:root {
    /* Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --bg-dark: #0f0f1a;
    --bg-card: rgba(255, 255, 255, 0.1);
    --bg-card-hover: rgba(255, 255, 255, 0.15);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --error-color: #ff6b6b;
    --success-color: #51cf66;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 50px;
    
    /* Shadows */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 25px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.4);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Font */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}
 
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

 
.bg-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 15s ease-in-out infinite;
}

.circle-1 {
    width: 400px;
    height: 400px;
    background: var(--primary-gradient);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.circle-2 {
    width: 300px;
    height: 300px;
    background: var(--secondary-gradient);
    bottom: 10%;
    left: -50px;
    animation-delay: -5s;
}

.circle-3 {
    width: 250px;
    height: 250px;
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    top: 50%;
    right: 20%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.05);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.95);
    }
}
 
.container {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: calc(100vh - 80px);
    display: flex;
    flex-direction: column;
    align-items: center;
}

 
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: slideDown 0.6s ease-out;
}

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

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 2.5rem;
    -webkit-text-fill-color: initial;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-top: var(--spacing-xs);
}

 
.search-section {
    width: 100%;
    margin-bottom: var(--spacing-lg);
    animation: slideUp 0.6s ease-out 0.2s both;
}

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

.search-form {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.input-wrapper {
    flex: 1;
    min-width: 200px;
    position: relative;
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 3.5rem;
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-card);
    border: 2px solid transparent;
    border-radius: var(--radius-full);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    transition: var(--transition-normal);
}

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

.search-input:focus {
    outline: none;
    border-color: rgba(102, 126, 234, 0.5);
    box-shadow: var(--shadow-glow);
    background: var(--bg-card-hover);
}

.search-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-full);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.search-btn:active {
    transform: translateY(0);
}
 
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-card);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

 
.error-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    border-radius: var(--radius-lg);
    text-align: center;
    animation: shake 0.5s ease-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-10px); }
    40% { transform: translateX(10px); }
    60% { transform: translateX(-10px); }
    80% { transform: translateX(10px); }
}

.error-icon {
    font-size: 2.5rem;
}

.error-container p {
    color: var(--error-color);
    font-weight: 500;
}

.retry-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9rem;
    font-weight: 600;
    font-family: inherit;
    background: transparent;
    border: 2px solid var(--error-color);
    border-radius: var(--radius-full);
    color: var(--error-color);
    cursor: pointer;
    transition: var(--transition-normal);
}

.retry-btn:hover {
    background: var(--error-color);
    color: var(--text-primary);
}

 
    
 
.weather-card {
    width: 100%;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    animation: fadeInScale 0.5s ease-out;
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.weather-main {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.weather-icon-container {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.weather-icon {
    font-size: 3rem;
}

.weather-info {
    flex: 1;
}

.city-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.weather-condition {
    color: var(--text-secondary);
    font-size: 1rem;
    text-transform: capitalize;
}

.temperature-display {
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.temperature {
    font-size: 5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.temp-unit {
    font-size: 2rem;
    color: var(--text-secondary);
    vertical-align: super;
}

.weather-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

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

.detail-icon {
    font-size: 1.5rem;
}

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

.detail-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

 
/* Last Searched */
   
.last-searched {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.last-searched span {
    color: var(--text-secondary);
    font-weight: 500;
}

/*  Footer */
.footer {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

.footer a:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

/*footer */
.hidden {
    display: none !important;
}

/*  Responsive Design */
@media (max-width: 600px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .logo {
        font-size: 1.8rem;
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .logo-icon {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 0.95rem;
    }
    
    .search-form {
        flex-direction: column;
    }
    
    .search-btn {
        width: 100%;
    }
    
    .temperature {
        font-size: 4rem;
    }
    
    .weather-details {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .detail-item {
        flex-direction: row;
        justify-content: flex-start;
        gap: var(--spacing-md);
    }
    
    .detail-info {
        align-items: flex-start;
        text-align: left;
    }
    
    .circle-1 {
        width: 250px;
        height: 250px;
    }
    
    .circle-2 {
        width: 200px;
        height: 200px;
    }
    
    .circle-3 {
        width: 150px;
        height: 150px;
    }
}
@media (max-width: 400px) {
    .logo {
        font-size: 1.5rem;
    }

    .temperature {
        font-size: 3.5rem;
    }
    
    .temp-unit {
        font-size: 1.5rem;
    }
}