/* ===== COMMON STYLES - CLEAN VERSION ===== */
/* Shared styles for all Join-PDFs pages */

/* ===== 1. CSS VARIABLES ===== */
:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --primary-light: #e8f4fc;
    --secondary-color: #2c3e50;
    --success-color: #2ecc71;
    --success-dark: #27ae60;
    --error-color: #e74c3c;
    --warning-color: #f39c12;
    
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-900: #212529;
    
    --text-primary: var(--gray-900);
    --text-muted: var(--gray-600);
    --bg-primary: white;
    --bg-secondary: var(--gray-100);
    --border-color: var(--gray-300);
    
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.1);
    
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    --transition-normal: 300ms ease;
    --z-modal: 1050;
    --z-toast: 1080;
}

/* ===== 2. RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: url("/images/bg-nature3.jpg") no-repeat center center fixed;
    background-size: cover;
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* ===== 3. PROFESSIONAL NAVIGATION ===== */
.pro-navbar {
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1020;
}

.pro-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.pro-nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--secondary-color);
    text-decoration: none;
}

.pro-nav-logo i {
    color: var(--error-color);
}

.pro-nav-menu {
    display: flex;
    gap: 30px;
    align-items: center;
}

.pro-nav-link {
    color: var(--text-muted);
    text-decoration: none;
    padding: 10px 0;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    transition: color var(--transition-normal);
}

.pro-nav-link:hover {
    color: var(--primary-color);
}

/* Dropdown */
.pro-nav-dropdown {
    position: relative;
}

.pro-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: -20px;
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-lg);
    padding: 15px 0;
    min-width: 220px;
    z-index: 1000;
    border: 1px solid var(--border-color);
}

.pro-nav-dropdown:hover .pro-dropdown-menu {
    display: block;
}

.pro-dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 25px;
    color: var(--text-primary);
    text-decoration: none;
}

.pro-dropdown-menu a:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

/* Mobile Menu */
.pro-hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    flex-direction: column;
    gap: 4px;
}

.pro-hamburger span {
    width: 25px;
    height: 3px;
    background: var(--secondary-color);
    border-radius: 2px;
    transition: var(--transition-normal);
}

.pro-hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.pro-hamburger.active span:nth-child(2) {
    opacity: 0;
}

.pro-hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

.pro-mobile-menu {
    display: none;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg);
}

.pro-mobile-menu.active {
    display: block;
}

.pro-mobile-menu a {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 6px;
}

.pro-mobile-menu a:hover {
    background: var(--bg-secondary);
}

.pro-mobile-dropdown-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px;
    background: none;
    border: none;
    cursor: pointer;
}

.pro-mobile-dropdown-content {
    display: none;
    padding-left: 30px;
}

.pro-mobile-dropdown-content.active {
    display: block;
}

/* ===== 4. BUTTONS ===== */
.btn-primary, .btn-secondary, .browse-btn, .btn-download {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    font-size: var(--font-size-base);
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--success-dark);
    transform: translateY(-2px);
}

.btn-primary:disabled {
    background: var(--gray-600);
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--gray-600);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-700);
    transform: translateY(-2px);
}

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

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

.btn-download {
    background: var(--success-color);
    color: white;
    text-decoration: none;
}

/* ===== 5. UPLOAD AREA ===== */
.upload-area {
    border: 3px dashed var(--primary-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xxl) var(--spacing-lg);
    text-align: center;
    background: #f8fafc;
    margin-bottom: var(--spacing-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.upload-area:hover {
    background: var(--primary-light);
}

.upload-area.dragover {
    background: var(--primary-light);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.upload-area h3 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
}

.upload-hint {
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

/* ===== 6. INFO BOXES ===== */
.upload-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xxl);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.info-box {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    min-width: 150px;
}

.info-box i {
    font-size: var(--font-size-3xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

/* ===== 7. STATS BAR ===== */
.stats-bar {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xxl);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
}

.stat {
    text-align: center;
}

.stat-label {
    display: block;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.stat-value {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--secondary-color);
}

/* ===== 8. OVERLAYS ===== */
.progress-overlay, .success-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: var(--z-modal);
}

.progress-content, .success-content {
    text-align: center;
    max-width: 500px;
    padding: 40px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

/* ===== 9. NOTIFICATIONS ===== */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: var(--z-toast);
    transform: translateX(150%);
    transition: transform 0.3s ease;
    border-left: 4px solid var(--primary-color);
}

.notification.show {
    transform: translateX(0);
}

.notification.success { border-left-color: var(--success-color); }
.notification.error { border-left-color: var(--error-color); }
.notification.warning { border-left-color: var(--warning-color); }

/* ===== 10. THEME TOGGLE ===== */
.theme-toggle {
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: scale(1.1);
}

/* ===== 11. DARK MODE ===== */
body.dark-mode {
    --text-primary: #f1f5f9;
    --text-muted: #94a3b8;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --border-color: #475569;
    --primary-color: #3b82f6;
}

body.dark-mode {
    background: linear-gradient(rgba(0,0,0,0.55), rgba(0,0,0,0.55)),
        url("/images/bg-nature2.jpg") no-repeat center center fixed;
    background-size: cover;
}

body.dark-mode .upload-area {
    background: var(--bg-secondary);
}

body.dark-mode .progress-overlay,
body.dark-mode .success-overlay {
    background: rgba(0,0,0,0.9);
}

body.dark-mode .progress-content,
body.dark-mode .success-content,
body.dark-mode .notification {
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* ===== 12. RESPONSIVE ===== */
@media (max-width: 992px) {
    .pro-nav-menu {
        display: none;
    }
    .pro-hamburger {
        display: flex;
    }
    .pro-nav-menu .theme-toggle {
        display: none !important;
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-lg);
    }
    .upload-info {
        flex-direction: column;
        align-items: center;
    }
    .action-buttons {
        flex-direction: column;
    }
    .stats-bar {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .upload-info {
        flex-direction: column;
        align-items: center;
    }
    .info-box {
        width: 100%;
        max-width: 250px;
    }
}

/* ===== 13. UTILITIES ===== */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.badge {
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--text-muted);
    border-top: 1px solid rgba(0,0,0,0.1);
}

.main-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-xxl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}