/* PicHub - Main Stylesheet v2.0 */

:root {
    /* Brand Colors */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --secondary-dark: #db2777;
    
    /* Status Colors */
    --success: #10b981;
    --success-dark: #059669;
    --danger: #ef4444;
    --danger-dark: #dc2626;
    --warning: #f59e0b;
    --warning-dark: #d97706;
    --info: #0ea5e9;
    --info-dark: #0284c7;
    
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-md: rgba(0, 0, 0, 0.15);
    --shadow-lg: rgba(0, 0, 0, 0.2);
    
    /* Gradient */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-color: #374151;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-md: rgba(0, 0, 0, 0.4);
    --shadow-lg: rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 12px var(--shadow-md);
    transition: all var(--transition-base);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: 0 6px 20px var(--shadow-lg);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* Navbar */
.navbar {
    background: var(--gradient-primary);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px var(--shadow);
    transition: all var(--transition-base);
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: white;
    font-weight: bold;
    font-size: 1.5rem;
}

.navbar-logo img {
    height: 40px;
    width: auto;
}

.navbar-nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.navbar-nav a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
}

.navbar-nav a:hover {
    opacity: 0.8;
}

.navbar-user {
    position: relative;
}

.login-toggle {
    background: rgba(255,255,255,0.2);
    border: 2px solid white;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.login-toggle:hover {
    background: rgba(255,255,255,0.3);
}

.login-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-primary);
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--shadow-md);
    min-width: 300px;
    padding: 0;
    margin-top: 0.5rem;
    display: none;
    z-index: 1001;
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.login-menu.active {
    display: block;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-form {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 0.9rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: var(--bg-primary);
}

.btn-login {
    width: 100%;
    padding: 0.75rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-base);
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.login-menu-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    background: var(--bg-secondary);
    border-radius: 0 0 8px 8px;
}

.login-menu-footer a {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-base);
}

.login-menu-footer a:hover {
    color: var(--primary-dark);
}

/* Hero Section */
.hero {
    height: 100vh;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="1200" height="600" fill="none"/><rect width="1200" height="600" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    text-align: center;
    z-index: 1;
    max-width: 600px;
    padding: 2rem;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.btn-primary {
    display: inline-block;
    padding: 1rem 2rem;
    background: white;
    color: #667eea;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background: var(--bg-secondary);
    transition: background var(--transition-base);
}

.features h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    box-shadow: 0 8px 20px var(--shadow-md);
    transform: translateY(-5px);
}

.feature-card h3 {
    margin: 1rem 0;
    color: var(--primary);
}

.feature-card p {
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.footer a {
    color: var(--primary);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Utility */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }

.hidden {
    display: none;
}

.alert {
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
    border-left: 4px solid;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border-color: var(--danger);
}

[data-theme="dark"] .alert-danger {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border-color: var(--success);
}

[data-theme="dark"] .alert-success {
    background: rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .navbar-nav {
        gap: 1rem;
    }
    
    .login-menu {
        min-width: 250px;
    }
}