:root {
    --color-bg: #f5f6f8;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-border-strong: #d1d5db;
    --color-text: #1f2937;
    --color-text-muted: #6b7280;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-soft: #eff4ff;
    --color-danger: #dc2626;
    --color-danger-soft: #fef2f2;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-md: 0 2px 8px rgba(16, 24, 40, 0.08);
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-6: 24px;
    --space-8: 32px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
h1, p { margin: 0; }
a:focus-visible, button:focus-visible, input:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}
.login-body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.login-page {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    padding: var(--space-4);
}
.login-card {
    width: 100%;
    max-width: 360px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-8) var(--space-6);
}
.login-card__brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-bottom: var(--space-6);
}
.login-card__mark {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 20px;
    margin-bottom: var(--space-3);
}
.login-card__title { font-size: 18px; font-weight: 700; }
.login-card__subtitle { font-size: 13px; color: var(--color-text-muted); margin-top: var(--space-1); }
.login-alert {
    background: var(--color-danger-soft);
    color: var(--color-danger);
    border-radius: var(--radius-sm);
    padding: var(--space-3);
    font-size: 13px;
    margin-bottom: var(--space-4);
}
.form-group { margin-bottom: var(--space-4); }
.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--color-text);
}
.form-control {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font-size: 14px;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-sm);
}
.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-soft);
}
@media (max-width: 900px) {
    .form-control { font-size: 16px; }
}
.password-input-wrapper { position: relative; }
.password-input-wrapper .form-control { padding-right: 2.5rem; }
.password-toggle-btn {
    position: absolute;
    top: 50%;
    right: 4px;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background: none;
    border: none;
    border-radius: 50%;
    padding: 0;
    color: var(--color-text-muted);
    cursor: pointer;
}
.password-toggle-btn:hover { color: var(--color-primary); background: var(--color-primary-soft); }
.remember-me {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
    font-size: 13px;
    color: var(--color-text-muted);
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-weight: 600;
    cursor: pointer;
}
.btn:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--color-primary-hover); }
.btn-block { width: 100%; padding: var(--space-3); font-size: 14px; }
.btn-spinner {
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: btn-spin 0.7s linear infinite;
}
@keyframes btn-spin { to { transform: rotate(360deg); } }
.login-footer {
    text-align: center;
    padding: var(--space-4) var(--space-6);
    font-size: 12px;
    color: var(--color-text-muted);
}