:root {
    --bg: #f4f7fb;
    --bg-soft: #ffffff;
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --secondary: #06b6d4;
    --text: #111827;
    --muted: #6b7280;
    --border: #e5e7eb;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #f59e0b;
    --shadow: 0 18px 45px rgba(15, 23, 42, 0.12);
    --radius: 22px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}

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

a:hover {
    text-decoration: underline;
}

button,
input,
select,
textarea {
    font-family: inherit;
}

.flash {
    position: fixed;
    top: 18px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    padding: 14px 18px;
    border-radius: 14px;
    box-shadow: var(--shadow);
    font-size: 14px;
    font-weight: 700;
}

.flash-success {
    background: #dcfce7;
    color: #166534;
}

.flash-error {
    background: #fee2e2;
    color: #991b1b;
}

.alert {
    width: 100%;
    padding: 13px 15px;
    border-radius: 14px;
    font-size: 14px;
    margin-bottom: 18px;
    font-weight: 700;
}

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

.alert-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: #111827;
    color: #ffffff;
    padding: 24px 18px;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
}

.sidebar-logo {
    font-size: 22px;
    margin-bottom: 28px;
}

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

.sidebar-nav a {
    color: #d1d5db;
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 15px;
}

.sidebar-nav a:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
    text-decoration: none;
}

.main-content {
    margin-left: 260px;
    width: calc(100% - 260px);
    padding: 32px;
}

.page-header {
    margin-bottom: 28px;
}

.page-header h1 {
    margin: 0 0 8px;
    font-size: 30px;
}

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

.card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
}

.grid {
    display: grid;
    gap: 20px;
}

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

.stat-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
}

.stat-card span {
    display: block;
    color: var(--muted);
    font-size: 14px;
    margin-bottom: 10px;
}

.stat-card strong {
    display: block;
    font-size: 32px;
}

@media (max-width: 900px) {
    .sidebar {
        position: relative;
        width: 100%;
        bottom: auto;
    }

    .app-layout {
        display: block;
    }

    .main-content {
        margin-left: 0;
        width: 100%;
        padding: 20px;
    }

    .grid-3 {
        grid-template-columns: 1fr;
    }
}

.admin-form-card {
    margin-bottom: 26px;
}

.admin-form-card h2,
.table-card h2 {
    margin-top: 0;
}

.admin-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.admin-form label {
    display: flex;
    flex-direction: column;
    gap: 7px;
    font-weight: 800;
    font-size: 14px;
}

.admin-form input,
.admin-form select,
.admin-form textarea {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 13px 14px;
    font-size: 15px;
    outline: none;
    background: #ffffff;
}

.admin-form input:focus,
.admin-form select:focus,
.admin-form textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.checkbox-line {
    flex-direction: row !important;
    align-items: center;
    gap: 10px !important;
}

.checkbox-line input {
    width: auto;
}

.form-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.form-actions button,
.btn-secondary {
    border: none;
    border-radius: 14px;
    padding: 13px 17px;
    font-weight: 900;
    font-size: 15px;
    cursor: pointer;
}

.form-actions button {
    background: var(--primary);
    color: #ffffff;
}

.btn-secondary {
    background: #e5e7eb;
    color: #111827;
    text-decoration: none;
}

.responsive-table {
    width: 100%;
    overflow-x: auto;
}

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

table th,
table td {
    padding: 14px 12px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

table th {
    font-size: 13px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

table td small {
    display: block;
    color: var(--muted);
    margin-top: 5px;
}

.badge {
    display: inline-flex;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 900;
}

.badge-success {
    background: #dcfce7;
    color: #166534;
}

.badge-muted {
    background: #f3f4f6;
    color: #4b5563;
}

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

.actions a {
    font-weight: 800;
    font-size: 13px;
}

@media (max-width: 700px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
}

.answers-box {
    border: 1px solid var(--border);
    background: #f9fafb;
    border-radius: 18px;
    padding: 18px;
}

.answers-box h3 {
    margin: 0 0 14px;
}

.answer-admin-row {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px;
}

.radio-label {
    flex-direction: row !important;
    align-items: center;
    gap: 8px !important;
    margin: 0;
}

.radio-label input {
    width: auto;
}

@media (max-width: 700px) {
    .answer-admin-row {
        grid-template-columns: 1fr;
    }
}

.lesson-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.lesson-card {
    display: flex;
    gap: 16px;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 22px;
    box-shadow: var(--shadow);
    color: var(--text);
    text-decoration: none;
    transition: 0.18s ease;
}

.lesson-card:hover {
    transform: translateY(-3px);
    text-decoration: none;
    border-color: rgba(79, 70, 229, 0.45);
}

.lesson-icon {
    width: 54px;
    height: 54px;
    min-width: 54px;
    border-radius: 18px;
    background: #eef2ff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
}

.lesson-category {
    display: inline-flex;
    font-size: 12px;
    font-weight: 900;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 6px;
}

.lesson-content h2 {
    margin: 0 0 8px;
    font-size: 20px;
}

.lesson-content p {
    margin: 0 0 14px;
    color: var(--muted);
    line-height: 1.5;
}

.lesson-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}

.lesson-read-card {
    margin-bottom: 24px;
    line-height: 1.7;
}

.lesson-read-card h2 {
    margin-top: 0;
}

.lesson-text {
    color: #1f2937;
    font-size: 16px;
}

.exercise-list-card h2 {
    margin-top: 0;
}

.student-exercise-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.student-exercise-item {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: center;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 18px;
    background: #f9fafb;
}

.student-exercise-item h3 {
    margin: 0 0 6px;
}

.student-exercise-item p {
    margin: 0 0 10px;
    color: var(--muted);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    padding: 12px 16px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 900;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary:hover {
    background: var(--primary-dark);
    text-decoration: none;
}

@media (max-width: 1100px) {
    .lesson-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 760px) {
    .lesson-grid {
        grid-template-columns: 1fr;
    }

    .student-exercise-item {
        flex-direction: column;
        align-items: flex-start;
    }
}

.exercise-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.answer-option {
    display: flex;
    align-items: center;
    gap: 12px;
}

.answer-option input {
    width: 18px;
    height: 18px;
}

.exercise-actions {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    margin-top: 8px;
}

.btn-primary-btn {
    border: none;
    border-radius: 14px;
    padding: 12px 18px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 900;
    cursor: pointer;
    font-size: 15px;
}

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

.result-card {
    max-width: 760px;
    margin: 0 auto;
    border-radius: 30px;
    padding: 38px;
    text-align: center;
    box-shadow: var(--shadow);
    background: #ffffff;
    border: 1px solid var(--border);
}

.result-success {
    background:
        radial-gradient(circle at top, rgba(22, 163, 74, 0.18), transparent 38%),
        #ffffff;
}

.result-error {
    background:
        radial-gradient(circle at top, rgba(220, 38, 38, 0.14), transparent 38%),
        #ffffff;
}

.result-emoji {
    font-size: 70px;
    margin-bottom: 10px;
}

.result-card h1 {
    margin: 0 0 8px;
    font-size: 34px;
}

.result-card > p {
    color: var(--muted);
    margin-top: 0;
}

.result-score {
    display: inline-flex;
    margin: 20px 0;
    padding: 14px 22px;
    border-radius: 999px;
    background: #eef2ff;
    color: var(--primary-dark);
    font-weight: 900;
    font-size: 22px;
}

.result-details {
    text-align: left;
    background: #f9fafb;
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 20px;
    margin-top: 18px;
}

.result-details p {
    margin: 0 0 16px;
    line-height: 1.6;
}

.result-details p:last-child {
    margin-bottom: 0;
}

.result-actions {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 24px;
}

@media (max-width: 700px) {
    .exercise-actions {
        flex-direction: column;
    }

    .result-card {
        padding: 24px;
    }
}

.typing-card {
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.typing-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}

.typing-stats div,
.typing-result-grid div {
    background: #f9fafb;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 18px;
    text-align: center;
}

.typing-stats span,
.typing-result-grid span {
    display: block;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 8px;
}

.typing-stats strong,
.typing-result-grid strong {
    font-size: 24px;
}

.typing-source {
    background: #eef2ff;
    border: 1px solid #c7d2fe;
    border-radius: 20px;
    padding: 22px;
    line-height: 1.8;
    font-size: 18px;
    font-weight: 700;
    color: #1e1b4b;
}

.typing-label {
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-weight: 900;
}

.typing-label textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 18px;
    font-size: 18px;
    line-height: 1.7;
    outline: none;
    resize: vertical;
}

.typing-label textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}

.typing-actions {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    margin-top: 18px;
}

.typing-result-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-top: 24px;
}

@media (max-width: 900px) {
    .typing-stats,
    .typing-result-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 560px) {
    .typing-stats,
    .typing-result-grid {
        grid-template-columns: 1fr;
    }

    .typing-actions {
        flex-direction: column;
    }
}

.dashboard-two-columns {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 22px;
    margin-top: 24px;
}

.mini-stat-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    margin-top: 22px;
}

.mini-stat-list div,
.daily-goal div {
    background: #f9fafb;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px;
}

.mini-stat-list span,
.daily-goal span {
    display: block;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 8px;
}

.mini-stat-list strong,
.daily-goal strong {
    font-size: 20px;
}

.dashboard-tip-card h2 {
    margin-top: 0;
}

.dashboard-tip-card p {
    color: var(--muted);
    line-height: 1.7;
}

.daily-goal {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 20px;
}

.mini-result-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mini-result-item {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
    background: #f9fafb;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 15px;
}

.mini-result-item strong {
    display: block;
    margin-bottom: 5px;
}

.mini-result-item span {
    display: block;
    color: var(--muted);
    font-size: 13px;
}

.mini-result-item b {
    white-space: nowrap;
    color: var(--primary-dark);
}

@media (max-width: 1000px) {
    .dashboard-two-columns {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .mini-stat-list {
        grid-template-columns: 1fr;
    }

    .mini-result-item {
        flex-direction: column;
        align-items: flex-start;
    }
}

.badge-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.badge-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 26px;
    padding: 26px;
    text-align: center;
    box-shadow: var(--shadow);
}

.badge-card.earned {
    background:
        radial-gradient(circle at top, rgba(250, 204, 21, 0.18), transparent 38%),
        #ffffff;
}

.badge-icon {
    font-size: 60px;
    margin-bottom: 14px;
}

.badge-card h3 {
    margin: 0 0 10px;
}

.badge-card p {
    color: var(--muted);
    line-height: 1.6;
}

.badge-meta {
    margin-top: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.badge-earned-date {
    margin-top: 18px;
    font-size: 13px;
    color: var(--muted);
}

@media (max-width: 1000px) {
    .badge-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 650px) {
    .badge-grid {
        grid-template-columns: 1fr;
    }
}
.leaderboard-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.leaderboard-card h2 {
    margin-top: 0;
}

.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.leaderboard-item {
    display: grid;
    grid-template-columns: 54px 1fr auto;
    gap: 14px;
    align-items: center;
    background: #f9fafb;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 14px;
}

.leaderboard-item.is-me {
    background: #eef2ff;
    border-color: #c7d2fe;
}

.leaderboard-rank {
    width: 44px;
    height: 44px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 18px;
}

.leaderboard-user strong {
    display: block;
    margin-bottom: 4px;
}

.leaderboard-user span {
    color: var(--muted);
    font-size: 13px;
}

.leaderboard-score {
    text-align: right;
}

.leaderboard-score strong {
    display: block;
    color: var(--primary-dark);
}

.leaderboard-score span {
    color: var(--muted);
    font-size: 13px;
}

@media (max-width: 620px) {
    .leaderboard-item {
        grid-template-columns: 44px 1fr;
    }

    .leaderboard-score {
        grid-column: 2;
        text-align: left;
    }
}

.parent-student-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.parent-student-card {
    border-radius: 26px;
}

.parent-student-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.parent-student-header h2 {
    margin: 0 0 6px;
}

.parent-student-header span {
    color: var(--muted);
}

.parent-student-score {
    width: 78px;
    height: 78px;
    border-radius: 24px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 900;
}

.parent-actions {
    margin-top: 22px;
}

.parent-actions a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 18px;
    border-radius: 14px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 700;
    text-decoration: none;
}

@media (max-width: 1000px) {
    .parent-student-grid {
        grid-template-columns: 1fr;
    }
}

.homework-exercise-box {
    border: 1px solid var(--border);
    background: #f9fafb;
    border-radius: 18px;
    padding: 18px;
}

.homework-exercise-box h3 {
    margin-top: 0;
}

.homework-exercise-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.homework-exercise-item {
    display: flex !important;
    flex-direction: row !important;
    align-items: flex-start;
    gap: 12px !important;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 14px;
    cursor: pointer;
}

.homework-exercise-item input {
    width: auto;
    margin-top: 4px;
}

.homework-exercise-item strong {
    display: block;
    margin-bottom: 4px;
}

.homework-exercise-item small {
    display: block;
    color: var(--muted);
}

@media (max-width: 800px) {
    .homework-exercise-list {
        grid-template-columns: 1fr;
    }
}

.small-progress {
    height: 10px;
    max-width: 180px;
    margin-bottom: 6px;
}

.btn-danger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    padding: 13px 17px;
    background: #dc2626;
    color: #ffffff;
    font-weight: 900;
    text-decoration: none;
}

.btn-danger:hover {
    background: #991b1b;
    text-decoration: none;
}

.quest-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.quest-card {
    position: relative;
}

.quest-card.quest-complete {
    background:
        radial-gradient(circle at top right, rgba(22, 163, 74, 0.16), transparent 36%),
        #ffffff;
}

.quest-header {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 14px;
}

.quest-header h2 {
    margin: 0 0 6px;
}

.quest-header span {
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
}

.quest-reward {
    padding: 10px 14px;
    border-radius: 14px;
    background: #eef2ff;
    color: var(--primary-dark);
    font-weight: 900;
    white-space: nowrap;
}

.quest-footer {
    margin-top: 18px;
}

@media (max-width: 900px) {
    .quest-grid {
        grid-template-columns: 1fr;
    }
}

.profile-layout {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 24px;
}

.profile-card {
    text-align: center;
    height: fit-content;
}

.profile-avatar-box {
    width: 130px;
    height: 130px;
    margin: 0 auto 18px;
    border-radius: 34px;
    overflow: hidden;
    background: #eef2ff;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.profile-avatar-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 54px;
    font-weight: 900;
}

.profile-card h2 {
    margin: 0 0 6px;
}

.profile-card > p {
    margin: 0 0 22px;
    color: var(--muted);
}

.profile-meta {
    display: flex;
    flex-direction: column;
    gap: 12px;
    text-align: left;
    margin-bottom: 24px;
}

.profile-meta div {
    background: #f9fafb;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 14px;
}

.profile-meta span {
    display: block;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 5px;
}

.profile-meta strong {
    word-break: break-word;
}

.profile-avatar-form {
    text-align: left;
}

.profile-main {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

@media (max-width: 980px) {
    .profile-layout {
        grid-template-columns: 1fr;
    }
}