/* ==================== CSS Variables ==================== */
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warm-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --text-tertiary: rgba(255, 255, 255, 0.6);
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --border-radius-xl: 24px;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 50%, #7e22ce 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(138, 43, 226, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(59, 130, 246, 0.3) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* ==================== Glass Card Effect ==================== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px 0 rgba(31, 38, 135, 0.45);
}

/* ==================== Header ==================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    animation: fadeInDown 0.6s ease;
}

.logo svg {
    filter: drop-shadow(0 4px 8px rgba(255, 215, 0, 0.3));
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff 0%, #f0f0f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.search-container {
    display: flex;
    gap: var(--spacing-xs);
    animation: fadeInDown 0.6s ease 0.2s backwards;
}

#searchInput {
    padding: 0.875rem 1.25rem;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    font-size: 0.95rem;
    width: 300px;
    transition: all var(--transition-normal);
    outline: none;
}

#searchInput::placeholder {
    color: var(--text-tertiary);
}

#searchInput:focus {
    border-color: rgba(255, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.search-btn,
.location-btn {
    padding: 0.875rem 1.25rem;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-btn:hover,
.location-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.search-btn:active,
.location-btn:active {
    transform: translateY(0);
}

/* ==================== Current Weather ==================== */
.current-weather {
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.6s ease 0.3s backwards;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--text-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

.current-weather-content {
    width: 100%;
}

.current-main {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.location-info h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

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

.current-temp {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.temp-display {
    font-size: 5rem;
    font-weight: 300;
    line-height: 1;
    display: flex;
    align-items: flex-start;
}

.temp-unit {
    font-size: 2.5rem;
    margin-left: 0.25rem;
    opacity: 0.8;
}

.weather-icon-large img {
    width: 120px;
    height: 120px;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
    animation: float 3s ease-in-out infinite;
}

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

.weather-description {
    text-align: right;
}

.weather-description p:first-child {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    text-transform: capitalize;
}

.feels-like {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.current-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
}

.detail-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.05);
    transition: all var(--transition-normal);
}

.detail-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(4px);
}

.detail-item svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.detail-item > div {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.detail-label {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-value {
    font-size: 1.1rem;
    font-weight: 600;
}

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

.section-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.6s ease 0.4s backwards;
}

.forecast-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-md);
}

.forecast-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--glass-border);
    padding: var(--spacing-md);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    animation: fadeInUp 0.6s ease backwards;
}

.forecast-card:nth-child(1) { animation-delay: 0.5s; }
.forecast-card:nth-child(2) { animation-delay: 0.55s; }
.forecast-card:nth-child(3) { animation-delay: 0.6s; }
.forecast-card:nth-child(4) { animation-delay: 0.65s; }
.forecast-card:nth-child(5) { animation-delay: 0.7s; }
.forecast-card:nth-child(6) { animation-delay: 0.75s; }
.forecast-card:nth-child(7) { animation-delay: 0.8s; }

.forecast-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 0.15);
}

.forecast-day {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.forecast-date {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.forecast-icon img {
    width: 64px;
    height: 64px;
    margin: var(--spacing-sm) 0;
}

.forecast-temp {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
    font-size: 1.1rem;
}

.temp-high {
    font-weight: 600;
}

.temp-low {
    color: var(--text-secondary);
}

.forecast-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: capitalize;
    margin-bottom: var(--spacing-xs);
}

.forecast-details {
    display: flex;
    justify-content: space-around;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--glass-border);
    font-size: 0.85rem;
}

.forecast-detail {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.forecast-detail-label {
    color: var(--text-tertiary);
    font-size: 0.75rem;
}

/* ==================== Hourly Section ==================== */
.hourly-section {
    padding: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.85s backwards;
}

.hourly-controls {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    padding-bottom: var(--spacing-xs);
}

.hourly-controls::-webkit-scrollbar {
    height: 4px;
}

.hourly-controls::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

.hourly-controls::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
}

.day-selector {
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: 500;
    white-space: nowrap;
}

.day-selector:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.day-selector.active {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.6) 0%, rgba(118, 75, 162, 0.6) 100%);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.hourly-scroll-container {
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
}

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

.hourly-scroll-container::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

.hourly-scroll-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
}

.hourly-forecast {
    display: flex;
    gap: var(--spacing-md);
    min-width: min-content;
}

.hourly-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    min-width: 120px;
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid transparent;
}

.hourly-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
    border-color: var(--glass-border);
}

.hourly-time {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.hourly-icon img {
    width: 48px;
    height: 48px;
    margin: var(--spacing-xs) 0;
}

.hourly-temp {
    font-size: 1.25rem;
    font-weight: 600;
    margin: var(--spacing-xs) 0;
}

.hourly-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: capitalize;
    margin-bottom: var(--spacing-xs);
}

.hourly-details {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--glass-border);
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

/* ==================== Error Message ==================== */
.error-message {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(239, 68, 68, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    z-index: 1000;
    animation: shake 0.5s ease;
    max-width: 90%;
}

@keyframes shake {
    0%, 100% { transform: translate(-50%, -50%) translateX(0); }
    25% { transform: translate(-50%, -50%) translateX(-10px); }
    75% { transform: translate(-50%, -50%) translateX(10px); }
}

.error-message p {
    font-size: 1.1rem;
    font-weight: 500;
}

/* ==================== Animations ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== Responsive Design ==================== */
@media (max-width: 1024px) {
    .current-main {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .weather-description {
        text-align: center;
    }
    
    .forecast-cards {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-container {
        flex-direction: column;
    }
    
    #searchInput {
        width: 100%;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .temp-display {
        font-size: 4rem;
    }
    
    .location-info h2 {
        font-size: 2rem;
    }
    
    .current-details {
        grid-template-columns: 1fr;
    }
    
    .forecast-cards {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
    
    .hourly-section {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .temp-display {
        font-size: 3rem;
    }
    
    .temp-unit {
        font-size: 1.5rem;
    }
    
    .weather-icon-large img {
        width: 80px;
        height: 80px;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
}