/* ===== Modern Red Design System ===== */
:root {
    --color-bg: #0d0d0f;
    --color-bg-2: #111114;
    --color-surface: #18181c;
    --color-surface-2: #1f1f24;
    --color-surface-3: #26262c;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-light: rgba(255, 255, 255, 0.05);
    --color-text: #f5f5f7;
    --color-text-secondary: rgba(245, 245, 247, 0.55);
    --color-text-tertiary: rgba(245, 245, 247, 0.35);

    --color-red: #e63030;
    --color-red-2: #ff4545;
    --color-red-dim: rgba(230, 48, 48, 0.12);
    --color-red-glow: rgba(230, 48, 48, 0.25);
    --grad-red: linear-gradient(135deg, #e63030 0%, #b01c1c 100%);
    --grad-hero: linear-gradient(160deg, #1a0a0a 0%, #0d0d0f 40%, #0d0d0f 100%);

    --color-income: #34d399;
    --color-income-dim: rgba(52, 211, 153, 0.12);
    --color-expense: #e63030;
    --color-expense-dim: rgba(230, 48, 48, 0.12);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-red: 0 8px 32px rgba(230, 48, 48, 0.25);
    --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.6);

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Noto Sans Thai', 'Helvetica Neue', sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    letter-spacing: -0.01em;
    min-height: 100vh;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, select { font-family: inherit; color: var(--color-text); }
input::placeholder { color: var(--color-text-tertiary); }
select option { background: var(--color-surface-2); }

/* ===== Navbar ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 13, 15, 0.85);
    backdrop-filter: saturate(180%) blur(24px);
    -webkit-backdrop-filter: saturate(180%) blur(24px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 28px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-logo svg { color: var(--color-red-2); }

.nav-logo span {
    background: linear-gradient(90deg, #f5f5f7 0%, rgba(245,245,247,0.7) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-tabs { display: flex; gap: 2px; }

.nav-tab {
    padding: 8px 18px;
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text-secondary);
    border-radius: 980px;
    transition: all var(--transition);
}

.nav-tab:hover { color: var(--color-text); background: var(--color-surface-3); }

.nav-tab.active {
    color: var(--color-text);
    font-weight: 500;
    background: var(--color-surface-3);
}

/* ===== Main ===== */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 56px 28px 100px;
}

.tab-section { display: none; animation: fadeUp 0.4s cubic-bezier(0.4,0,0.2,1); }
.tab-section.active { display: block; }

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ===== Hero ===== */
.hero {
    position: relative;
    text-align: center;
    padding: 48px 0 72px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 300px;
    background: radial-gradient(ellipse, rgba(230,48,48,0.18) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero-eyebrow {
    position: relative;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-red-2);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.hero-title {
    position: relative;
    font-size: 88px;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1;
    margin-bottom: 16px;
    background: linear-gradient(160deg, #ffffff 30%, rgba(255,255,255,0.5) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    position: relative;
    font-size: 17px;
    color: var(--color-text-secondary);
}

/* ===== Page Header ===== */
.page-header {
    text-align: center;
    margin-bottom: 48px;
}

.page-title {
    font-size: 52px;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
    background: linear-gradient(160deg, #fff 40%, rgba(255,255,255,0.55) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle { font-size: 19px; color: var(--color-text-secondary); }

.section-title {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    color: var(--color-text);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
.section-header .section-title { margin-bottom: 0; }

/* ===== Summary Grid ===== */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 40px;
}

.summary-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    display: flex;
    align-items: center;
    gap: 18px;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.summary-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0;
    transition: opacity var(--transition);
}

.summary-card.income::before { background: var(--color-income-dim); }
.summary-card.expense::before { background: var(--color-expense-dim); }
.summary-card.count::before { background: rgba(230,48,48,0.06); }

.summary-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: rgba(255,255,255,0.12); }
.summary-card:hover::before { opacity: 1; }

.summary-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.summary-card.income .summary-icon { background: var(--color-income-dim); color: var(--color-income); }
.summary-card.expense .summary-icon { background: var(--color-expense-dim); color: var(--color-expense); }
.summary-card.count .summary-icon { background: var(--color-red-dim); color: var(--color-red-2); }

.summary-label { font-size: 13px; color: var(--color-text-secondary); margin-bottom: 4px; }
.summary-value { font-size: 26px; font-weight: 700; letter-spacing: -0.02em; }

/* ===== Cards ===== */
.quick-add-card,
.recent-section,
.chart-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 36px;
    margin-bottom: 28px;
    border: 1px solid var(--color-border);
}

/* ===== Form ===== */
.add-form { display: flex; flex-direction: column; gap: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: 12px; font-weight: 600; color: var(--color-text-secondary); letter-spacing: 0.05em; text-transform: uppercase; }

.form-group input,
.form-group select,
.filter-group input,
.filter-group select {
    padding: 13px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface-2);
    transition: all var(--transition);
    font-size: 15px;
    width: 100%;
    color: var(--color-text);
    -webkit-appearance: none;
    appearance: none;
}

.form-group input:focus,
.form-group select:focus,
.filter-group input:focus,
.filter-group select:focus {
    outline: none;
    border-color: var(--color-red);
    background: var(--color-surface-3);
    box-shadow: 0 0 0 3px var(--color-red-dim);
}

/* ===== Type Toggle ===== */
.type-toggle {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--color-surface-3);
    padding: 4px;
    border-radius: var(--radius-md);
    gap: 4px;
}

.type-btn, .cat-type-btn {
    padding: 10px 16px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.type-btn.active, .cat-type-btn.active {
    background: var(--grad-red);
    color: #fff;
    box-shadow: 0 2px 12px var(--color-red-glow);
}

/* ===== Buttons ===== */
.btn-primary {
    background: var(--grad-red);
    color: #fff;
    padding: 14px 32px;
    border-radius: 980px;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition: all var(--transition);
    align-self: flex-start;
    box-shadow: 0 4px 16px var(--color-red-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-red);
    filter: brightness(1.1);
}

.btn-secondary {
    background: var(--color-surface-3);
    color: var(--color-text);
    padding: 11px 22px;
    border-radius: 980px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.btn-secondary:hover { background: var(--color-surface-2); border-color: rgba(255,255,255,0.12); }

.btn-link {
    color: var(--color-red-2);
    font-size: 14px;
    font-weight: 500;
    transition: opacity var(--transition);
}
.btn-link:hover { opacity: 0.7; }

/* ===== Transaction List ===== */
.transaction-list { display: flex; flex-direction: column; gap: 8px; }

.transaction-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.transaction-item:hover {
    background: var(--color-surface-3);
    border-color: rgba(255,255,255,0.1);
    transform: translateX(2px);
}

.tx-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.tx-icon.income { background: var(--color-income-dim); }
.tx-icon.expense { background: var(--color-expense-dim); }

.tx-info { flex: 1; min-width: 0; }
.tx-category { font-size: 15px; font-weight: 600; color: var(--color-text); margin-bottom: 3px; }
.tx-meta { font-size: 13px; color: var(--color-text-tertiary); }

.tx-amount { font-size: 16px; font-weight: 700; letter-spacing: -0.02em; }
.tx-amount.income { color: var(--color-income); }
.tx-amount.expense { color: var(--color-red-2); }

.tx-delete {
    color: var(--color-text-tertiary);
    padding: 8px;
    border-radius: 8px;
    transition: all var(--transition);
    display: flex;
    align-items: center;
}
.tx-delete:hover { background: var(--color-expense-dim); color: var(--color-red-2); }

.empty-state {
    text-align: center;
    padding: 56px 24px;
    color: var(--color-text-tertiary);
    font-size: 15px;
}

/* ===== Filter Bar ===== */
.filter-bar {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 22px;
    margin-bottom: 24px;
    border: 1px solid var(--color-border);
    display: grid;
    grid-template-columns: repeat(4, 1fr) auto;
    gap: 16px;
    align-items: end;
}

.filter-group { display: flex; flex-direction: column; gap: 6px; }
.filter-group label { font-size: 11px; font-weight: 600; color: var(--color-text-secondary); letter-spacing: 0.06em; text-transform: uppercase; }
.filter-bar .btn-secondary { height: 46px; }

/* ===== Period Toggle ===== */
.period-toggle {
    display: flex;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 4px;
    border-radius: 980px;
    margin: 0 auto 36px;
    width: fit-content;
    gap: 4px;
}

.period-btn {
    padding: 10px 28px;
    border-radius: 980px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.period-btn.active {
    background: var(--grad-red);
    color: #fff;
    box-shadow: 0 2px 12px var(--color-red-glow);
}

/* ===== Report Summary ===== */
.report-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

.report-stat {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 28px;
    text-align: center;
    border: 1px solid var(--color-border);
}

.report-label { font-size: 12px; font-weight: 600; color: var(--color-text-secondary); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 12px; }
.report-value { font-size: 32px; font-weight: 800; letter-spacing: -0.025em; }

.income-text { color: var(--color-income); }
.expense-text { color: var(--color-red-2); }

/* ===== Charts ===== */
.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.chart-card { margin-bottom: 0; }

.chart-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--color-text);
}

.chart-wrapper { position: relative; height: 300px; }

/* ===== Categories ===== */
.categories-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.category-column {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 32px;
    border: 1px solid var(--color-border);
}

.category-list { display: flex; flex-direction: column; gap: 8px; }

.category-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background: var(--color-surface-2);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: all var(--transition);
}

.category-item:hover { background: var(--color-surface-3); border-color: var(--color-border); }

.cat-name { font-size: 15px; font-weight: 500; }

.cat-delete {
    color: var(--color-text-tertiary);
    padding: 6px;
    border-radius: 6px;
    transition: all var(--transition);
    display: flex;
}
.cat-delete:hover { background: var(--color-expense-dim); color: var(--color-red-2); }

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 36px;
    left: 50%;
    transform: translateX(-50%) translateY(120px);
    background: rgba(245, 245, 247, 0.96);
    color: #1d1d1f;
    padding: 14px 28px;
    border-radius: 980px;
    font-size: 14px;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all 0.45s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--color-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 9999;
    transition: opacity 0.4s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-surface-3);
    border-top-color: var(--color-red);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-text { font-size: 15px; color: var(--color-text-secondary); }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-surface-3); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-container { flex-direction: column; height: auto; padding: 12px 16px; gap: 12px; }
    .nav-tabs { width: 100%; overflow-x: auto; justify-content: flex-start; }
    .main-container { padding: 32px 16px 72px; }
    .hero-title { font-size: 60px; }
    .page-title { font-size: 40px; }
    .summary-grid, .report-summary, .charts-grid, .categories-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .filter-bar { grid-template-columns: 1fr 1fr; }
    .quick-add-card, .recent-section, .chart-card, .category-column { padding: 20px; }
}