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

:root {
    --color-bg: #fafaf8;
    --color-surface: #ffffff;
    --color-text: #1a1a2e;
    --color-text-muted: #555568;
    --color-primary: #4a3f8a;
    --color-primary-hover: #3b3270;
    --color-secondary: #e8e6f0;
    --color-secondary-hover: #d8d5e5;
    --color-border: #e0dfe6;
    --color-success: #2e7d4f;
    --color-success-bg: #edf7f0;
    --color-error: #c0392b;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
    --max-width: 960px;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ── Header ─────────────────────────────────────────── */
.site-header {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 3.5rem;
}

.logo {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.15s;
}

.nav-link:hover {
    color: var(--color-primary);
}

/* ── Hero ────────────────────────────────────────────── */
.hero {
    padding: 5rem 0 4rem;
    text-align: center;
}

.hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
    color: var(--color-text);
}

.hero-subtitle {
    margin-top: 1.25rem;
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

/* ── Buttons ─────────────────────────────────────────── */
.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: 8px;
    transition: background 0.15s, transform 0.1s;
    cursor: pointer;
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

.btn-secondary:hover {
    background: var(--color-secondary-hover);
}

/* ── Product Section ─────────────────────────────────── */
.product {
    padding: 4rem 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.section-heading {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    text-align: center;
    margin-bottom: 0.75rem;
}

.section-intro {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    text-align: center;
    max-width: 560px;
    margin: 0 auto 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.feature h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.feature p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

/* ── Beta Signup ─────────────────────────────────────── */
.beta-signup {
    padding: 4rem 0;
}

.beta-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 3rem 2.5rem;
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.beta-card h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.beta-card > p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 1.75rem;
    line-height: 1.6;
}

.beta-form .form-row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.beta-form input {
    flex: 1;
    min-width: 160px;
    padding: 0.7rem 1rem;
    font-size: 0.95rem;
    font-family: var(--font-sans);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-bg);
    color: var(--color-text);
    outline: none;
    transition: border-color 0.15s;
}

.beta-form input:focus {
    border-color: var(--color-primary);
}

.beta-form input::placeholder {
    color: #999;
}

.beta-form .btn {
    white-space: nowrap;
}

.form-error {
    color: var(--color-error);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.success-message {
    background: var(--color-success-bg);
    border: 1px solid var(--color-success);
    border-radius: 8px;
    padding: 1rem 1.5rem;
}

.success-message p {
    color: var(--color-success);
    font-weight: 500;
    font-size: 0.95rem;
}

/* ── Clinicians ──────────────────────────────────────── */
.clinicians {
    padding: 4rem 0;
    border-top: 1px solid var(--color-border);
}

.clinician-card {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.clinician-card h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.clinician-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.65;
    margin-bottom: 1.5rem;
}

/* ── Footer ──────────────────────────────────────────── */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    text-align: center;
}

.site-footer p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 768px) {
    .hero {
        padding: 3.5rem 0 3rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.05rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .beta-card {
        padding: 2rem 1.5rem;
    }

    .beta-form .form-row {
        flex-direction: column;
    }

    .beta-form input {
        min-width: 100%;
    }
}