/* Thần Số Học — thiết kế mới */
@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,400;0,500;0,600;0,700;1,400&family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&display=swap&subset=vietnamese');

:root {
    --bg: #faf8f5;
    --surface: #ffffff;
    --surface2: #f3efe8;
    --border: #e5dfd4;
    --text: #1a1625;
    --muted: #6b6578;
    --accent: #4f46a5;
    --accent-light: #ede9fe;
    --gold: #b45309;
    --gold-bg: #fffbeb;
    --green: #047857;
    --green-bg: #ecfdf5;
    --amber: #d97706;
    --amber-bg: #fff7ed;
    --radius: 16px;
    --shadow: 0 4px 24px rgba(26, 22, 37, 0.06);
    --shadow-lg: 0 12px 48px rgba(26, 22, 37, 0.1);
    --font: 'DM Sans', 'Be Vietnam Pro', system-ui, sans-serif;
    --font-display: 'Be Vietnam Pro', 'DM Sans', system-ui, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

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

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 50% at 20% -10%, rgba(79, 70, 165, 0.07), transparent),
        radial-gradient(ellipse 50% 40% at 90% 100%, rgba(180, 83, 9, 0.05), transparent);
    pointer-events: none;
    z-index: 0;
}

.app {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1.25rem 4rem;
    position: relative;
    z-index: 1;
}

/* Header */
.site-header {
    text-align: center;
    margin-bottom: 2rem;
}
.site-header h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 6vw, 2.75rem);
    font-weight: 700;
    color: var(--text);
    letter-spacing: normal;
}
.site-header h1 em {
    font-style: italic;
    font-weight: 600;
    color: var(--accent);
}
.site-header p {
    color: var(--muted);
    font-size: 0.95rem;
    margin-top: 0.35rem;
}

/* Input */
.input-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}
.input-row {
    display: flex;
    gap: 0.75rem;
}
.input-row input {
    flex: 1;
    padding: 0.9rem 1.1rem;
    font-size: 1.15rem;
    font-family: var(--font);
    text-align: center;
    letter-spacing: 0.05em;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: var(--surface2);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.input-row input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-light);
}
.input-row input.error {
    border-color: #dc2626;
    animation: shake 0.4s ease;
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}
.btn-primary {
    padding: 0.9rem 1.5rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 12px;
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.2s, transform 0.15s;
}
.btn-primary:hover { background: #4338ca; transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.input-hint {
    text-align: center;
    font-size: 0.82rem;
    color: var(--muted);
    margin-top: 0.75rem;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--muted);
}
.empty-icon {
    font-size: 3rem;
    opacity: 0.4;
    margin-bottom: 0.75rem;
}

/* Hero result */
.hero-card {
    background: linear-gradient(135deg, var(--accent) 0%, #6366f1 100%);
    color: white;
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}
.hero-card::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 200%;
    background: rgba(255,255,255,0.06);
    border-radius: 50%;
    pointer-events: none;
}
.hero-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    position: relative;
}
.hero-date { font-size: 0.9rem; opacity: 0.85; }
.hero-sum { font-size: 0.85rem; opacity: 0.7; }
.hero-number {
    font-family: var(--font-display);
    font-size: clamp(4rem, 15vw, 5.5rem);
    line-height: 1;
    position: relative;
}
.hero-number.master {
    background: linear-gradient(180deg, #fde68a, #fbbf24);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-label {
    font-family: var(--font-display);
    font-size: 1.35rem;
    margin-top: 0.5rem;
    position: relative;
}
.hero-tagline {
    opacity: 0.9;
    font-size: 0.95rem;
    margin-top: 0.25rem;
    position: relative;
}
.hero-day {
    margin-top: 1rem;
    font-size: 0.82rem;
    opacity: 0.75;
    position: relative;
}

/* Stats */
.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}
.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    text-align: center;
}
.stat-val {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--accent);
}
.stat-label {
    font-size: 0.75rem;
    color: var(--muted);
    margin-top: 0.15rem;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    background: var(--surface2);
    padding: 0.35rem;
    border-radius: 12px;
}
.tab-btn {
    flex: 1;
    padding: 0.6rem;
    border: none;
    background: transparent;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--muted);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}
.tab-btn.active {
    background: var(--surface);
    color: var(--accent);
    box-shadow: var(--shadow);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeUp 0.35s ease; }
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Section card */
.section-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}
.section-title {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    margin-bottom: 1rem;
    font-weight: 600;
}

/* Planes */
.planes-grid { display: flex; flex-direction: column; gap: 0.75rem; }
.plane-card {
    padding: 1rem;
    background: var(--surface2);
    border-radius: 12px;
    border: 1px solid transparent;
}
.plane-card.dominant {
    border-color: var(--accent);
    background: var(--accent-light);
}
.plane-card-head {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}
.plane-name { font-weight: 600; font-size: 0.9rem; }
.plane-val { font-family: var(--font-display); color: var(--accent); }
.plane-bar {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}
.plane-bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 3px;
    transition: width 0.5s ease;
}
.plane-desc { font-size: 0.82rem; color: var(--muted); }

/* Chart */
.chart-wrap { text-align: center; }
.chart-grid {
    display: inline-grid;
    grid-template-columns: repeat(3, 88px);
    gap: 6px;
    margin: 0.5rem 0;
}
.chart-cell {
    width: 88px;
    height: 88px;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: var(--surface2);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.2rem;
    transition: all 0.2s;
    font-family: var(--font);
}
.chart-cell.filled {
    background: var(--accent-light);
    border-color: var(--accent);
}
.chart-cell.empty {
    opacity: 0.45;
}
.chart-cell.active {
    transform: scale(1.05);
    box-shadow: 0 0 0 3px var(--accent-light);
}
.chart-cell:hover { transform: scale(1.03); }
.cell-num {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 400;
}
.cell-meta {
    font-size: 0.65rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.chart-legend {
    font-size: 0.78rem;
    color: var(--muted);
    margin-top: 0.5rem;
}

/* Detail blocks */
.detail-block { margin-bottom: 1.25rem; }
.detail-block:last-child { margin-bottom: 0; }
.detail-block h4 {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 0.4rem;
}
.detail-block p { color: var(--text); font-size: 0.92rem; }
.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.25rem;
}
@media (max-width: 560px) { .detail-grid { grid-template-columns: 1fr; } }
.detail-block.positive {
    background: var(--green-bg);
    padding: 1rem;
    border-radius: 12px;
}
.detail-block.positive h4 { color: var(--green); }
.detail-block.caution {
    background: var(--amber-bg);
    padding: 1rem;
    border-radius: 12px;
}
.detail-block.caution h4 { color: var(--amber); }

/* Number cards */
.num-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.15rem;
    margin-bottom: 0.75rem;
    transition: box-shadow 0.3s;
}
.num-card.flash {
    box-shadow: 0 0 0 3px var(--accent-light);
}
.num-card-head {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    margin-bottom: 0.6rem;
}
.num-badge {
    background: var(--accent);
    color: white;
    padding: 0.35rem 0.65rem;
    border-radius: 8px;
    font-family: var(--font-display);
    font-size: 1.1rem;
    min-width: 2.5rem;
    text-align: center;
}
.num-plane {
    display: block;
    font-size: 0.78rem;
    color: var(--muted);
    font-weight: 400;
}
.num-card p { font-size: 0.88rem; color: var(--muted); }

.section-intro {
    font-size: 0.85rem;
    color: var(--muted);
    margin: -0.5rem 0 1rem;
    line-height: 1.55;
}

.analysis-body { margin-top: 0.25rem; }
.analysis-title {
    font-size: 0.95rem;
    color: var(--accent);
    margin-bottom: 0.6rem;
    font-weight: 600;
}
.analysis-p {
    font-size: 0.88rem;
    color: #4a4458;
    margin-bottom: 0.65rem;
    line-height: 1.65;
}
.analysis-p:last-of-type { margin-bottom: 0.5rem; }
.analysis-advice {
    background: var(--green-bg);
    border-radius: 10px;
    padding: 0.85rem 1rem;
    font-size: 0.85rem;
    color: #065f46;
    line-height: 1.6;
    margin-top: 0.75rem;
}
.analysis-advice strong { display: block; margin-bottom: 0.25rem; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }
.analysis-note {
    font-size: 0.8rem;
    color: var(--muted);
    font-style: italic;
    margin-top: 0.65rem;
    padding-left: 0.75rem;
    border-left: 2px solid var(--border);
}
.analysis-more {
    font-size: 0.82rem;
    color: var(--accent);
    margin-top: 0.5rem;
}

.missing-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 0.85rem;
    background: var(--gold-bg);
}
.missing-card:last-child { margin-bottom: 0; }
.missing-card-head {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    margin-bottom: 0.5rem;
}
.missing-card .analysis-advice {
    background: var(--surface);
    color: var(--text);
}

/* Missing */
.missing-item {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
}
.missing-item:last-child { border-bottom: none; padding-bottom: 0; }
.missing-num {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gold-bg);
    color: var(--gold);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}
.missing-item p {
    font-size: 0.85rem;
    color: var(--muted);
    margin-top: 0.2rem;
}

/* Isolated */
.isolated-item {
    background: var(--amber-bg);
    border-left: 3px solid var(--amber);
    padding: 1rem;
    border-radius: 0 10px 10px 0;
    margin-bottom: 0.5rem;
}
.isolated-item p { font-size: 0.88rem; color: #92400e; }

/* Method */
.method-card {
    background: var(--surface2);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-top: 1.5rem;
}
.method-card h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}
.method-card ol {
    margin-left: 1.25rem;
    color: var(--muted);
    font-size: 0.88rem;
}
.method-card li { margin-bottom: 0.35rem; }
.method-card .mini-grid {
    display: inline-grid;
    grid-template-columns: repeat(3, 32px);
    gap: 3px;
    margin: 0.75rem 0;
    font-size: 0.8rem;
    font-weight: 600;
}
.method-card .mini-grid span {
    width: 32px; height: 32px;
    display: flex; align-items: center; justify-content: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
}

.hidden { display: none !important; }

.site-footer {
    text-align: center;
    font-size: 0.78rem;
    color: var(--muted);
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

@media print {
    .input-card, .tabs, .btn-primary, .site-footer { display: none; }
    .hero-card { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}

@media (max-width: 480px) {
    .input-row { flex-direction: column; }
    .chart-grid { grid-template-columns: repeat(3, 1fr); }
    .chart-cell { width: 100%; height: 72px; }
    .stats-row { grid-template-columns: 1fr; }
}