/* Calendar Converter - QuizzMan Tools */
/* Modern CSS with GPU Optimization & QMF Design System */

:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-light: rgba(59, 130, 246, 0.1);
    --primary-glow: rgba(59, 130, 246, 0.25);
    --secondary: #8b5cf6;
    --secondary-light: rgba(139, 92, 246, 0.1);
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --solar-color: #f59e0b;
    --solar-light: rgba(245, 158, 11, 0.1);
    --lunar-color: #8b5cf6;
    --lunar-light: rgba(139, 92, 246, 0.1);
    --text: #1e293b;
    --text-secondary: #64748b;
    --bg: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.2);
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.dark-mode {
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --bg: #0f172a;
    --surface: #1e293b;
    --border: #334155;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.15);
}

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

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

/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    contain: layout style;
}

.dark-mode header {
    background: rgba(30, 41, 59, 0.9);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo {
    height: 40px;
    width: auto;
    transition: transform var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

.site-title {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.nav-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--primary-light);
    color: var(--primary);
    text-decoration: none;
    font-size: 1rem;
    transition: all var(--transition);
}

.nav-link:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

#theme-btn, #lang-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 10px;
    background: var(--primary-light);
    color: var(--primary);
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    position: relative;
}

#lang-btn {
    width: auto;
    padding: 0 0.75rem;
}

#lang-text {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

#theme-btn:hover, #lang-btn:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Page Title */
.page-title {
    text-align: center;
    margin-bottom: 2rem;
}

.page-title.compact {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    margin-bottom: 1.5rem;
}

.page-title.compact h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.page-title.compact h1 i {
    color: var(--primary);
}

.page-title.compact .about-link {
    margin: 0;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.title-icon {
    position: relative;
    display: inline-block;
    width: 80px;
    height: 80px;
    margin-bottom: 1rem;
}

.title-icon i {
    position: absolute;
    font-size: 3rem;
}

.title-icon i:first-child {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--primary);
    animation: float 3s ease-in-out infinite;
}

.title-icon .overlay-icon {
    top: 60%;
    left: 65%;
    transform: translate(-50%, -50%);
    font-size: 1.75rem;
    color: var(--secondary);
    animation: float 3s ease-in-out infinite 0.5s;
}

@keyframes float {
    0%, 100% { transform: translate(-50%, -50%) translateY(0); }
    50% { transform: translate(-50%, -50%) translateY(-8px); }
}

.page-title h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.page-title p {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.about-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border: 2px solid transparent;
    background-clip: padding-box;
    border-radius: 50px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition);
    position: relative;
}

.about-link::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition);
}

.about-link:hover {
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);
}

.about-link:hover::before {
    opacity: 1;
}

.about-link i {
    font-size: 1.1rem;
}

/* Mode Tabs */
.mode-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    background: var(--surface);
    padding: 0.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.mode-tab {
    flex: 1;
    padding: 0.875rem 1rem;
    border: none;
    border-radius: var(--radius);
    background: transparent;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.mode-tab:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.mode-tab.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.mode-tab i {
    font-size: 1rem;
}

/* Converter Card */
.converter-card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    padding: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.converter-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--solar-color), var(--lunar-color));
}

/* Conversion Panel */
.conversion-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.conversion-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.panel-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.panel-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.panel-icon.solar {
    background: var(--solar-light);
    color: var(--solar-color);
}

.panel-icon.lunar {
    background: var(--lunar-light);
    color: var(--lunar-color);
}

.panel-icon.today {
    background: var(--primary-light);
    color: var(--primary);
}

.panel-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.panel-header p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Input Section */
.input-section {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.date-inputs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.input-group label i {
    color: var(--primary);
    font-size: 0.8rem;
}

.input-group select,
.input-group input {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text);
    background: var(--surface);
    transition: all var(--transition);
    cursor: pointer;
}

.input-group select:focus,
.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}

.input-group input[type="number"] {
    -moz-appearance: textfield;
}

.input-group input[type="number"]::-webkit-outer-spin-button,
.input-group input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

/* Leap Month Option */
.leap-month-option {
    margin-bottom: 1.5rem;
}

.checkbox-option {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
}

.checkbox-option:hover {
    border-color: var(--primary);
}

.checkbox-option input {
    display: none;
}

.checkmark {
    width: 22px;
    height: 22px;
    border: 2px solid var(--border);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.checkmark::after {
    content: '✓';
    font-size: 14px;
    color: white;
    opacity: 0;
    transform: scale(0);
    transition: all var(--transition);
}

.checkbox-option input:checked + .checkmark {
    background: var(--primary);
    border-color: var(--primary);
}

.checkbox-option input:checked + .checkmark::after {
    opacity: 1;
    transform: scale(1);
}

/* Today Display */
.today-display {
    text-align: center;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.today-solar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.today-solar .day-number {
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.today-solar .month-year {
    font-size: 1.25rem;
    color: var(--text);
    font-weight: 600;
}

.today-solar .weekday {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Convert Button */
.convert-btn {
    width: 100%;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    position: relative;
    overflow: hidden;
}

.convert-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.convert-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow);
}

.convert-btn:hover::before {
    left: 100%;
}

.convert-btn:active {
    transform: translateY(0);
}

/* Result Section */
.result-section {
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.result-section.animate {
    animation: resultPop 0.5s ease;
}

@keyframes resultPop {
    0% { transform: scale(0.95); opacity: 0; }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); opacity: 1; }
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.result-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.result-header h3 i {
    color: var(--warning);
}

.copy-result-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 10px;
    background: var(--primary-light);
    color: var(--primary);
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--transition);
}

.copy-result-btn:hover {
    background: var(--primary);
    color: white;
    transform: scale(1.1);
}

/* Result Cards */
.result-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.result-card {
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.result-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.05;
    z-index: 0;
}

.solar-card {
    background: var(--solar-light);
    border: 2px solid rgba(245, 158, 11, 0.2);
}

.solar-card::before {
    background: radial-gradient(circle at top right, var(--solar-color), transparent 70%);
}

.lunar-card {
    background: var(--lunar-light);
    border: 2px solid rgba(139, 92, 246, 0.2);
}

.lunar-card::before {
    background: radial-gradient(circle at top right, var(--lunar-color), transparent 70%);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.solar-card .card-header {
    color: var(--solar-color);
}

.lunar-card .card-header {
    color: var(--lunar-color);
}

.card-header i {
    font-size: 1.25rem;
}

.card-header span {
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-body {
    position: relative;
    z-index: 1;
}

.big-date {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.weekday {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.lunar-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.leap-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    background: rgba(139, 92, 246, 0.15);
    color: var(--lunar-color);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Can Chi Section */
.canchi-section {
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.canchi-section h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.canchi-section h4 i {
    color: var(--secondary);
}

.canchi-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.canchi-item {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 1rem;
    text-align: center;
}

.canchi-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.canchi-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}

/* Additional Info */
.additional-info {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.info-row {
    display: flex;
    gap: 1rem;
}

.info-item {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1rem;
    background: var(--bg);
    border-radius: var(--radius);
}

.info-item.full-width {
    flex: none;
    width: 100%;
}

.info-item i {
    color: var(--primary);
    font-size: 1rem;
}

.info-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.info-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text);
    margin-left: auto;
}

/* Day Quality */
.day-quality {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.quality-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1rem;
}

.quality-header i {
    color: var(--secondary);
}

.quality-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.quality-good, .quality-bad {
    padding: 1rem;
    border-radius: var(--radius);
}

.quality-good {
    background: rgba(16, 185, 129, 0.1);
}

.quality-bad {
    background: rgba(239, 68, 68, 0.1);
}

.quality-good h5 {
    color: var(--success);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.quality-bad h5 {
    color: var(--danger);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.quality-good ul, .quality-bad ul {
    list-style: none;
    font-size: 0.875rem;
    color: var(--text);
}

.quality-good li, .quality-bad li {
    padding: 0.25rem 0;
}

/* Quick Picker */
.quick-picker-section {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.quick-picker-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quick-picker-section h3 i {
    color: var(--warning);
}

.quick-picker-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.quick-btn {
    padding: 0.625rem 1rem;
    border: 2px solid var(--border);
    border-radius: 50px;
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quick-btn:hover {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
    transform: translateY(-2px);
}

.quick-btn.today-quick {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.quick-btn.today-quick:hover {
    background: var(--primary-hover);
}

/* Features Section */
.features-section {
    margin-bottom: 2rem;
}

.features-section h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.features-section h2 i {
    color: var(--warning);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.feature-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    contain: layout style;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 1rem;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
}

.feature-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Info Section */
.info-section {
    margin-bottom: 2rem;
}

.info-accordion {
    background: var(--surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.info-accordion summary {
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: var(--text);
    list-style: none;
}

.info-accordion summary::-webkit-details-marker {
    display: none;
}

.info-accordion summary i:first-child {
    color: var(--primary);
}

.toggle-icon {
    margin-left: auto;
    transition: transform var(--transition);
    color: var(--text-secondary);
}

.info-accordion[open] .toggle-icon {
    transform: rotate(180deg);
}

.accordion-content {
    padding: 0 1.5rem 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.accordion-content ul {
    margin-top: 1rem;
    padding-left: 1.5rem;
}

.accordion-content li {
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 1.5rem;
    margin-top: 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.dmca-badge img {
    height: 24px;
    opacity: 0.7;
    transition: opacity var(--transition);
}

.dmca-badge:hover img {
    opacity: 1;
}

.footer-links {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.75rem;
}

.footer-links a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--primary-hover);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    text-align: center;
    color: white;
}

.spinner-ring {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(255,255,255,0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: spin 1s linear infinite;
}

.spinner-ring:nth-child(2) {
    width: 48px;
    height: 48px;
    position: absolute;
    top: 6px;
    left: 6px;
    border-top-color: var(--secondary);
    animation-direction: reverse;
    animation-duration: 0.8s;
}

.spinner-ring:nth-child(3) {
    width: 36px;
    height: 36px;
    position: absolute;
    top: 12px;
    left: 12px;
    border-top-color: var(--solar-color);
    animation-duration: 0.6s;
}

.loading-spinner p {
    font-size: 0.9rem;
}

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

/* Toast */
#toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.25rem;
    background: var(--surface);
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 500;
    animation: slideIn 0.3s ease;
}

.toast.fade-out {
    animation: slideOut 0.3s ease forwards;
}

.toast.success i { color: var(--success); }
.toast.error i { color: var(--danger); }
.toast.warning i { color: var(--warning); }
.toast.info i { color: var(--primary); }

@keyframes slideIn {
    from { opacity: 0; transform: translateX(100%); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(100%); }
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .page-title h1 {
        font-size: 1.5rem;
    }

    .mode-tabs {
        flex-direction: column;
    }

    .mode-tab span {
        display: none;
    }

    .mode-tab i {
        margin: 0;
    }

    .mode-tabs {
        flex-direction: row;
    }

    .converter-card {
        padding: 1.25rem;
    }

    .date-inputs-grid {
        grid-template-columns: 1fr;
    }

    .result-cards {
        grid-template-columns: 1fr;
    }

    .canchi-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .info-row {
        flex-direction: column;
    }

    .quality-content {
        grid-template-columns: 1fr;
    }

    .quick-picker-grid {
        flex-direction: column;
    }

    .quick-btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .panel-header {
        flex-direction: column;
        text-align: center;
    }

    .today-solar .day-number {
        font-size: 3rem;
    }

    .big-date {
        font-size: 1.5rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================================================
   HISTORICAL EVENTS SECTION
   ============================================================================ */

.historical-events-section {
    margin-top: 1.5rem;
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    animation: fadeIn 0.3s ease;
}

.history-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
    color: white;
    font-weight: 600;
}

.history-header i {
    font-size: 1.25rem;
}

.event-count {
    margin-left: auto;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
}

.history-events-list {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 400px;
    overflow-y: auto;
}

.history-event-card {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg);
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
    transition: all 0.2s ease;
}

.history-event-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.history-event-card.event-war {
    border-left-color: #ef4444;
}

.history-event-card.event-dynasty {
    border-left-color: #f59e0b;
}

.history-event-card.event-invention {
    border-left-color: #10b981;
}

.history-event-card.event-culture {
    border-left-color: #8b5cf6;
}

.history-event-card.event-disaster {
    border-left-color: #64748b;
}

.event-year-badge {
    min-width: 70px;
    height: 70px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius);
    font-weight: 700;
}

.event-year-badge .year {
    font-size: 1.1rem;
}

.event-year-badge .era {
    font-size: 0.7rem;
    opacity: 0.8;
}

.event-content {
    flex: 1;
}

.event-name {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.25rem;
    font-size: 1rem;
}

.event-anniversary {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.event-anniversary i {
    margin-right: 0.25rem;
    color: var(--primary);
}

.event-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.event-tag {
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
}

.event-tag.tag-politics {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
}

.event-tag.tag-science {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
}

.event-tag.tag-culture {
    background: rgba(139, 92, 246, 0.1);
    color: #8b5cf6;
}

.event-tag.tag-war {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.event-tag.tag-global {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
}

.event-tag.tag-national {
    background: rgba(236, 72, 153, 0.1);
    color: #ec4899;
}

.no-events-message {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.no-events-message i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

/* Dark mode adjustments */
.dark-mode .history-event-card {
    background: rgba(30, 41, 59, 0.5);
}

.dark-mode .event-year-badge {
    background: rgba(59, 130, 246, 0.2);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .history-event-card {
        flex-direction: column;
        gap: 0.75rem;
    }

    .event-year-badge {
        flex-direction: row;
        width: 100%;
        height: auto;
        padding: 0.5rem 1rem;
        gap: 0.5rem;
    }
}

/* ============================================
   TIMEZONE TOGGLE
   ============================================ */

.timezone-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding: 0.75rem;
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.tz-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.tz-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.tz-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.tz-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.tz-btn i {
    font-size: 1rem;
}

/* ============================================
   VN/CN COMPARISON SECTION
   ============================================ */

.comparison-section {
    margin-top: 1.5rem;
    padding: 1.25rem;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(139, 92, 246, 0.05));
    border: 2px solid var(--primary);
    border-radius: var(--radius-lg);
}

.comparison-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--primary);
}

.comparison-header i {
    font-size: 1.25rem;
}

.comparison-badge {
    margin-left: auto;
    padding: 0.25rem 0.75rem;
    background: var(--warning);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 20px;
    text-transform: uppercase;
}

.comparison-content {
    display: flex;
    align-items: stretch;
    gap: 1rem;
}

.comparison-card {
    flex: 1;
    padding: 1rem;
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
}

.comparison-card.vn {
    border-left: 4px solid #ef4444;
}

.comparison-card.cn {
    border-left: 4px solid #f59e0b;
}

.comparison-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.comparison-date {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.comparison-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.comparison-zodiac {
    font-size: 0.875rem;
    color: var(--text);
}

.comparison-zodiac strong {
    color: var(--primary);
}

.comparison-vs {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 1.5rem;
}

.comparison-note {
    margin-top: 1rem;
    padding: 0.75rem;
    background: rgba(245, 158, 11, 0.1);
    border-radius: var(--radius);
    font-size: 0.875rem;
    color: var(--warning);
    text-align: center;
}

/* Dark mode */
.dark-mode .comparison-section {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
}

.dark-mode .comparison-card {
    background: var(--surface);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .comparison-content {
        flex-direction: column;
    }
    
    .comparison-vs {
        transform: rotate(90deg);
        padding: 0.5rem 0;
    }
    
    .timezone-toggle {
        flex-wrap: wrap;
    }
    
    .region-btns {
        flex-direction: column;
    }
    
    .historical-tz-notice {
        padding: 0.75rem;
    }
}

/* ============================================
   HISTORICAL TIMEZONE NOTICE & SELECTORS
   ============================================ */

.historical-tz-notice {
    margin-bottom: 1.5rem;
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.08), rgba(251, 191, 36, 0.08));
    border: 2px solid var(--warning);
    border-radius: var(--radius-lg);
}

.notice-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--warning);
    font-size: 1rem;
}

.notice-header i {
    font-size: 1.25rem;
}

.notice-content p {
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.region-selector {
    margin-top: 1rem;
}

.region-selector label,
.city-selector label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.region-btns {
    display: flex;
    gap: 0.75rem;
}

.region-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.region-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.region-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.region-btn i {
    font-size: 1rem;
}

.city-selector {
    margin-top: 1rem;
}

#city-selector {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

#city-selector:hover,
#city-selector:focus {
    border-color: var(--primary);
    outline: none;
}

#city-selector option {
    padding: 0.5rem;
}

#city-selector optgroup {
    font-weight: 600;
    color: var(--text);
}

/* ============================================
   HISTORICAL TIMEZONE RESULT DISPLAY
   ============================================ */

.historical-tz-result {
    margin-top: 1.5rem;
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.08), rgba(52, 211, 153, 0.08));
    border: 2px solid var(--success);
    border-radius: var(--radius-lg);
}

.tz-result-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--success);
    font-size: 0.95rem;
}

.tz-result-header i {
    font-size: 1.1rem;
}

.tz-result-content {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.tz-result-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tz-result-item.full-width {
    width: 100%;
}

.tz-result-item .tz-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.tz-result-item .tz-value {
    font-weight: 600;
    color: var(--text);
    background: rgba(16, 185, 129, 0.15);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
}

.tz-warning {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: rgba(245, 158, 11, 0.15);
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--warning);
}

.tz-warning i {
    font-size: 1rem;
}

/* Dark mode adjustments */
.dark-mode .historical-tz-notice {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(251, 191, 36, 0.12));
}

.dark-mode .historical-tz-result {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(52, 211, 153, 0.12));
}

.dark-mode #city-selector {
    background: var(--surface);
}
/* ============================================
   ADVANCED OPTIONS PANEL
   ============================================ */

.advanced-options-toggle {
    margin: 1.5rem 0;
}

.toggle-btn {
    width: 100%;
    padding: 0.875rem 1.25rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.toggle-btn:hover {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
}

.toggle-btn .icon-right {
    margin-left: auto;
    font-size: 0.75rem;
    transition: transform var(--transition);
}

.toggle-btn.active .icon-right {
    transform: rotate(180deg);
}

.advanced-options-panel {
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    animation: slideDown var(--transition);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.advanced-group {
    margin-bottom: 1.25rem;
}

.advanced-group:last-child {
    margin-bottom: 0;
}

.advanced-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 0.75rem;
}

.advanced-group label i {
    color: var(--primary);
}

.longitude-input-group {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 0.75rem;
}

.longitude-input-group input,
.longitude-input-group select {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--text);
    background: var(--surface);
    transition: all var(--transition);
}

.longitude-input-group input:focus,
.longitude-input-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.city-preset {
    cursor: pointer;
}

.hint-text {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-style: italic;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    flex: 1;
}

.checkbox-container:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.checkbox-container input[type="checkbox"] {
    display: none;
}

.checkbox-container .checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
}

.checkbox-container .checkmark::after {
    content: '✓';
    font-size: 13px;
    color: white;
    opacity: 0;
    transform: scale(0);
    transition: all var(--transition);
}

.checkbox-container input[type="checkbox"]:checked + .checkmark {
    background: var(--primary);
    border-color: var(--primary);
}

.checkbox-container input[type="checkbox"]:checked + .checkmark::after {
    opacity: 1;
    transform: scale(1);
}

.checkbox-container .label-text {
    font-size: 0.9rem;
    color: var(--text);
}

.tooltip-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    cursor: help;
    transition: all var(--transition);
}

.tooltip-icon:hover {
    background: var(--primary);
    color: white;
    transform: scale(1.1);
}

/* ============================================
   TIME CONFIRMATION CARD
   ============================================ */

.time-confirmation-card {
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
    border: 2px solid var(--primary);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.time-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.time-card-header i {
    font-size: 1.2rem;
}

.time-display {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.current-time-display {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1.25rem;
    background: var(--surface);
    border-radius: var(--radius);
}

.time-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.time-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    font-family: 'Courier New', monospace;
    letter-spacing: 1px;
}

.time-tz-info {
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: rgba(59, 130, 246, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 500;
}

.time-adjust-hint {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(59, 130, 246, 0.08);
    border-radius: var(--radius);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.time-adjust-hint i {
    color: var(--primary);
}

/* ============================================
   TIME INPUTS GRID
   ============================================ */

.time-inputs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1.5fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.time-sync-group {
    display: flex;
    align-items: flex-end;
}

.sync-time-btn {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--primary);
    border-radius: var(--radius);
    background: var(--primary-light);
    color: var(--primary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.sync-time-btn:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.sync-time-btn i {
    font-size: 1rem;
}

/* ============================================
   HOUR LOOKUP PANEL ICON
   ============================================ */

.panel-icon.hour-lookup {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(251, 191, 36, 0.15));
    color: var(--warning);
}

/* ============================================
   TRUE SOLAR TIME OPTIONS
   ============================================ */

.solar-time-options {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05), rgba(251, 191, 36, 0.05));
    border: 2px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.option-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1rem;
    color: var(--warning);
    margin-bottom: 0.75rem;
}

.option-header i {
    font-size: 1.2rem;
}

.option-description {
    margin-bottom: 1.25rem;
}

.option-description p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.toggle-switch-group {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 56px;
    height: 30px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border);
    transition: var(--transition);
    border-radius: 30px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: var(--transition);
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .toggle-slider {
    background: linear-gradient(135deg, var(--warning), #f59e0b);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(26px);
}

.toggle-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
}

.longitude-section {
    animation: slideDown var(--transition);
    margin-top: 1rem;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   HOUR MODE TOGGLE (Civil vs Feng Shui)
   ============================================ */

.hour-mode-section {
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-top: 1.5rem;
    animation: fadeIn 0.3s ease;
}

.hour-mode-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text);
}

.hour-mode-header i {
    color: var(--primary);
}

.hour-mode-badge {
    margin-left: auto;
    padding: 0.25rem 0.75rem;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.hour-mode-badge.fengshui {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.hour-mode-toggle {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.hour-mode-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

.hour-mode-btn:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.hour-mode-btn.active {
    border-color: var(--primary);
    background: var(--primary-light);
    box-shadow: 0 4px 12px var(--primary-glow);
}

.hour-mode-btn[data-mode="fengshui"].active {
    border-color: var(--warning);
    background: rgba(245, 158, 11, 0.1);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.25);
}

.hour-mode-btn i {
    font-size: 1.25rem;
    color: var(--primary);
}

.hour-mode-btn[data-mode="fengshui"] i {
    color: var(--warning);
}

.hour-mode-btn .btn-title {
    font-weight: 600;
    color: var(--text);
    font-size: 0.95rem;
}

.hour-mode-btn .btn-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Feng Shui Hour Details */
.fengshui-hour-section {
    background: rgba(245, 158, 11, 0.05);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-top: 1rem;
    animation: slideDown var(--transition);
}

.fengshui-location-selector {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px dashed rgba(245, 158, 11, 0.3);
}

.fengshui-location-selector label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.fengshui-location-selector label i {
    color: var(--warning);
}

.fengshui-location-selector .city-selector {
    flex: 1;
    min-width: 180px;
    padding: 0.5rem 1rem;
    border: 2px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition);
}

.fengshui-location-selector .city-selector:focus {
    outline: none;
    border-color: var(--warning);
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.15);
}

.fengshui-location-selector .custom-longitude-input {
    width: 120px;
    padding: 0.5rem 0.75rem;
    border: 2px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    font-size: 0.9rem;
}

.fengshui-location-selector .custom-longitude-input:focus {
    outline: none;
    border-color: var(--warning);
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.15);
}

.fengshui-hour-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
}

.fengshui-hour-item {
    text-align: center;
    padding: 1rem;
    border-radius: var(--radius);
    background: var(--surface);
}

.fengshui-hour-item.civil {
    border-left: 3px solid var(--primary);
}

.fengshui-hour-item.solar {
    border-left: 3px solid var(--warning);
}

.fengshui-hour-item .item-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.fengshui-hour-item .item-label i {
    margin-right: 0.25rem;
}

.fengshui-hour-item.civil .item-label i {
    color: var(--primary);
}

.fengshui-hour-item.solar .item-label i {
    color: var(--warning);
}

.fengshui-hour-item .item-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.fengshui-hour-item .item-canchi {
    font-size: 1rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    display: inline-block;
}

.fengshui-hour-item.civil .item-canchi {
    background: var(--primary-light);
    color: var(--primary);
}

.fengshui-hour-item.solar .item-canchi {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.fengshui-hour-arrow {
    color: var(--text-secondary);
    font-size: 1.25rem;
}

.fengshui-hour-arrow i {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translateX(0); opacity: 1; }
    50% { transform: translateX(5px); opacity: 0.5; }
}

.fengshui-corrections {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--surface);
    border-radius: var(--radius);
    margin-bottom: 0.75rem;
}

.correction-item {
    display: flex;
    gap: 0.5rem;
    font-size: 0.8rem;
}

.correction-item .corr-label {
    color: var(--text-secondary);
}

.correction-item .corr-value {
    font-weight: 600;
    color: var(--text);
}

.correction-item.total {
    width: 100%;
    padding-top: 0.5rem;
    border-top: 1px dashed var(--border);
}

.correction-item.total .corr-value {
    color: var(--warning);
}

.fengshui-note {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    padding: 0.75rem;
    background: rgba(245, 158, 11, 0.05);
    border-radius: var(--radius);
}

.fengshui-note i {
    color: var(--warning);
    margin-top: 2px;
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */

@media (max-width: 768px) {
    .time-inputs-grid {
        grid-template-columns: 1fr;
    }
    
    .longitude-input-group {
        grid-template-columns: 1fr;
    }
    
    .fengshui-hour-grid {
        grid-template-columns: 1fr;
    }
    
    .fengshui-hour-arrow {
        transform: rotate(90deg);
    }
    
    .hour-mode-toggle {
        grid-template-columns: 1fr;
    }
    
    .checkbox-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .tooltip-icon {
        align-self: flex-end;
    }
}