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

:root {
    --color-primary: #2d7a3a;
    --color-primary-dark: #1f5a2a;
    --color-text: #1a1a1a;
    --color-text-secondary: #555;
    --color-bg: #fafafa;
    --color-white: #fff;
    --color-border: #e0e0e0;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --max-width: 960px;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-stack);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

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

a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

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

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

/* ===== Header / Nav ===== */
.site-header {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.site-logo:hover {
    text-decoration: none;
}

.site-nav {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

.site-nav a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}

.site-nav a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

/* ===== Hero ===== */
.hero {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.hero .tagline {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

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

.app-store-badge img {
    height: 54px;
}

/* ===== Features ===== */
.features {
    padding: var(--spacing-xl) 0;
}

.features h2 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: var(--spacing-lg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-md);
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* ===== Page Content (FAQ, Privacy) ===== */
.page-content {
    padding: var(--spacing-lg) 0 var(--spacing-xl);
}

.page-content h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.page-content h2 {
    font-size: 1.3rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.page-content p {
    margin-bottom: var(--spacing-sm);
}

.page-content ul {
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-md);
}

.page-content li {
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
}

/* ===== FAQ Accordion ===== */
.faq-section {
    margin-bottom: var(--spacing-lg);
}

.faq-section h2 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
}

.faq-item {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    margin-bottom: var(--spacing-xs);
    background: var(--color-white);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    text-align: left;
    padding: var(--spacing-sm) var(--spacing-md);
    background: none;
    border: none;
    font-family: var(--font-stack);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question:hover {
    background: var(--color-bg);
}

.faq-question::after {
    content: "+";
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    transition: transform 0.2s;
}

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

.faq-answer {
    display: none;
    padding: 0 var(--spacing-md) var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.faq-item.open .faq-answer {
    display: block;
}

/* ===== Footer ===== */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    list-style: none;
    margin-bottom: var(--spacing-sm);
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .hero .tagline {
        font-size: 1rem;
    }

    .features h2 {
        font-size: 1.4rem;
    }

    .site-nav {
        gap: var(--spacing-sm);
    }
}