/**
 * IUS DIGITAL v4.0 - Complete Styles
 */

/* ==================== CSS Variables ==================== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #e0e7ff;
    --secondary: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;

    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.06);
    --shadow: 0 4px 12px rgba(0,0,0,.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,.12);

    --spacing-xs: .25rem;
    --spacing-sm: .5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    --radius-sm: .375rem;
    --radius-md: .5rem;
    --radius-lg: .75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    --transition: all .2s ease;
    --sidebar-width: 260px;
    --topbar-height: 64px;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border-color: #334155;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.2);
    --shadow: 0 4px 12px rgba(0,0,0,.3);
    --shadow-lg: 0 12px 40px rgba(0,0,0,.4);
    --primary-light: #312e81;
}

/* ==================== Reset ==================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
}
h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.3; margin-bottom: 0; }
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
p { margin-bottom: var(--spacing-md); }
a { color: var(--primary); text-decoration: none; }
img { max-width: 100%; }

/* ==================== Buttons ==================== */
.btn-primary, .btn-secondary, .btn-danger, .btn-success, .btn-icon {
    padding: .625rem 1.25rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: .875rem;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
    font-family: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-secondary { background: var(--bg-tertiary); color: var(--text-primary); border: 1px solid var(--border-color); }
.btn-secondary:hover { background: var(--border-color); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #059669; }
.btn-icon { padding: .5rem; background: transparent; color: var(--text-secondary); border-radius: var(--radius-md); }
.btn-icon:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.btn-sm { padding: .375rem .75rem; font-size: .8125rem; }

/* ==================== Forms ==================== */
.form-group { margin-bottom: var(--spacing-lg); }
.form-group label {
    display: block;
    margin-bottom: .375rem;
    font-weight: 500;
    font-size: .875rem;
    color: var(--text-primary);
}
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: .625rem .875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: .875rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
    font-family: inherit;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, .15);
}
.form-hint {
    display: block;
    margin-top: .25rem;
    font-size: .75rem;
    color: var(--text-tertiary);
}
.url-display {
    padding: .625rem .875rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: .75rem;
    color: var(--text-secondary);
    word-break: break-all;
    font-family: 'Consolas', 'Monaco', monospace;
    border: 1px solid var(--border-color);
}
.copy-input { display: flex; gap: .5rem; }
.copy-input input { flex: 1; }

/* ==================== Cards ==================== */
.card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}
.card:hover { box-shadow: var(--shadow); }
.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}
.card-header h3 {
    margin: 0;
    display: flex;
    align-items: center;
    gap: .5rem;
    font-size: 1rem;
}
.card-body { padding: var(--spacing-lg); }

/* ==================== Login Page ==================== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}
.login-container { position: relative; z-index: 10; width: 100%; max-width: 420px; padding: var(--spacing-lg); }
.login-card {
    background: rgba(255, 255, 255, .97);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, .3);
    animation: fadeInUp .6s ease;
}
[data-theme="dark"] .login-card { background: rgba(15, 23, 42, .97); }
.login-header { text-align: center; margin-bottom: var(--spacing-2xl); }
.logo-container {
    width: 72px; height: 72px; margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
    display: flex; align-items: center; justify-content: center;
    font-size: 2rem; color: #fff;
    animation: pulse 2s infinite;
}
.login-header h1 {
    margin-bottom: .25rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.75rem;
}
.version { color: var(--text-secondary); font-size: .8125rem; }
.login-form { margin-bottom: var(--spacing-lg); }
.form-options { margin-bottom: var(--spacing-lg); }
.checkbox-label {
    display: flex; align-items: center; gap: .5rem;
    cursor: pointer; user-select: none; font-size: .875rem;
}
.checkbox-label input[type="checkbox"] { width: auto; cursor: pointer; }
.login-footer {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: .8125rem;
}
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    animation: fadeIn .3s ease;
    font-size: .875rem;
}
.alert.error { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.alert.success { background: #d1fae5; color: #065f46; border: 1px solid #6ee7b7; }

/* ==================== Landing Page ==================== */
.landing-page {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, #667eea, #764ba2);
    position: relative; overflow: hidden;
}
.landing-container { position: relative; z-index: 10; text-align: center; }
.landing-content {
    background: rgba(255, 255, 255, .97);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 500px; margin: 0 auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, .3);
    animation: fadeInUp .6s ease;
}
[data-theme="dark"] .landing-content { background: rgba(15, 23, 42, .97); }
.logo-large {
    width: 100px; height: 100px; margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
    display: flex; align-items: center; justify-content: center;
    font-size: 3rem; color: #fff;
    animation: pulse 2s infinite;
}
.landing-title {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text; font-size: 2.5rem; margin-bottom: var(--spacing-sm);
}
.landing-subtitle { color: var(--text-secondary); font-size: 1rem; margin-bottom: var(--spacing-sm); }
.landing-version { color: var(--text-tertiary); font-size: .8125rem; margin-bottom: var(--spacing-xl); }
.landing-actions { display: flex; gap: var(--spacing-md); justify-content: center; }

/* ==================== Sidebar ==================== */
.sidebar {
    position: fixed; left: 0; top: 0; width: var(--sidebar-width); height: 100vh;
    background: var(--bg-primary); border-right: 1px solid var(--border-color);
    display: flex; flex-direction: column; transition: var(--transition); z-index: 1000;
}
.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex; align-items: center;
    min-height: var(--topbar-height);
}
.logo {
    display: flex; align-items: center; gap: .75rem;
    font-size: 1.125rem; font-weight: 700; color: var(--primary);
}
.logo i { font-size: 1.5rem; color: var(--primary); }

.sidebar-nav { flex: 1; overflow-y: auto; padding: var(--spacing-md) 0; }
.nav-item {
    display: flex; align-items: center; gap: .75rem;
    padding: .75rem var(--spacing-lg);
    color: var(--text-secondary); text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
    font-size: .875rem; margin: 2px 0;
}
.nav-item:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.nav-item.active {
    background: var(--primary-light); color: var(--primary);
    border-left-color: var(--primary); font-weight: 600;
}
.nav-item i { font-size: 1.125rem; width: 1.25rem; text-align: center; }

.sidebar-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex; flex-direction: column; gap: var(--spacing-sm);
}
.user-info { display: flex; align-items: center; gap: .75rem; min-width: 0; }
.avatar {
    width: 36px; height: 36px; border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex; align-items: center; justify-content: center;
    color: #fff; flex-shrink: 0; font-size: 1rem;
}
.user-details { flex: 1; min-width: 0; }
.user-name {
    display: block; font-weight: 600; font-size: .8125rem;
    color: var(--text-primary);
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.user-role {
    display: block; font-size: .6875rem; color: var(--text-tertiary);
    text-transform: uppercase; letter-spacing: .5px;
}
.sidebar-actions { display: flex; gap: .25rem; }

/* ==================== Main Content ==================== */
.main-content {
    margin-left: var(--sidebar-width); min-height: 100vh; transition: var(--transition);
}
.topbar {
    height: var(--topbar-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 var(--spacing-xl);
    display: flex; align-items: center; justify-content: space-between;
    position: sticky; top: 0; z-index: 100;
}
.topbar-left { display: flex; align-items: center; gap: var(--spacing-lg); }
.mobile-menu-toggle {
    display: none; background: none; border: none;
    font-size: 1.25rem; color: var(--text-primary); cursor: pointer; padding: .5rem;
}
.page-title { margin: 0; font-size: 1.25rem; font-weight: 600; }

.search-box { position: relative; display: flex; align-items: center; }
.search-box > i {
    position: absolute; left: .875rem; color: var(--text-tertiary); font-size: .875rem;
}
.search-box input {
    padding: .5rem 4rem .5rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    color: var(--text-primary);
    width: 280px; transition: var(--transition); font-size: .8125rem;
}
.search-box input:focus {
    outline: none; border-color: var(--primary);
    width: 360px; background: var(--bg-primary);
}
.search-box kbd {
    position: absolute; right: .75rem; font-size: .625rem;
    padding: .125rem .375rem; background: var(--bg-tertiary);
    border: 1px solid var(--border-color); border-radius: var(--radius-sm);
    color: var(--text-tertiary); font-family: inherit;
}

.content-wrapper { padding: var(--spacing-xl); }

/* ==================== Stats Grid ==================== */
.stats-grid {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md); margin-bottom: var(--spacing-xl);
}
.stat-card {
    background: var(--bg-primary); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); padding: var(--spacing-lg);
    display: flex; align-items: center; gap: var(--spacing-md);
    transition: var(--transition);
}
.stat-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.stat-icon {
    width: 48px; height: 48px; border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.25rem; flex-shrink: 0;
}
.stat-content p {
    margin: 0; color: var(--text-secondary); font-size: .75rem;
    text-transform: uppercase; letter-spacing: .3px;
}
.stat-content h3 { margin: 0; font-size: 1.5rem; font-weight: 700; line-height: 1.2; }

/* ==================== Dashboard Grid ==================== */
.dashboard-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-lg);
}

/* File list items */
.file-item {
    display: flex; align-items: center; gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md); transition: var(--transition); cursor: pointer;
}
.file-item:hover { background: var(--bg-tertiary); }
.file-item + .file-item { border-top: 1px solid var(--border-color); }
.file-icon {
    width: 36px; height: 36px; border-radius: var(--radius-md);
    background: var(--primary-light);
    display: flex; align-items: center; justify-content: center;
    color: var(--primary); font-size: 1rem; flex-shrink: 0;
}
.file-info { flex: 1; min-width: 0; }
.file-name {
    font-weight: 500; font-size: .8125rem; color: var(--text-primary);
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.file-meta {
    font-size: .6875rem; color: var(--text-tertiary);
    display: flex; gap: var(--spacing-md);
}

/* ==================== Files View ==================== */
.files-toolbar {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: var(--spacing-lg); gap: var(--spacing-md); flex-wrap: wrap;
}
.toolbar-left, .toolbar-right { display: flex; align-items: center; gap: var(--spacing-md); }
.files-count { font-size: .875rem; color: var(--text-secondary); font-weight: 500; }
.sort-select {
    padding: .5rem .75rem; border: 1px solid var(--border-color);
    border-radius: var(--radius-md); background: var(--bg-primary);
    color: var(--text-primary); font-size: .8125rem; cursor: pointer; font-family: inherit;
}
.view-switcher {
    display: flex; background: var(--bg-tertiary); border-radius: var(--radius-md);
    overflow: hidden; border: 1px solid var(--border-color);
}
.view-switcher .btn-icon { border-radius: 0; padding: .5rem .625rem; }
.view-switcher .btn-icon.active { background: var(--primary); color: #fff; }

/* File cards - Grid */
.files-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-md);
}
.file-card {
    background: var(--bg-primary); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); overflow: hidden;
    transition: var(--transition); position: relative;
}
.file-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }

/* Thumbnail */
.file-thumbnail {
    height: 180px; background: var(--bg-tertiary);
    display: flex; align-items: center; justify-content: center;
    overflow: hidden; position: relative; cursor: pointer;
}
.file-thumbnail canvas {
    width: 100%; height: 100%; object-fit: contain;
}
.file-thumbnail .thumb-placeholder {
    display: flex; flex-direction: column; align-items: center;
    justify-content: center; gap: .5rem; color: var(--text-tertiary);
}
.file-thumbnail .thumb-placeholder i { font-size: 2.5rem; color: var(--primary); }
.file-thumbnail .thumb-placeholder span {
    font-size: .6875rem; text-transform: uppercase; letter-spacing: .5px;
}
.file-thumbnail .thumb-overlay {
    position: absolute; inset: 0; background: rgba(0, 0, 0, .5);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; transition: var(--transition);
}
.file-thumbnail:hover .thumb-overlay { opacity: 1; }
.file-thumbnail .thumb-overlay i { font-size: 2rem; color: #fff; }

.file-card-body { padding: var(--spacing-md); }
.file-card-title {
    font-weight: 600; font-size: .8125rem; margin-bottom: .25rem;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.file-card-meta {
    font-size: .6875rem; color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
    display: flex; align-items: center; gap: .375rem; flex-wrap: wrap;
}
.file-card-actions {
    display: flex; gap: .25rem;
    padding-top: var(--spacing-sm); border-top: 1px solid var(--border-color);
}
.file-card-actions .btn-icon { flex: 1; padding: .375rem; font-size: .8125rem; }
.file-card-actions .btn-icon:hover { color: var(--primary); }
.file-card-actions .btn-icon.delete-btn:hover { color: var(--danger); }

/* File cards - List view */
.files-grid.list-view { display: flex; flex-direction: column; gap: .5rem; }
.files-grid.list-view .file-card { display: flex; flex-direction: row; align-items: center; }
.files-grid.list-view .file-thumbnail { width: 80px; height: 60px; flex-shrink: 0; }
.files-grid.list-view .file-card-body {
    flex: 1; display: flex; align-items: center; gap: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-md);
}
.files-grid.list-view .file-card-title { flex: 2; margin: 0; }
.files-grid.list-view .file-card-meta { flex: 2; margin: 0; }
.files-grid.list-view .file-card-actions { flex: 0; border: none; padding: 0; }

/* ==================== Upload View ==================== */
.upload-container { max-width: 700px; margin: 0 auto; }
.upload-dropzone {
    border: 2px dashed var(--border-color); border-radius: var(--radius-lg);
    padding: var(--spacing-2xl) var(--spacing-xl); text-align: center;
    transition: var(--transition); cursor: pointer; background: var(--bg-primary);
}
.upload-dropzone:hover,
.upload-dropzone.drag-over {
    border-color: var(--primary); background: var(--primary-light);
}
.dropzone-icon { font-size: 3rem; color: var(--primary); margin-bottom: var(--spacing-md); }
.upload-dropzone h3 { margin-bottom: .25rem; font-size: 1.125rem; }
.upload-dropzone p { color: var(--text-secondary); margin-bottom: var(--spacing-lg); font-size: .875rem; }

.upload-list { margin-top: var(--spacing-lg); }
.upload-item {
    background: var(--bg-primary); border: 1px solid var(--border-color);
    border-radius: var(--radius-md); padding: var(--spacing-md); margin-bottom: var(--spacing-sm);
}
.upload-item-header { display: flex; align-items: center; gap: var(--spacing-md); margin-bottom: var(--spacing-sm); }
.upload-item-icon { font-size: 1.25rem; color: var(--primary); }
.upload-item-info { flex: 1; }
.upload-item-name { font-weight: 500; font-size: .8125rem; margin-bottom: .125rem; }
.upload-item-size { font-size: .75rem; color: var(--text-secondary); }
.upload-progress {
    height: 6px; background: var(--bg-tertiary); border-radius: var(--radius-full);
    overflow: hidden; margin-bottom: .375rem;
}
.upload-progress-bar {
    height: 100%; background: var(--primary);
    transition: width .3s ease; border-radius: var(--radius-full);
}
.upload-status { font-size: .75rem; color: var(--text-secondary); }

/* ==================== Users View ==================== */
.users-toolbar {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: var(--spacing-lg);
}
.users-toolbar h2 { display: flex; align-items: center; gap: .5rem; font-size: 1.25rem; }
.users-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}
.user-card {
    background: var(--bg-primary); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); padding: var(--spacing-lg);
    transition: var(--transition);
}
.user-card:hover { box-shadow: var(--shadow); }
.user-card-header { display: flex; align-items: center; gap: var(--spacing-md); margin-bottom: var(--spacing-md); }
.user-card-avatar {
    width: 48px; height: 48px; border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 1.25rem; flex-shrink: 0;
}
.user-card-info { flex: 1; min-width: 0; }
.user-card-name { font-weight: 600; font-size: .9375rem; }
.user-card-email {
    font-size: .75rem; color: var(--text-secondary);
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.user-card-details { display: flex; gap: var(--spacing-sm); margin-bottom: var(--spacing-md); flex-wrap: wrap; }
.user-badge {
    padding: .25rem .625rem; border-radius: var(--radius-full);
    font-size: .6875rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: .3px;
}
.user-badge.admin { background: var(--primary-light); color: var(--primary); }
.user-badge.user { background: var(--bg-tertiary); color: var(--text-secondary); }
.user-badge.active { background: #dcfce7; color: #16a34a; }
.user-badge.inactive { background: #fee2e2; color: #dc2626; }
.user-card-meta { font-size: .6875rem; color: var(--text-tertiary); margin-bottom: var(--spacing-md); }
.user-card-actions {
    display: flex; gap: .5rem;
    padding-top: var(--spacing-sm); border-top: 1px solid var(--border-color);
}

/* ==================== Modals ==================== */
.modal-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(0, 0, 0, .5); backdrop-filter: blur(4px);
    z-index: 2000; align-items: center; justify-content: center;
    padding: var(--spacing-lg);
}
.modal-overlay.active { display: flex; animation: fadeIn .2s ease; }
.modal {
    background: var(--bg-primary); border-radius: var(--radius-lg);
    max-width: 540px; width: 100%; max-height: 90vh; overflow-y: auto;
    box-shadow: var(--shadow-lg); animation: scaleIn .2s ease;
}
.modal.modal-sm { max-width: 440px; }
.modal-header {
    padding: var(--spacing-lg); border-bottom: 1px solid var(--border-color);
    display: flex; align-items: center; justify-content: space-between;
}
.modal-header h3 { margin: 0; display: flex; align-items: center; gap: .5rem; font-size: 1.0625rem; }
.modal-body { padding: var(--spacing-lg); }
.modal-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex; gap: var(--spacing-sm); justify-content: flex-end;
}

/* ==================== Toast ==================== */
.toast-container {
    position: fixed; bottom: var(--spacing-xl); right: var(--spacing-xl);
    z-index: 3000; display: flex; flex-direction: column-reverse; gap: var(--spacing-sm);
}
.toast {
    padding: var(--spacing-md) var(--spacing-lg); border-radius: var(--radius-md);
    color: #fff; font-size: .875rem; display: flex; align-items: center; gap: var(--spacing-sm);
    box-shadow: var(--shadow-lg); animation: slideInRight .3s ease;
    min-width: 280px; max-width: 420px;
}
.toast.success { background: #059669; }
.toast.error { background: #dc2626; }
.toast.info { background: var(--primary); }
.toast.warning { background: #d97706; }
.toast i { font-size: 1.125rem; flex-shrink: 0; }
.toast span { flex: 1; }

/* ==================== Loading ==================== */
.loading-overlay {
    position: fixed; inset: 0; background: rgba(15, 23, 42, .7);
    backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center; z-index: 3000;
}
.spinner {
    width: 48px; height: 48px;
    border: 3px solid rgba(255, 255, 255, .2);
    border-top-color: #fff; border-radius: 50%;
    animation: spin .8s linear infinite;
}

/* ==================== Empty State ==================== */
.empty-state {
    text-align: center; padding: var(--spacing-2xl); color: var(--text-tertiary);
}
.empty-state i { font-size: 3rem; margin-bottom: var(--spacing-md); display: block; }
.empty-state p { font-size: .9375rem; }

/* ==================== Animations ==================== */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes scaleIn { from { opacity: 0; transform: scale(.95); } to { opacity: 1; transform: scale(1); } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.05); } }
@keyframes slideInRight { from { opacity: 0; transform: translateX(100%); } to { opacity: 1; transform: translateX(0); } }

/* Particles */
#particlesCanvas {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none;
}

/* ==================== Responsive ==================== */
@media (max-width: 1400px) {
    .stats-grid { grid-template-columns: repeat(4, 1fr); }
    .files-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
}
@media (max-width: 1200px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .dashboard-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.active { transform: translateX(0); box-shadow: var(--shadow-lg); }
    .main-content { margin-left: 0; }
    .mobile-menu-toggle { display: block; }
    .search-box input { width: 220px; }
    .search-box input:focus { width: 280px; }
}
@media (max-width: 768px) {
    .search-box kbd { display: none; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .dashboard-grid { grid-template-columns: 1fr; }
    .files-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
    .files-grid.list-view .file-card-body { flex-direction: column; align-items: flex-start; gap: .25rem; }
    .users-grid { grid-template-columns: 1fr; }
    .topbar { padding: 0 var(--spacing-md); }
    .content-wrapper { padding: var(--spacing-md); }
    .modal { margin: var(--spacing-sm); max-height: 95vh; }
    .file-thumbnail { height: 150px; }
    .user-card-actions { flex-wrap: wrap; }
    .files-toolbar { flex-direction: column; align-items: stretch; }
    .toolbar-left, .toolbar-right { justify-content: space-between; }
}
@media (max-width: 480px) {
    .page-title { font-size: 1rem; }
    .search-box { display: none; }
    .stats-grid { grid-template-columns: 1fr; }
    .files-grid { grid-template-columns: 1fr; }
    .file-thumbnail { height: 200px; }
    .stat-card { padding: var(--spacing-md); }
    .stat-icon { width: 40px; height: 40px; font-size: 1rem; }
    .stat-content h3 { font-size: 1.25rem; }
    .topbar-left { gap: var(--spacing-sm); }
    .modal { margin: var(--spacing-xs); }
    .modal-header, .modal-body, .modal-footer { padding: var(--spacing-md); }
}

/* ==================== Utilities ==================== */
.text-center { text-align: center; }
.hidden { display: none !important; }
.load-more-container { text-align: center; margin-top: var(--spacing-xl); }