* {
    box-sizing: border-box;
}

:root {
    --bg: #f4efe7;
    --bg-2: #efe6d9;
    --panel: rgba(255, 252, 247, 0.82);
    --panel-strong: rgba(255, 250, 243, 0.94);
    --panel-dark: #1f2937;
    --line: rgba(101, 78, 55, 0.14);
    --line-strong: rgba(101, 78, 55, 0.22);
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #c26a2d;
    --primary-strong: #a9541a;
    --secondary: #0f766e;
    --secondary-soft: rgba(15, 118, 110, 0.12);
    --danger: #c2412d;
    --danger-soft: rgba(194, 65, 45, 0.12);
    --success: #1f8a5b;
    --success-soft: rgba(31, 138, 91, 0.12);
    --shadow-lg: 0 24px 60px rgba(75, 55, 35, 0.14);
    --shadow-md: 0 16px 32px rgba(75, 55, 35, 0.10);
    --radius-xl: 28px;
    --radius-lg: 22px;
    --radius-md: 16px;
    --radius-sm: 12px;
}

html,
body {
    min-height: 100%;
}

body {
    margin: 0;
    color: var(--text);
    font-family: "Segoe UI", "Trebuchet MS", Arial, sans-serif;
    background:
        radial-gradient(circle at top left, rgba(194, 106, 45, 0.16), transparent 28%),
        radial-gradient(circle at top right, rgba(15, 118, 110, 0.12), transparent 24%),
        linear-gradient(180deg, #f8f3eb 0%, var(--bg) 42%, var(--bg-2) 100%);
}

a {
    color: inherit;
    text-decoration: none;
}

.layout {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 290px 1fr;
}

.sidebar {
    position: relative;
    padding: 28px 18px;
    display: flex;
    flex-direction: column;
    gap: 22px;
    color: #f8f4ee;
    background:
        linear-gradient(180deg, rgba(36, 30, 24, 0.96), rgba(23, 19, 16, 0.98)),
        linear-gradient(135deg, rgba(194, 106, 45, 0.10), rgba(15, 118, 110, 0.08));
    border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.sidebar::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 20% 10%, rgba(255, 255, 255, 0.06), transparent 18%),
        linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.02));
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-mark {
    width: 52px;
    height: 52px;
    border-radius: 18px;
    display: grid;
    place-items: center;
    font-size: 22px;
    font-weight: 800;
    color: #fff7f0;
    background: linear-gradient(135deg, #d37a36, #ae4d16);
    box-shadow: 0 12px 26px rgba(194, 106, 45, 0.30);
}

.brand-title {
    font-size: 19px;
    font-weight: 800;
    letter-spacing: 0.01em;
}

.brand-subtitle {
    color: rgba(255, 244, 231, 0.68);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 13px 14px;
    border-radius: 14px;
    color: rgba(250, 244, 237, 0.82);
    border: 1px solid transparent;
    background: rgba(255, 255, 255, 0.02);
    transition: 0.2s ease;
}

.nav-link:hover {
    color: #fffaf3;
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.08);
    transform: translateX(2px);
}

.nav-link.active {
    color: #fffaf3;
    background: linear-gradient(135deg, rgba(194, 106, 45, 0.30), rgba(15, 118, 110, 0.16));
    border-color: rgba(226, 163, 116, 0.30);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.sidebar-footer {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.admin-pill {
    padding: 12px 14px;
    border-radius: 14px;
    color: #fff6ed;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.07);
    font-size: 14px;
}

.logout-link {
    color: #ffd8c7;
    font-size: 14px;
}

.content {
    padding: 32px;
}

.page-header {
    margin-bottom: 24px;
}

.page-header h1 {
    margin: 0 0 8px;
    font-size: 34px;
    line-height: 1.05;
    letter-spacing: -0.02em;
}

.page-header p {
    margin: 0;
    color: var(--muted);
    font-size: 15px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    position: relative;
    overflow: hidden;
    padding: 20px;
    border-radius: 20px;
    background: linear-gradient(180deg, rgba(255, 252, 247, 0.92), rgba(248, 241, 231, 0.88));
    border: 1px solid rgba(255, 255, 255, 0.75);
    box-shadow: var(--shadow-md);
}

.stat-card::before {
    content: "";
    position: absolute;
    inset: 0 auto auto 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.stat-card h3 {
    margin: 0 0 12px;
    color: var(--muted);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
}

.stat-card strong {
    font-size: 30px;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.panel {
    position: relative;
    overflow: hidden;
    padding: 20px;
    margin-bottom: 18px;
    border-radius: var(--radius-lg);
    background: var(--panel);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.72);
    box-shadow: var(--shadow-lg);
}

.panel::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.18), transparent 35%),
        linear-gradient(180deg, transparent, rgba(194, 106, 45, 0.02));
}

.panel h2 {
    position: relative;
    margin: 0 0 14px;
    font-size: 18px;
    letter-spacing: -0.02em;
}

.panel h2::after {
    content: "";
    display: block;
    width: 52px;
    height: 3px;
    margin-top: 8px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.grid-2,
.grid-3,
.grid-4 {
    display: grid;
    gap: 14px;
}

.grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 10px;
}

.field label {
    color: #3c4654;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.field input:not([type="checkbox"]):not([type="radio"]),
.field select,
.field textarea {
    width: 100%;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.74);
    color: var(--text);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55);
    transition: 0.2s ease;
}

.field input:not([type="checkbox"]):not([type="radio"]):focus,
.field select:focus,
.field textarea:focus {
    outline: none;
    border-color: rgba(194, 106, 45, 0.45);
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 0 0 4px rgba(194, 106, 45, 0.10);
}

.field textarea {
    min-height: 84px;
    resize: vertical;
}

.checkbox-row {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    align-items: center;
    margin: 10px 0 16px;
}

.checkbox-row label,
.inline-check {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.field input[type="checkbox"],
.field input[type="radio"] {
    accent-color: var(--primary);
}

.actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.btn,
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    border: none;
    padding: 10px 14px;
    border-radius: 12px;
    font-weight: 800;
    letter-spacing: 0.01em;
    transition: 0.2s ease;
}

.btn:hover,
button:hover {
    transform: translateY(-1px);
}

.btn-primary,
button[type="submit"] {
    color: #fff8f2;
    background: linear-gradient(135deg, var(--primary), var(--primary-strong));
    box-shadow: 0 14px 24px rgba(169, 84, 26, 0.22);
}

.btn-secondary {
    color: #24403d;
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.12), rgba(255, 255, 255, 0.58));
    border: 1px solid rgba(15, 118, 110, 0.18);
}

.btn-danger {
    color: #fff6f3;
    background: linear-gradient(135deg, #d05a3d, var(--danger));
    box-shadow: 0 12px 22px rgba(194, 65, 45, 0.20);
}

.btn:disabled,
button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.table-wrap {
    overflow-x: auto;
    border-radius: 18px;
    border: 1px solid rgba(255, 255, 255, 0.65);
    background: rgba(255, 255, 255, 0.46);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 14px 12px;
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid rgba(96, 72, 45, 0.08);
}

th {
    color: #5e6878;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 800;
    background: rgba(255, 255, 255, 0.45);
}

tbody tr:hover {
    background: rgba(194, 106, 45, 0.05);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 800;
}

.badge-success {
    background: var(--success-soft);
    color: var(--success);
}

.badge-muted {
    background: rgba(107, 114, 128, 0.12);
    color: #4b5563;
}

.badge-warning {
    background: rgba(194, 106, 45, 0.12);
    color: var(--primary-strong);
}

.badge-info {
    background: var(--secondary-soft);
    color: var(--secondary);
}

.alert {
    padding: 14px 16px;
    margin-bottom: 18px;
    border-radius: 14px;
    font-weight: 600;
}

.alert-success {
    color: var(--success);
    background: var(--success-soft);
    border: 1px solid rgba(31, 138, 91, 0.16);
}

.alert-error {
    color: var(--danger);
    background: var(--danger-soft);
    border: 1px solid rgba(194, 65, 45, 0.16);
}

.muted {
    color: var(--muted);
}

.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 28px;
    background:
        radial-gradient(circle at top left, rgba(194, 106, 45, 0.18), transparent 24%),
        radial-gradient(circle at bottom right, rgba(15, 118, 110, 0.16), transparent 22%),
        linear-gradient(180deg, #f8f1e8 0%, #f1e8dc 100%);
}

.login-card {
    width: 100%;
    max-width: 470px;
    padding: 30px;
    border-radius: 30px;
    background: rgba(255, 252, 247, 0.84);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid rgba(255, 255, 255, 0.82);
    box-shadow: 0 28px 60px rgba(94, 69, 40, 0.16);
}

.login-card h1 {
    margin: 0 0 10px;
    font-size: 34px;
    line-height: 1.05;
    letter-spacing: -0.03em;
}

.lesson-category-list,
.lesson-category-items {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.lesson-category-block {
    padding: 14px 16px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.42);
    border: 1px solid rgba(255, 255, 255, 0.65);
}

.lesson-category-header,
.lesson-category-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 14px;
}

.lesson-category-item {
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.58);
    border: 1px solid rgba(255, 255, 255, 0.75);
}

.lesson-category-item-main {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.lesson-category-item-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--muted);
    font-size: 13px;
}

.lesson-category-item-meta span {
    padding: 4px 8px;
    border-radius: 999px;
    background: rgba(15, 118, 110, 0.08);
}

.panel-compact {
    padding: 18px;
}

.compact-list {
    gap: 8px;
}

.compact-block {
    padding: 12px 14px;
}

.compact-items {
    gap: 8px;
}

.compact-item {
    padding: 10px 12px;
}

.compact-item strong {
    font-size: 14px;
    line-height: 1.35;
}

.compact-actions {
    gap: 8px;
}

.import-tab {
    padding: 10px 16px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.55);
    color: #4b5563;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s ease;
}

.import-tab:hover,
.import-tab.active {
    color: #fff8f2;
    background: linear-gradient(135deg, var(--primary), var(--primary-strong));
    border-color: transparent;
}

.import-toolbar,
.import-toolbar-actions,
.table-helper-tools {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.import-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.question-preview-card {
    padding: 18px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.58);
    border: 1px solid rgba(255, 255, 255, 0.75);
    box-shadow: var(--shadow-md);
}

.question-preview-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(15, 118, 110, 0.08);
}

.question-preview-title-wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.question-meta-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px 12px;
    align-items: end;
    margin-bottom: 12px;
}

.option-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.question-card-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(96, 72, 45, 0.10);
}

.questions-page {
    display: grid;
    gap: 18px;
}

.questions-page .panel {
    padding: 20px;
}

.questions-page .questions-filter-grid {
    grid-template-columns: minmax(170px, 0.9fr) minmax(260px, 1.45fr) minmax(150px, 0.75fr) auto;
    align-items: end;
}

.questions-page .question-create-meta-row {
    grid-template-columns: minmax(280px, 1.6fr) minmax(140px, 0.7fr) minmax(170px, 0.85fr);
    align-items: end;
}

.questions-page .questions-filter-actions {
    display: flex;
    align-items: flex-end;
}

.questions-page .table-wrap {
    background: rgba(255, 255, 255, 0.56);
}

.import-entry-panel .import-tabs {
    display: inline-flex;
    gap: 8px;
    margin-bottom: 18px;
    padding: 6px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.42);
    border: 1px solid rgba(255, 255, 255, 0.74);
}

.import-pdf-top-grid {
    display: grid;
    grid-template-columns: minmax(320px, 1.35fr) minmax(210px, 0.75fr) minmax(280px, 1fr) minmax(120px, 0.35fr);
    gap: 14px;
    align-items: end;
}

.import-past-field .inline-check {
    min-height: 48px;
    padding: 0 12px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid var(--line);
}

.mini-table-btn {
    border: 1px solid rgba(15, 118, 110, 0.16);
    background: rgba(15, 118, 110, 0.08);
    color: #155e59;
    border-radius: 999px;
    padding: 6px 10px;
    font-size: 11px;
    font-weight: 800;
    cursor: pointer;
}

.mini-table-btn:hover {
    background: rgba(15, 118, 110, 0.14);
}

@media (max-width: 1200px) {
    .import-pdf-top-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 920px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .content {
        padding: 20px;
    }

    .grid-2,
    .grid-3,
    .grid-4,
    .import-pdf-top-grid,
    .question-meta-grid,
    .option-grid,
    .questions-page .questions-filter-grid,
    .questions-page .question-create-meta-row {
        grid-template-columns: 1fr !important;
    }

    .lesson-category-header,
    .lesson-category-item,
    .question-preview-head,
    .import-toolbar {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 560px) {
    .page-header h1,
    .login-card h1 {
        font-size: 28px;
    }

    .panel,
    .login-card {
        padding: 20px;
        border-radius: 22px;
    }
}