:root {
    color-scheme: light;
    --bg: #f2efe7;
    --bg-accent: #ddd4c4;
    --card: rgba(255, 252, 246, 0.92);
    --ink: #1e1b18;
    --muted: #6a6258;
    --line: rgba(30, 27, 24, 0.12);
    --accent: #6b3f24;
    --accent-strong: #4c2714;
    --danger: #a0251d;
    --shadow: 0 30px 80px rgba(62, 40, 25, 0.16);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at top left, rgba(107, 63, 36, 0.14), transparent 32%),
        radial-gradient(circle at bottom right, rgba(93, 124, 96, 0.14), transparent 28%),
        linear-gradient(180deg, var(--bg) 0%, var(--bg-accent) 100%);
}

.shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.card {
    width: min(100%, 440px);
    padding: 32px;
    border-radius: 24px;
    background: var(--card);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.eyebrow {
    margin: 0 0 12px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 0.72rem;
    color: var(--muted);
}

h1 {
    margin: 0 0 12px;
    font-family: "IBM Plex Serif", Georgia, serif;
    font-size: clamp(1.9rem, 4vw, 2.3rem);
    line-height: 1.05;
}

.muted {
    margin: 0 0 20px;
    color: var(--muted);
}

.stack {
    display: grid;
    gap: 14px;
}

.field {
    display: grid;
    gap: 8px;
    font-size: 0.95rem;
}

input {
    width: 100%;
    padding: 13px 14px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.9);
    color: var(--ink);
    font: inherit;
}

.button {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    min-height: 48px;
    padding: 12px 16px;
    border: 0;
    border-radius: 14px;
    text-decoration: none;
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: transform 180ms ease, background 180ms ease;
}

.button:hover {
    transform: translateY(-1px);
    background: var(--accent-strong);
}

.button.secondary {
    background: rgba(30, 27, 24, 0.08);
    color: var(--ink);
}

.error {
    margin: 0 0 16px;
    color: var(--danger);
    font-weight: 600;
}