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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

:root {
    --primary: #4A90D9;
    --primary-dark: #357ABD;
    --secondary: #f0f4f8;
    --shadow: 0 4px 15px rgba(0,0,0,0.1);
    --radius: 12px;
    --transition: all 0.3s ease;
}

/* Navigation */
.navbar {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.nav-links a {
    color: #555;
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 25px;
    transition: var(--transition);
    font-size: 0.9rem;
}

.nav-links a:hover, .nav-links a.active {
    background: var(--primary);
    color: white;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background: #333;
    border-radius: 3px;
    transition: var(--transition);
}

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, #6C5CE7 100%);
    color: white;
    text-align: center;
    padding: 60px 20px;
}

.hero h1 {
    font-size: 2rem;
    margin-bottom: 15px;
    font-weight: 600;
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 25px;
    opacity: 0.9;
}

.hero-search {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.hero-search input {
    padding: 14px 20px;
    border: none;
    border-radius: 30px;
    width: 60%;
    min-width: 250px;
    font-size: 1rem;
    box-shadow: var(--shadow);
}

.hero-search button {
    padding: 14px 30px;
    border: none;
    border-radius: 30px;
    background: #FF6B6B;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.hero-search button:hover {
    background: #ff5252;
    transform: translateY(-2px);
}

/* Weather Section */
.weather-section {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.weather-section h2 {
    margin-bottom: 25px;
    color: var(--primary);
    font-size: 1.8rem;
}

.weather-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.weather-card {
    background: white;
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-top: 4px solid var(--primary);
}

.weather-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.weather-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #333;
}

.weather-card .temp {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary);
}

.weather-card .detail {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
    color: #666;
}

.loading {
    text-align: center;
    padding: 40px;
    font-size: 1.2rem;
    color: #666;
}

/* Features */
.features-section {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.features-section h2 {
    margin-bottom: 25px;
    color: var(--primary);
    font-size: 1.8rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.feature-card {
    background: white;
    border-radius: var(--radius);
    padding: 25px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.feature-card h3 {
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.feature-card p {
    color: #666;
    font-size: 0.95rem;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 30px 20px;
    margin-top: 40px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 15px;
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

/* Admin */
.admin-container {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

.login-form, .admin-dashboard {
    background: white;
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
}

.login-form h2, .admin-dashboard h2 {
    margin-bottom: 20px;
    color: var(--primary);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #555;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="color"] {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(74,144,217,0.2);
}

.checkbox-group label {
    display: inline-block;
    margin-right: 20px;
    font-weight: normal;
}

.btn-primary {
    padding: 12px 30px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.alert {
    padding: 12px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.alert-error {
    background: #ffe0e0;
    color: #c0392b;
}

.alert-success {
    background: #d4edda;
    color: #155724;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background: white;
        position: absolute;
        top: 60px;
        left: 0;
        padding: 20px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero-search input {
        width: 100%;
    }

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

    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* Page specific styles */
.page-container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.page-container h1 {
    color: var(--primary);
    margin-bottom: 20px;
    font-size: 2rem;
}

.page-container p {
    color: #666;
    margin-bottom: 20px;
}

.page-container .tool-card {
    background: white;
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    transition: var(--transition);
}

.page-container .tool-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
}

.page-container .tool-card h3 {
    color: var(--primary);
    margin-bottom: 15px;
}

.page-container .tool-card input,
.page-container .tool-card select {
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    margin-right: 10px;
    margin-bottom: 10px;
}

.page-container .tool-card button {
    padding: 10px 20px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.page-container .tool-card button:hover {
    background: var(--primary-dark);
}

.page-container .result {
    margin-top: 15px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
}

.chart-container {
    max-width: 800px;
    margin: 20px auto;
}