/* CNN Playground - Global Styles */

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

:root {
    /* Light mode variables */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --panel-bg: rgba(255, 255, 255, 0.95);
    --panel-border: rgba(139, 92, 246, 0.1);
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --upload-bg: rgba(139, 92, 246, 0.05);
    --upload-border: #c4b5fd;
    --accent-color: #8b5cf6;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
}

[data-theme="dark"] {
    /* Dark mode variables */
    --bg-primary: #1e293b;
    --bg-secondary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #475569;
    --panel-bg: rgba(51, 65, 85, 0.95);
    --panel-border: rgba(59, 130, 246, 0.2);
    --shadow-light: rgba(0, 0, 0, 0.2);
    --shadow-medium: rgba(0, 0, 0, 0.3);
    --upload-bg: rgba(59, 130, 246, 0.1);
    --upload-border: #60a5fa;
    --accent-color: #60a5fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    min-height: 100vh;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    padding: 0;
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.3);
    position: relative;
    transition: all 0.3s ease;
}

[data-theme="dark"] .navbar {
    background: linear-gradient(135deg, #0f172a, #1e293b);
    box-shadow: 0 8px 32px rgba(15, 23, 42, 0.6);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
}

.logo {
    color: white;
    font-size: 1.6em;
    font-weight: 700;
    padding: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.logo a {
    color: white;
    text-decoration: none;
}

.nav-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-tabs {
    display: flex;
}

.nav-tab {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: 20px 30px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1em;
    border-bottom: 3px solid transparent;
    position: relative;
    overflow: hidden;
}

.nav-tab::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.6s;
}

.nav-tab:hover::before {
    left: 100%;
}

.nav-tab:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateY(-2px);
}

.nav-tab.active {
    color: white;
    border-bottom-color: #a78bfa;
    background: rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] .nav-tab.active {
    border-bottom-color: #94a3b8;
    background: rgba(255, 255, 255, 0.1);
}

.theme-toggle {
    margin-left: auto;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 10px 15px;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2em;
    margin-right: 20px;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}

/* Page Content */
.page-content {
    background: var(--panel-bg);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px var(--shadow-medium);
    border: 1px solid var(--panel-border);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Page Header */
.page-header {
    text-align: center;
    margin-bottom: 40px;
}

.page-header h1 {
    background: linear-gradient(135deg, #8B5CF6, #A855F7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
    font-size: 2.5em;
    font-weight: 700;
}

[data-theme="dark"] .page-header h1 {
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.2em;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.3s;
}

/* Common Components */
.section {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 25px var(--shadow-light);
    border: 1px solid var(--border-color);
    margin-bottom: 30px;
    transition: all 0.3s ease;
}

.section:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px var(--shadow-medium);
}

.section h2 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.4em;
    font-weight: 600;
}

.section h3 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 1.2em;
    font-weight: 600;
}

/* Buttons */
.btn {
    background: linear-gradient(135deg, var(--accent-color), #a855f7);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 25px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(139, 92, 246, 0.3);
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .btn {
    background: linear-gradient(135deg, #3b82f6, #1e40af);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.3);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.4);
}

[data-theme="dark"] .btn:hover {
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.btn:disabled {
    background: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.btn.btn-danger {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    box-shadow: 0 5px 15px rgba(239, 68, 68, 0.3);
}

.btn.btn-danger:hover {
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.4);
}

.btn.btn-success {
    background: linear-gradient(135deg, #10b981, #059669);
    box-shadow: 0 5px 15px rgba(16, 185, 129, 0.3);
}

.btn.btn-success:hover {
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
}

/* Form Elements */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group select, .form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1em;
    transition: all 0.3s ease;
}

.form-group select:focus, .form-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

[data-theme="dark"] .form-group select:focus,
[data-theme="dark"] .form-group input:focus {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Status Messages */
.status-message {
    padding: 18px 25px;
    border-radius: 12px;
    margin: 25px 0;
    font-weight: 500;
    opacity: 0;
    transform: translateY(-10px);
    animation: slideDown 0.5s ease forwards;
}

@keyframes slideDown {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.status-success {
    background: linear-gradient(135deg, #10B981, #059669);
    color: white;
    border: none;
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.3);
}

.status-error {
    background: linear-gradient(135deg, #EF4444, #DC2626);
    color: white;
    border: none;
    box-shadow: 0 10px 25px rgba(239, 68, 68, 0.3);
}

.status-warning {
    background: linear-gradient(135deg, #F59E0B, #D97706);
    color: white;
    border: none;
    box-shadow: 0 10px 25px rgba(245, 158, 11, 0.3);
}

/* Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

.mt-0 { margin-top: 0; }
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }

.mb-0 { margin-bottom: 0; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }

.hidden { display: none; }
.visible { opacity: 1; }

/* Responsive Design */
@media (max-width: 768px) {
    .nav-tabs {
        flex-wrap: wrap;
    }

    .nav-tab {
        padding: 15px 20px;
        font-size: 0.9em;
    }

    .container {
        padding: 0 15px;
    }

    .page-content {
        padding: 25px;
    }

    .page-header h1 {
        font-size: 2em;
    }
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}