:root {
    --bg: #f6f4ef;
    --card: #ffffff;
    --text: #1a1a1a;
    --muted: #5c5c5c;
    --primary: #c45c26;
    --primary-dark: #9a4520;
    --border: #e0dbd3;
    --overdue: #b42318;
    --due-soon: #b54708;
    --success-bg: #e8f5e9;
    --error-bg: #fdecea;
    --info-bg: #e8f0fe;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 1.5rem;
}

.site-header {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    margin-bottom: 1rem;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.logo {
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

nav a {
    margin-left: 1rem;
    color: var(--text);
    text-decoration: none;
}

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

.user-menu {
    position: relative;
    display: inline-block;
    margin-left: 1rem;
}

.user-menu-trigger {
    list-style: none;
    cursor: pointer;
    color: var(--muted);
    font-size: 0.9rem;
    padding: 0.25rem 0;
}

.user-menu-trigger::-webkit-details-marker {
    display: none;
}

.user-menu-trigger::after {
    content: " ▾";
    font-size: 0.75rem;
}

.user-menu[open] .user-menu-trigger {
    color: var(--primary);
}

.user-menu-panel {
    position: absolute;
    right: 0;
    top: calc(100% + 0.35rem);
    min-width: 12rem;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 0.35rem 0;
    z-index: 100;
}

.user-menu-panel a {
    display: block;
    margin: 0;
    padding: 0.5rem 1rem;
    color: var(--text);
    text-decoration: none;
    font-size: 0.9rem;
    white-space: nowrap;
}

.user-menu-panel a:hover {
    background: var(--bg);
    color: var(--primary);
}

.user-menu-logout {
    border-top: 1px solid var(--border);
    margin-top: 0.25rem;
    padding-top: 0.65rem !important;
}

.settings-back {
    margin: 0 0 0.5rem;
    font-size: 0.9rem;
}

.settings-back a {
    color: var(--muted);
    text-decoration: none;
}

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

.settings-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0;
}

.settings-list-item {
    margin-bottom: 0.5rem;
}

.settings-list-link {
    display: block;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s;
}

.settings-list-link:hover {
    border-color: var(--primary);
}

.settings-list-title {
    display: block;
    font-weight: 600;
    color: var(--text);
}

.settings-list-desc {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.9rem;
    color: var(--muted);
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.login-card {
    max-width: 440px;
    margin: 3rem auto;
}

.account-type-fieldset {
    border: none;
    margin: 0 0 1.25rem;
    padding: 0;
}

.account-type-fieldset legend {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.account-type-options {
    display: flex;
    gap: 0.75rem;
}

.account-type-option {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    background: var(--bg);
}

.account-type-option:has(input:checked) {
    border-color: var(--primary);
    background: color-mix(in srgb, var(--primary) 8%, var(--bg));
}

.account-type-option input {
    margin: 0;
}

.auth-link {
    margin-top: 1.25rem;
    text-align: center;
    color: var(--muted);
    font-size: 0.95rem;
}

.auth-link a {
    color: var(--primary);
}

.optional {
    font-weight: 400;
    color: var(--muted);
    font-size: 0.85rem;
}

.invite-code-display {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin: 0.75rem 0;
}

.invite-code-badge {
    font-family: ui-monospace, "Cascadia Code", monospace;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    padding: 0.5rem 1rem;
    background: var(--bg);
    border: 1px dashed var(--primary);
    border-radius: 6px;
    color: var(--primary-dark);
}

.invite-code-input {
    font-family: ui-monospace, "Cascadia Code", monospace;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.inline-form-row {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

.inline-form-row input {
    flex: 1;
    min-width: 10rem;
}

.connect-tutor-form label {
    margin-top: 0;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.form label {
    display: block;
    margin-top: 1rem;
    margin-bottom: 0.35rem;
    font-weight: 600;
}

.form input[type="text"],
.form input[type="email"],
.form input[type="password"],
.form input[type="datetime-local"],
.form select,
.form textarea {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font: inherit;
}

.form input[type="file"] {
    margin-top: 0.25rem;
}

.btn {
    display: inline-block;
    margin-top: 1.25rem;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 6px;
    font: inherit;
    cursor: pointer;
    text-decoration: none;
}

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

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

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.data-table th,
.data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background: #faf8f5;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    background: #eee;
}

.badge-overdue {
    background: #fdecea;
    color: var(--overdue);
    font-weight: 600;
}

.badge-due-soon {
    background: #fef0e6;
    color: var(--due-soon);
    font-weight: 600;
}

.row-overdue {
    background: #fff5f5;
}

.row-due-soon {
    background: #fffaf5;
}

.dashboard-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: center;
}

.dashboard-controls label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.dashboard-controls select {
    padding: 0.35rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--card);
}

.reminder-toggle-form {
    margin-top: 0.75rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.badge-info {
    background: var(--info-bg);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    display: inline-block;
    margin-bottom: 1rem;
}

.flash-messages {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem;
}

.flash {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-bottom: 0.5rem;
}

.flash-success { background: var(--success-bg); }
.flash-error { background: var(--error-bg); }
.flash-info { background: var(--info-bg); }

.meta {
    color: var(--muted);
    font-size: 0.95rem;
}

.description {
    white-space: pre-wrap;
    margin: 1rem 0;
}

.media-block {
    margin: 1rem 0;
    padding: 1rem;
    background: #faf8f5;
    border-radius: 6px;
}

.preview-image {
    max-width: 100%;
    border-radius: 4px;
    margin-top: 0.5rem;
}

.text-answer {
    white-space: pre-wrap;
    background: #faf8f5;
    padding: 1rem;
    border-radius: 6px;
}

.feedback-section {
    margin: 1.5rem 0;
    padding: 1rem;
    background: var(--success-bg);
    border-radius: 6px;
}

.empty-state {
    color: var(--muted);
    font-style: italic;
}

.hint {
    font-size: 0.85rem;
    color: var(--muted);
}

.btn-secondary {
    background: #eee;
    color: var(--text);
}

.btn-secondary:hover {
    background: #ddd;
}

.section-heading {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.exercise-block {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    background: #faf8f5;
}

.exercise-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.exercise-block h3,
.exercise-section h2 {
    margin-top: 0;
}

.exercise-readonly {
    background: #f0f0f0;
}

.exercise-section {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.exercise-section h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.submission-group {
    margin-top: 2rem;
}

.submission-group h2 {
    margin-bottom: 0.75rem;
    font-size: 1.15rem;
}

.submission-group:first-of-type {
    margin-top: 1rem;
}

.submission-block {
    margin: 1rem 0;
    padding: 1rem;
    background: #faf8f5;
    border-radius: 6px;
}

.submission-history {
    margin-top: 1.25rem;
}

.submission-history summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--primary);
}

.submission-history-item {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: #faf8f5;
    border-radius: 6px;
}

.feedback {
    margin-top: 0.5rem;
    color: var(--muted);
}

audio {
    width: 100%;
    margin-top: 0.5rem;
}