/* ================================================
   QWERZY ONLINE SCHOOL - CORE THEME & STYLING
   Shared across all Grade 4-6 educational apps
   ================================================ */

:root {
    /* Ocean Explorer Theme - Primary */
    --ocean-deep: #0a1628;
    --ocean-mid: #1a3a5c;
    --ocean-light: #2d5a87;
    --ocean-surface: #4a90c2;
    --foam-white: #e8f4fc;
    
    /* Accent Colors */
    --sand-gold: #f4d35e;
    --coral-orange: #ff6b35;
    --seaweed-green: #2ecc71;
    --pearl-pink: #ff9ff3;
    
    /* Block Colors for Math */
    --block-blue: #3498db;
    --block-blue-dark: #2980b9;
    --block-green: #27ae60;
    --block-green-dark: #1e8449;
    --block-combined: #9b59b6;
    
    /* UI Feedback Colors */
    --input-border: #2d5a87;
    --input-focus: #f4d35e;
    --correct: #2ecc71;
    --incorrect: #e74c3c;
    
    /* Typography */
    --font-primary: 'Quicksand', sans-serif;
    --font-display: 'Fredoka One', cursive;
}

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

html, body {
    height: 100%;
    width: 100%;
}

body {
    background-image: url('/shared/assets/images/ocean-blue.jpg'), 
                      linear-gradient(180deg, var(--ocean-deep) 0%, var(--ocean-mid) 50%, var(--ocean-light) 100%);
    background-size: cover;
    background-attachment: fixed;
    background-repeat: no-repeat;
    min-height: 100vh;
    font-family: var(--font-primary);
    color: var(--foam-white);
    overflow-x: hidden;
}

.bubbles {
    position: fixed;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bubble {
    position: absolute;
    bottom: -50px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: rise 8s infinite ease-in;
}

@keyframes rise {
    0% { transform: translateY(0) scale(1); opacity: 0.6; }
    100% { transform: translateY(-100vh) scale(0.5); opacity: 0; }
}

.header {
    background: linear-gradient(135deg, var(--ocean-mid), var(--ocean-deep));
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 3px solid var(--sand-gold);
    position: relative;
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 2rem;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--sand-gold);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.grade-badge {
    background: var(--coral-orange);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
    color: white;
}

.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
    position: relative;
    z-index: 5;
}

.app-title {
    text-align: center;
    margin-bottom: 1.5rem;
}

.app-title h1 {
    font-family: var(--font-display);
    font-size: 2.2rem;
    color: var(--sand-gold);
    text-shadow: 3px 3px 6px rgba(0,0,0,0.4);
    margin-bottom: 0.5rem;
}

.app-title p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.tab-nav {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: var(--ocean-mid);
    border: 3px solid var(--ocean-light);
    color: var(--foam-white);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    background: var(--ocean-light);
    transform: translateY(-2px);
}

.tab-btn.active {
    background: var(--sand-gold);
    color: var(--ocean-deep);
    border-color: var(--coral-orange);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(244, 211, 94, 0.4);
}

.tab-icon {
    font-size: 1.2rem;
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    background: linear-gradient(135deg, rgba(26, 58, 92, 0.95), rgba(10, 22, 40, 0.95));
    border-radius: 20px;
    padding: 1.5rem;
    border: 3px solid var(--ocean-light);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.step-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.step-indicators {
    display: flex;
    gap: 0.5rem;
}

.step-dot {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--ocean-mid);
    border: 3px solid var(--ocean-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--foam-white);
}

.step-dot:hover {
    background: var(--ocean-light);
}

.step-dot.active {
    background: var(--sand-gold);
    color: var(--ocean-deep);
    border-color: var(--coral-orange);
    transform: scale(1.1);
}

.step-dot.completed {
    background: var(--seaweed-green);
    border-color: var(--seaweed-green);
    color: white;
}

.nav-buttons {
    display: flex;
    gap: 0.75rem;
}

.nav-btn {
    background: var(--ocean-light);
    border: 3px solid var(--ocean-surface);
    color: var(--foam-white);
    padding: 0.6rem 1.2rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn:hover:not(:disabled) {
    background: var(--sand-gold);
    color: var(--ocean-deep);
}

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

.step-panel {
    display: none;
}

.step-panel.active {
    display: block;
    animation: slideIn 0.4s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

.step-title {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--sand-gold);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.step-content {
    font-size: 1.1rem;
    line-height: 1.7;
}

.context-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.context-card {
    background: rgba(74, 144, 194, 0.3);
    border-radius: 15px;
    padding: 1rem;
    text-align: center;
    border: 2px solid var(--ocean-surface);
    transition: transform 0.3s ease;
}

.context-card:hover {
    transform: translateY(-5px);
}

.context-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.context-title {
    font-weight: 700;
    color: var(--sand-gold);
    margin-bottom: 0.25rem;
}

.activity-input,
.quiz-input {
    font-family: var(--font-primary);
    font-weight: 700;
    text-align: center;
    border: 4px solid var(--input-border);
    border-radius: 12px;
    background: rgba(255,255,255,0.95);
    color: var(--ocean-deep);
    transition: all 0.3s ease;
}

.activity-input:focus,
.quiz-input:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 20px rgba(244, 211, 94, 0.5);
    transform: scale(1.05);
}

.activity-input.correct,
.quiz-input.correct {
    border-color: var(--correct);
    background: rgba(46, 204, 113, 0.2);
}

.activity-input.incorrect,
.quiz-input.incorrect {
    border-color: var(--incorrect);
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.activity-input {
    width: 80px;
    height: 60px;
    font-size: 1.8rem;
}

.quiz-input {
    width: 70px;
    height: 55px;
    font-size: 1.6rem;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1rem 0;
    flex-wrap: wrap;
    justify-content: center;
}

.input-label {
    font-weight: 600;
    min-width: 100px;
}

.check-btn,
.animate-btn,
.submit-answer-btn,
.restart-quiz-btn {
    background: var(--coral-orange);
    border: none;
    color: white;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 700;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
}

.check-btn:hover,
.animate-btn:hover,
.submit-answer-btn:hover,
.restart-quiz-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(255, 107, 53, 0.5);
}

.new-problem-btn {
    background: var(--seaweed-green);
    border: none;
    color: white;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 700;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.new-problem-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(46, 204, 113, 0.4);
}

.next-question-btn {
    background: var(--seaweed-green);
    border: none;
    color: white;
    padding: 0.75rem 2rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 700;
    border-radius: 10px;
    cursor: pointer;
    margin-top: 1rem;
    display: none;
}

.next-question-btn.show {
    display: inline-block;
}

.feedback-message,
.quiz-feedback {
    text-align: center;
    font-size: 1.3rem;
    font-weight: 700;
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 10px;
    display: none;
}

.feedback-message.show,
.quiz-feedback.show {
    display: block;
}

.feedback-message.correct,
.quiz-feedback.correct {
    background: rgba(46, 204, 113, 0.3);
    color: var(--seaweed-green);
}

.feedback-message.incorrect,
.quiz-feedback.incorrect {
    background: rgba(231, 76, 60, 0.3);
    color: var(--incorrect);
}

.block-hundred {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    grid-template-rows: repeat(10, 1fr);
    gap: 1px;
    padding: 2px;
}

.block-hundred.blue { background: var(--block-blue); }
.block-hundred.green { background: var(--block-green); }
.block-hundred.combined { background: var(--block-combined); }

.block-hundred-cell {
    background: rgba(255,255,255,0.3);
    border-radius: 1px;
}

.block-ten {
    width: 50px;
    height: 12px;
    border-radius: 3px;
    display: flex;
    gap: 1px;
    padding: 1px;
}

.block-ten.blue { background: var(--block-blue); }
.block-ten.green { background: var(--block-green); }
.block-ten.combined { background: var(--block-combined); }

.block-ten-cell {
    flex: 1;
    background: rgba(255,255,255,0.3);
    border-radius: 1px;
}

.block-one {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

.block-one.blue { background: var(--block-blue); }
.block-one.green { background: var(--block-green); }
.block-one.combined { background: var(--block-combined); }

.ones-row {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
    justify-content: center;
    max-width: 60px;
}

.blocks-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
}

.blocks-display {
    display: flex;
    gap: 1rem;
    justify-content: center;
    padding: 1rem;
    background: rgba(0,0,0,0.2);
    border-radius: 15px;
    min-height: 150px;
}

.block-flash {
    animation: flash 0.3s ease 3;
}

@keyframes flash {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.block-merge {
    animation: merge 0.5s ease forwards;
}

@keyframes merge {
    0% { transform: scale(1); }
    50% { transform: scale(0.5); }
    100% { transform: scale(0); }
}

.block-appear {
    animation: appear 0.5s ease forwards;
}

@keyframes appear {
    0% { transform: scale(0); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.progress-bar {
    width: 200px;
    height: 20px;
    background: var(--ocean-mid);
    border-radius: 10px;
    overflow: hidden;
    border: 2px solid var(--ocean-light);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--seaweed-green), var(--sand-gold));
    transition: width 0.5s ease;
}

.score-display {
    background: var(--ocean-mid);
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    border: 3px solid var(--sand-gold);
}

.score-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

.score-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--sand-gold);
}

.stars {
    font-size: 3rem;
    margin: 1rem 0;
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .app-title h1 {
        font-size: 1.8rem;
    }

    .tab-btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    .step-dot {
        width: 35px;
        height: 35px;
        font-size: 0.9rem;
    }

    .activity-input {
        width: 65px;
        height: 50px;
        font-size: 1.5rem;
    }

    .quiz-input {
        width: 60px;
        height: 50px;
        font-size: 1.4rem;
    }

    .main-container {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 0.75rem 1rem;
    }

    .logo-text {
        font-size: 1.2rem;
    }

    .grade-badge {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }

    .app-title h1 {
        font-size: 1.5rem;
    }

    .tab-nav {
        gap: 0.25rem;
    }

    .tab-btn {
        padding: 0.5rem 0.8rem;
        font-size: 0.85rem;
    }

    .card {
        padding: 1rem;
    }
}