/* ==========================================================================
   K-WEATHER PORTAL - Modern Glassmorphism CSS Design System
   ========================================================================== */

:root {
    --bg-dark: #0b0f19;
    --bg-card: rgba(22, 28, 45, 0.65);
    --bg-card-hover: rgba(30, 40, 65, 0.85);
    --border-color: rgba(255, 255, 255, 0.12);
    --border-highlight: rgba(255, 255, 255, 0.25);
    
    --primary-color: #38bdf8;
    --primary-glow: rgba(56, 189, 248, 0.35);
    --accent-sun: #fbbf24;
    --accent-rain: #60a5fa;
    --accent-cloud: #94a3b8;
    --accent-hot: #f87171;
    --accent-cold: #38bdf8;
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    
    --font-heading: 'Outfit', 'Noto Sans KR', sans-serif;
    --font-body: 'Noto Sans KR', 'Outfit', sans-serif;
    
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* Dynamic Background */
.app-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    background: radial-gradient(circle at 20% 20%, #1e1b4b 0%, #0f172a 50%, #020617 100%);
    transition: background 1s ease-in-out;
}

.bg-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background-image: radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
}

/* Layout Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
}

/* Glassmorphism Utilities */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-glass);
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 28px;
    margin-bottom: 24px;
    background: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glass);
    flex-wrap: wrap;
    gap: 16px;
}

.header-branding {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: #fff;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.logo-text h1 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1.2;
    background: linear-gradient(90deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text h1 span {
    background: linear-gradient(90deg, #38bdf8 0%, #818cf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    padding: 4px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-full);
    color: var(--text-muted);
    font-weight: 700;
    font-size: 0.85rem;
    text-decoration: none;
    transition: var(--transition-fast);
}

.nav-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.nav-btn.active {
    background: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    color: #0f172a;
    box-shadow: 0 2px 10px var(--primary-glow);
}

.time-widget {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.06);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-main);
    font-weight: 500;
}

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

.unit-toggle {
    display: flex;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-full);
    padding: 3px;
    border: 1px solid var(--border-color);
}

.unit-btn {
    border: none;
    background: transparent;
    color: var(--text-muted);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.unit-btn.active {
    background: var(--primary-color);
    color: #0f172a;
    box-shadow: 0 2px 10px var(--primary-glow);
}

.refresh-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.2) 0%, rgba(99, 102, 241, 0.2) 100%);
    border: 1px solid rgba(56, 189, 248, 0.4);
    color: #fff;
    padding: 10px 20px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.refresh-btn:hover {
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.35) 0%, rgba(99, 102, 241, 0.35) 100%);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

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

@keyframes spin {
    100% { transform: rotate(360deg); }
}

/* Summary Banner */
.summary-banner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.summary-card {
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: var(--transition-fast);
}

.summary-card:hover {
    border-color: var(--border-highlight);
    transform: translateY(-2px);
}

.summary-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

.summary-icon.hot { background: rgba(248, 113, 113, 0.2); color: #f87171; }
.summary-icon.cold { background: rgba(56, 189, 248, 0.2); color: #38bdf8; }
.summary-icon.avg { background: rgba(168, 85, 247, 0.2); color: #c084fc; }
.summary-icon.status { background: rgba(52, 211, 153, 0.2); color: #34d399; }

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

.summary-info .label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.summary-info .value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Controls Section */
.controls-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    background: rgba(15, 23, 42, 0.6);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.search-box {
    position: relative;
    flex: 1;
    min-width: 260px;
}

.search-box .search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1.1rem;
}

.search-box input {
    width: 100%;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 10px 40px 10px 42px;
    color: #fff;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-fast);
}

.search-box input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 15px var(--primary-glow);
    background: rgba(255, 255, 255, 0.1);
}

.search-box .clear-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
}

.region-filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-pill {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-pill:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.12);
}

.filter-pill.active {
    background: var(--primary-color);
    color: #0f172a;
    font-weight: 700;
    border-color: var(--primary-color);
    box-shadow: 0 2px 12px var(--primary-glow);
}

.sort-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    color: var(--text-muted);
}

.sort-selector select {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 0.85rem;
    font-weight: 600;
    outline: none;
    cursor: pointer;
}

.sort-selector select option {
    background: #0f172a;
    color: #fff;
}

/* Loading & Error States */
.loading-container, .error-container {
    text-align: center;
    padding: 60px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

.error-container i {
    font-size: 48px;
    color: #f87171;
    margin-bottom: 12px;
}

.retry-btn {
    margin-top: 16px;
    background: #f87171;
    color: #fff;
    border: none;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
}

/* City Cards Grid */
.city-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.city-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.city-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), #818cf8);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.city-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-highlight);
    background: var(--bg-card-hover);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5);
}

.city-card:hover::before {
    opacity: 1;
}

.card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

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

.city-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 8px;
}

.region-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    color: var(--primary-color);
    width: fit-content;
    margin-top: 2px;
}

.fav-btn {
    background: transparent;
    border: none;
    color: var(--text-dim);
    font-size: 1.4rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.fav-btn.active, .fav-btn:hover {
    color: var(--accent-sun);
    transform: scale(1.15);
}

.weather-main-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 12px 0;
}

.weather-temp-block {
    display: flex;
    flex-direction: column;
}

.current-temp {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1;
    color: #fff;
}

.feels-like {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.weather-icon-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.weather-icon-img {
    width: 68px;
    height: 68px;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.4));
}

.weather-desc {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    text-align: center;
}

.card-details-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    padding-top: 14px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 12px;
    background: rgba(0, 0, 0, 0.15);
    padding: 10px;
    border-radius: var(--radius-sm);
}

.detail-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.detail-item i {
    font-size: 1rem;
    color: var(--primary-color);
    margin-bottom: 2px;
}

.detail-item .lbl {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.detail-item .val {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-main);
}

.card-footer-action {
    margin-top: 14px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--primary-color);
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    opacity: 0.8;
    transition: var(--transition-fast);
}

.city-card:hover .card-footer-action {
    opacity: 1;
    transform: translateX(4px);
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 24px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
}

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

.app-footer code {
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    color: #cbd5e1;
}

/* Modal */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(2, 6, 23, 0.8);
    backdrop-filter: blur(12px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.modal-content {
    width: 100%;
    max-width: 760px;
    max-height: 90vh;
    overflow-y: auto;
    background: #0f172a;
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-lg);
    padding: 28px;
    position: relative;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.7);
}

.modal-close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: #fff;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.modal-close-btn:hover {
    background: #f87171;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.modal-city-info h2 {
    font-size: 2rem;
    font-weight: 800;
}

.modal-city-info p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.modal-temp-display {
    display: flex;
    align-items: center;
    gap: 16px;
}

.modal-temp-display .big-temp {
    font-size: 3.2rem;
    font-weight: 800;
    font-family: var(--font-heading);
}

.modal-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.modal-stat-box {
    background: rgba(255, 255, 255, 0.05);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.modal-stat-box .title {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.modal-stat-box .val {
    font-size: 1.1rem;
    font-weight: 700;
    margin-top: 4px;
    color: #fff;
}

.forecast-section h3 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
}

.forecast-timeline {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 12px;
}

.forecast-pill {
    min-width: 100px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 8px;
    text-align: center;
    flex-shrink: 0;
}

.forecast-pill .time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.forecast-pill img {
    width: 40px;
    height: 40px;
    margin: 4px 0;
}

.forecast-pill .temp {
    font-weight: 700;
    font-size: 1rem;
}

.forecast-pill .desc {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .header-actions {
        justify-content: space-between;
    }

    .controls-section {
        flex-direction: column;
        align-items: stretch;
    }
    
    .city-grid {
        grid-template-columns: 1fr;
    }
}