/* CSS Variables - ABU Brand Colors */
:root {
    --color-primary: #d97757;
    --color-primary-dark: #c46545;
    --color-primary-light: #e8917a;
    --color-background: #faf9f5;
    --color-background-alt: #f5f3ed;
    --color-text: #29261b;
    --color-text-light: #5a5549;
    --color-border: #e5e2d9;
    --color-white: #ffffff;
    --shadow-sm: 0 2px 8px rgba(41, 38, 27, 0.08);
    --shadow-md: 0 4px 16px rgba(41, 38, 27, 0.12);
    --shadow-lg: 0 8px 32px rgba(41, 38, 27, 0.16);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 80px 20px 60px;
    background: linear-gradient(180deg, var(--color-background) 0%, var(--color-background-alt) 100%);
}

.mascot-wrapper {
    position: relative;
    display: inline-block;
    margin-bottom: 24px;
}

.mascot {
    width: 180px;
    height: 180px;
    object-fit: cover;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    animation: float 3s ease-in-out infinite;
}

.beta-badge {
    position: absolute;
    top: 8px;
    right: -8px;
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a5a 100%);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(238, 90, 90, 0.4);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 16px;
    font-weight: 700;
}

.tagline {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.download-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
}

.btn .icon {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.version {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: 16px;
}

.disclaimer {
    font-size: 0.75rem;
    color: var(--color-text-light);
    opacity: 0.8;
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Features Section */
.features {
    padding: 80px 20px;
    background-color: var(--color-white);
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--color-text);
    margin-bottom: 48px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    background-color: var(--color-background);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.25rem;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* Screenshots Section */
.screenshots {
    padding: 80px 20px;
    background-color: var(--color-background-alt);
}

.screenshots h2 {
    font-size: 2rem;
    color: var(--color-text);
    margin-bottom: 12px;
    text-align: center;
}

.screenshot-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 8px 20px;
    border: 2px solid var(--color-border);
    background: var(--color-white);
    border-radius: 24px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-light);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.tab-btn:hover {
    border-color: var(--color-primary-light);
    color: var(--color-primary);
}

.tab-btn.active {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.screenshot-viewer {
    max-width: 960px;
    margin: 0 auto;
}

.screenshot-item {
    display: none;
    text-align: center;
    animation: fadeIn 0.35s ease;
}

.screenshot-item.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.screenshot-item img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 3px solid var(--color-white);
}

.screenshot-caption {
    margin-top: 16px;
    font-size: 0.95rem;
    color: var(--color-text-light);
}

/* Section Common */
.section-desc {
    color: var(--color-text-light);
    margin-bottom: 40px;
    text-align: center;
}

/* Use Cases Section */
.use-cases {
    padding: 80px 20px;
    background-color: var(--color-background-alt);
}

.use-cases h2 {
    font-size: 2rem;
    color: var(--color-text);
    margin-bottom: 12px;
    text-align: center;
}

.use-case-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.use-case-card {
    background-color: var(--color-white);
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.use-case-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.use-case-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.use-case-icon {
    font-size: 1.75rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    border-radius: var(--radius-md);
}

.use-case-card h3 {
    font-size: 1.1rem;
    color: var(--color-text);
    font-weight: 600;
}

.use-case-examples {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.example-item {
    font-size: 0.875rem;
    color: var(--color-text-light);
    padding: 10px 12px;
    background-color: var(--color-background);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-primary);
    line-height: 1.5;
}

/* Rating Section */
.rating {
    padding: 80px 20px;
    background-color: var(--color-white);
}

.rating h2 {
    font-size: 2rem;
    color: var(--color-text);
    margin-bottom: 12px;
    text-align: center;
}

.rating-wrapper {
    display: flex;
    gap: 40px;
    align-items: stretch;
    justify-content: center;
    max-width: 800px;
    margin: 0 auto;
}

.rating-summary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: 32px 40px;
    border-radius: var(--radius-lg);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 180px;
}

.score-badge {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 2px;
}

.score-number {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
}

.score-total {
    font-size: 1.25rem;
    opacity: 0.8;
}

.rating-summary .stars {
    font-size: 1.25rem;
    margin: 12px 0 8px;
    letter-spacing: 2px;
    color: #ffd700;
}

.rating-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

.reviews-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.review-item {
    background-color: var(--color-background);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.review-item:hover {
    box-shadow: var(--shadow-sm);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.reviewer-avatar {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-white);
    border-radius: 50%;
}

.reviewer-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.reviewer-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
}

.review-stars {
    font-size: 0.75rem;
    color: #ffc107;
    letter-spacing: 1px;
}

.review-content {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
    margin: 0;
}

/* Feedback Section */
.feedback {
    padding: 80px 20px;
    background-color: var(--color-white);
    text-align: center;
}

.feedback h2 {
    font-size: 2rem;
    color: var(--color-text);
    margin-bottom: 16px;
}

.feedback > .container > p {
    color: var(--color-text-light);
    margin-bottom: 32px;
}

.qrcode-wrapper {
    margin-bottom: 24px;
}

.qrcode {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 4px solid var(--color-white);
    outline: 2px solid var(--color-border);
}

.qrcode-placeholder {
    width: 200px;
    height: 200px;
    margin: 0 auto;
    background-color: var(--color-background-alt);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.feedback-note {
    font-size: 0.95rem;
    color: var(--color-text-light);
}

/* Footer */
.footer {
    background-color: var(--color-text);
    color: var(--color-background);
    padding: 32px 20px;
}

.footer-content {
    text-align: center;
}

.footer-content p {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(41, 38, 27, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 40px 48px;
    text-align: center;
    position: relative;
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    width: 90%;
    animation: modalIn 0.25s ease-out;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.92) translateY(12px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-light);
    cursor: pointer;
    line-height: 1;
    padding: 4px;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--color-text);
}

.modal-content h3 {
    font-size: 1.35rem;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.modal-content > p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 24px;
}

.modal-qrcode {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 4px solid var(--color-background);
    margin-bottom: 16px;
}

.modal-hint {
    font-size: 0.8rem;
    color: var(--color-text-light);
    opacity: 0.8;
}

/* button reset for download buttons */
button.btn {
    border: none;
    font-family: inherit;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding: 60px 20px 40px;
    }

    .mascot {
        width: 140px;
        height: 140px;
    }

    .hero h1 {
        font-size: 1.875rem;
    }

    .tagline {
        font-size: 1.1rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.95rem;
    }

    .features, .screenshots, .use-cases, .rating, .feedback {
        padding: 60px 20px;
    }

    .features h2, .screenshots h2, .use-cases h2, .rating h2, .feedback h2 {
        font-size: 1.5rem;
    }

    .screenshot-tabs {
        gap: 6px;
    }

    .tab-btn {
        padding: 6px 14px;
        font-size: 0.8rem;
    }

    .screenshot-viewer {
        margin: 0 -10px;
    }

    .screenshot-item img {
        border-radius: var(--radius-md);
    }

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

    .use-case-grid {
        grid-template-columns: 1fr;
    }

    .rating-wrapper {
        flex-direction: column;
        align-items: center;
    }

    .rating-summary {
        width: 100%;
        max-width: 300px;
    }

    .reviews-list {
        width: 100%;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .screenshot-tabs {
        gap: 4px;
    }

    .tab-btn {
        padding: 5px 10px;
        font-size: 0.75rem;
        border-width: 1.5px;
    }

    .screenshot-viewer {
        margin: 0 -16px;
    }

    .screenshot-caption {
        font-size: 0.85rem;
        padding: 0 16px;
    }
}