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

:root {
    --bg: #f5f6fa;
    --surface: #ffffff;
    --text: #1a1a2e;
    --text-muted: #6b7280;
    --accent: #4f46e5;
    --accent-light: #e0e7ff;
    --accent-hover: #4338ca;
    --border: #e5e7eb;
    --success: #059669;
    --success-light: #d1fae5;
    --warning: #d97706;
    --warning-light: #fef3c7;
    --danger: #dc2626;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}

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 {
    text-align: center;
    padding: 2.5rem 1rem 1.5rem;
}
header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}
.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

/* ── Layout ── */
main {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1.25rem 3rem;
}

.input-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 1.25rem;
}

@media (max-width: 768px) {
    .input-panels { grid-template-columns: 1fr; }
}

/* ── Cards ── */
.card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
}
.card-header h2 {
    font-size: 1rem;
    font-weight: 600;
}
.card-body {
    padding: 1.25rem;
}

/* ── Form Elements ── */
.name-input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    transition: border-color 0.15s;
}
.name-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.slots-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.slot-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.5rem;
    background: var(--bg);
    border-radius: var(--radius-sm);
}

.day-select, .time-start, .time-end {
    padding: 0.35rem 0.5rem;
    border: 1.5px solid var(--border);
    border-radius: 6px;
    font-size: 0.82rem;
    background: var(--surface);
}
.day-select { width: 70px; }
.time-start, .time-end { width: 100px; }
.time-sep { font-size: 0.8rem; color: var(--text-muted); }

.day-select:focus, .time-start:focus, .time-end:focus {
    outline: none;
    border-color: var(--accent);
}

/* ── Buttons ── */
.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.7rem 2rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:active { transform: scale(0.98); }

.btn-secondary {
    background: none;
    border: 1.5px dashed var(--border);
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    font-size: 0.82rem;
    color: var(--accent);
    cursor: pointer;
    transition: background 0.15s;
}
.btn-secondary:hover { background: var(--accent-light); }

.btn-small { padding: 0.3rem 0.6rem; font-size: 0.78rem; }

.btn-icon {
    background: none;
    border: none;
    font-size: 1.1rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.15rem 0.35rem;
    border-radius: 4px;
    line-height: 1;
}
.btn-icon:hover { background: #fee2e2; color: var(--danger); }

.btn-remove-interviewer {
    background: none;
    border: 1px solid var(--border);
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--danger);
    cursor: pointer;
}
.btn-remove-interviewer:hover { background: #fee2e2; }

/* ── Interviewer Cards ── */
.interviewer-entry {
    background: var(--bg);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    margin-bottom: 0.75rem;
}
.interviewer-entry .entry-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}
.interviewer-entry .name-input {
    margin-bottom: 0.5rem;
    background: var(--surface);
}

/* ── Controls ── */
.controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 0 0.25rem;
}
.duration-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.88rem;
    color: var(--text-muted);
}
.duration-control select {
    padding: 0.4rem 0.6rem;
    border: 1.5px solid var(--border);
    border-radius: 6px;
    font-size: 0.85rem;
}

/* ── Results ── */
.results-section {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}
.hidden { display: none !important; }

/* Recommendation */
.recommendation-card {
    border-left: 4px solid var(--success);
}
.recommendation-card .card-header { background: var(--success-light); }

.rec-slot {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.5rem;
}
.rec-reasoning {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}
.rec-interviewers {
    margin-top: 0.5rem;
    font-size: 0.85rem;
}
.rec-interviewers span {
    display: inline-block;
    background: var(--accent-light);
    color: var(--accent);
    padding: 0.15rem 0.5rem;
    border-radius: 20px;
    margin: 0.15rem 0.2rem;
    font-size: 0.8rem;
}

/* Slot cards */
.slot-card {
    display: flex;
    align-items: stretch;
    background: var(--bg);
    border-radius: var(--radius-sm);
    margin-bottom: 0.6rem;
    overflow: hidden;
}
.slot-rank {
    width: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    color: white;
}
.rank-1 { background: #f59e0b; }
.rank-2 { background: #9ca3af; }
.rank-3 { background: #b45309; }

.slot-details {
    padding: 0.75rem 1rem;
    flex: 1;
}
.slot-time {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}
.slot-meta {
    font-size: 0.82rem;
    color: var(--text-muted);
}
.slot-meta .available { color: var(--success); }
.slot-meta .missing { color: var(--warning); }

/* Conflicts */
.conflicts-card { border-left: 4px solid var(--warning); }
.conflicts-card .card-header { background: var(--warning-light); }
.conflict-item {
    padding: 0.5rem 0;
    font-size: 0.88rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}
.conflict-item:last-child { border-bottom: none; }
.conflict-icon { margin-right: 0.4rem; }

/* No results */
.no-results {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}
.no-results h3 { margin-bottom: 0.5rem; color: var(--danger); }

/* ── Loading ── */
.btn-primary.loading {
    opacity: 0.7;
    pointer-events: none;
}