/**
 * Lesson Page Styles
 * 
 * This file contains styles for lesson content pages across all language modules.
 * It uses CSS variables defined in variables.css for theming.
 */

/* || General Layout */

body {
    overflow-x: auto;
}

#lesson-content-wrapper {
    display: grid;
    grid-template-columns: 1fr 30%;
    gap: 3vw;
    padding: 3vw;
    transition: grid-template-columns 0.25s ease, gap 0.25s ease, padding 0.25s ease;
}

.directory-collapsed #lesson-content-wrapper {
    grid-template-columns: 1fr;
}

.directory-collapsed #lesson-container {
    max-width: 90vw;
}

#lesson-container {
    max-width: 70vw;
    margin: 0 auto;
    padding: 2.5rem 3vw;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-round);
    box-shadow: var(--shadow-soft);
}

.edit-page-link {
    position: fixed;
    left: 1.25rem;
    bottom: 1.25rem;
    z-index: calc(var(--z-index-nav) + 1);
    width: 2.75rem;
    height: 2.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid var(--border-subtle);
    background: var(--bg-surface);
    color: var(--colour-accent-strong);
    box-shadow: var(--shadow-soft);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.edit-page-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

.edit-icon {
    width: 1.25rem;
    height: 1.25rem;
    display: block;
}

.lesson-footer {
    width: 100%;
    margin: 0 auto;
    padding: 0 1rem 1rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--colour-muted);
}

.mobile-edit-link {
    display: none;
    color: var(--colour-accent-strong);
    text-decoration: none;
    font-weight: 600;
}

.mobile-edit-link:hover {
    text-decoration: underline;
}

.lesson-copyright {
    margin: 0.5rem 0 0;
}

/* || Typography */

#lesson-container .lesson-title {
    text-align: center;
    font-size: var(--font-size-title-lg);
    line-height: var(--line-height-title-lg);
    margin: 2rem auto 2.5rem;
    color: var(--colour-primary);
    font-weight: 700;
    letter-spacing: -0.02em;
}

#lesson-container h1 {
    font-family: var(--font-family-title);
    font-size: var(--font-size-header-1);
    line-height: var(--line-height-header-lg);
    margin-bottom: 0.75rem;
    margin-top: 1.5rem;
    font-weight: 700;
    color: var(--colour-primary);
}

#lesson-container h2 {
    font-family: var(--font-family-title);
    font-size: var(--font-size-header-2);
    line-height: var(--line-height-header-md);
    margin-bottom: 0.625rem;
    margin-top: 1.25rem;
    font-weight: 700;
    color: var(--colour-primary);
}

#lesson-container h3 {
    font-family: var(--font-family-title);
    font-size: var(--font-size-header-3);
    margin-bottom: 0.5rem;
    margin-top: 1rem;
    font-weight: 600;
    color: var(--colour-primary);
}

#lesson-container h4 {
    font-family: var(--font-family-title);
    font-size: var(--font-size-header-4);
    margin-bottom: 0.375rem;
    margin-top: 0.75rem;
    font-weight: 600;
    color: var(--colour-primary);
}

#lesson-content {
    font-size: 1rem;
    line-height: 1.6;
}

/* || Note Blocks */

#lesson-container .note {
    background-color: var(--bg-note-info);
    border-left: 4px solid var(--border-note-info);
    border-radius: var(--radius-medium);
    padding: 1rem;
    margin: 1rem 0;
    box-shadow: var(--shadow-card);
}

#lesson-container .note p {
    margin: 0.3rem 0 0 0;
    color: var(--colour-primary);
}

#lesson-container .note strong.label {
    font-weight: 700;
    font-size: 0.875rem;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
}

#lesson-container .note.info {
    background-color: var(--bg-note-info);
    border-left-color: var(--border-note-info);
}

#lesson-container .note.tip {
    background-color: var(--bg-note-tip);
    border-left-color: var(--border-note-tip);
}

#lesson-container .note.warning {
    background-color: var(--bg-note-warning);
    border-left-color: var(--border-note-warning);
}

/* || Content Blocks */

#lesson-container .block {
    margin-bottom: 1rem;
    padding: 1.25rem 1rem;
    border-radius: var(--radius-round);
    box-shadow: var(--shadow-soft);
    text-align: center;
    font-size: 1.125rem;
    border: 1px solid var(--border-subtle);
    transition: transform var(--transition-base);
}

#lesson-container .block:hover {
    transform: translateY(-2px);
}

#lesson-container .block.blockquote {
    background: linear-gradient(135deg, var(--bg-block-quote) 0%, var(--bg-surface) 100%);
    border-color: var(--border-subtle);
    color: var(--colour-primary);
}

#lesson-container .block.warning {
    background: linear-gradient(135deg, var(--bg-block-warning) 0%, var(--bg-surface) 100%);
    border-color: var(--border-subtle);
    color: var(--colour-primary);
}

#lesson-container .block.subject {
    background: linear-gradient(135deg, var(--bg-note-info) 0%, var(--bg-surface) 100%);
    border-color: var(--border-subtle);
    color: var(--colour-primary);
    font-size: 1.05rem;
}

/* || Tables */

#lesson-container table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background-color: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-round);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

#lesson-container table thead {
    background: var(--colour-thead);
    color: var(--colour-text-on-accent);
}

#lesson-container table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    letter-spacing: 0.5px;
}

#lesson-container table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--colour-text);
}

#lesson-container table tbody tr {
    transition: background-color 0.2s ease;
}

#lesson-container table tbody tr:hover {
    background-color: var(--bg-surface-muted);
}

#lesson-container table tbody tr:last-child td {
    border-bottom: none;
}

#lesson-container table tbody tr:nth-child(odd) {
    background-color: var(--bg-card);
}

#lesson-container table tbody tr:nth-child(even) {
    background-color: var(--bg-surface-muted);
}

/* || Spoiler Elements */

#lesson-container .spoiler {
    filter: blur(8px);
    padding: 0 0.25rem;
    cursor: pointer;
    transition: filter 0.2s ease;
    user-select: none;
    background-color: var(--colour-overlay-soft);
    border-radius: var(--radius-small);
}

#lesson-container .spoiler a,
#lesson-container .spoiler button,
#lesson-container .spoiler input {
    pointer-events: none;
}

#lesson-container .spoiler:hover,
#lesson-container .spoiler:active {
    filter: blur(5px);
}

#lesson-container .spoiler.revealed {
    filter: none;
    cursor: default;
    user-select: text;
}

#lesson-container .spoiler.revealed a,
#lesson-container .spoiler.revealed button,
#lesson-container .spoiler.revealed input {
    pointer-events: auto;
}

/* || Directory Panel */

#directory-panel {
    position: fixed;
    top: 120px;
    right: 2rem;
    height: calc(100vh - 140px);
    width: 16rem;
    padding: 0;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-round);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transform: translateX(0);
    opacity: 1;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.directory-collapsed #directory-panel {
    transform: translateX(110%);
    opacity: 0;
    pointer-events: none;
}

.directory-open #directory-panel {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
}

.directory-toggle {
    position: fixed;
    right: 1.25rem;
    bottom: 1.25rem;
    z-index: calc(var(--z-index-nav) + 1);
    display: none;
    align-items: center;
    gap: 0.5rem;
    background: var(--colour-accent-strong);
    color: var(--colour-text-on-accent);
    border: none;
    border-radius: var(--radius-pill);
    padding: 0.75rem 1.25rem;
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: var(--shadow-soft);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.directory-toggle-icon {
    width: 1.25rem;
    height: 1.25rem;
    display: block;
    transition: transform 0.25s ease;
}

.directory-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 22px var(--colour-overlay-strong);
    background: var(--colour-table-head);
}

.directory-collapsed .directory-toggle {
    display: inline-flex;
}

.directory-toggle.is-open .directory-toggle-icon {
    transform: rotate(180deg);
}

/* || Responsive Breakpoints */
/* See https://www.w3schools.com/howto/howto_css_media_query_breakpoints.asp */
@media (max-width: 1024px) {
    #directory-panel {
        width: 75vw;
        max-width: 20rem;
        right: 1rem;
        top: calc(var(--nav-height) + 1rem);
        height: calc(100vh - var(--nav-height) - 2rem);
    }

    .directory-toggle {
        display: inline-flex;
    }
}

#directory-panel .directory-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-subtle);
    background: var(--bg-surface-muted);
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--colour-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

#directory-results {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    flex: 1;
    padding: 0.5rem 0;
}

#directory-results:empty::after {
    content: "No headings";
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--colour-muted);
    font-size: 0.875rem;
    font-style: italic;
    padding: 2rem 1rem;
    text-align: center;
}

.directory-indent {
    display: flex;
    align-items: center;
    border-left: 3px solid transparent;
    min-height: 2rem;
    transition: border-color 0.2s ease, background-color 0.2s ease;
    margin: 0.125rem 0;
}

.directory-link {
    width: 100%;
    font-size: 0.8125rem;
    color: var(--colour-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    transition: color var(--transition-base);
    display: block;
    line-height: 1.4;
}

.directory-indent:hover .directory-link {
    color: var(--colour-accent);
}

.directory-indent.active {
    border-left-color: var(--colour-accent);
    background: var(--colour-accent-soft);
}

.directory-indent.active .directory-link {
    color: var(--colour-accent);
    font-weight: 600;
}

/* Directory indentation levels */
.level-1 { padding-left: 0.75rem; }
.level-2 { padding-left: 1.5rem; }
.level-3 { padding-left: 2.25rem; }
.level-4 { padding-left: 3rem; }
.level-5 { padding-left: 3.75rem; }
.level-6 { padding-left: 4.5rem; }

/* || Quiz Styles */

.quiz {
    margin: 2rem 0;
    padding: 2rem;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-round);
    background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-surface-muted) 100%);
    box-shadow: var(--shadow-soft);
}

.quiz .quiz-loading {
    height: 15rem;
}

.quiz .quiz-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--colour-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-subtle);
}

.quiz .quiz-question {
    margin-bottom: 1.5rem;
    font-weight: 600;
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--colour-primary);
    padding: 1rem;
    background: var(--bg-surface);
    border-radius: var(--radius-medium);
    border-left: 4px solid var(--colour-accent);
    box-shadow: var(--shadow-card);
}

/* Quiz options list */
.quiz ul {
    list-style-type: none;
    padding: 0;
    display: grid;
    gap: 0.5rem;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: repeat(auto-fit, minmax(2.5rem, auto));
}

.quiz ul li {
    padding: 1rem 1.25rem;
    border: 2px solid var(--border-subtle);
    border-radius: var(--radius-medium);
    background-color: var(--bg-surface);
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--colour-primary);
    font-weight: 500;
    display: flex;
    align-items: center;
    min-height: 3rem;
}

.quiz ul li .quiz-option-text {
    display: block;
    width: 100%;
    line-height: 1.7;
    overflow-wrap: anywhere;
}

.quiz ul li ruby {
    ruby-position: over;
    ruby-align: center;
    white-space: nowrap;
}

.quiz ul li ruby rt {
    font-size: 0.66em;
    line-height: 1;
    margin-top: 0;
}

.quiz ul li:hover {
    background-color: var(--bg-surface-muted);
    border-color: var(--colour-accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--colour-focus-ring);
}

.quiz ul li.quiz-correct {
    background-color: var(--bg-quiz-correct);
    border-color: var(--colour-quiz-correct);
    color: var(--colour-primary);
    font-weight: 600;
}

.quiz ul li.quiz-incorrect {
    background-color: var(--bg-quiz-incorrect);
    border-color: var(--colour-quiz-incorrect);
    color: var(--colour-primary);
    font-weight: 600;
}

/* Quiz input fields */
.quiz .quiz-input-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.quiz input.quiz-input {
    width: 100%;
    padding: 0.875rem 1.25rem;
    font-size: 1rem;
    border: 2px solid var(--border-subtle);
    border-radius: var(--radius-medium);
    box-sizing: border-box;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: var(--bg-surface);
    font-weight: 500;
}

.quiz input.quiz-input:focus {
    border-color: var(--colour-accent);
    outline: none;
    box-shadow: 0 0 0 3px var(--colour-focus-ring);
}

.quiz input.quiz-input.quiz-correct {
    border-color: var(--colour-quiz-correct);
    background-color: var(--bg-quiz-correct);
}

.quiz input.quiz-input.quiz-incorrect {
    border-color: var(--colour-quiz-incorrect);
    background-color: var(--bg-quiz-incorrect);
}

/* Quiz validation feedback */
.quiz div.quiz-valid-label {
    margin-top: 1rem;
    font-weight: 600;
}

.quiz ul.quiz-valid-list {
    margin-top: 0.3rem;
    color: var(--colour-secondary);
}

/* Quiz controls and progress */
.quiz .quiz-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-subtle);
}

.quiz .quiz-controls-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.quiz .quiz-progress {
    color: var(--colour-primary);
    text-align: left;
    font-size: 0.875rem;
    font-weight: 600;
    background: var(--bg-surface);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-card);
}

.quiz .quiz-audio-toggle {
    min-width: 2.5rem;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border-radius: 50%;
    font-size: 1rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.quiz .quiz-audio-toggle.is-muted {
    background-color: var(--colour-muted);
}

/* Quiz buttons */
.quiz button {
    font-weight: 600;
    font-size: 1rem;
    color: var(--colour-text-on-accent);
    background-color: var(--colour-accent-strong);
    border: none;
    border-radius: var(--radius-medium);
    padding: 0.75rem 2rem;
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-card);
    letter-spacing: 0.02em;
}

.quiz button:hover {
    background-color: var(--colour-table-head);
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

.quiz button:disabled {
    background-color: var(--colour-muted);
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
}

/* Quiz explanation */
.quiz .quiz-explanation {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--bg-surface);
    border-radius: var(--radius-medium);
    border: 1px solid var(--border-subtle);
}

.quiz-explanation[hidden] {
    display: none !important;
}

.quiz .quiz-explanation > .quiz-explanation-block {
    padding: 1rem;
    background: var(--bg-surface-muted);
    border-left: 4px solid var(--colour-accent);
    border-radius: var(--radius-medium);
    font-size: 0.95rem;
    line-height: 1.6;
}

.quiz .quiz-next-btn {
    min-width: 9rem;
    width: auto;
    margin-left: auto;
}

.quiz .actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

.quiz .quiz-restart-btn {
    margin: 0 auto;
    padding: 1rem 0;
    width: 60%;
}

/* Quiz summary */
.quiz-summary .quiz-header {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
    margin-bottom: 1rem;
    color: var(--colour-accent);
    letter-spacing: -0.02em;
}

.quiz-summary p.quiz-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: var(--colour-secondary);
    margin: 0;
    margin-bottom: 2rem;
    display: block;
}

.quiz-summary .quiz-score {
    text-align: center;
    font-size: 3rem;
    font-weight: 700;
    color: var(--colour-primary);
    margin: 2rem 0;
    padding: 2rem;
    background: var(--bg-surface);
    border-radius: var(--radius-round);
    border: 2px solid var(--border-subtle);
    box-shadow: var(--shadow-card);
}

/* || Responsive Breakpoints */

@media (max-width: 1024px) {
    #lesson-content-wrapper {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 2rem;
    }

    #lesson-container {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    body {
        overflow-x: hidden;
    }

    .edit-page-link {
        display: none;
    }

    .mobile-edit-link {
        display: inline;
    }

    #lesson-content-wrapper {
        padding: 1.5rem;
    }

    #lesson-container {
        padding: 1.75rem 1.5rem;
    }

    #lesson-container .lesson-title {
        font-size: 2.1rem;
        line-height: 2.4rem;
        margin: 1.5rem auto 2rem;
    }

    #lesson-container h1 {
        font-size: 1.9rem;
    }

    #lesson-container h2 {
        font-size: 1.6rem;
    }

    #lesson-container h3 {
        font-size: 1.35rem;
    }

    #lesson-container table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    .quiz {
        padding: 1.5rem;
    }

    .quiz ul {
        grid-template-columns: 1fr;
    }

    .quiz .quiz-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .quiz .quiz-controls-left {
        justify-content: space-between;
    }

    .quiz .quiz-next-btn,
    .quiz .quiz-restart-btn {
        width: 100%;
    }

    .quiz-summary .quiz-score {
        font-size: 2.2rem;
        padding: 1.5rem;
    }
}

@media (max-width: 600px) {
    #lesson-content-wrapper {
        padding: 1rem;
    }

    #lesson-container {
        padding: 1.5rem 1.1rem;
    }

    #directory-panel {
        width: 90vw;
        max-width: none;
        right: 0.75rem;
    }

    .directory-toggle {
        right: 0.75rem;
        bottom: 0.75rem;
    }
}