* { margin: 0; padding: 0; box-sizing: border-box;
    font-family: system-ui, -apple-system, 'Segoe UI', 'Roboto', 'Microsoft YaHei', sans-serif; }
body { background: linear-gradient(135deg, #0f2b2a 0%, #1e6b5e 50%, #2c897b 100%); min-height: 100vh;
    display: flex; align-items: center; justify-content: center; position: relative; }
.login-card {
    background: white; border-radius: 24px; padding: 40px; width: 400px; max-width: 90%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}
.login-card.loading-box {
    min-height: auto;
}
.login-alert.hidden {
    display: none !important;
}
.login-alert.show {
    display: flex;
    animation: loginAlertIn 0.22s ease;
}
@keyframes loginAlertIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}
.login-card button:disabled {
    opacity: 0.72;
    cursor: not-allowed;
}
.login-card h1 { font-size: 1.3rem; color: #0f2b2a; text-align: center; margin-bottom: 8px; }
.login-card .subtitle { text-align: center; color: #8ba0b2; font-size: 0.85rem; margin-bottom: 28px; }
.login-card label { display: block; font-size: 0.85rem; color: #2c4b4a; margin-bottom: 6px; }
.login-card input {
    width: 100%; padding: 12px 16px; border: 1px solid #cfdee9; border-radius: 12px;
    font-size: 0.9rem; margin-bottom: 16px;
}
.login-card input:focus { border-color: #2c897b; outline: none; box-shadow: 0 0 0 3px rgba(44,137,123,0.1); }
.captcha-row { margin-bottom: 16px; }
.captcha-input-group {
    display: flex;
    align-items: center;
    gap: 10px;
}
.captcha-input-group input {
    flex: 1;
    margin-bottom: 0;
}
.captcha-input-group img {
    width: 120px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid #cfdee9;
    cursor: pointer;
    background: #fff;
}
.login-card button {
    width: 100%; padding: 12px; background: #2c897b; color: white; border: none;
    border-radius: 12px; font-size: 1rem; font-weight: 600; cursor: pointer; margin-top: 8px;
}
.login-card button:hover { background: #1f6e62; }
.login-alert {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 0.84rem;
    line-height: 1.45;
    margin-bottom: 16px;
}
.login-alert::before {
    content: '';
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}
.error-msg {
    color: #9b2c24;
    background: linear-gradient(135deg, #fff5f4 0%, #fdeeed 100%);
    border: 1px solid #f5d0cc;
}
.error-msg::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23c0392b' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cpath d='M15 9l-6 6M9 9l6 6'/%3E%3C/svg%3E");
}
.logout-msg {
    color: #1b7a62;
    background: linear-gradient(135deg, #f0fbf7 0%, #e8faf4 100%);
    border: 1px solid #c5e8db;
}
.logout-msg::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231b7a62' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6L9 17l-5-5'/%3E%3C/svg%3E");
}