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

:root {
    /* Dark Mode Colors */
    --bg-primary: #09090b;
    --bg-secondary: #18181b;
    --bg-tertiary: #27272a;
    --bg-card: #27272a;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    
    /* Accent Colors */
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-tertiary: #ec4899;
    
    /* Border & Divider */
    --border-color: #3f3f46;
    --border-subtle: #27272a;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-dark: linear-gradient(135deg, #1e1b4b 0%, #2d1b69 50%, #3d0a52 100%);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ======================== Navbar ======================== */

/* Navbar */
.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(24, 24, 27, 0.8);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: opacity 0.3s ease;
}

.navbar-title:hover {
    opacity: 0.8;
}

.navbar-icon {
    font-size: 1.75rem;
}

.navbar-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* ======================== Buttons ======================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}

.btn-nav {
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid transparent;
    padding: 0.5rem 1rem;
}

.btn-nav:hover {
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-nav-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: 0.6rem 1.5rem;
}

.btn-nav-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 10px 40px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(59, 130, 246, 0.4);
}

.btn-outline {
    color: var(--text-primary);
    background: transparent;
    border: 2px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--accent-primary);
    background: rgba(59, 130, 246, 0.1);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
    border-radius: 0.875rem;
}

.btn-block {
    width: 100%;
    display: flex;
    justify-content: center;
}

.btn-arrow {
    transition: transform 0.3s ease;
}

.btn-primary:hover .btn-arrow {
    transform: translateX(4px);
}

/* ======================== Hero Section ======================== */
.hero {
    position: relative;
    overflow: hidden;
    padding: 8rem 2rem;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: var(--gradient-dark);
    opacity: 0.6;
    z-index: 0;
}

.hero::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
    top: -200px;
    right: -100px;
    z-index: 0;
}

.hero::after {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
    bottom: -150px;
    left: -100px;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 2rem;
    color: var(--accent-primary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ======================== Features Section ======================== */
.features {
    padding: 6rem 2rem;
    background-color: var(--bg-primary);
}

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

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

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

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: linear-gradient(135deg, rgba(39, 39, 42, 0.8) 0%, rgba(39, 39, 42, 0.5) 100%);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 1.25rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0) 0%, rgba(139, 92, 246, 0.1) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-primary);
    box-shadow: 0 20px 50px rgba(59, 130, 246, 0.2);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-card > * {
    position: relative;
    z-index: 1;
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: white;
    transition: all 0.3s ease;
}

.feature-icon-upload {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.4), rgba(59, 130, 246, 0.2));
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
}

.feature-icon-link {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.4), rgba(139, 92, 246, 0.2));
    box-shadow: 0 0 30px rgba(139, 92, 246, 0.3);
}

.feature-icon-users {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.4), rgba(236, 72, 153, 0.2));
    box-shadow: 0 0 30px rgba(236, 72, 153, 0.3);
}

.feature-icon-security {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.4), rgba(34, 197, 94, 0.2));
    box-shadow: 0 0 30px rgba(34, 197, 94, 0.3);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    stroke-width: 2;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* ======================== CTA Section ======================== */
.cta-section {
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-top: 1px solid var(--border-color);
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* ======================== Footer ======================== */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    color: var(--text-tertiary);
}

/* ======================== Auth Pages ======================== */
.auth-container {
    max-width: 400px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.auth-form {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 1.25rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.auth-form h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.75rem;
}

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

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

.form-group input {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    background-color: rgba(39, 39, 42, 0.8);
}

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

/* ======================== Messages ======================== */
.message {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    display: none;
}

.message.success {
    background-color: rgba(34, 197, 94, 0.1);
    color: #86efac;
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.message.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* ======================== Dashboard ======================== */
.dashboard-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.upload-section {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 1.25rem;
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.upload-section h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 0.75rem;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background-color: var(--bg-tertiary);
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--accent-primary);
    background-color: rgba(59, 130, 246, 0.05);
}

.upload-icon {
    width: 3rem;
    height: 3rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

/* ======================== Responsive Design ======================== */
@media (max-width: 768px) {
    .navbar-container {
        flex-direction: column;
        gap: 1rem;
    }

    .navbar-links {
        width: 100%;
        justify-content: space-between;
    }

    .hero {
        padding: 4rem 1rem;
        min-height: auto;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn-large {
        width: 100%;
    }

    .section-title {
        font-size: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .features {
        padding: 3rem 1rem;
    }

    .auth-form {
        padding: 1.5rem;
    }
}

/* ======================== Accessibility ======================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #f8f9fa;
        --bg-secondary: #ffffff;
        --bg-tertiary: #f3f4f6;
        --bg-card: #ffffff;
        
        --text-primary: #1a1a1a;
        --text-secondary: #666666;
        --text-tertiary: #999999;
        
        --border-color: #e5e7eb;
        --border-subtle: #f3f4f6;
    }

    .navbar {
        background-color: rgba(255, 255, 255, 0.8);
    }

    .feature-card {
        background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(243, 244, 246, 0.9) 100%);
    }

    .upload-area {
        background-color: #f9fafb;
    }

    .upload-area:hover,
    .upload-area.drag-over {
        background-color: rgba(59, 130, 246, 0.05);
    }

    .form-group input {
        background-color: #f3f4f6;
    }
}

/* ======================== Scrollbar ======================== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

.navbar-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    cursor: pointer;
}

.navbar-title:hover {
    color: var(--text-primary);
}

.navbar-links, .navbar-right {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.notification-bell {
    position: relative;
}

.btn-icon {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

.notification-count {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--error-color);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: bold;
}

.notification-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    min-width: 300px;
    max-height: 400px;
    overflow-y: auto;
    z-index: 200;
}

.notification-item {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
}

.notification-item:hover {
    background-color: var(--bg-color);
}

.notification-item.unread {
    background-color: #f0f4ff;
}

.notification-from {
    font-weight: 600;
    color: var(--primary-color);
}

.notification-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.username {
    font-weight: 500;
    color: var(--text-secondary);
}

.user-menu {
    position: relative;
}

.user-menu-toggle {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 0.9rem;
    border-radius: 999px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    text-transform: uppercase;
}

.user-menu-toggle:hover {
    background-color: rgba(255,255,255,0.1);
}

.user-menu-dropdown {
    position: absolute;
    right: 0;
    top: calc(100% + 0.5rem);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: 0 18px 40px rgba(0,0,0,0.25);
    min-width: 180px;
    padding: 0.5rem 0;
    display: none;
    z-index: 200;
}

.user-menu-dropdown.visible {
    display: block;
}

.user-menu-dropdown a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
}

.user-menu-dropdown a:hover {
    background-color: rgba(59,130,246,0.08);
}

.btn-admin {
    background: var(--accent-secondary);
    color: white;
}

.btn-admin:hover {
    filter: brightness(1.05);
}

.custom-file-input {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
}

.custom-file-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    min-width: 160px;
}

.custom-file-input input[type="file"] {
    display: none;
}

#profileImageLabel {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.checkbox-group label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background-color: #4f46e5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary:hover {
    background-color: #475569;
}

.btn-large {
    padding: 0.75rem 2rem;
    font-size: 1rem;
}

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

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

.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: 0.375rem;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Messages */
.message {
    padding: 1rem;
    border-radius: 0.375rem;
    margin-bottom: 1rem;
}

.message.success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
}

.message.error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.message.warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fcd34d;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #8b5cf6 100%);
    color: white;
    padding: 4rem 2rem;
    text-align: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero .btn {
    border: 2px solid white;
}

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

.hero .btn-secondary {
    background-color: transparent;
    color: white;
}

.hero .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Features */
.features {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 1rem;
}

.features h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
}

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

.feature {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.feature h4 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

/* Auth Container */
.auth-container {
    max-width: 400px;
    margin: 4rem auto;
    padding: 0 1rem;
}

.auth-form {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.auth-form h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.auth-link {
    text-align: center;
    margin-top: 1rem;
    color: var(--text-secondary);
}

.auth-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.auth-link a:hover {
    text-decoration: underline;
}

/* Dashboard */
.dashboard-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.upload-section {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.upload-section h2 {
    margin-bottom: 1.5rem;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 0.5rem;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background-color: var(--bg-color);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: #f0f4ff;
}

.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: #f0f4ff;
}

.upload-icon {
    width: 3rem;
    height: 3rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 1rem;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    transition: width 0.3s;
}

/* ======================== Tabs ======================== */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.tab-button {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
}

.tab-button.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

    .tab-content h3 {
        margin-bottom: 1rem;
        color: var(--text-primary);
    }

    /* ======================== Files List ======================== */
    .files-list {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        gap: 1.5rem;
    }

    .empty-state {
        grid-column: 1 / -1;
        text-align: center;
        color: var(--text-secondary);
        padding: 2rem;
    }

    .file-card {
        background: linear-gradient(135deg, rgba(39, 39, 42, 0.8) 0%, rgba(39, 39, 42, 0.5) 100%);
        border: 1px solid var(--border-color);
        padding: 1.5rem;
        border-radius: 1rem;
        transition: all 0.3s;
        backdrop-filter: blur(10px);
    }

    .file-card:hover {
        transform: translateY(-5px);
        border-color: var(--accent-primary);
        box-shadow: 0 15px 40px rgba(59, 130, 246, 0.2);
    }

    .file-header {
        display: flex;
        align-items: flex-start;
        margin-bottom: 1rem;
    }

    .file-icon {
        font-size: 1.5rem;
        margin-right: 0.75rem;
    }

    .file-info {
        flex: 1;
    }

    .file-name {
        font-weight: 600;
        color: var(--text-primary);
        word-break: break-word;
        margin-bottom: 0.5rem;
    }

    .file-details {
        font-size: 0.85rem;
        color: var(--text-secondary);
        display: flex;
        flex-direction: column;
        gap: 0.25rem;
    }

    .file-actions {
        display: flex;
        gap: 0.5rem;
        flex-wrap: wrap;
        margin-top: 1rem;
    }

    .file-actions .btn {
        flex: 1;
        min-width: 100px;
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
        text-align: center;
    }

    /* ======================== Modal ======================== */
    .modal {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.7);
        backdrop-filter: blur(5px);
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 300;
    }

    .modal-content {
        background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
        padding: 2rem;
        border-radius: 1.25rem;
        border: 1px solid var(--border-color);
        max-width: 500px;
        width: 90%;
        position: relative;
        box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
    }

    .modal-close {
        position: absolute;
        top: 1.5rem;
        right: 1.5rem;
        background: transparent;
        border: none;
        font-size: 1.5rem;
        cursor: pointer;
        color: var(--text-secondary);
        transition: color 0.3s;
    }

    .modal-close:hover {
        color: var(--text-primary);
    }

    .modal h3 {
        margin-bottom: 1.5rem;
        color: var(--text-primary);
        font-size: 1.5rem;
    }

    .share-options {
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
    }

    .share-option {
        padding: 1rem;
        border: 1px solid var(--border-color);
        border-radius: 0.75rem;
        background-color: var(--bg-tertiary);
    }

    .share-option h4 {
        margin-bottom: 0.75rem;
        color: var(--text-primary);
        font-weight: 600;
    }

    .share-option input {
        width: 100%;
        padding: 0.75rem;
        background-color: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: 0.5rem;
        color: var(--text-primary);
        margin-bottom: 0.75rem;
        transition: all 0.3s;
    }

    .share-option input:focus {
        outline: none;
        border-color: var(--accent-primary);
        box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    }

    .share-option .btn {
        width: 100%;
    }

    /* ======================== Notifications ======================== */
    .notification-bell {
        position: relative;
    }

    .btn-icon {
        background: none;
        border: none;
        font-size: 1.25rem;
        cursor: pointer;
        padding: 0.5rem;
        transition: transform 0.3s;
    }

    .btn-icon:hover {
        transform: scale(1.1);
    }

    .notification-count {
        position: absolute;
        top: -5px;
        right: -5px;
        background: linear-gradient(135deg, #ef4444, #dc2626);
        color: white;
        border-radius: 50%;
        width: 24px;
        height: 24px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.75rem;
        font-weight: bold;
        box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
    }

    .notification-dropdown {
        position: absolute;
        top: 100%;
        right: 0;
        background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
        border: 1px solid var(--border-color);
        border-radius: 1rem;
        box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
        min-width: 320px;
        max-height: 400px;
        overflow-y: auto;
        z-index: 200;
        margin-top: 0.5rem;
    }

    .notification-item {
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
        cursor: pointer;
        transition: all 0.2s;
    }

    .notification-item:last-child {
        border-bottom: none;
    }

    .notification-item:hover {
        background-color: rgba(59, 130, 246, 0.05);
    }

    .notification-item.unread {
        background-color: rgba(59, 130, 246, 0.1);
    }

    .notification-from {
        font-weight: 600;
        color: var(--accent-primary);
    }

    .notification-message {
        font-size: 0.9rem;
        color: var(--text-secondary);
        margin-top: 0.25rem;
    }

    .username {
        font-weight: 500;
        color: var(--text-secondary);
        margin: 0 1rem;
    }

    .navbar-right {
        display: flex;
        gap: 1rem;
        align-items: center;
    }

    /* ======================== Auth Link ======================== */
    .auth-link {
        text-align: center;
        margin-top: 1rem;
        color: var(--text-secondary);
    }

    .auth-link a {
        color: var(--accent-primary);
        text-decoration: none;
        font-weight: 600;
        transition: opacity 0.3s;
    }

    .auth-link a:hover {
        opacity: 0.8;
        text-decoration: underline;
    }

    /* ======================== Shared Files ======================== */
    .shared-file-badge {
        display: inline-block;
        padding: 0.25rem 0.75rem;
        background: linear-gradient(135deg, rgba(139, 92, 246, 0.4), rgba(139, 92, 246, 0.2));
        border-radius: 0.5rem;
        color: #e9d5ff;
        font-size: 0.75rem;
        font-weight: 600;
        margin-bottom: 0.5rem;
    }

    .upload-icon {
    width: 3rem;
    height: 3rem;
        color: var(--accent-primary);
    margin-bottom: 1rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 1rem;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.tab-button {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
}

.tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-content h3 {
    margin-bottom: 1rem;
}

/* Files List */
.files-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
}

.file-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.file-card:hover {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}

.file-header {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.file-icon {
    font-size: 1.5rem;
    margin-right: 0.75rem;
}

.file-info {
    flex: 1;
}

.file-name {
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-word;
}

.file-details {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.file-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.file-actions .btn {
    flex: 1;
    min-width: 120px;
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    text-align: center;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 300;
}

.modal-content {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 0.5rem;
    max-width: 500px;
    width: 90%;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal h3 {
    margin-bottom: 1.5rem;
}

.share-options {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.share-option {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    background-color: var(--bg-color);
}

.share-option h4 {
    margin-bottom: 0.75rem;
}

.share-option input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    margin-bottom: 0.75rem;
}

.share-option .btn {
    width: 100%;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-container {
        flex-direction: column;
        gap: 1rem;
    }

    .hero-content h2 {
        font-size: 1.75rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .upload-area {
        padding: 2rem 1rem;
    }

    .files-list {
        grid-template-columns: 1fr;
    }

    .tabs {
        flex-wrap: wrap;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}