* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #0f0f14;
    --bg-gradient: linear-gradient(135deg, #0f0f14 0%, #1a1a24 50%, #0f0f14 100%);
    --card: #1a1a24;
    --card-hover: #21212e;
    --border: #2d2d3a;
    --border-hover: #3d3d4a;
    --text: #e8e8ed;
    --text-muted: #8888a0;
    --accent: #818cf8;
    --accent-hover: #a5b4fc;
    --accent-glow: rgba(129, 140, 248, 0.3);
    --error: #f85149;
    --error-glow: rgba(248, 81, 73, 0.2);
    --success: #3fb950;
    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration: 0.25s;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 32px var(--accent-glow);
}

body {
    font-family: 'Outfit', sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text);
    padding: 1.5rem;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(129, 140, 248, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(129, 140, 248, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.app {
    width: 100%;
    max-width: 380px;
    position: relative;
    z-index: 1;
    animation: fadeIn 0.6s var(--ease);
}

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

/* Header */
.header {
    text-align: center;
    margin-bottom: 1.5rem;
    animation: slideDown 0.6s var(--ease) 0.1s both;
}

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

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* Search */
.search-section {
    margin-bottom: 1.25rem;
    animation: slideUp 0.6s var(--ease) 0.2s both;
}

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

.search-form {
    display: flex;
    gap: 0.75rem;
}

#cityInput {
    flex: 1;
    padding: 1rem 1.25rem;
    font-family: inherit;
    font-size: 1rem;
    background: var(--card);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    transition: all var(--duration) var(--ease);
    box-shadow: var(--shadow-sm);
}

#cityInput:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

#cityInput:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow), var(--shadow-md);
    transform: translateY(-1px);
}

#cityInput::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

.btn-search {
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    border: none;
    border-radius: var(--radius);
    color: #fff;
    cursor: pointer;
    transition: all var(--duration) var(--ease);
    box-shadow: 0 4px 12px rgba(129, 140, 248, 0.3);
    font-size: 1rem;
}

.btn-search:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 20px rgba(129, 140, 248, 0.4);
}

.btn-search:active {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 8px rgba(129, 140, 248, 0.3);
}

.btn-location {
    width: 100%;
    margin-top: 0.75rem;
    padding: 0.875rem 1rem;
    background: var(--card);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration) var(--ease);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
}

.btn-location:hover:not(:disabled) {
    background: var(--card-hover);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-location:active:not(:disabled) {
    transform: translateY(0);
}

.btn-location:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-location i {
    color: var(--accent);
    transition: transform var(--duration) var(--ease);
}

.btn-location:hover:not(:disabled) i {
    transform: scale(1.1) rotate(5deg);
}

/* Tamil Nadu Cities */
.tamilnadu-cities {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    animation: slideUp 0.6s var(--ease) 0.3s both;
}

.cities-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    font-weight: 500;
    text-align: center;
}

.city-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 0.5rem;
}

.city-btn {
    padding: 0.625rem 0.75rem;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration) var(--ease);
    box-shadow: var(--shadow-sm);
}

.city-btn:hover {
    background: var(--card-hover);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.city-btn:active {
    transform: translateY(0);
}

/* Weather card */
.weather-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--duration) var(--ease);
    animation: cardSlideIn 0.6s var(--ease) 0.3s both;
    position: relative;
    overflow: hidden;
}

@keyframes cardSlideIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.weather-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-hover) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.6s var(--ease);
}

.weather-card:hover::before {
    transform: scaleX(1);
}

.weather-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--border-hover);
}

.weather-header {
    margin-bottom: 1.25rem;
}

.city-name {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text);
    letter-spacing: -0.01em;
}

.date {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 400;
}

.weather-main {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
    padding: 0.5rem 0;
}

.temperature {
    display: flex;
    align-items: flex-start;
    gap: 0.2rem;
}

.temp-value {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1;
    background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: tempPulse 2s ease-in-out infinite;
}

@keyframes tempPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.02);
    }
}

.temp-unit {
    font-size: 1.4rem;
    font-weight: 500;
    opacity: 0.8;
    color: var(--text-muted);
}

.weather-icon {
    font-size: 3.5rem;
    color: var(--accent);
    filter: drop-shadow(0 4px 12px var(--accent-glow));
    animation: iconFloat 3s ease-in-out infinite;
    transition: transform var(--duration) var(--ease);
}

@keyframes iconFloat {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-8px) rotate(5deg);
    }
}

.weather-card:hover .weather-icon {
    transform: scale(1.1) rotate(10deg);
    animation-play-state: paused;
}

.weather-description {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    text-transform: capitalize;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.weather-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.75rem;
    background: rgba(45, 45, 58, 0.3);
    border-radius: var(--radius);
    transition: all var(--duration) var(--ease);
    border: 1px solid transparent;
}

.detail-item:hover {
    background: rgba(45, 45, 58, 0.5);
    border-color: var(--border);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.detail-item i {
    font-size: 1.1rem;
    color: var(--accent);
    margin-bottom: 0.15rem;
    transition: transform var(--duration) var(--ease);
}

.detail-item:hover i {
    transform: scale(1.1);
}

.detail-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.detail-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

/* Error */
.error-message {
    background: var(--card);
    border: 2px solid var(--error);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    text-align: center;
    color: var(--error);
    box-shadow: 0 0 24px var(--error-glow), var(--shadow-md);
    animation: shake 0.5s var(--ease);
}

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

.error-message i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* Loading */
.loading {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 4rem 3rem;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border);
    border-top-color: var(--accent);
    border-right-color: var(--accent);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    animation: spin 0.8s linear infinite;
    box-shadow: 0 0 20px var(--accent-glow);
}

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

.loading p {
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 500;
    animation: fadeInOut 1.5s ease-in-out infinite;
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Footer */
.footer {
    margin-top: 2.5rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    animation: fadeIn 0.8s var(--ease) 0.4s both;
}

.footer a {
    color: var(--accent);
    text-decoration: none;
    transition: all var(--duration) var(--ease);
    font-weight: 500;
    position: relative;
}

.footer a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--duration) var(--ease);
}

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

.footer a:hover::after {
    width: 100%;
}

.footer-note {
    margin-top: 0.75rem;
    font-size: 0.75rem;
    opacity: 0.8;
}

/* Responsive */
@media screen and (max-width: 480px) {
    .app {
        max-width: 100%;
    }

    .header h1 {
        font-size: 2rem;
    }

    .temp-value {
        font-size: 2.5rem;
    }

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

    .weather-card {
        padding: 1.25rem;
    }

    .weather-details {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }
}

@media screen and (max-width: 360px) {
    .weather-details {
        grid-template-columns: 1fr;
    }
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* Focus visible for accessibility */
*:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}