppercase;
    letter-spacing: 0.06em; color: var(--text-dim);
    margin-bottom: 0.15rem; font-weight: 500;
}
.metric-value { font-family: 'JetBrains Mono', monospace; font-size: 0.95rem; font-weight: 500; }

.rec-reasoning {
    color: var(--text-secondary); font-size: 0.88rem; line-height: 1.6;
    margin-bottom: 1rem; padding-top: 0.75rem; border-top: 1px solid var(--border);
}

.sensitivity { margin-top: 0.75rem; }
.sensitivity-title {
    font-size: 0.72rem; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--text-dim);
    margin-bottom: 0.6rem; font-weight: 600;
}
.sensitivity-row {
    display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.4rem;
}
.sensitivity-label { font-size: 0.78rem; color: var(--text-secondary); width: 90px; flex-shrink: 0; }
.sensitivity-bar {
    flex: 1; height: 6px; background: rgba(255,255,255,0.04);
    border-radius: 3px; overflow: hidden;
}
.sensitivity-fill { height: 100%; border-radius: 3px; transition: width 0.6s ease; }
.sensitivity-fill.low { background: var(--success); width: 30%; }
.sensitivity-fill.medium { background: var(--warning); width: 60%; }
.sensitivity-fill.high { background: var(--danger); width: 90%; }
.sensitivity-impact { font-size: 0.72rem; font-weight: 500; width: 55px; text-align: right; }
.sensitivity-impact.low { color: var(--success); }
.sensitivity-impact.medium { color: var(--warning); }
.sensitivity-impact.high { color: var(--danger); }

/* HISTORY */
.history-list { display: flex; flex-direction: column; gap: 0.75rem; }
.history-item {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 12px; padding: 1rem 1.25rem;
    display: flex; align-items: center; justify-content: space-between;
    cursor: pointer; transition: border-color 0.2s;
}
.history-item:hover { border-color: var(--accent-glow); }
.history-left { display: flex; flex-direction: column; gap: 0.2rem; }
.history-title { font-weight: 600; font-size: 0.95rem; }
.history-meta { font-size: 0.78rem; color: var(--text-dim); }
.history-status {
    font-size: 0.72rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: 0.06em; padding: 0.2rem 0.6rem; border-radius: 100px;
}
.status-completed { color: var(--success); background: rgba(0, 212, 170, 0.1); }
.status-processing { color: var(--warning); background: rgba(255, 212, 59, 0.1); }
.status-failed { color: var(--danger); background: rgba(255, 107, 107, 0.1); }

.empty-state {
    text-align: center; padding: 3rem; color: var(--text-dim); font-size: 0.95rem;
}

.error-toast {
    position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%);
    background: #2d1b1b; border: 1px solid rgba(255, 107, 107, 0.3);
    color: var(--danger); padding: 0.8rem 1.5rem;
    border-radius: 10px; font-size: 0.88rem; font-weight: 500;
    z-index: 200; animation: slideUp 0.3s ease;
}
@keyframes slideUp {
    from { opacity: 0; transform: translateX(-50%) translateY(10px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@media (max-width: 768px) {
    .form-grid { grid-template-columns: 1fr; }
    .overview-grid { grid-template-columns: 1fr; }
    .rec-metrics { grid-template-columns: repeat(2, 1fr); }
    main { padding-left: 1rem; padding-right: 1rem; }
}