/* ======================================
   LESSON PAGE STYLES - NIHONGOQU
   ====================================== */

/* ---- Base Styles ---- */

/* Gemini Exercise Card Styles */

.gemini-exercise-card {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    transition: all 0.3s ease;
    margin: 20px 0;
    border: 1px solid #dee2e6;
}

.gemini-exercise-card:hover {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}

.gemini-header {
    background: linear-gradient(135deg, #8e2de2, #4a00e0);
    color: white;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.gemini-logo {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.gemini-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.gemini-content {
    padding: 25px;
}

.gemini-content p {
    margin-bottom: 20px;
    color: var(--dark-color);
    font-size: 1.05rem;
    line-height: 1.6;
}

.gemini-features {
    margin-bottom: 25px;
    padding-left: 0;
    list-style: none;
}

.gemini-features li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.gemini-features i {
    color: #4a00e0;
    font-size: 1rem;
}

.gemini-cta {
    margin-top: 20px;
    text-align: center;
}

.gemini-cta .btn {
    padding: 12px 25px;
    font-size: 1.1rem;
    background: linear-gradient(135deg, #8e2de2, #4a00e0);
    border: none;
    box-shadow: 0 4px 15px rgba(74, 0, 224, 0.3);
    transition: all 0.3s ease;
}

.gemini-cta .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(74, 0, 224, 0.4);
}

.gemini-cta small {
    display: block;
    margin-top: 10px;
    color: var(--medium-gray);
}

/* Dark Mode Styling */
body.dark-theme .gemini-exercise-card {
    background: linear-gradient(135deg, #2d3748, #1a202c);
    border-color: #4a5568;
}

body.dark-theme .gemini-content p {
    color: #e2e8f0;
}

body.dark-theme .gemini-features i {
    color: #b794f4;
}

body.dark-theme .gemini-cta small {
    color: #a0aec0;
}

body.dark-theme .gemini-cta .btn {
    background: linear-gradient(135deg, #9f7aea, #6b46c1);
    box-shadow: 0 4px 15px rgba(159, 122, 234, 0.3);
}

body.dark-theme .gemini-cta .btn:hover {
    box-shadow: 0 6px 20px rgba(159, 122, 234, 0.4);
}

/* Perbaikan Mode Gelap - Kontras & Visibilitas */

/* Memperbaiki kontras partikel dalam mode gelap */
body.dark-theme .particle {
    color: #ffa374; /* Warna oranye lebih terang */
    background-color: rgba(255, 107, 53, 0.25);
    padding: 0 4px;
    border-radius: 4px;
    text-shadow: 0 0 1px rgba(0, 0, 0, 0.5); /* Meningkatkan keterbacaan */
}

/* Memperbaiki kontras grammar item dalam mode gelap */
body.dark-theme .grammar-item {
    color: #87bfff; /* Warna biru lebih terang */
    background-color: rgba(58, 134, 255, 0.25);
    padding: 0 4px;
    border-radius: 4px;
    text-shadow: 0 0 1px rgba(0, 0, 0, 0.5);
}

/* Memperbaiki teks Jepang dalam contoh kalimat */
body.dark-theme .japanese {
    color: #ffffff;
    font-weight: 700; /* Mempertebal untuk keterbacaan lebih baik */
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Memperbaiki romaji dalam mode gelap */
body.dark-theme .romaji {
    color: #d4d4d4; /* Warna abu-abu lebih terang */
    border-bottom: 1px dashed #666;
}

/* Styling untuk kana dalam mode gelap */
body.dark-theme .kana {
    color: #d4d4d4; /* Warna abu-abu lebih terang */
    font-weight: 500;
    border-bottom: 1px dashed #666;
}

/* Memperbaiki kontras terjemahan */
body.dark-theme .translation {
    color: #e6e6e6;
    font-weight: 600;
}

/* Memperbaiki teks dalam exercise */
body.dark-theme .exercise p,
body.dark-theme .exercise li {
    color: #e0e0e0;
}

/* Memperbaiki exercise example */
body.dark-theme .exercise-example {
    background-color: #3a3a3a;
    border-color: #5b8dee;
    color: #ffffff;
}

/* Memperbaiki teks dalam note */
body.dark-theme .note {
    background-color: rgba(255, 193, 7, 0.2);
    border-left: 5px solid #ffc107;
}

body.dark-theme .note h4 {
    color: #ffe082;
}

body.dark-theme .note li,
body.dark-theme .note p {
    color: #f0f0f0;
}

/* Memperbaiki kontras untuk grammar subsection */
body.dark-theme .grammar-subsection {
    background-color: #2d2d2d;
    border-left: 5px solid #7f94ff; /* Warna lebih terang */
}

body.dark-theme .grammar-subsection h3 {
    color: #a2c4ff; /* Biru lebih terang */
}

body.dark-theme .grammar-subsection p,
body.dark-theme .grammar-subsection li {
    color: #e0e0e0;
}

/* Memperbaiki warna teks dalam grammar component */
body.dark-theme .grammar-component {
    background-color: #2a2a2a;
    border: 1px solid #444;
}

body.dark-theme .grammar-component li,
body.dark-theme .grammar-component p {
    color: #e0e0e0;
}

/* Memperbaiki kontras untuk headers */
body.dark-theme .grammar-explanation h3,
body.dark-theme .examples h3 {
    color: #87bfff; /* Biru lebih terang */
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Memperbaiki bagian latihan */
body.dark-theme .practice-section {
    background-color: #1e1e1e;
    border-color: #333;
}

body.dark-theme .practice-section h2 {
    color: #87bfff;
}

body.dark-theme .practice-section p {
    color: #e0e0e0;
}

/* Memperbaiki japanese-word */
body.dark-theme .japanese-word {
    color: #ffca80;
    background-color: rgba(255, 202, 128, 0.15);
    padding: 0 4px;
    border-radius: 4px;
}
/* Theme Toggle */
.theme-toggle-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) 0;
}

.theme-label {
    color: var(--dark-gray);
    margin: 0 8px;
    font-size: 1.1rem;
}

.theme-toggle {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 30px;
}

.theme-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to right, var(--primary-light), var(--secondary-light));
    transition: .4s;
    border-radius: 34px;
}

.theme-slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .theme-slider {
    background: linear-gradient(to right, #2b2d42, #121420);
}

input:focus + .theme-slider {
    box-shadow: 0 0 1px var(--secondary-color);
}

input:checked + .theme-slider:before {
    transform: translateX(30px);
}

/* Dark Theme Styles */
body.dark-theme {
    background-color: #121212;
    color: #ffffff;
}

body.dark-theme .breadcrumbs {
    background-color: #1a1a1a;
    border-bottom: 1px solid #333;
}

body.dark-theme .breadcrumbs li:last-child {
    color: #aaa;
}

body.dark-theme .lesson-sidebar,
body.dark-theme .lesson-content {
    background-color: #1e1e1e;
    border-color: #333;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

body.dark-theme .sidebar-module {
    border-bottom: 1px solid #333;
}

body.dark-theme .sidebar-nav a {
    color: #f1f1f1;
}

body.dark-theme .sidebar-nav a:hover {
    background-color: #333;
    color: #ff8fa3; /* Warna primary-light */
}

body.dark-theme .resource-list a {
    background-color: rgba(67, 97, 238, 0.15);
    color: #7f94ff; /* Warna secondary-light */
}

body.dark-theme .resource-list a:hover {
    background-color: rgba(67, 97, 238, 0.3);
}

body.dark-theme .lesson-header::after {
    background: linear-gradient(90deg, var(--primary-color), transparent);
}

body.dark-theme .lesson-header h1 {
    color: #f1f1f1;
}

body.dark-theme .lesson-meta span {
    background-color: #333;
    color: #dddddd;
}

body.dark-theme .lesson-intro {
    background-color: #2a2a2a;
    border-left: 5px solid #ff4d6d;
    color: #f1f1f1;
}

body.dark-theme .grammar-point h2 {
    color: #f1f1f1;
}

body.dark-theme .grammar-component,
body.dark-theme .grammar-subsection {
    background-color: #2a2a2a;
}

body.dark-theme .grammar-component h4 {
    color: #f1f1f1;
}

body.dark-theme .example {
    background-color: rgba(58, 134, 255, 0.15);
    border-left: 5px solid #5b8dee;
}

body.dark-theme .japanese {
    color: #ffffff;
    font-weight: 500;
}

body.dark-theme .romaji {
    color: #bbbbbb;
    border-bottom: 1px dashed #555;
}

body.dark-theme .note {
    background-color: rgba(255, 193, 7, 0.15);
    border-left: 5px solid #ffc107;
}

body.dark-theme .note h4 {
    color: #ffd54f;
}

body.dark-theme .exercise {
    background-color: #2a2a2a;
    border-top: 4px solid #4361ee;
}

body.dark-theme .exercise-example {
    background-color: #3a3a3a;
    border-left: 3px solid #5b8dee;
    color: #e0e0e0;
}

body.dark-theme .progress-tracker {
    background-color: #2a2a2a;
    border: 1px solid #3a3a3a;
}

body.dark-theme .progress-bar {
    background-color: #3a3a3a;
}

/* Animation for theme transition */
body, .lesson-sidebar, .lesson-content, .breadcrumbs, .grammar-component, 
.example, .note, .grammar-subsection, .exercise, .progress-tracker, .sidebar-module,
.japanese, .romaji, .kana, .translation, .lesson-header h1 {
    transition: all 0.3s ease;
}


:root {
    /* Menggunakan variabel yang konsisten dengan tema utama */
    --primary-color: #ff4d6d;
    --primary-light: #ff8fa3;
    --primary-dark: #c9184a;
    --secondary-color: #4361ee;
    --secondary-light: #7f94ff;
    --secondary-dark: #2b4acb;
    
    /* Accent colors */
    --sakura: #ffb7c5;
    --matcha: #96ceb4;
    --wasabi: #c1d37f;
    --yuzu: #ffd166;
    
    /* Neutral & UI colors */
    --dark-color: #2b2d42;
    --dark-gray: #555b6e;
    --medium-gray: #8d99ae;
    --light-gray: #edf2f4;
    --white: #ffffff;
    --off-white: #f8f9fa;
    
    /* Semantic colors for grammar elements */
    --particle-color: #ff6b35;
    --grammar-item-color: #3a86ff;
    --note-bg: #fff3cd;
    --note-border: #ffc107;
    --example-bg: #e7f5ff;
    
    /* Spacing and UI properties */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 15px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Poppins', 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--off-white);
}

/* ---- Layout ---- */
.lesson-container {
    padding: 6rem 0 3rem; /* Increased top padding to accommodate fixed header */
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.lesson-wrapper {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 30px;
}

/* ---- Breadcrumbs ---- */
.breadcrumbs {
    background-color: var(--white);
    padding: 15px 0;
    border-bottom: 1px solid var(--light-gray);
    margin-bottom: var(--spacing-md);
}

.breadcrumbs ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
}

.breadcrumbs li {
    display: inline;
    font-size: 0.9rem;
}

.breadcrumbs li:not(:last-child)::after {
    content: "›";
    margin: 0 8px;
    color: var(--medium-gray);
}

.breadcrumbs a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.breadcrumbs a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.breadcrumbs li:last-child {
    color: var(--dark-gray);
    font-weight: 500;
}

/* ---- Sidebar ---- */
.lesson-sidebar {
    background: var(--white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow);
    position: sticky;
    top: 80px; /* Adjusted to account for header height */
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    transition: all 0.3s ease;
    border: 1px solid var(--light-gray);
}

.sidebar-module {
    padding: var(--spacing-md) var(--spacing-md);
    border-bottom: 1px solid var(--light-gray);
}

.sidebar-module:last-child {
    border-bottom: none;
}

.sidebar-module h3 {
    font-size: 1.1rem;
    margin-top: 0;
    margin-bottom: 15px;
    color: var(--dark-color);
    font-weight: 600;
    position: relative;
    padding-bottom: 8px;
}

.sidebar-module h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
}

.sidebar-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-nav li {
    margin-bottom: 8px;
}

.sidebar-nav a {
    text-decoration: none;
    color: var(--dark-color);
    display: block;
    padding: 10px 12px;
    border-radius: var(--border-radius-sm);
    transition: all 0.3s ease;
    font-size: 0.95rem;
    border: 1px solid transparent;
}

.sidebar-nav a:hover {
    background-color: var(--light-gray);
    color: var(--secondary-color);
    transform: translateX(3px);
}

.sidebar-nav li.active a {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(255, 77, 109, 0.25);
}

.resource-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.resource-list li {
    margin-bottom: 8px;
}

.resource-list a {
    text-decoration: none;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border-radius: var(--border-radius-sm);
    transition: all 0.3s ease;
    font-size: 0.95rem;
    background-color: rgba(67, 97, 238, 0.05);
}

.resource-list a:hover {
    background-color: rgba(67, 97, 238, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 3px 6px rgba(67, 97, 238, 0.15);
}

.resource-list i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
    color: var(--secondary-color);
}

/* ---- Lesson Content ---- */
.lesson-content {
    background: var(--white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow);
    padding: var(--spacing-xl);
    border: 1px solid var(--light-gray);
}

.lesson-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    position: relative;
}

.lesson-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, var(--primary-color), transparent);
}

.lesson-label {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 15px;
    box-shadow: 0 3px 6px rgba(255, 77, 109, 0.2);
}

.lesson-header h1 {
    margin: 10px 0 20px;
    font-size: 2.2rem;
    color: var(--dark-color);
    font-weight: 700;
    line-height: 1.2;
}

.lesson-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.lesson-meta span {
    display: flex;
    align-items: center;
    background-color: var(--light-gray);
    padding: 6px 12px;
    border-radius: 20px;
}

.lesson-meta i {
    margin-right: 6px;
    color: var(--secondary-color);
}

.lesson-intro {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
    color: var(--dark-color);
    background-color: var(--light-gray);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    border-left: 5px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

.lesson-intro::before {
    content: '';
    position: absolute;
    top: -30px;
    right: -30px;
    width: 100px;
    height: 100px;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text y=".9em" font-size="90" fill="rgba(255,77,109,0.05)">勉</text></svg>');
    background-size: contain;
    background-repeat: no-repeat;
    opacity: 0.5;
    transform: rotate(15deg);
}

/* ---- Grammar Points ---- */
.grammar-point {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--light-gray);
    position: relative;
}

.grammar-point:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.grammar-point h2 {
    font-size: 1.6rem;
    color: var(--dark-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: 12px;
    position: relative;
    display: inline-block;
}

.grammar-point h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.grammar-explanation h3,
.examples h3,
.grammar-subsection h3 {
    font-size: 1.3rem;
    margin: 25px 0 15px;
    color: var(--secondary-color);
    font-weight: 600;
}

.grammar-component {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--light-gray);
    border-radius: var(--border-radius-md);
    transition: transform 0.3s ease;
}

.grammar-component:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.grammar-component h4 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.1rem;
    color: var(--dark-color);
    display: flex;
    align-items: center;
}

.grammar-component h4::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--secondary-color);
    margin-right: 8px;
}

/* Japanese Text Styling */
.particle {
    color: var(--particle-color);
    font-weight: bold;
    transition: all 0.2s ease;
    font-size: 1.1em;
    padding: 0 2px;
}

.particle:hover {
    background-color: rgba(255, 107, 53, 0.1);
    border-radius: 3px;
}

.grammar-item {
    color: var(--grammar-item-color);
    font-weight: bold;
    transition: all 0.2s ease;
    padding: 0 2px;
}

.grammar-item:hover {
    background-color: rgba(58, 134, 255, 0.1);
    border-radius: 3px;
}

.japanese-word {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 500;
    letter-spacing: 0.03em;
}

/* Examples */
.examples {
    margin-top: var(--spacing-md);
}

.example {
    background-color: var(--example-bg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius-md);
    border-left: 5px solid var(--secondary-color);
    position: relative;
    transition: transform 0.3s ease;
}

.example:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(67, 97, 238, 0.15);
}

.japanese {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.3rem;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--dark-color);
    letter-spacing: 0.03em;
    line-height: 1.5;
}

.romaji {
    font-size: 0.95rem;
    color: var(--dark-gray);
    font-style: italic;
    margin-bottom: 8px;
    border-bottom: 1px dashed var(--medium-gray);
    padding-bottom: 6px;
}

.kana {
    font-size: 0.95rem;
    color: var(--dark-gray);
    margin-bottom: 8px;
    border-bottom: 1px dashed var(--medium-gray);
    padding-bottom: 6px;
    letter-spacing: 0.05em;
}

.translation {
    color: var(--dark-color);
    font-weight: 500;
    padding-top: 5px;
}

/* Audio button for examples */
.example-audio {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: rgba(67, 97, 238, 0.1);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--secondary-color);
    transition: all 0.2s ease;
}

.example-audio:hover {
    background-color: var(--secondary-color);
    color: white;
    transform: scale(1.1);
}

/* Notes */
.note {
    background-color: var(--note-bg);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    border-radius: var(--border-radius-md);
    border-left: 5px solid var(--note-border);
    position: relative;
}

.note::before {
    content: '\f0eb'; /* Lightbulb icon */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    top: -12px;
    left: 15px;
    background-color: var(--note-border);
    color: white;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
}

.note h4 {
    margin-top: 8px;
    margin-bottom: 10px;
    font-size: 1.1rem;
    color: var(--dark-color);
    padding-left: var(--spacing-sm);
}

/* Grammar Subsections */
.grammar-subsection {
    margin: 25px 0;
    padding: var(--spacing-md);
    background-color: var(--light-gray);
    border-radius: var(--border-radius-md);
    border-left: 5px solid var(--secondary-light);
}

/* Practice Section */
.practice-section {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--light-gray);
    position: relative;
    overflow: hidden;
}

.practice-section::before {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100px;
    height: 100px;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text y=".9em" font-size="90" fill="rgba(67,97,238,0.05)">練</text></svg>');
    background-size: contain;
    background-repeat: no-repeat;
    opacity: 0.5;
    transform: rotate(-15deg);
}

.practice-section h2 {
    margin-top: 0;
    color: var(--secondary-color);
    font-size: 1.6rem;
    margin-bottom: var(--spacing-md);
    position: relative;
    display: inline-block;
    padding-bottom: 8px;
}

.practice-section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--secondary-color), transparent);
    border-radius: 2px;
}

.practice-exercises {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.exercise {
    background-color: var(--light-gray);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    border-top: 4px solid var(--secondary-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.exercise:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.exercise h3 {
    margin-top: 0;
    font-size: 1.2rem;
    color: var(--dark-color);
    margin-bottom: var(--spacing-sm);
}

.exercise-example {
    background-color: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    margin-top: var(--spacing-sm);
    border-left: 3px solid var(--secondary-color);
}

/* Navigation */
.lesson-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--light-gray);
}

.prev-lesson, .next-lesson {
    padding: 12px 20px;
    border-radius: var(--border-radius-md);
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
    font-weight: 500;
}

.prev-lesson {
    color: var(--dark-color);
    background-color: var(--light-gray);
}

.prev-lesson:hover {
    background-color: #444;
    color: var(--white);
    transform: translateX(-5px);
}

.prev-lesson i {
    margin-right: 10px;
}

.next-lesson {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 6px rgba(255, 77, 109, 0.2);
}

.next-lesson:hover {
    box-shadow: 0 6px 12px rgba(255, 77, 109, 0.3);
    transform: translateX(5px);
}

.next-lesson i {
    margin-left: 10px;
}

/* Progress Tracker */
.progress-tracker {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--light-gray);
    border-radius: var(--border-radius-md);
    transition: all 0.3s ease;
}

.progress-tracker:hover {
    background-color: var(--white);
    box-shadow: var(--shadow);
}

.progress-tracker h3 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
    color: var(--dark-color);
}

.progress-bar {
    height: 10px;
    background-color: var(--white);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 5px;
    text-align: right;
    color: white;
    font-size: 0.8rem;
    line-height: 10px;
    padding-right: 5px;
    transition: width 0.5s ease;
}

.btn {
    display: inline-block;
    padding: 12px 20px;
    border-radius: var(--border-radius-md);
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 6px rgba(255, 77, 109, 0.2);
}

.btn-primary:hover {
    box-shadow: 0 6px 12px rgba(255, 77, 109, 0.3);
    transform: translateY(-3px);
}

#mark-complete {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

#mark-complete.completed {
    background: linear-gradient(135deg, #28a745, #1e7e34);
}

/* Notification for progress */
.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 15px 25px;
    border-radius: var(--border-radius-md);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    font-weight: 500;
}

.notification.show {
    transform: translateY(0);
    opacity: 1;
}

/* ---- Responsive Design ---- */
@media (max-width: 992px) {
    .lesson-wrapper {
        grid-template-columns: 1fr;
    }
    
    .lesson-sidebar {
        position: static;
        margin-bottom: var(--spacing-md);
        max-height: none;
    }
    
    .practice-exercises {
        grid-template-columns: 1fr;
    }
    
    .lesson-content {
        padding: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .lesson-container {
        padding-top: 5rem;
    }
    
    .lesson-header h1 {
        font-size: 1.8rem;
    }
    
    .lesson-meta {
        flex-direction: column;
        gap: 10px;
    }
    
    .example {
        padding: var(--spacing-sm);
    }
    
    .japanese {
        font-size: 1.2rem;
    }
    
    .grammar-point h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .breadcrumbs {
        padding: 10px 0;
    }
    
    .breadcrumbs li:not(:last-child) {
        display: none;
    }
    
    .breadcrumbs li:last-child::before {
        content: "«";
        margin-right: 8px;
        color: var(--medium-gray);
    }
    
    .lesson-header h1 {
        font-size: 1.5rem;
    }
    
    .lesson-label {
        font-size: 0.8rem;
        padding: 4px 12px;
    }
    
    .lesson-navigation {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .prev-lesson, .next-lesson {
        width: 100%;
        justify-content: center;
    }
    
    .grammar-component {
        padding: var(--spacing-sm);
    }
    
    .grammar-subsection {
        padding: var(--spacing-sm);
    }
    
    .practice-section {
        padding: var(--spacing-md);
    }
}

/* Smooth scrolling for anchor links */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px; /* Accounts for fixed header */
}

/* Print Styles */
@media print {
    .lesson-sidebar,
    .breadcrumbs,
    .lesson-navigation,
    .progress-tracker,
    #header-placeholder,
    #footer-placeholder {
        display: none;
    }
    
    .lesson-wrapper {
        display: block;
    }
    
    .lesson-content {
        box-shadow: none;
        padding: 0;
        border: none;
    }
    
    .grammar-component,
    .example,
    .note,
    .grammar-subsection {
        break-inside: avoid;
    }
    
    .lesson-container {
        padding-top: 0;
    }
}