:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --bg: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text: #0f172a;
    --text-muted: #64748b;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

.main {
    flex: 1;
    padding: 2rem 1.25rem;
    min-width: 0;
}

.footer {
    padding: 1.5rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--border);
}

.login-page {
    min-height: calc(100vh - 8rem);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

.login-card {
    width: 100%;
    max-width: 420px;
}

.login-card h1 {
    text-align: center;
    margin-bottom: 0.25rem;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
}

.login-card .subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.375rem;
    font-size: 0.9375rem;
}

.form-group input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    background: #fff;
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.hp-field {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.625rem 1.125rem;
    border-radius: var(--radius);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    touch-action: manipulation;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
}

.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.alert {
    padding: 0.875rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1.25rem;
    font-weight: 500;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

@media (max-width: 640px) {
    .login-page {
        padding: 1.25rem 0.875rem;
        padding-top: max(1.25rem, env(safe-area-inset-top));
        padding-bottom: max(1.25rem, env(safe-area-inset-bottom));
        align-items: flex-start;
        min-height: calc(100vh - 6rem);
    }

    .login-card {
        margin-top: 10vh;
    }

    .form-group input {
        font-size: 1rem;
    }
}