/* NEETUG File Share - Modern Minimalist Design */

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --bg: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text: #111827;
    --text-secondary: #6b7280;
    --border: #e5e7eb;
    --shadow: rgba(0, 0, 0, 0.1);
    --radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg-secondary);
}

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

/* Navbar */
.navbar {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary);
}

/* Flash Messages */
.flash {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: var(--radius);
    font-weight: 500;
}

.flash-success {
    background: #d1fae5;
    color: #065f46;
}

.flash-error {
    background: #fee2e2;
    color: #991b1b;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 5rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

/* Features */
.features {
    padding: 4rem 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: var(--bg);
    padding: 2rem;
    border-radius: var(--radius);
    text-align: center;
    border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

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

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

.btn-danger {
    background: var(--error);
    color: white;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.875rem;
    display: inline-block;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    margin: 0 0.25rem;
}

.btn-sm:hover {
    background: var(--primary-dark);
}

/* Auth Pages */
.auth-container {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 0;
}

.auth-box {
    background: var(--bg);
    padding: 3rem;
    border-radius: var(--radius);
    box-shadow: 0 4px 20px var(--shadow);
    max-width: 450px;
    width: 100%;
}

.auth-box h1 {
    margin-bottom: 2rem;
    text-align: center;
    font-size: 2rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-help {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.form-card {
    background: var(--bg);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-top: 1rem;
}

/* Dashboard */
.dashboard {
    padding: 2rem 0;
    min-height: 70vh;
}

.dashboard-header {
    margin-bottom: 2rem;
}

.dashboard-header h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.dashboard-nav {
    display: flex;
    gap: 1rem;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0.5rem;
}

.dashboard-nav a {
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.2s;
}

.dashboard-nav a:hover,
.dashboard-nav a.active {
    color: var(--primary);
    background: var(--bg-tertiary);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Dashboard Section */
.dashboard-section {
    background: var(--bg);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 2rem;
}

.dashboard-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

/* Upload Card */
.upload-card {
    background: var(--bg-tertiary);
    padding: 2rem;
    border-radius: var(--radius);
}

.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 3rem;
    text-align: center;
    transition: all 0.2s;
    position: relative;
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--primary);
    background: var(--bg);
}

.upload-area input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.upload-text p {
    margin-bottom: 0.5rem;
}

.upload-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table thead {
    background: var(--bg-tertiary);
}

.data-table th {
    text-align: left;
    padding: 1rem;
    font-weight: 600;
    border-bottom: 2px solid var(--border);
}

.data-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.data-table tbody tr:hover {
    background: var(--bg-secondary);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.badge-error {
    background: #fee2e2;
    color: #991b1b;
}

.badge-info {
    background: #dbeafe;
    color: #1e40af;
}

/* Toggle Button */
.toggle-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 28px;
    border: 2px solid #cbd5e0;
    border-radius: 14px;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.65rem;
    background: #e2e8f0;
    color: #64748b;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.toggle-btn:hover {
    border-color: #94a3b8;
    transform: scale(1.05);
}

.toggle-btn.active {
    background: var(--success);
    border-color: var(--success);
    color: white;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.toggle-btn.active:hover {
    background: #059669;
    border-color: #059669;
}

/* Settings */
.settings-grid {
    display: grid;
    gap: 2rem;
}

.settings-section {
    background: var(--bg);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.info-card {
    background: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: var(--radius);
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    font-weight: 600;
    color: var(--text-secondary);
}

/* Download Page */
.download-page {
    min-height: 70vh;
    display: flex;
    align-items: center;
    padding: 3rem 0;
}

.download-card {
    background: var(--bg);
    padding: 3rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.file-icon-large {
    font-size: 5rem;
    margin-bottom: 1rem;
}

.download-card h1 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    word-break: break-word;
}

.file-details {
    background: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: var(--radius);
    margin: 2rem 0;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
}

.detail-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.report-form {
    background: var(--bg-tertiary);
    padding: 2rem;
    border-radius: var(--radius);
    margin-top: 2rem;
    text-align: left;
}

.report-form h3 {
    margin-bottom: 1rem;
}

/* Analytics */
.analytics-header {
    background: var(--bg);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 2rem;
}

.analytics-grid {
    display: grid;
    gap: 2rem;
}

.analytics-section {
    background: var(--bg);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.analytics-section h3 {
    margin-bottom: 1.5rem;
}

.chart-container {
    height: 300px;
    position: relative;
}

.analytics-insights {
    background: var(--bg);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.insight-card {
    background: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: var(--radius);
    text-align: center;
}

.insight-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.insight-card h4 {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.insight-card p {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

/* Error Pages */
.error-page {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

.error-container {
    max-width: 600px;
}

.error-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--error);
}

.error-code {
    font-size: 8rem;
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
    margin: 1rem 0;
}

.error-heading {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.error-message {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    border-left: 4px solid;
}

.alert-success {
    background: #d1fae5;
    border-color: var(--success);
    color: #065f46;
}

.alert-error {
    background: #fee2e2;
    border-color: var(--error);
    color: #991b1b;
}

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

.footer p {
    margin: 0.5rem 0;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

/* Status Select */
.status-select {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .dashboard-nav {
        flex-wrap: wrap;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .auth-box {
        padding: 2rem;
    }
    
    .download-card {
        padding: 2rem;
    }
    
    .error-code {
        font-size: 5rem;
    }
}

/* Loading Animation */
@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading {
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 0.8s linear infinite;
    margin: 2rem auto;
}