:root {
    --bg: #f6f5f1;
    --surface: #ffffff;
    --text: #1f2421;
    --muted: #5d665f;
    --accent: #2f6b4f;
    --accent-text: #ffffff;
    --border: #d9dcd6;
    --error-bg: #fbeaea;
    --error-text: #8a1f1f;
    --success-bg: #e8f3ec;
    --success-text: #1f5136;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #161917;
        --surface: #1f2421;
        --text: #e8ebe7;
        --muted: #a3aca5;
        --accent: #5fae86;
        --accent-text: #0f1411;
        --border: #343b36;
        --error-bg: #3a1d1d;
        --error-text: #f2b8b8;
        --success-bg: #1d3327;
        --success-text: #b6e2c8;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    line-height: 1.5;
    background: var(--bg);
    color: var(--text);
}

.container { max-width: 40rem; margin: 3rem auto; padding: 0 1rem; }

h1 { font-size: 1.6rem; margin: 0 0 .5rem; }

.hint { color: var(--muted); margin: 0 0 1.5rem; }

.form {
    display: grid;
    gap: .75rem;
    padding: 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: .5rem;
}

label { font-weight: 600; }

input[type="file"] {
    padding: .5rem;
    border: 1px dashed var(--border);
    border-radius: .375rem;
    background: var(--bg);
    color: var(--text);
}

button {
    justify-self: start;
    padding: .6rem 1.1rem;
    border: 0;
    border-radius: .375rem;
    background: var(--accent);
    color: var(--accent-text);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

button:hover { filter: brightness(1.08); }

input[type="email"],
input[type="password"] {
    padding: .55rem .65rem;
    border: 1px solid var(--border);
    border-radius: .375rem;
    background: var(--bg);
    color: var(--text);
    font: inherit;
}

.session {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    justify-content: flex-end;
    align-items: baseline;
    margin: 0 0 1.5rem;
    color: var(--muted);
    font-size: .9rem;
}

.session .link {
    padding: 0;
    background: none;
    color: var(--accent);
    font-weight: 600;
    text-decoration: underline;
}

.message { margin: 0 0 1.25rem; padding: .9rem 1.1rem; border-radius: .5rem; }
.message p { margin: 0 0 .4rem; }
.message ul { margin: 0; padding-left: 1.2rem; }
.message--error { background: var(--error-bg); color: var(--error-text); }
.message--success { background: var(--success-bg); color: var(--success-text); }

code { overflow-wrap: anywhere; }