/* assets/css/style.css */

/* Định nghĩa hệ thống màu sắc sáng/tối */
:root {
    --bg-color: #0b0f19;
    --card-bg: rgba(20, 27, 45, 0.7);
    --card-hover: rgba(28, 38, 62, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-color: #f3f4f6;
    --text-muted: #9ca3af;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --accent: #8b5cf6;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --glass-blur: blur(16px);
}

[data-theme="light"] {
    --bg-color: #f3f4f6;
    --card-bg: rgba(255, 255, 255, 0.8);
    --card-hover: rgba(255, 255, 255, 0.95);
    --border-color: rgba(0, 0, 0, 0.08);
    --text-color: #1f2937;
    --text-muted: #4b5563;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #059669;
    --danger: #dc2626;
    --warning: #d97706;
    --accent: #7c3aed;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    --glass-blur: blur(12px);
}

/* Reset CSS */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
    transition: background-color 0.4s, color 0.4s;
}

/* Background elements */
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 600px;
    background-image: radial-gradient(circle at 10% 10%, rgba(59, 130, 246, 0.06) 0%, transparent 40%),
                      radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 40%);
    pointer-events: none;
    z-index: -1;
}

/* Header & Navigation */
header {
    background: rgba(11, 15, 25, 0.3);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

[data-theme="light"] header {
    background: rgba(243, 244, 246, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-text {
    font-size: 1.6rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    letter-spacing: -0.5px;
    display: inline-block;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Theme switch button */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .theme-toggle:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* Main Container */
main {
    flex: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
}

/* Welcome Section */
.welcome-box {
    margin-bottom: 40px;
    text-align: center;
}

.welcome-box h2 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.welcome-box p {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Search and Filter Container */
.search-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 20px;
    margin-bottom: 40px;
    box-shadow: var(--shadow);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
}

.search-wrapper {
    position: relative;
    width: 100%;
}

.search-input {
    width: 100%;
    padding: 15px 20px 15px 50px;
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    color: var(--text-color);
    font-size: 1.05rem;
    outline: none;
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.search-icon {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

/* Subjects Grid */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

/* Subject Card */
.subject-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 25px;
    box-shadow: var(--shadow);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
}

.subject-card:hover {
    transform: translateY(-5px);
    background: var(--card-hover);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.subject-header {
    margin-bottom: 15px;
}

.subject-code {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 6px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.subject-title {
    font-size: 1.35rem;
    font-weight: 600;
    line-height: 1.3;
}

.subject-info {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.info-item:last-child {
    margin-bottom: 0;
}

.info-icon {
    font-size: 0.95rem;
    color: var(--primary);
}

.subject-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

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

/* Button & Links */
.btn {
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    outline: none;
}

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

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

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

.btn-secondary:hover {
    background: rgba(255,255,255,0.05);
}

[data-theme="light"] .btn-secondary:hover {
    background: rgba(0,0,0,0.05);
}

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

.btn-danger:hover {
    background: #c53030;
}

/* Modal detail môn học & tài liệu */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
    backdrop-filter: blur(8px);
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    width: 100%;
    max-width: 750px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.4rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body {
    padding: 25px;
    overflow-y: auto;
    flex: 1;
}

/* Document List inside Modal */
.doc-list {
    margin-top: 15px;
}

.doc-item {
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 15px;
    margin-bottom: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.doc-item:last-child {
    margin-bottom: 0;
}

.doc-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.doc-icon {
    font-size: 2rem;
    color: var(--primary);
}

.doc-name {
    font-weight: 500;
    font-size: 0.95rem;
    word-break: break-all;
}

.doc-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    gap: 12px;
    margin-top: 4px;
}

/* Form password bảo vệ website */
.pwd-protect-container {
    max-width: 480px;
    margin: 100px auto;
    background: linear-gradient(135deg, var(--card-bg), rgba(15, 23, 42, 0.45));
    border: 1.5px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
    text-align: center;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

[data-theme="light"] .pwd-protect-container {
    background: linear-gradient(135deg, var(--card-bg), rgba(255, 255, 255, 0.95));
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
}

.pwd-protect-container:hover {
    transform: translateY(-4px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.45);
}

[data-theme="light"] .pwd-protect-container:hover {
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.08);
}

/* Định dạng biểu mẫu form-group và form-control */
.form-group {
    margin-bottom: 22px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
    letter-spacing: -0.2px;
    transition: color 0.2s ease;
}

.form-group:focus-within label {
    color: var(--primary);
}

.form-control {
    width: 100%;
    padding: 12px 18px;
    background-color: rgba(0, 0, 0, 0.25);
    border: 1.5px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-color);
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .form-control {
    background-color: rgba(255, 255, 255, 0.85);
    border-color: rgba(0, 0, 0, 0.12);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

.form-control:hover {
    border-color: rgba(59, 130, 246, 0.4);
}

[data-theme="light"] .form-control:hover {
    border-color: rgba(37, 99, 235, 0.4);
}

.form-control:focus {
    border-color: var(--primary);
    background-color: rgba(0, 0, 0, 0.35);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25), 0 4px 12px rgba(59, 130, 246, 0.1);
}

[data-theme="light"] .form-control:focus {
    background-color: #ffffff;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2), 0 4px 12px rgba(37, 99, 235, 0.05);
}

/* Các trường Select và Textarea đặc thù */
select.form-control {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%239ca3af'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E") !important;
    background-repeat: no-repeat !important;
    background-position: right 16px center !important;
    background-size: 16px !important;
    padding-right: 40px;
}

[data-theme="light"] select.form-control {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%234b5563'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E") !important;
}

/* Fix mobile select re-rendering immediate collapse on focus */
select.form-control:focus {
    background-color: rgba(0, 0, 0, 0.25) !important;
    box-shadow: none !important;
}
[data-theme="light"] select.form-control:focus {
    background-color: rgba(255, 255, 255, 0.85) !important;
    box-shadow: none !important;
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
    line-height: 1.5;
}

/* Hiệu ứng chuyển động cho nút và liên kết */
.btn {
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(59, 130, 246, 0.25);
}

.btn:active {
    transform: translateY(0);
}

.back-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.back-link span {
    transition: transform 0.2s ease;
    display: inline-block;
}

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

.back-link:hover span {
    transform: translateX(-4px);
}

.captcha-group {
    background: rgba(0, 0, 0, 0.18);
    padding: 16px;
    border-radius: 14px;
    border: 1.5px solid var(--border-color);
    margin-bottom: 22px;
}

[data-theme="light"] .captcha-group {
    background: rgba(0, 0, 0, 0.02);
    border-color: rgba(0, 0, 0, 0.08);
}

.captcha-group label strong {
    color: var(--primary);
    font-size: 1.15rem;
    margin-left: 6px;
}

/* Trình chứa input có icon */
.input-with-icon {
    position: relative;
    width: 100%;
}

.input-with-icon .input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.1rem;
    color: var(--text-muted);
    pointer-events: none;
    transition: color 0.25s ease;
}

.input-with-icon .form-control {
    padding-left: 46px;
}

.input-with-icon:focus-within .input-icon {
    color: var(--primary);
}

/* Premium background glow orbs for login page */
.login-bg-glow {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -2;
    overflow: hidden;
    pointer-events: none;
    background: radial-gradient(circle at 50% 50%, #0d1527 0%, #070a13 100%);
}

[data-theme="light"] .login-bg-glow {
    background: radial-gradient(circle at 50% 50%, #f0f4f8 0%, #e2e8f0 100%);
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    mix-blend-mode: screen;
    animation: floatOrb 8s infinite alternate ease-in-out;
}

[data-theme="light"] .glow-orb {
    opacity: 0.35;
    mix-blend-mode: multiply;
}

.orb-1 {
    top: -10%;
    left: 10%;
    width: 400px;
    height: 400px;
    background: var(--primary);
}

.orb-2 {
    bottom: -10%;
    right: 10%;
    width: 500px;
    height: 500px;
    background: var(--accent);
    animation-delay: -3s;
}

@keyframes floatOrb {
    0% { transform: translateY(0) scale(1); }
    100% { transform: translateY(30px) scale(1.1); }
}

/* Custom error message */
.alert-danger-custom {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(239, 68, 68, 0.1);
    border: 1.5px solid rgba(239, 68, 68, 0.25);
    color: #fca5a5;
    padding: 14px 18px;
    border-radius: 12px;
    margin-bottom: 22px;
    font-size: 0.9rem;
    text-align: left;
    animation: shake 0.5s ease-in-out;
}

[data-theme="light"] .alert-danger-custom {
    background: rgba(220, 38, 38, 0.06);
    border-color: rgba(220, 38, 38, 0.15);
    color: #b91c1c;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-6px); }
    40%, 80% { transform: translateX(6px); }
}



/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: 25px 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: auto;
}

.footer-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.25s ease;
}

.footer-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* CSS Admin layout */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 260px;
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.admin-logo {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary);
    text-align: center;
}

.admin-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.admin-menu a {
    color: var(--text-color);
    text-decoration: none;
    padding: 12px 15px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
}

.admin-menu a.active, .admin-menu a:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
}

.admin-main {
    flex: 1;
    padding: 40px;
    overflow-y: auto;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

/* Thống kê Dashboard */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 35px;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-number {
    font-size: 1.6rem;
    font-weight: 700;
}

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

/* Bảng biểu */
.table-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow-x: auto;
    margin-bottom: 30px;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th, td {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
}

tr:last-child td {
    border-bottom: none;
}

.badge {
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-primary { background: rgba(59, 130, 246, 0.15); color: var(--primary); }
.badge-success { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.badge-danger { background: rgba(239, 68, 68, 0.15); color: var(--danger); }

/* Form Settings & Cấu hình */
.settings-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px;
    margin-bottom: 25px;
}

.settings-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* Document Share Link styles */
.doc-actions-wrapper {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
}

.doc-share-link {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    padding: 6px 10px;
    border-radius: 10px;
    width: 280px;
    box-sizing: border-box;
}

[data-theme="light"] .doc-share-link {
    background: rgba(255, 255, 255, 0.6);
}

.share-url-input {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.75rem;
    flex: 1;
    min-width: 0;
    outline: none;
    text-overflow: ellipsis;
    padding: 0;
}

.doc-share-link .btn-copy-link {
    background: var(--primary);
    color: white;
    border: none;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.doc-share-link .btn-copy-link:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.doc-share-link .btn-copy-link.copied {
    background: var(--success) !important;
}

/* Admin Two Column Grid */
.admin-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
}

.admin-grid.docs-grid {
    grid-template-columns: 2.2fr 1fr;
}

/* Sidebar Toggle & Overlay styles */
.sidebar-toggle-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.sidebar-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .sidebar-toggle-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

.sidebar-close-btn {
    display: none;
    position: absolute;
    top: 15px;
    right: 15px;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
    z-index: 10;
}

.sidebar-close-btn:hover {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .sidebar-close-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Responsive */
@media (max-width: 1024px) {
    .admin-grid, .admin-grid.docs-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

@media (max-width: 900px) {
    .sidebar-toggle-btn {
        display: inline-flex !important;
    }
    
    .sidebar-close-btn {
        display: flex !important;
        align-items: center;
        justify-content: center;
    }
    
    .admin-layout {
        flex-direction: column;
    }
    
    .admin-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 280px;
        z-index: 1001;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        border-right: 1px solid var(--border-color);
        border-bottom: none;
        box-shadow: 10px 0 30px rgba(0, 0, 0, 0.25);
        background-color: var(--bg-color);
        padding: 30px 20px;
    }
    
    .admin-sidebar.open {
        transform: translateX(0);
    }
    
    .admin-main {
        padding: 20px;
    }
}

@media (max-width: 650px) {
    .logo-text {
        font-size: 1.25rem !important;
        max-width: 180px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        display: inline-block;
    }
    .nav-container {
        padding: 10px 15px;
        gap: 8px;
    }
    .nav-actions {
        gap: 10px;
    }
    .theme-toggle {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }
    .admin-header h2 {
        font-size: 1.3rem;
    }
    .admin-header p {
        font-size: 0.8rem;
    }
    .admin-header {
        margin-bottom: 20px;
        gap: 10px;
    }
    .admin-header > div:first-child {
        gap: 10px !important;
    }
    .subjects-grid {
        grid-template-columns: 1fr;
    }
    .welcome-box h2 {
        font-size: 1.8rem;
    }
    .modal-content {
        max-height: 90vh;
    }
    .doc-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    .doc-item .btn {
        width: 100%;
        justify-content: center;
    }
    .doc-actions-wrapper {
        width: 100%;
        align-items: stretch;
    }
    .doc-share-link {
        width: 100%;
    }
}

@media (max-width: 400px) {
    .logo-text {
        font-size: 1.1rem !important;
        max-width: 135px;
    }
    .nav-container {
        padding: 8px 10px;
    }
    .theme-toggle {
        width: 34px;
        height: 34px;
        font-size: 1rem;
    }
    .admin-header h2 {
        font-size: 1.15rem;
    }
    .admin-header p {
        font-size: 0.75rem;
    }
}

/* Announcement Marquee Bar */
.announcement-bar {
    display: flex;
    align-items: center;
    background: rgba(245, 158, 11, 0.08); /* Soft amber tint */
    border: 1px solid rgba(245, 158, 11, 0.25);
    border-radius: 14px;
    padding: 12px 20px;
    margin-bottom: 25px;
    overflow: hidden;
    gap: 15px;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.05);
}

[data-theme="light"] .announcement-bar {
    background: rgba(245, 158, 11, 0.05);
    border-color: rgba(245, 158, 11, 0.3);
}

.announcement-label {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #f59e0b; /* Amber warning color */
    font-weight: 700;
    font-size: 0.85rem;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    animation: pulse-glow 2s infinite ease-in-out;
}

.announcement-marquee {
    flex: 1;
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
}

.announcement-marquee a {
    text-decoration: none;
    display: inline-block;
}

.announcement-marquee span {
    display: inline-block;
    white-space: nowrap;
    font-size: 0.95rem;
    font-weight: 500;
    color: #fca5a5; /* Bright coral-ish text for dark mode */
    animation: marquee-scroll 12s linear infinite;
    padding-left: 100%;
}

[data-theme="light"] .announcement-marquee span {
    color: #b45309; /* Dark amber text for light mode */
}

/* Keyframes for smooth scrolling */
@keyframes marquee-scroll {
    0% {
        transform: translate3d(0, 0, 0);
    }
    100% {
        transform: translate3d(-100%, 0, 0);
    }
}

/* Pulse animation for notice label */
@keyframes pulse-glow {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(0.98);
    }
}

/* Custom Sliding Toggle Switch */
.switch-toggle input:checked + .switch-slider {
    background-color: var(--success) !important;
    border-color: var(--success) !important;
}

.switch-slider::before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: #fff;
    transition: .3s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.switch-toggle input:checked + .switch-slider::before {
    transform: translateX(24px);
}