/* ========================================
   FileShare - Modern 2025/26 Design System
   ======================================== */

/* CSS Variables - Design Tokens */
:root {
    /* Colors - Premium Gradient Palette */
    --primary-hue: 230;
    --primary: hsl(var(--primary-hue), 85%, 60%);
    --primary-light: hsl(var(--primary-hue), 90%, 70%);
    --primary-dark: hsl(var(--primary-hue), 80%, 45%);
    --primary-glow: hsla(var(--primary-hue), 100%, 65%, 0.4);

    --accent: hsl(280, 80%, 60%);
    --success: hsl(160, 70%, 45%);
    --warning: hsl(40, 95%, 55%);
    --danger: hsl(0, 75%, 60%);

    /* Neutrals - Cool Gray */
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.8);
    --bg-elevated: rgba(30, 41, 59, 0.6);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border-color: rgba(148, 163, 184, 0.15);
    --border-glow: rgba(99, 102, 241, 0.3);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--primary-glow);

    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;

    /* Subtle grid background */
    background-image:
        radial-gradient(ellipse 80% 50% at 50% -20%, hsla(var(--primary-hue), 70%, 50%, 0.15), transparent),
        linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

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

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: var(--transition-fast);
}

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

/* ========================================
   Navigation Bar
   ======================================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background: rgba(10, 14, 23, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.navbar-brand i {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.navbar-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-fast);
}

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

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow);
}

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

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

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

.btn-danger:hover {
    background: hsl(0, 80%, 55%);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

/* ========================================
   Form Controls
   ======================================== */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

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

.form-control:disabled {
    background: var(--bg-elevated);
    color: var(--text-muted);
    cursor: not-allowed;
}

/* ========================================
   Cards
   ======================================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    backdrop-filter: blur(10px);
    transition: var(--transition-base);
}

.card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-md);
}

/* ========================================
   Alerts
   ======================================== */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    font-weight: 500;
}

.alert-error {
    background: hsla(0, 70%, 50%, 0.15);
    color: hsl(0, 80%, 70%);
    border: 1px solid hsla(0, 70%, 50%, 0.3);
}

.alert-success {
    background: hsla(160, 70%, 40%, 0.15);
    color: hsl(160, 70%, 65%);
    border: 1px solid hsla(160, 70%, 40%, 0.3);
}

/* ========================================
   Dashboard Layout
   ======================================== */
.dashboard-container {
    display: flex;
    min-height: calc(100vh - 65px);
}

/* Sidebar */
.sidebar {
    width: 72px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: var(--space-lg) var(--space-sm);
    display: flex;
    flex-direction: column;
    transition: width var(--transition-slow);
    overflow: hidden;
    position: relative;
    z-index: 50;
}

.sidebar:hover {
    width: 260px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    padding: var(--space-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    transition: var(--transition-fast);
    white-space: nowrap;
    height: 48px;
}

.sidebar-link:hover,
.sidebar-link.active {
    background: var(--bg-elevated);
    color: var(--primary-light);
}

.sidebar-link i {
    width: 24px;
    height: 24px;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sidebar-link span {
    margin-left: var(--space-md);
    opacity: 0;
    transform: translateX(-8px);
    transition: var(--transition-fast);
}

.sidebar:hover .sidebar-link span {
    opacity: 1;
    transform: translateX(0);
}

.sidebar-footer {
    margin-top: auto;
    padding: var(--space-md);
    opacity: 0;
    transition: var(--transition-fast);
}

.sidebar:hover .sidebar-footer {
    opacity: 1;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--space-2xl);
    overflow-y: auto;
    background: var(--bg-primary);
}

/* ========================================
   Pricing Section (Landing)
   ======================================== */
.pricing-section {
    padding: var(--space-2xl) var(--space-xl);
    text-align: center;
    max-width: 1200px;
    margin: 0 auto;
}

.pricing-section h1 {
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    text-align: left;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.pricing-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: var(--transition-fast);
}

.pricing-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-glow);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

.pricing-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--space-lg);
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pricing-price span {
    font-size: 1rem;
    font-weight: 500;
    -webkit-text-fill-color: var(--text-muted);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--space-xl);
}

.pricing-features li {
    padding: var(--space-sm) 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.pricing-features i {
    color: var(--success);
}

/* ========================================
   File Manager
   ======================================== */
.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.file-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: var(--transition-fast);
}

.file-card:hover {
    border-color: var(--primary);
    box-shadow: 0 0 20px var(--primary-glow);
}

.file-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-bottom: var(--space-md);
}

.file-name {
    font-weight: 600;
    margin-bottom: var(--space-xs);
    word-break: break-all;
}

.file-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.file-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

/* ========================================
   Upload Area
   ======================================== */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    text-align: center;
    transition: var(--transition-fast);
    cursor: pointer;
    background: var(--bg-card);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.upload-zone i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.upload-progress {
    margin-top: var(--space-lg);
    display: none;
}

.progress-bar {
    height: 8px;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

/* ========================================
   Tables
   ======================================== */
table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

th,
td {
    padding: var(--space-md) var(--space-lg);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: var(--bg-elevated);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tr:hover {
    background: rgba(99, 102, 241, 0.05);
}

/* ========================================
   Avatar Section
   ======================================== */
.avatar-section {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.avatar-preview {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--bg-elevated), var(--bg-secondary));
    border: 3px solid var(--border-color);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-preview i {
    font-size: 2.5rem;
    color: var(--text-muted);
}

/* ========================================
   Stats Cards
   ======================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
}

.stat-card h3 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-sm);
}

.stat-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ========================================
   Auth Pages
   ======================================== */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-lg);
}

.auth-card h2 {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.auth-footer {
    text-align: center;
    margin-top: var(--space-xl);
    color: var(--text-muted);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    .navbar {
        padding: var(--space-md);
    }

    .sidebar {
        width: 100%;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        flex-direction: row;
        height: 64px;
        padding: 0;
        justify-content: space-around;
        border-right: none;
        border-top: 1px solid var(--border-color);
    }

    .sidebar:hover {
        width: 100%;
    }

    .sidebar-link {
        flex-direction: column;
        padding: var(--space-sm);
        height: auto;
        margin-bottom: 0;
    }

    .sidebar-link span {
        display: none;
    }

    .sidebar-footer {
        display: none;
    }

    .main-content {
        padding: var(--space-lg);
        padding-bottom: 80px;
    }

    .dashboard-container {
        flex-direction: column;
    }
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

.fade-in {
    animation: fadeInUp 0.5s ease forwards;
}

/* Code blocks */
pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

code {
    font-family: var(--font-mono);
    background: var(--bg-elevated);
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}