/* ============================================
   ATMOSPHERE WEATHER APP - DESIGN SYSTEM
   ============================================ */

/* CSS Variables - Alpine Frost Palette */
:root {
    /* Colors */
    --color-bg-primary: #0A1929;
    --color-bg-secondary: #0D1F30;
    --color-bg-card: rgba(46, 80, 144, 0.15);
    --color-bg-card-hover: rgba(46, 80, 144, 0.25);
    --color-accent: #A8C4E0;
    --color-accent-bright: #E3EDF7;
    --color-text-primary: #E3EDF7;
    --color-text-secondary: #A8C4E0;
    --color-text-muted: #6B8BA3;
    --color-border: rgba(168, 196, 224, 0.15);
    --color-error: #FF6B6B;
    --color-success: #4ECDC4;
    
    /* Typography */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Outfit', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(168, 196, 224, 0.15);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Effects */
.app-container {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(46, 80, 144, 0.4) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(168, 196, 224, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(10, 25, 41, 0.8) 0%, var(--color-bg-primary) 100%);
    z-index: -2;
    pointer-events: none;
}

.bg-noise {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    z-index: -1;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 25, 41, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-accent);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.location-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.location-btn:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-accent);
    color: var(--color-text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.location-btn svg {
    width: 16px;
    height: 16px;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Search Section */
.search-section {
    margin-bottom: var(--spacing-xl);
}

.search-container {
    position: relative;
    max-width: 500px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    padding-right: 60px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 400;
    outline: none;
    transition: all var(--transition-normal);
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

.search-input:focus {
    background: var(--color-bg-card-hover);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-glow);
}

.search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    background: var(--color-accent);
    border: none;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.search-btn:hover {
    background: var(--color-accent-bright);
    transform: translateY(-50%) scale(1.05);
    box-shadow: var(--shadow-md);
}

.search-btn svg {
    width: 20px;
    height: 20px;
    color: var(--color-bg-primary);
}

/* Loading State */
.loading-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl);
    text-align: center;
}

.loading-state.active {
    display: flex;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

.loading-state p {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
}

/* Error State */
.error-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl);
    text-align: center;
}

.error-state.active {
    display: flex;
}

.error-state svg {
    width: 64px;
    height: 64px;
    color: var(--color-error);
    margin-bottom: var(--spacing-md);
}

.error-state p {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.retry-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.retry-btn:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-accent);
}

/* Weather Display */
.weather-display {
    display: none;
    animation: fadeIn 0.6s ease;
}

.weather-display.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Current Weather */
.current-weather {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.location-info {
    margin-bottom: var(--spacing-lg);
}

.city-name {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.date-time {
    color: var(--color-text-secondary);
    font-size: 1rem;
    font-weight: 300;
}

.weather-main {
    margin-bottom: var(--spacing-xl);
}

.weather-icon-container {
    width: 140px;
    height: 140px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.weather-icon-container svg {
    width: 100%;
    height: 100%;
    color: var(--color-accent);
    filter: drop-shadow(0 0 30px rgba(168, 196, 224, 0.4));
}

.temperature-display {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 4px;
    margin-bottom: var(--spacing-sm);
}

.temperature {
    font-family: var(--font-display);
    font-size: 6rem;
    font-weight: 300;
    color: var(--color-text-primary);
    line-height: 1;
    letter-spacing: -0.04em;
}

.unit {
    font-family: var(--font-body);
    font-size: 2rem;
    font-weight: 300;
    color: var(--color-text-secondary);
    margin-top: 8px;
}

.weather-description {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    text-transform: capitalize;
    font-weight: 400;
}

/* Weather Details Grid */
.weather-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

.detail-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.detail-card:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.detail-card svg {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
    flex-shrink: 0;
}

.detail-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.detail-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.detail-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

/* Forecast Section */
.forecast-section {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xs);
}

.forecast-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-md);
}

.forecast-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.forecast-item:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.forecast-day {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.forecast-icon {
    width: 48px;
    height: 48px;
    margin: var(--spacing-xs) 0;
    color: var(--color-accent);
}

.forecast-temps {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.forecast-high {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.forecast-low {
    font-size: 1rem;
    color: var(--color-text-muted);
}

/* Hourly Section */
.hourly-section {
    margin-bottom: var(--spacing-xl);
}

.hourly-container {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding: var(--spacing-xs) 0;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

.hourly-container::-webkit-scrollbar {
    height: 6px;
}

.hourly-container::-webkit-scrollbar-track {
    background: transparent;
}

.hourly-container::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

.hourly-item {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    min-width: 80px;
    transition: all var(--transition-normal);
}

.hourly-item:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-accent);
}

.hourly-time {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.hourly-icon {
    width: 32px;
    height: 32px;
    margin: var(--spacing-xs) 0;
    color: var(--color-accent);
}

.hourly-temp {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    margin-top: auto;
}

.footer p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: var(--spacing-sm);
    }
    
    .logo-text {
        font-size: 1.25rem;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .city-name {
        font-size: 2rem;
    }
    
    .temperature {
        font-size: 4rem;
    }
    
    .unit {
        font-size: 1.5rem;
    }
    
    .weather-icon-container {
        width: 100px;
        height: 100px;
    }
    
    .weather-details {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .detail-card {
        padding: var(--spacing-sm);
    }
    
    .forecast-container {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
}

@media (max-width: 480px) {
    .location-btn span {
        display: none;
    }
    
    .city-name {
        font-size: 1.75rem;
    }
    
    .temperature {
        font-size: 3.5rem;
    }
    
    .weather-details {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
}

/* Weather Condition Animations */
.weather-sunny {
    animation: float 3s ease-in-out infinite;
}

.weather-cloudy {
    animation: drift 4s ease-in-out infinite;
}

.weather-rainy {
    animation: shake 0.5s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes drift {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(10px); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-2px); }
    75% { transform: translateX(2px); }
}