:root {
    --bg: #f3f5f7;
    --card: #ffffff;
    --text: #17202a;
    --muted: #5d6b79;
    --border: #d5dbe1;
    --accent: #128c7e;
    --accent-text: #ffffff;
    --error-bg: #fdecea;
    --error-text: #a32018;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #11181f;
        --card: #1a232c;
        --text: #e8edf1;
        --muted: #9aa8b5;
        --border: #2e3b47;
        --accent: #25b09b;
        --accent-text: #08201c;
        --error-bg: #3a1c1a;
        --error-text: #ffb4ab;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
    width: 100%;
    max-width: 640px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
}

.card.narrow { max-width: 400px; }

h1 { margin: 0 0 4px; font-size: 1.5rem; }
.sub { margin: 0 0 20px; color: var(--muted); }

label { display: block; margin: 14px 0 6px; font-weight: 600; font-size: .9rem; }

input[type=text], input[type=tel], input[type=password] {
    width: 100%;
    padding: 10px 12px;
    font: inherit;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
}

input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

button {
    width: 100%;
    margin-top: 20px;
    padding: 11px 14px;
    font: inherit;
    font-weight: 600;
    color: var(--accent-text);
    background: var(--accent);
    border: 0;
    border-radius: 8px;
    cursor: pointer;
}

button.secondary {
    width: auto;
    margin: 0;
    color: var(--text);
    background: transparent;
    border: 1px solid var(--border);
}

.error {
    margin: 0 0 8px;
    padding: 10px 12px;
    color: var(--error-text);
    background: var(--error-bg);
    border-radius: 8px;
    font-size: .9rem;
}

.switch { margin: 18px 0 0; text-align: center; color: var(--muted); font-size: .9rem; }
.switch a { color: var(--accent); font-weight: 600; }

.row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: .75rem;
    font-weight: 600;
    color: var(--accent-text);
    background: var(--accent);
    border-radius: 999px;
}