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

:root {
    --primary-color: #4a90e2;
    --secondary-color: #50c878;
    --background-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-background: rgba(255, 255, 255, 0.95);
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    --shadow-hover: 0 15px 40px rgba(0, 0, 0, 0.3);
    --border-radius: 20px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background-gradient);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--text-primary);
}

.container {
    width: 100%;
    max-width: 500px;
    animation: fadeIn 0.5s ease-in;
}

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

header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

header h1 i {
    margin-right: 10px;
    color: #ffd700;
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
}

.search-container {
    margin-bottom: 25px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 15px 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.search-box:focus-within {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.search-box i.fa-search {
    color: var(--text-secondary);
    margin-right: 15px;
    font-size: 1.2rem;
}

.search-box input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1rem;
    background: transparent;
    color: var(--text-primary);
}

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

.search-box button {
    background: var(--primary-color);
    border: none;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    color: white;
    margin-left: 10px;
}

.search-box button:hover {
    background: #357abd;
    transform: scale(1.1);
}

.search-box button:active {
    transform: scale(0.95);
}

.error-message {
    background: #e74c3c;
    color: white;
    padding: 15px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    text-align: center;
    display: none;
    animation: shake 0.5s;
}

.error-message.show {
    display: block;
}

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

.weather-card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 25px;
    animation: slideUp 0.5s ease-out;
}

.weather-card.hidden {
    display: none;
}

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

.weather-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 2px solid #ecf0f1;
}

.city-info h2 {
    font-size: 1.8rem;
    margin-bottom: 5px;
    color: var(--text-primary);
}

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

.weather-icon {
    font-size: 4rem;
    color: var(--primary-color);
}

.weather-main {
    text-align: center;
    margin-bottom: 30px;
}

.temperature {
    font-size: 4.5rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.unit {
    font-size: 2rem;
    margin-left: 5px;
    color: var(--text-secondary);
}

.description {
    font-size: 1.3rem;
    color: var(--text-secondary);
    text-transform: capitalize;
    margin-bottom: 25px;
}

.weather-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 15px;
    transition: var(--transition);
}

.detail-item:hover {
    background: #e9ecef;
    transform: translateY(-2px);
}

.detail-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    width: 30px;
    text-align: center;
}

.detail-content {
    display: flex;
    flex-direction: column;
}

.detail-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

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

.demo-cities {
    margin-top: 20px;
}

.demo-label {
    color: white;
    text-align: center;
    margin-bottom: 15px;
    font-size: 0.9rem;
    opacity: 0.9;
}

.city-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.city-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.city-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

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

@media (max-width: 600px) {
    header h1 {
        font-size: 2rem;
    }

    .temperature {
        font-size: 3.5rem;
    }

    .weather-details {
        grid-template-columns: 1fr;
    }

    .weather-card {
        padding: 20px;
    }
}