.btn-primary {
    width: 100%;
    padding: 10px 12px;
    border: none;
    border-radius: 8px;
    background: #3b82f6;
    color: #fff;
    font-size: 15px;
    cursor: pointer;
    transition: background 0.2s;
}
.btn-primary:hover {
    background: #2563eb;
}
:root {
    color-scheme: light;
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #1b1f2a;
    --muted: #6b7280;
    --border: #e5e7eb;
    --accent: #3b82f6;
    --accent-dark: #2563eb;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: linear-gradient(135deg, #eef2ff, #f8fafc);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
}
.card {
    width: 100%;
    max-width: 520px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 42px;
    padding: 24px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}
h2 {
    margin: 0 0 16px;
    font-size: 24px;
}
.actions {
    display: flex;
    justify-content: flex-end;
}
.subtitle {
    margin: 0 0 20px;
    color: var(--muted);
    font-size: 14px;
}
.field {
    margin-bottom: 14px;
}
label {
    display: block;
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 6px;
}
input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}
button {
    width: 100%;
    padding: 10px 12px;
    border: none;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    font-size: 15px;
    cursor: pointer;
    transition: background 0.2s;
}
button:hover { background: var(--accent-dark); }
.helper {
    margin-top: 14px;
    font-size: 12px;
    color: var(--muted);
    text-align: center;
}