/* Beat Watcher Website - Styles
   Dark, clinical health app design with red accent */

/* ==================== CSS Variables ==================== */
:root {
    --bg-dark: #111827;
    --bg-card: #1F2937;
    --accent: #EF4444;
    --accent-hover: #DC2626;
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.78);
    --text-muted: rgba(255, 255, 255, 0.5);
    --card-border: rgba(255, 255, 255, 0.08);
    --card-bg: rgba(255, 255, 255, 0.05);
    --max-width: 920px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ==================== Layout ==================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 72px 0;
}

/* ==================== Typography ==================== */
h1, h2, h3 {
    color: var(--text-primary);
    line-height: 1.25;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 16px;
}

h3 {
    font-size: 1.15rem;
    font-weight: 600;
}

/* ==================== Hero ==================== */
.hero {
    padding: 80px 0 56px;
}

.hero-layout {
    display: flex;
    align-items: center;
    gap: 48px;
}

.hero-text {
    flex: 1;
}

.hero-text h1 {
    margin-bottom: 20px;
}

.hero-text .subtitle {
    font-size: 1.15rem;
    margin-bottom: 32px;
    color: var(--text-secondary);
}

.hero-text .app-store-badge {
    display: inline-block;
}

.hero-text .app-store-badge img {
    height: 54px;
    width: auto;
}

.hero-image {
    flex: 0 0 auto;
}

.hero-image img {
    width: 260px;
    height: auto;
    filter: drop-shadow(0 12px 32px rgba(0, 0, 0, 0.4));
}

/* ==================== Trust Strip ==================== */
.trust-strip {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    padding: 24px 0;
    border-top: 1px solid var(--card-border);
    border-bottom: 1px solid var(--card-border);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.trust-item .icon {
    font-size: 1.1rem;
}

/* ==================== Testimonial ==================== */
.testimonial {
    padding: 56px 0;
}

.testimonial-card {
    background: var(--card-bg);
    border-left: 4px solid var(--accent);
    border-radius: 8px;
    padding: 32px 36px;
    max-width: 700px;
    margin: 0 auto;
}

.testimonial-card blockquote {
    font-size: 1.2rem;
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.6;
}

.testimonial-card .attribution {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.testimonial-card .disclaimer {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 12px;
    font-style: normal;
}

/* ==================== How It Works ==================== */
.how-it-works {
    text-align: center;
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 40px;
}

.step {
    text-align: center;
}

.step .step-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.step .step-number {
    display: inline-block;
    background: var(--accent);
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    font-size: 0.85rem;
    font-weight: 700;
    line-height: 28px;
    margin-bottom: 12px;
}

.step h3 {
    margin-bottom: 8px;
}

.step p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* ==================== Features ==================== */
.features {
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 28px 24px;
    text-align: left;
}

.feature-card .feature-icon {
    font-size: 1.6rem;
    margin-bottom: 12px;
}

.feature-card h3 {
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.55;
}

/* ==================== Use Cases ==================== */
.use-cases {
    text-align: center;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.use-case {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 28px 20px;
}

.use-case .use-case-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.use-case h3 {
    margin-bottom: 8px;
}

.use-case p {
    font-size: 0.92rem;
    color: var(--text-muted);
}

/* ==================== CTA Section ==================== */
.cta-section {
    text-align: center;
    padding: 56px 0;
}

.cta-section h2 {
    margin-bottom: 24px;
}

.cta-section .app-store-badge {
    display: inline-block;
}

.cta-section .app-store-badge img {
    height: 54px;
    width: auto;
}

/* ==================== FAQ ==================== */
.faq {
    max-width: 700px;
    margin: 0 auto;
}

.faq h2 {
    text-align: center;
    margin-bottom: 32px;
}

.faq-item {
    border-bottom: 1px solid var(--card-border);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    user-select: none;
}

.faq-question::after {
    content: "+";
    font-size: 1.4rem;
    color: var(--text-muted);
    transition: transform 0.2s ease;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item.open .faq-question::after {
    content: "\2212";
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.open .faq-answer {
    max-height: 300px;
    padding-bottom: 20px;
}

.faq-answer p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ==================== Footer ==================== */
footer {
    padding: 48px 0;
    border-top: 1px solid var(--card-border);
    text-align: center;
}

.footer-links {
    margin-bottom: 16px;
}

.footer-links a {
    color: var(--text-muted);
    margin: 0 12px;
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--text-primary);
}

.footer-legal {
    font-size: 0.8rem;
    color: var(--text-muted);
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.5;
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.4rem;
    }

    section {
        padding: 48px 0;
    }

    .hero {
        padding: 56px 0 40px;
    }

    .hero-layout {
        flex-direction: column;
        text-align: center;
    }

    .hero-image {
        flex: none;
        margin: 32px auto 0;
    }

    .hero-image img {
        width: 200px;
    }

    .steps {
        grid-template-columns: 1fr;
        gap: 24px;
    }

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

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

    .trust-strip {
        gap: 16px;
    }

    .testimonial-card {
        padding: 24px;
    }

    .testimonial-card blockquote {
        font-size: 1.05rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .trust-strip {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
}