:root {
    color-scheme: light dark;
    --bg: #0f172a;
    --surface: #1e293b;
    --surface-2: #334155;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --accent: #10b981;
    --danger: #ef4444;
    --radius: 14px;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f8fafc;
        --surface: #ffffff;
        --surface-2: #e2e8f0;
        --text: #0f172a;
        --muted: #64748b;
    }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg); color: var(--text);
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    min-height: 100dvh;
}

.app-shell { max-width: 640px; margin: 0 auto; padding: 1rem; }
.app-header h1 { margin: 0 0 .75rem; font-size: 1.4rem; }
.app-header nav { display: flex; gap: .5rem; overflow-x: auto; padding-bottom: .5rem; }
.app-header nav a {
    color: var(--muted); text-decoration: none;
    padding: .4rem .75rem; border-radius: 999px;
    background: var(--surface); white-space: nowrap; font-size: .9rem;
}
.app-header nav a.active { background: var(--accent); color: #fff; }

main { padding-top: .5rem; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem; margin-top: 1rem; }
.card {
    background: var(--surface); border-radius: var(--radius);
    padding: 1rem; text-align: center;
}
.card .label { font-size: .75rem; color: var(--muted); text-transform: uppercase; }
.card .value { font-size: 1.2rem; font-weight: 600; margin-top: .35rem; }
.value.positive { color: var(--accent); }
.value.negative { color: var(--danger); }

.fab {
    position: fixed; right: 1rem; bottom: calc(1rem + env(safe-area-inset-bottom));
    width: 56px; height: 56px; border-radius: 50%; border: none;
    background: var(--accent); color: white; font-size: 2rem;
    box-shadow: 0 8px 24px rgba(0,0,0,.35); cursor: pointer;
}

.unlock { max-width: 380px; margin: 3rem auto; text-align: center; }
.unlock input, .unlock button {
    display: block; width: 100%; padding: .8rem; margin: .5rem 0;
    border-radius: var(--radius); border: 1px solid var(--surface-2);
    background: var(--surface); color: var(--text); font-size: 1rem;
}
.unlock button { background: var(--accent); color: #fff; border: none; font-weight: 600; }
.unlock button:disabled { opacity: .5; }

.form-quick { display: flex; flex-direction: column; gap: .75rem; margin-top: 1rem; }
.form-quick label { display: flex; flex-direction: column; gap: .25rem; color: var(--muted); font-size: .85rem; }
.form-quick input, .form-quick select, .form-quick textarea {
    padding: .7rem; border-radius: var(--radius);
    border: 1px solid var(--surface-2); background: var(--surface); color: var(--text);
    font-size: 1rem;
}
.form-quick button[type=submit] {
    padding: .9rem; border: none; border-radius: var(--radius);
    background: var(--accent); color: #fff; font-weight: 600; font-size: 1rem;
}

.type-toggle { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; }
.type-toggle button {
    padding: .7rem; border-radius: var(--radius);
    border: 1px solid var(--surface-2); background: var(--surface);
    color: var(--muted); font-weight: 600;
}
.type-toggle button.on { background: var(--accent); color: #fff; border-color: var(--accent); }

.err { color: var(--danger); font-size: .9rem; }