/* ==========================================
   K-WEATHER SYSTEM DESIGN SYSTEM
   Modern Dark Glassmorphism Theme
   ========================================== */

:root {
    /* Color Palette */
    --bg-main: #0B0F19;
    --bg-surface: rgba(17, 24, 39, 0.75);
    --bg-surface-hover: rgba(30, 41, 59, 0.85);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-border: rgba(255, 255, 255, 0.08);
    --bg-glass-border-hover: rgba(56, 189, 248, 0.4);

    /* Text Colors */
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    /* Accent & Brand Colors */
    --accent-blue: #38BDF8;
    --accent-cyan: #06B6D4;
    --accent-indigo: #6366F1;
    --accent-purple: #8B5CF6;
    --accent-warm: #F59E0B;
    --accent-red: #EF4444;
    --accent-green: #10B981;

    /* Weather Condition Highlights */
    --clear-glow: rgba(251, 191, 36, 0.15);
    --rain-glow: rgba(56, 189, 248, 0.15);
    --cloud-glow: rgba(148, 163, 184, 0.12);

    /* Fonts */
    --font-heading: 'Outfit', -apple-system, sans-serif;
    --font-body: 'Noto Sans KR', -apple-system, sans-serif;

    /* Transitions & Shadows */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-glass: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.15);
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
    position: relative;
}

/* Ambient Gradient Backgrounds */
.bg-gradient-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at 50% 0%, rgba(30, 58, 138, 0.25), transparent 70%),
                radial-gradient(circle at 100% 50%, rgba(88, 28, 135, 0.15), transparent 60%);
    pointer-events: none;
    z-index: -2;
}

.ambient-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    pointer-events: none;
    z-index: -1;
    opacity: 0.4;
    animation: floatGlow 12s ease-in-out infinite alternate;
}

.glow-1 {
    top: -10%;
    left: 20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #38bdf8, transparent 70%);
}

.glow-2 {
    bottom: 10%;
    right: 15%;
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, #8b5cf6, transparent 70%);
}

@keyframes floatGlow {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(30px, -40px) scale(1.1); }
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--bg-glass-border);
    padding: 1rem 0;
}

.header-container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.brand-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.back-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-surface);
    border: 1px solid var(--bg-glass-border);
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--text-primary);
    background: var(--bg-surface-hover);
    border-color: var(--accent-blue);
    transform: translateX(-2px);
}

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

.logo-icon {
    font-size: 1.75rem;
    color: var(--accent-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(99, 102, 241, 0.2));
    width: 46px;
    height: 46px;
    border-radius: 12px;
    border: 1px solid rgba(56, 189, 248, 0.3);
}

.logo-text h1 {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #FFFFFF 30%, var(--accent-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.1;
}

.logo-subtitle {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.5px;
}

.live-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 20px;
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--accent-green);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background-color: var(--accent-green);
    box-shadow: 0 0 8px var(--accent-green);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.85); }
}

/* Controls */
.controls-group {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
    width: 18px;
    height: 18px;
    pointer-events: none;
}

.search-box input {
    background: var(--bg-surface);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-md);
    padding: 0.6rem 2.2rem 0.6rem 2.5rem;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.88rem;
    width: 240px;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-blue);
    width: 280px;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.2);
}

.clear-btn {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
}

.clear-btn.hidden {
    display: none;
}

.unit-toggle {
    display: flex;
    background: var(--bg-surface);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-md);
    padding: 3px;
}

.unit-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.4rem 0.85rem;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.85rem;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
}

.unit-btn.active {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
    color: #FFFFFF;
    box-shadow: 0 2px 10px rgba(56, 189, 248, 0.3);
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-surface);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-md);
    padding: 0.6rem 1.1rem;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.action-btn:hover {
    background: var(--bg-surface-hover);
    border-color: var(--accent-blue);
    transform: translateY(-1px);
}

.action-btn.spinning i {
    animation: spin 1s linear infinite;
}

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

/* Main Content */
.main-content {
    max-width: 1320px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

/* Dashboard Hero */
.dashboard-hero {
    background: var(--bg-surface);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 2rem;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-glass);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    overflow: hidden;
}

.dashboard-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple), var(--accent-cyan));
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 0.4rem;
    color: #FFFFFF;
}

.hero-desc {
    color: var(--text-secondary);
    font-size: 0.92rem;
    max-width: 750px;
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.summary-card {
    background: var(--bg-glass);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-lg);
    padding: 1.1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.summary-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.15);
}

.summary-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(56, 189, 248, 0.15);
    border: 1px solid rgba(56, 189, 248, 0.3);
    color: var(--accent-blue);
    display: flex;
    align-items: center;
    justify-content: center;
}

.summary-icon.warm {
    background: rgba(245, 158, 11, 0.15);
    border-color: rgba(245, 158, 11, 0.3);
    color: var(--accent-warm);
}

.summary-icon.cool {
    background: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.3);
    color: var(--accent-indigo);
}

.summary-icon.time {
    background: rgba(139, 92, 246, 0.15);
    border-color: rgba(139, 92, 246, 0.3);
    color: var(--accent-purple);
}

.summary-info {
    display: flex;
    flex-direction: column;
}

.summary-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.summary-val {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Region Tabs Filter */
.filter-section {
    margin-bottom: 2rem;
}

.region-tabs {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    scrollbar-width: thin;
}

.tab-btn {
    background: var(--bg-surface);
    border: 1px solid var(--bg-glass-border);
    color: var(--text-secondary);
    padding: 0.55rem 1.1rem;
    border-radius: 30px;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: #FFFFFF;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

/* Weather Grid */
.weather-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

@media (max-width: 1200px) {
    .weather-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 860px) {
    .weather-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 540px) {
    .weather-grid {
        grid-template-columns: 1fr;
    }
}

/* City Weather Card */
.city-card {
    background: var(--bg-surface);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 250px;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(12px);
}

.city-card:hover {
    transform: translateY(-5px);
    border-color: var(--bg-glass-border-hover);
    box-shadow: var(--shadow-glass), var(--shadow-glow);
    background: var(--bg-surface-hover);
}

.city-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
}

.city-name-group {
    display: flex;
    flex-direction: column;
}

.city-kr {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 800;
    color: #FFFFFF;
    line-height: 1.2;
}

.city-en {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.weather-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-blue);
}

/* Weather Icon & Main Temp */
.city-card-body {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 1.2rem 0;
}

.temp-large {
    font-family: var(--font-heading);
    font-size: 2.75rem;
    font-weight: 800;
    color: #FFFFFF;
    line-height: 1;
}

.weather-icon-img {
    width: 64px;
    height: 64px;
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.3));
}

.condition-text {
    font-size: 0.88rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-top: 0.2rem;
}

/* Card Details Footer */
.city-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--bg-glass-border);
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.metric-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.metric-item i {
    width: 14px;
    height: 14px;
    color: var(--accent-blue);
}

.temp-range {
    font-weight: 600;
    color: var(--text-primary);
}

/* Skeleton Loading Cards */
.skeleton-card {
    background: var(--bg-surface);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-xl);
    height: 250px;
    position: relative;
    overflow: hidden;
}

.skeleton-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(5, 8, 15, 0.8);
    backdrop-filter: blur(16px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

.modal-card {
    background: #0F172A;
    border: 1px solid var(--bg-glass-border-hover);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 820px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    padding: 2.2rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
    transform: scale(0.95);
    transition: var(--transition);
}

.modal-overlay.active .modal-card {
    transform: scale(1);
}

.modal-close-btn {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--bg-glass-border);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.modal-close-btn:hover {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--accent-red);
    color: #FFFFFF;
}

/* Modal Content Layout */
.modal-header-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.modal-city-title h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    color: #FFFFFF;
}

.modal-city-subtitle {
    color: var(--text-muted);
    font-size: 0.88rem;
}

.modal-main-weather {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background: var(--bg-glass);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-lg);
    padding: 1.2rem 1.8rem;
}

.modal-temp-huge {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 800;
    color: #FFFFFF;
    line-height: 1;
}

.modal-weather-desc {
    display: flex;
    flex-direction: column;
}

.modal-desc-main {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-blue);
}

.modal-desc-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Modal Grid Details */
.modal-grid-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.modal-metric-card {
    background: var(--bg-glass);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.modal-metric-title {
    font-size: 0.78rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.modal-metric-value {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Chart Container */
.chart-section {
    background: var(--bg-glass);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.chart-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #FFFFFF;
}

.chart-container-wrapper {
    position: relative;
    height: 240px;
    width: 100%;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--bg-glass-border);
    background: rgba(11, 15, 25, 0.95);
    padding: 2.5rem 0;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.1rem;
    color: #FFFFFF;
    display: flex;
    align-items: center;
    gap: 0.5rem;

}

.footer-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.88rem;
    transition: var(--transition);
}

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