/* ── Zetyra.ai — Minimal Landing ── */

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

:root {
    --bg: #fafaf8;
    --text: #1a1a1a;
    --text-secondary: #6b6b6b;
    --text-faint: #999;
    --accent: #2a7a5a;
    --rule: #e0e0dc;
    --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'IBM Plex Mono', 'SF Mono', 'Consolas', monospace;
}

html {
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-weight: 300;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    max-width: 640px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

/* ── Hero ── */

.hero {
    padding-top: clamp(6rem, 18vh, 12rem);
    padding-bottom: 4rem;
}

.logo-mark {
    margin-bottom: 2.5rem;
}

.logo-icon {
    width: 56px;
    height: 56px;
    display: block;
}

h1 {
    font-family: var(--font-sans);
    font-weight: 400;
    font-size: clamp(1.6rem, 4vw, 2.1rem);
    line-height: 1.35;
    letter-spacing: -0.01em;
    color: var(--text);
}

/* ── Observation / Lab-note section ── */

.observation {
    padding: 3rem 0;
    border-top: 1px solid var(--rule);
}

.negation {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 2;
    letter-spacing: 0.01em;
}

.thesis {
    margin-top: 1.8rem;
    font-size: 1.05rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--text);
    max-width: 520px;
}

/* ── Status ── */

.status {
    padding: 3rem 0;
    border-top: 1px solid var(--rule);
}

.status-label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-faint);
    margin-bottom: 0.5rem;
}

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

/* ── Contact ── */

.contact {
    padding: 3rem 0;
    border-top: 1px solid var(--rule);
}

.contact-label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-faint);
    margin-bottom: 0.5rem;
}

.contact-email a {
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px solid var(--rule);
    padding-bottom: 1px;
    transition: border-color 0.2s ease;
}

.contact-email a:hover {
    border-color: var(--text);
}

/* ── Footer ── */

footer {
    max-width: 640px;
    margin: 0 auto;
    padding: 4rem 2rem 3rem;
    width: 100%;
}

footer p {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-faint);
    letter-spacing: 0.02em;
}

/* ── Responsive ── */

@media (max-width: 480px) {
    html {
        font-size: 16px;
    }

    main {
        padding: 0 1.5rem;
    }

    .hero {
        padding-top: 4rem;
        padding-bottom: 3rem;
    }

    .logo-icon {
        width: 48px;
        height: 48px;
    }

    footer {
        padding: 3rem 1.5rem 2rem;
    }
}