@import url('https://fonts.googleapis.com/css2?family=Merriweather:wght@400;600;700&family=Merriweather+Sans:wght@500;600;700&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Merriweather', 'Times New Roman', serif !important;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1200px !important;
    margin: 0 auto !important;
    background-color: #ffffff !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

.content-wrapper {
    max-width: 1200px !important;
    margin: 0 auto !important;
    background-color: #ffffff !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

header {
    background-color: #003366;
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-family: 'Merriweather Sans', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    font-size: 42px !important;
    margin: 0 0 10px !important;
    color: white !important;
}

header .subtitle {
    font-size: 18px;
    color: #cccccc;
}

.credit {
    background-color: #fff8f0;
    border-left: 4px solid #FF6600;
    padding: 20px 30px;
    margin: 0;
    font-size: 14px;
}

.credit p {
    margin: 5px 0;
}

nav {
    background-color: #f9f9f9;
    padding: 20px 30px;
    border-bottom: 2px solid #ddd;
    position: sticky;
    top: 0;
    z-index: 100;
    font-family: 'Merriweather Sans', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif !important;
}

nav h3 {
    font-family: 'Merriweather Sans', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif !important;
    color: #003366;
    font-size: 16px;
    margin-bottom: 10px;
}

nav a {
    color: #003366;
    text-decoration: none;
    margin-right: 20px;
    font-size: 14px;
    font-family: 'Merriweather Sans', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif !important;
}

nav a:hover {
    color: #FF6600;
    text-decoration: underline;
}

#course-navbar,
#course-navbar a,
#course-navbar span {
    font-family: 'Merriweather Sans', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif !important;
}

#course-navbar .container {
    background: transparent !important;
    box-shadow: none !important;
    width: 100% !important;
    max-width: 100% !important;
}

section {
    padding: 40px 30px;
    border-bottom: 1px solid #eee;
}

section:last-of-type {
    border-bottom: none;
}

/* Unified heading styles - all headings use Merriweather Sans */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Merriweather Sans', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

h2 {
    color: #003366 !important;
    font-size: 36px !important;
    margin-bottom: 20px !important;
    padding-bottom: 10px !important;
    border-bottom: 3px solid #FF6600 !important;
}

h3 {
    color: #FF6600 !important;
    font-size: 28px !important;
    margin-top: 30px !important;
    margin-bottom: 15px !important;
}

h4 {
    color: #003366 !important;
    font-size: 22px !important;
    margin-top: 20px !important;
    margin-bottom: 10px !important;
}

p {
    margin-bottom: 15px;
    font-size: 16px;
}

ul {
    margin-left: 30px;
    margin-bottom: 20px;
}

li {
    margin-bottom: 10px;
    font-size: 16px;
}

.definition {
    background-color: #f9f9f9;
    border-left: 4px solid #003366;
    padding: 15px 20px;
    margin: 15px 0;
    font-style: italic;
}

.example-box {
    background-color: #e8f4f8;
    border-left: 4px solid #5A9FBC;
    padding: 20px;
    margin: 20px 0;
}

.example-box h4 {
    color: #003366;
    margin: 0 0 10px;
    font-size: 18px;
}

.example-box p {
    margin-bottom: 10px;
}

.tip-box {
    background-color: #fff8f0;
    border-left: 4px solid #FF6600;
    padding: 20px;
    margin: 20px 0;
}

.tip-box h4 {
    color: #FF6600;
    margin-bottom: 10px;
    font-size: 18px;
}

.intro-box {
    background-color: #fff8f0;
    border-left: 4px solid #FF6600;
    padding: 20px;
    margin: 20px 0;
}

.emphasis-box {
    background-color: #e8f4f8;
    border: 2px solid #003366;
    padding: 20px;
    margin: 20px 0;
    border-radius: 5px;
}

.section-box {
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    padding: 25px;
    margin: 20px 0;
    border-radius: 5px;
}

.diagram {
    background-color: #f9f9f9;
    border: 2px solid #003366;
    padding: 30px;
    margin: 25px 0;
    text-align: center;
    border-radius: 5px;
}

.diagram-title {
    font-weight: bold;
    font-size: 18px;
    color: #003366;
    margin-bottom: 20px;
}

.pulse-row {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 15px 0;
    gap: 10px;
}

.pulse-label {
    font-weight: bold;
    font-size: 16px;
    min-width: 150px;
    text-align: right;
    padding-right: 20px;
}

.pulse-dots {
    display: flex;
    gap: 15px;
    align-items: center;
}

.dot {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 20px;
}

.dot.beat {
    background-color: #5A9FBC;
}

.dot.division-simple-1 {
    background-color: #D9534F;
}

.dot.division-simple-2 {
    background-color: #8BC34A;
}

.dot.division-compound-1 {
    background-color: #D9534F;
}

.dot.division-compound-2 {
    background-color: #8BC34A;
}

.dot.division-compound-3 {
    background-color: #FDD835;
}

.dot.accent {
    position: relative;
}

.dot.accent::after {
    content: '>';
    position: absolute;
    font-size: 24px;
    color: white;
}

.meter-sig {
    font-family: 'Georgia', serif;
    font-size: 48px;
    font-weight: bold;
    color: #003366;
    line-height: 0.8;
    display: inline-block;
    text-align: center;
}

.meter-sig-top {
    display: block;
}

.meter-sig-bottom {
    display: block;
    border-top: 2px solid #333;
    padding-top: 5px;
}

details {
    background: #fafafa;
    border: 1px solid #ccc;
    padding: 15px 20px;
    border-radius: 5px;
    margin-top: 30px;
}

summary {
    cursor: pointer;
    font-size: 18px;
    color: #003366;
    font-weight: bold;
}

#timeline-canvas-container {
    text-align: center;
    margin-top: 30px;
}

canvas {
    display: block;
    margin: 20px auto 0;
}

.counting-diagram {
    background-color: #ffffff;
    border: 2px solid #003366;
    padding: 20px;
    margin: 20px auto;
    text-align: center;
    border-radius: 5px;
    max-width: 600px;
}

.counting-text {
    font-size: 18px;
    font-family: 'Courier New', monospace;
    letter-spacing: 2px;
}

label {
    font-weight: bold;
}

input {
    padding: 5px 10px;
    margin: 5px;
    font-size: 16px;
}

button {
    padding: 8px 15px;
    background: #003366;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    font-size: 16px;
}

button:hover {
    background: #FF6600;
}

table {
    border-collapse: collapse;
    margin: 20px auto;
    width: 100%;
    border: 1px solid #000;
}

th {
    background-color: #bdc0bf;
    border: 1px solid #000;
    padding: 8px;
    font-weight: bold;
}

td {
    border: 1px solid #000;
    padding: 8px;
    text-align: center;
}

tr:nth-child(even) td {
    background-color: #eeeeee;
}

section img,
section video {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
}

section iframe {
    width: 100%;
    height: 600px;
    border: none;
    margin: 20px auto;
    display: block;
    aspect-ratio: 16 / 9;
}

.pulse-lab-embed {
    min-height: 1200px;
    height: 1200px;
}

figure {
    margin: 20px auto;
    text-align: center;
}

figcaption {
    font-size: 14px;
    color: #555;
    margin-top: 8px;
}

.video-link {
    display: inline-block;
    background-color: #003366;
    color: #ffffff;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    margin: 10px 0;
}

.tip {
    font-style: italic;
    color: #666;
    margin: 15px 0;
    padding-left: 15px;
    border-left: 3px solid #FF6600;
}

.formula {
    font-family: 'Courier New', monospace;
    background-color: #f5f5f5;
    padding: 15px;
    margin: 15px 0;
    border-left: 4px solid #003366;
}

footer {
    background-color: #f9f9f9;
    padding: 30px;
    text-align: center;
    color: #666;
    font-size: 14px;
    border-top: 2px solid #ddd;
}

/* ============================================================================ */
/* INTERACTIVE COMPONENT STYLES - Used in weeks 3-4 interactive lessons */
/* ============================================================================ */

/* Euclidean Algorithm Visualization Components (Week 3) */
.algorithm-container {
    background: #f8f9fa;
    border: 2px solid #003366;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
}

.algorithm-controls {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.algorithm-controls label {
    font-weight: bold;
    color: #003366;
}

.algorithm-controls input[type="number"] {
    width: 60px;
    padding: 5px 10px;
    border: 1px solid #003366;
    border-radius: 4px;
    font-size: 16px;
}

.algorithm-controls button {
    background: #003366;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

.algorithm-controls button:hover {
    background: #004d99;
}

.algorithm-controls button:disabled {
    background: #999;
    cursor: not-allowed;
}

.step-display {
    margin: 15px 0;
    padding: 15px;
    background: white;
    border-radius: 4px;
    min-height: 60px;
}

.step-label {
    font-weight: bold;
    color: #003366;
    margin-bottom: 10px;
    display: block;
}

.cells-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.cell {
    display: inline-flex;
    gap: 3px;
    padding: 8px 12px;
    background: #e8f0f8;
    border: 2px solid #003366;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 18px;
    transition: all 0.3s ease;
}

.cell.remainder {
    background: #fff3e0;
    border-color: #FF6600;
}

.cell.merged {
    background: #e0f0e8;
    border-color: #2e8b57;
}

.bit {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: bold;
}

.bit.one {
    background: #FF6600;
    color: white;
}

.bit.zero {
    background: #003366;
    color: white;
}

.result-display {
    margin-top: 20px;
    padding: 15px;
    background: #003366;
    color: white;
    border-radius: 6px;
    text-align: center;
}

.result-display .pattern {
    font-family: 'Courier New', monospace;
    font-size: 24px;
    letter-spacing: 4px;
    margin: 10px 0;
}

.result-display .onsets {
    font-size: 16px;
    color: #FFD580;
}

@keyframes highlight {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); box-shadow: 0 0 10px rgba(255, 102, 0, 0.5); }
    100% { transform: scale(1); }
}

.cell.animating {
    animation: highlight 0.5s ease;
}

.timeline-row {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: center;
    margin: 30px 0;
}

.timeline-item {
    text-align: center;
}

.timeline-item h4 {
    color: #003366;
    margin-bottom: 10px;
}

.timeline-item p {
    font-size: 14px;
    color: #666;
    max-width: 250px;
    margin: 10px auto 0;
}

.step-counter {
    font-size: 14px;
    color: #666;
    margin-left: auto;
}

.notation-placeholder {
    background: #f0f0f0;
    border: 2px dashed #003366;
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    color: #666;
    margin: 20px 0;
}

.key-insights {
    background: #e8f4f8;
    border-left: 4px solid #003366;
    padding: 20px;
    margin: 30px 0;
    border-radius: 0 8px 8px 0;
}

.key-insights h3 {
    color: #003366;
    margin-top: 0;
}

.key-insights ul {
    margin-bottom: 0;
}

.key-insights li {
    margin: 10px 0;
}

.status-bar {
    display: flex;
    gap: 20px;
    margin-top: 15px;
    padding: 12px 15px;
    background: linear-gradient(to right, #e8f0f8 50%, #fff3e0 50%);
    border-radius: 6px;
    font-size: 14px;
    align-items: center;
    flex-wrap: wrap;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-item.main {
    color: #003366;
    font-weight: bold;
}

.status-item.remainder {
    color: #cc5200;
    font-weight: bold;
}

/* ABC Music Notation Components (Week 4) */
.abc-container {
    margin: 30px 0;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 4px;
}

.abc-title {
    font-weight: bold;
    margin-bottom: 10px;
    color: #003366;
}

.abc-notation {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 15px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.abc-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    margin-bottom: 15px;
}

.abc-controls button {
    background-color: #003366;
    color: #fff;
    border: none;
    padding: 8px 18px;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.abc-controls button:hover {
    background-color: #004d99;
}

/* ============================================================================ */

@media (max-width: 768px) {
    header h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 24px;
    }

    h3 {
        font-size: 20px;
    }

    .pulse-row {
        flex-direction: column;
        gap: 10px;
    }

    .pulse-label {
        text-align: center;
        min-width: auto;
        padding-right: 0;
    }

    .dot {
        width: 40px;
        height: 40px;
    }

    nav a {
        display: block;
        margin: 5px 0;
    }
}

/* Fix week label width to prevent layout shift from navigation buttons */
#current-week-label {
    min-width: 120px;
    text-align: right;
}

/* ── Page layout: sidebar nav + main content ── */
.page-layout {
    display: flex;
    align-items: flex-start;
    gap: 0;
}

.main-content {
    flex: 1;
    min-width: 0;
}

/* Jump to Section — sticky left sidebar */
.section-nav {
    flex: 0 0 190px;
    position: sticky;
    top: 56px;
    max-height: calc(100vh - 56px);
    overflow-y: auto;
    background-color: #f9f9f9;
    border-right: 1px solid #e0e0e0;
    padding: 1.25rem 1rem;
    z-index: 40;
}

.section-nav h3 {
    color: #003366;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 0.75rem 0;
}

.section-nav a {
    display: block;
    color: #003366;
    text-decoration: none;
    font-size: 13px;
    line-height: 1.5;
    padding: 0.25rem 0 0.25rem 0.6rem;
    margin-bottom: 0.2rem;
    border-left: 2px solid transparent;
    transition: all 0.15s ease;
}

.section-nav a:hover {
    color: #FF6600;
    border-left-color: #FF6600;
}

@media (max-width: 900px) {
    .page-layout {
        flex-direction: column;
    }

    .section-nav {
        flex: none;
        position: static;
        width: 100%;
        max-height: none;
        border-right: none;
        border-bottom: 1px solid #e0e0e0;
        padding: 0.75rem 1rem;
    }

    .section-nav a {
        display: inline-block;
        border-left: none;
        padding-left: 0;
        margin-right: 1rem;
    }
}

/* Button styling for interactive lessons - match abc-controls */
.controls button,
#timeline-canvas-container button,
#playBtn,
#resetBtn {
    background-color: #003366 !important;
    color: #fff !important;
    border: none !important;
    padding: 8px 18px !important;
    border-radius: 4px !important;
    font-weight: 600 !important;
    cursor: pointer !important;
    transition: background-color 0.2s ease !important;
}

.controls button:hover,
#timeline-canvas-container button:hover,
#playBtn:hover,
#resetBtn:hover {
    background-color: #004d99 !important;
}

/* ============================================================================
   TEXTBOOK MODE OVERRIDES
   Applied when lesson-nav.js sets class="textbook-mode" on <body>.
   Hides course-calendar UI; shows chapter context instead.
   ============================================================================ */

/* Hide date/week lines in the credit block */
body.textbook-mode .credit [data-lesson-week] {
    /* replaced by chapter label injected by lesson-nav.js — keep visible */
}
body.textbook-mode .credit-date {
    display: none;
}

/* Hide the week label chip in the navbar */
body.textbook-mode #current-week-label {
    display: none !important;
}