/* Sunset Theme CSS Variables */
:root {
    /* Sunset Colors - Warm Gradient Palette */
    --sunset-orange: #ff6b35;
    --sunset-coral: #f7931e;
    --sunset-peach: #ffb347;
    --sunset-pink: #ff8c94;
    --sunset-purple: #9b59b6;
    --sunset-deep: #2c1810;
    --sunset-dusk: #4a2c2a;
    --sunset-dawn: #6b4423;
    
    /* Primary Colors - Sunset Gradient */
    --primary-600: #ff6b35;
    --primary-700: #e55a2b;
    --primary-500: #ff8c47;
    --primary-400: #ffb347;
    --primary-100: #ffe4d6;
    --primary-50: #fff2ed;
    
    /* Warm Neutral Colors */
    --gray-900: #2c1810;
    --gray-800: #4a2c2a;
    --gray-700: #6b4423;
    --gray-600: #8b5a3c;
    --gray-500: #a67c52;
    --gray-400: #c19a6b;
    --gray-300: #d4b896;
    --gray-200: #e8d5c4;
    --gray-100: #f2e6dc;
    --gray-50: #faf7f4;
    
    /* Semantic Colors - Warm Tones */
    --success-600: #27ae60;
    --success-100: #d5f4e6;
    --error-600: #e74c3c;
    --error-100: #fadbd8;
    --warning-600: #f39c12;
    --warning-100: #fef5e7;
    
    /* Background & Surface - Darker Theme */
    --bg-primary: #2c1810;
    --bg-secondary: #4a2c2a;
    --bg-tertiary: #6b4423;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-glass: rgba(255, 255, 255, 0.1);
    
    /* Text Colors - Light on Dark */
    --text-primary: #faf7f4;
    --text-secondary: #d4b896;
    --text-muted: #c19a6b;
    --text-inverse: #2c1810;
    
    /* Border & Dividers - Warm Theme */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    
    /* Shadows - Enhanced with Warm Glow */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(255, 107, 53, 0.3);
    --shadow-sunset: 0 8px 32px rgba(255, 107, 53, 0.2);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Animation */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* Modern Reset & Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 107, 53, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 140, 71, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 179, 71, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* Container & Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-sm {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Modern Header with Blur */
header {
    background: rgba(44, 24, 16, 0.8);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    min-height: 4rem;
}

.logo h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-600);
}

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

.logo a:hover {
    color: var(--primary-700);
}

/* Modern Navigation */
nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

nav ul li a,
nav ul li form.logout-form button {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

nav ul li form.logout-form {
    display: inline;
    margin: 0;
}

nav ul li a:hover,
nav ul li form.logout-form button:hover {
    color: var(--primary-600);
    background-color: rgba(255, 107, 53, 0.1);
}

/* Main Content Area */
main {
    min-height: calc(100vh - 5rem);
    padding: var(--space-xl) 0;
}

/* Modern Footer */
footer {
    background-color: var(--gray-900);
    color: var(--text-secondary);
    text-align: center;
    padding: var(--space-xl) 0;
    margin-top: var(--space-3xl);
}

footer p {
    margin: 0;
    opacity: 0.8;
    font-size: 0.875rem;
}

/* Modern Form Styles */
.form-container {
    max-width: 400px;
    margin: 0 auto;
    padding: var(--space-xl);
}

.form-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sunset);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.form-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--sunset-peach), transparent);
}

.form-card h2 {
    margin: 0 0 var(--space-xl) 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.form-input {
    width: 100%;
    padding: var(--space-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.2), var(--shadow-glow);
}

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

/* Modern Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 2.5rem;
    gap: var(--space-sm);
}

.btn-primary {
    background-color: var(--primary-600);
    color: var(--text-inverse);
}

.btn-primary:hover {
    background-color: var(--primary-700);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--border-hover);
}

.btn-full {
    width: 100%;
}

.btn-lg {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1rem;
    min-height: 3rem;
}

.btn-sm {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.75rem;
    min-height: 2rem;
}

/* Glass Morphism Card Component */
.card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 179, 71, 0.4), transparent);
}

.card:hover {
    box-shadow: var(--shadow-sunset);
    transform: translateY(-4px) scale(1.02);
    border-color: var(--border-hover);
}

.card-body {
    padding: var(--space-xl);
    position: relative;
}

/* File Management Styles */
.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
    align-items: start;
}

.file-item {
    display: flex;
    align-items: flex-start;
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-glass);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    transition: all var(--transition-fast);
    min-height: auto;
    height: auto;
}

.file-item:hover {
    border-color: var(--primary-400);
    box-shadow: var(--shadow-sunset);
    transform: translateY(-2px);
}

.file-icon {
    width: 2.5rem;
    height: 2.5rem;
    background-color: rgba(255, 107, 53, 0.1);
    border-radius: var(--radius-md);
    margin-right: var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-600);
    flex-shrink: 0;
}

.file-info {
    flex: 1;
    min-width: 0;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
    margin: 0 0 var(--space-xs) 0;
    word-break: break-word;
    hyphens: auto;
}

.file-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.file-meta p {
    margin: var(--space-xs) 0;
    word-break: break-word;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(
        135deg,
        var(--sunset-orange) 0%,
        var(--sunset-coral) 25%,
        var(--sunset-peach) 50%,
        var(--sunset-pink) 75%,
        var(--sunset-purple) 100%
    );
    color: var(--text-inverse);
    padding: var(--space-3xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sunset);
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin: 0 0 var(--space-lg) 0;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin: 0 0 var(--space-2xl) 0;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Utility Classes */
.text-center { text-align: center; }
.font-semibold { font-weight: 600; }
.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-lg { margin-bottom: var(--space-lg); }
.mt-lg { margin-top: var(--space-lg); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-primary-600 { color: var(--primary-600); }

/* Alert Styles */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.alert-error {
    background-color: var(--error-100);
    color: var(--error-600);
    border: 1px solid #fecaca;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-md);
    }
    
    nav ul {
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--space-sm);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .form-container {
        padding: var(--space-md);
    }
    
    .form-card {
        padding: var(--space-lg);
    }
    
    .file-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container,
    .container-sm {
        padding: 0 var(--space-md);
    }
    
    .btn {
        padding: var(--space-sm) var(--space-lg);
    }
    
    .card-body {
        padding: var(--space-md);
    }
}