/* ===========================
   Global Styles
   =========================== */

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

body {
    font-family: 'Comic Sans MS', 'Arial Rounded MT Bold', cursive, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

/* ===========================
   Header
   =========================== */

header {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 40px 20px;
    text-align: center;
}

header h1 {
    font-size: 3em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.3em;
    opacity: 0.95;
}

/* ===========================
   Navigation
   =========================== */

.main-nav {
    background: #4facfe;
    background: linear-gradient(90deg, #4facfe 0%, #00f2fe 100%);
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    padding: 10px;
    gap: 10px;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 15px 30px;
    border-radius: 25px;
    font-size: 1.1em;
    font-weight: bold;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.2);
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
}

.nav-link.active {
    background: white;
    color: #4facfe;
}

/* ===========================
   Main Content
   =========================== */

main {
    padding: 40px 20px;
}

.welcome-section {
    text-align: center;
    margin-bottom: 40px;
}

.welcome-section h2 {
    color: #f5576c;
    font-size: 2.5em;
    margin-bottom: 15px;
}

.welcome-section p {
    font-size: 1.3em;
    color: #666;
}

/* ===========================
   Activity Cards
   =========================== */

.activity-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.activity-card {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.activity-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.card-icon {
    font-size: 4em;
    margin-bottom: 15px;
}

.activity-card h3 {
    color: #764ba2;
    font-size: 1.8em;
    margin-bottom: 15px;
}

.activity-card p {
    color: #555;
    font-size: 1.1em;
    margin-bottom: 20px;
    line-height: 1.5;
}

/* ===========================
   Buttons
   =========================== */

.btn {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 35px;
    border-radius: 30px;
    text-decoration: none;
    font-size: 1.2em;
    font-weight: bold;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.btn:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.btn-small {
    padding: 10px 20px;
    font-size: 1em;
}

/* ===========================
   Alphabet Display
   =========================== */

.alphabet-display {
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
}

.alphabet-display h3 {
    color: #764ba2;
    font-size: 2em;
    margin-bottom: 20px;
}

.alphabet-letters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.letter {
    background: white;
    color: #667eea;
    font-size: 2em;
    font-weight: bold;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 15px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
}

.letter:hover {
    transform: scale(1.2) rotate(5deg);
    background: #667eea;
    color: white;
}

/* ===========================
   Letter Grid (Identification Page)
   =========================== */

.game-section {
    max-width: 1000px;
    margin: 0 auto;
}

.game-section h2 {
    color: #f5576c;
    font-size: 2.3em;
    text-align: center;
    margin-bottom: 15px;
}

.instruction {
    text-align: center;
    font-size: 1.2em;
    color: #666;
    margin-bottom: 30px;
}

.letter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 15px;
    margin-bottom: 40px;
}

.letter-btn {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    border: none;
    font-size: 2.5em;
    font-weight: bold;
    color: #764ba2;
    padding: 20px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.letter-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

.letter-btn:active {
    transform: scale(0.95);
}

/* ===========================
   Letter Display Card
   =========================== */

.letter-display {
    margin-bottom: 50px;
}

.display-card {
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.display-card h3 {
    color: #764ba2;
    font-size: 1.8em;
    margin-bottom: 20px;
}

.letter-showcase {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 30px 0;
    flex-wrap: wrap;
}

.letter-box {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    min-width: 150px;
}

.letter-box p {
    color: #666;
    font-size: 1.2em;
    margin-bottom: 10px;
}

.letter-big {
    font-size: 5em;
    font-weight: bold;
    color: #667eea;
}

/* ===========================
   Matching Game
   =========================== */

.matching-game {
    background: linear-gradient(135deg, #e0c3fc 0%, #8ec5fc 100%);
    border-radius: 20px;
    padding: 30px;
    margin-top: 40px;
}

.matching-game h3 {
    color: #764ba2;
    font-size: 2em;
    text-align: center;
    margin-bottom: 15px;
}

.score-board {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    padding: 15px 25px;
    border-radius: 15px;
    margin-bottom: 20px;
    font-size: 1.3em;
    font-weight: bold;
    color: #764ba2;
}

.match-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.match-column {
    background: rgba(255, 255, 255, 0.5);
    border-radius: 15px;
    padding: 20px;
}

.match-column h4 {
    text-align: center;
    color: #764ba2;
    font-size: 1.5em;
    margin-bottom: 15px;
}

.match-letters {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.match-btn {
    background: white;
    border: 3px solid transparent;
    font-size: 2em;
    font-weight: bold;
    color: #667eea;
    padding: 15px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
}

.match-btn:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 12px rgba(0, 0, 0, 0.2);
}

.match-btn.selected {
    border-color: #f5576c;
    background: #fff5f7;
    transform: scale(1.05);
}

.match-btn.matched {
    background: #90EE90;
    color: white;
    pointer-events: none;
    opacity: 0.7;
}

/* ===========================
   Feedback Messages
   =========================== */

.feedback {
    text-align: center;
    padding: 20px;
    border-radius: 15px;
    font-size: 1.5em;
    font-weight: bold;
    margin-top: 20px;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feedback.correct {
    background: #90EE90;
    color: white;
}

.feedback.incorrect {
    background: #FFB6C1;
    color: white;
}

/* ===========================
   Sequence Page
   =========================== */

.sequence-section {
    max-width: 1000px;
    margin: 0 auto;
}

.sequence-section h2 {
    color: #f5576c;
    font-size: 2.3em;
    text-align: center;
    margin-bottom: 30px;
}

.alphabet-reference {
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    border-radius: 20px;
    padding: 25px;
    text-align: center;
    margin-bottom: 40px;
}

.alphabet-reference h3 {
    color: #764ba2;
    font-size: 1.8em;
    margin-bottom: 15px;
}

.alphabet-line {
    font-size: 1.8em;
    font-weight: bold;
    color: #667eea;
    letter-spacing: 8px;
    word-spacing: 5px;
}

.game-box {
    background: linear-gradient(135deg, #e0c3fc 0%, #8ec5fc 100%);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
}

.game-box h3 {
    color: #764ba2;
    font-size: 2em;
    text-align: center;
    margin-bottom: 10px;
}

.sequence-display {
    background: white;
    border-radius: 15px;
    padding: 30px;
    margin: 20px 0;
    text-align: center;
}

.sequence-letters {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.sequence-letter {
    background: #667eea;
    color: white;
    font-size: 2.5em;
    font-weight: bold;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.sequence-blank {
    background: white;
    border: 3px dashed #667eea;
    color: #667eea;
}

.answer-options {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.option-btn {
    background: white;
    border: 3px solid #667eea;
    font-size: 2.2em;
    font-weight: bold;
    color: #667eea;
    width: 70px;
    height: 70px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
}

.option-btn:hover {
    transform: scale(1.1);
    background: #667eea;
    color: white;
}

.option-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===========================
   Sorting Game
   =========================== */

.sorting-area {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.sort-btn {
    background: white;
    border: 3px solid #667eea;
    font-size: 2.2em;
    font-weight: bold;
    color: #667eea;
    width: 70px;
    height: 70px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
}

.sort-btn:hover:not(:disabled) {
    transform: scale(1.1);
    background: #667eea;
    color: white;
}

.sort-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.sorted-display {
    background: white;
    border-radius: 15px;
    padding: 20px;
    margin: 20px 0;
    text-align: center;
    font-size: 1.3em;
    min-height: 60px;
}

.sorted-letters {
    font-weight: bold;
    color: #667eea;
    font-size: 1.5em;
    letter-spacing: 10px;
}

/* ===========================
   Before/After Game
   =========================== */

.before-after-question {
    background: white;
    border-radius: 15px;
    padding: 30px;
    margin: 20px 0;
    text-align: center;
}

.question-text {
    font-size: 1.8em;
    color: #764ba2;
    margin-bottom: 20px;
}

.question-letter {
    font-size: 4em;
    font-weight: bold;
    color: #667eea;
    margin: 20px 0;
}

/* ===========================
   Videos Page
   =========================== */

.videos-section {
    max-width: 1100px;
    margin: 0 auto;
}

.videos-section h2 {
    color: #f5576c;
    font-size: 2.5em;
    text-align: center;
    margin-bottom: 15px;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.video-card {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    border-radius: 15px;
    margin-bottom: 15px;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-card h3 {
    color: #764ba2;
    font-size: 1.5em;
    margin-bottom: 10px;
}

.video-card p {
    color: #555;
    font-size: 1.1em;
    line-height: 1.5;
}

/* ===========================
   Tips Box
   =========================== */

.tips-box {
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    border-radius: 20px;
    padding: 30px;
    margin-top: 30px;
}

.tips-box h3 {
    color: #764ba2;
    font-size: 2em;
    margin-bottom: 20px;
    text-align: center;
}

.tips-box ul {
    list-style: none;
    padding: 0;
}

.tips-box li {
    background: white;
    padding: 15px 20px;
    margin-bottom: 10px;
    border-radius: 15px;
    font-size: 1.2em;
    color: #555;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
}

.tips-box li:before {
    content: "✓ ";
    color: #90EE90;
    font-weight: bold;
    font-size: 1.3em;
    margin-right: 10px;
}

/* ===========================
   Footer
   =========================== */

footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 25px;
    font-size: 1.1em;
}

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }

    .subtitle {
        font-size: 1.1em;
    }

    .nav-link {
        padding: 12px 20px;
        font-size: 1em;
    }

    .activity-grid {
        grid-template-columns: 1fr;
    }

    .match-container {
        grid-template-columns: 1fr;
    }

    .letter {
        width: 50px;
        height: 50px;
        font-size: 1.5em;
    }

    .alphabet-line {
        font-size: 1.2em;
        letter-spacing: 3px;
    }

    .video-grid {
        grid-template-columns: 1fr;
    }
}