/* /assets/css/style.css */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Ramabhadra&display=swap');

:root {
    --primary-color: #f03b0f;
    --primary-color-dark: #d9360e;
    --header-bg: #fff;
    --body-bg: #f4f7f9;
    --card-bg: #ffffff;
    --text-color: #333;
    --border-color: #dee2e6;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 25px rgba(0,0,0,0.1);
    --border-radius: 0.75rem;
    --transition-speed: 0.25s;
    --completed-color: #2a9d8f;

    /* Color Palette for Class Titles */
    --class-color-1: #0077b6;
    --class-color-2: #00b4d8;
    --class-color-3: #2a9d8f;
    --class-color-4: #e76f51;
    --class-color-5: #f4a261;
}

*, *::before, *::after { box-sizing: border-box; }

body { margin: 0; font-family: 'Poppins', 'Inter', Arial, sans-serif; display: flex; flex-direction: column; height: 100vh; background-color: var(--body-bg); color: var(--text-color); }
#app { display: flex; flex-direction: column; flex-grow: 1; overflow: hidden; }

.header { background-color: var(--header-bg); padding: 0.75rem 1.5rem; display: flex; align-items: center; justify-content: space-between; box-shadow: var(--shadow-sm); z-index: 100; border-bottom: 1px solid var(--border-color); flex-shrink: 0; }
.logo img { height: 3.25rem; width: auto; border-radius: 0.5rem; }
.navbar { display: flex; align-items: center; gap: 1rem; }
.navbar a { color: var(--primary-color); padding: 0.5rem 1rem; text-decoration: none; border-radius: 999px; transition: all var(--transition-speed) ease; background-color: transparent; border: 2px solid transparent; cursor: pointer; font-size: 1rem; font-weight: 600; display: inline-flex; align-items: center; justify-content: center; }
.navbar a:hover { background-color: var(--primary-color); color: white; transform: translateY(-2px); }
.nav-icon { width: 3.25rem; height: 3.25rem; padding: 0; }
.nav-icon svg { width: 1.75rem; height: 1.75rem; }
.navbar a:hover svg { stroke: white; }

.main-content-area { flex-grow: 1; padding: 1rem; overflow-y: auto; transition: opacity var(--transition-speed) ease; }
.main-content-area.fade-out { opacity: 0; }
.page-section { max-width: 1600px; margin: 0 auto; }
.section-title { font-size: clamp(1.5rem, 4vw, 2.25rem); font-weight: 700; color: var(--text-color); text-align: center; margin-bottom: 1.5rem; }
.section-title span { color: var(--primary-color); }

/* --- Base/Mobile First Home Page Layout --- */
.class-container-wrapper {
    display: flex;
    flex-direction: column; /* Stack cards vertically on mobile */
    gap: 1.5rem;
}

.class-section-card {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    transition: all var(--transition-speed) ease;
    color: #ffffff;
}

.class-title {
    text-align: center;
    font-size: 1.6rem;
    font-weight: 700;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    padding: 0 1rem;
    color: #ffffff;
}

/* Dynamic Class BACKGROUND Colors */
.class-container-wrapper .class-section-card:nth-of-type(5n + 1) { background-color: var(--class-color-1); }
.class-container-wrapper .class-section-card:nth-of-type(5n + 2) { background-color: var(--class-color-2); }
.class-container-wrapper .class-section-card:nth-of-type(5n + 3) { background-color: var(--class-color-3); }
.class-container-wrapper .class-section-card:nth-of-type(5n + 4) { background-color: var(--class-color-4); }
.class-container-wrapper .class-section-card:nth-of-type(5n + 5) { background-color: var(--class-color-5); }

/* --- MODIFIED: Subject buckets are two-column on mobile --- */
.subject-buckets-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* Default to 2 columns */
    gap: 1rem;
    padding: 0 1rem 1rem 1rem;
    flex-grow: 1;
}

/* Subject Bucket Styles for White Background */
.class-section-card .bucket-card {
    background: var(--card-bg);
    padding: 1rem;
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    border: 1px solid transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-width: 0; /* CRITICAL FIX: Allows buckets to shrink properly in a flex/grid context */
}
.class-section-card .bucket-card:hover {
    transform: scale(1.05);
    background: var(--primary-color);
    border-color: var(--primary-color);
}
.class-section-card .bucket-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    transition: color var(--transition-speed) ease;
}
.class-section-card .bucket-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    transition: color var(--transition-speed) ease;
    word-break: break-word; /* CRITICAL FIX: Prevents long text from breaking layout */
}
.class-section-card .bucket-card:hover .bucket-icon,
.class-section-card .bucket-card:hover .bucket-text {
    color: #ffffff;
}

/* Base/Mobile First Lesson Selector */
.lesson-grid {
    display: grid;
    grid-template-columns: 1fr; /* Single column on mobile */
    gap: 1rem;
}

.lesson-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    box-shadow: var(--shadow-sm);
}

.lesson-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

/* --- REMOVED .lesson-number rule --- */

.lesson-details { flex-grow: 1; }
.lesson-name { font-size: 1.5rem; font-weight: 600; color: var(--text-color); }
.lesson-status-icon { font-size: 1.5rem; width: 28px; height: 28px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; }
.lesson-card.completed { background-color: #f8fefd; border-left: 5px solid var(--completed-color); }

/* --- REMOVED .lesson-card.completed .lesson-number rule --- */

.lesson-card.completed .lesson-status-icon::after { content: '✅'; }

/* --- Tablet Styles --- */
@media (min-width: 768px) {
    .main-content-area { padding: 1.5rem; }
    .section-title { margin-bottom: 2rem; }
    
    /* Arrange class cards in a wrapping grid */
    .class-container-wrapper {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
    .class-section-card {
        flex-grow: 1;
        flex-basis: 340px;
    }

    /* Arrange lessons in a responsive grid */
    .lesson-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 1.5rem;
    }
}

/* --- Desktop Styles --- */
@media (min-width: 1024px) {
    /* Arrange class cards in a single dynamic row */
    .class-container-wrapper {
        flex-wrap: nowrap;
    }
    .class-section-card {
        flex: 1;
        min-width: 0;
    }
    .class-section-card:hover {
        transform: translateY(-5px) scale(1.02);
        z-index: 10;
    }
}

.empty-state-card { grid-column: 1 / -1; text-align: center; padding: 3rem 1.5rem; background-color: #e9ecef; border-radius: var(--border-radius); border: 2px dashed var(--border-color); }
.iframe-wrapper { flex-grow: 1; display: none; flex-direction: column; }
.iframe-wrapper.visible { display: flex; }
.iframe-container { width: 100%; max-width: 1200px; margin: 0 auto; border: 1px solid var(--border-color); border-radius: var(--border-radius); box-shadow: var(--shadow-md); overflow: hidden; flex-grow: 1; display: flex; }
iframe { width: 100%; height: 100%; display: block; border: none; }
.iframe-controls { display: none; position: fixed; bottom: 1.5rem; left: 1.5rem; right: 1.5rem; width: auto; justify-content: space-between; z-index: 200; pointer-events: none; }
.iframe-wrapper.visible + .iframe-controls { display: flex; }
.iframe-controls button { pointer-events: auto; width: 3.5rem; height: 3.5rem; border-radius: 50%; font-size: 1.5rem; cursor: pointer; border: none; background-color: var(--primary-color); color: white; display: flex; align-items: center; justify-content: center; transition: all var(--transition-speed) ease; box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.iframe-controls button:hover { background-color: var(--primary-color-dark); transform: scale(1.05); }
.iframe-controls button:disabled { background-color: #ccc; cursor: not-allowed; transform: none; box-shadow: none; }
.initial-loader { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 50vh; gap: 1rem; color: var(--text-light); }
.initial-loader .spinner { width: 40px; height: 40px; border: 4px solid var(--border-color); border-top-color: var(--primary-color); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.flash-news-container { background-color: #2c3e50; color: #ecf0f1; padding: 0.6rem 0; overflow: hidden; white-space: nowrap; flex-shrink: 0; }
.flash-news-content { display: inline-block; padding-left: 100%; animation: scroll-left 25s linear infinite; font-weight: 500; font-size: 0.9rem; }
@keyframes scroll-left { 0% { transform: translateX(0); } 100% { transform: translateX(-100%); } }
.completion-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.6); display: flex; align-items: center; justify-content: center; z-index: 1000; opacity: 0; visibility: hidden; transition: opacity 0.3s ease, visibility 0.3s ease; }
.completion-overlay.visible { opacity: 1; visibility: visible; }
.completion-modal { background-color: white; padding: 2.5rem; border-radius: var(--border-radius); text-align: center; max-width: 400px; width: 90%; box-shadow: var(--shadow-lg); transform: scale(0.9); transition: transform 0.3s ease; }
.completion-overlay.visible .completion-modal { transform: scale(1); }
.completion-modal .icon { font-size: 4rem; margin-bottom: 1rem; }
.completion-modal h2 { font-size: 2rem; margin: 0 0 0.5rem 0; color: var(--text-color); }
.completion-modal p { margin: 0 0 1.5rem 0; font-size: 1rem; color: #666; }
.completion-modal .actions .back-btn { background-color: var(--primary-color); color: white; border: none; padding: 0.75rem 1.5rem; border-radius: 999px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background-color var(--transition-speed) ease; }
.completion-modal .actions .back-btn:hover { background-color: var(--primary-color-dark); }

/* --- NEW STYLES FOR WELCOME BANNER --- */
.welcome-banner {
    background-color: #9200fd;
    color: #ffffff;
    padding: 0rem;
    border-radius: var(--border-radius);
    text-align: center;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-md);
}

.welcome-banner h2 {
    margin: 0 0 0.5rem 0;
    font-size: clamp(1.8rem, 5vw, 2.5rem);
    font-weight: 700;
}

.welcome-banner p {
    margin: 0;
    font-size: clamp(1rem, 3vw, 1.2rem);
    font-weight: 400;
    opacity: 0.9;
}

/* --- NEW STYLES FOR TELUGU FONT --- */
[data-subject="Telugu"] .bucket-text,
.lesson-card[data-subject="Telugu"] .lesson-name {
    font-family: 'Ramabhadra', sans-serif;
}