:root {
    --bg: #f4f6f8;
    --card: #fff;
    --text: #17202a;
    --muted: #667085;
    --accent: #2563eb;
    --accent-dark: #1d4ed8;
    --border: #e4e7ec;
}

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

body {
    font-family: Inter, Segoe UI, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* layout */
.login-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 56px);
    padding: 32px 20px;
}

/* card */
.login-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 36px 32px;
    box-shadow: 0 5px 18px rgba(16, 24, 40, .05);
    width: 100%;
    max-width: 400px;
}

.login-header {
    margin-bottom: 28px;
}

.login-title {
    font-size: 22px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 6px;
}

.login-sub {
    font-size: 13px;
    color: var(--muted);
    line-height: 1.5;
}

/* error banner */
.login-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
}

.login-error.hidden {
    display: none;
}

/* form */
.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.field-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.field-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: .04em;
}

.field-group input {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    background: #fff;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.field-group input::placeholder {
    color: #b0b8c4;
}

.field-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

/* password toggle */
.password-wrap {
    position: relative;
}

.password-wrap input {
    padding-right: 42px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--muted);
    display: flex;
    align-items: center;
    padding: 0;
    transition: color 0.15s;
}

.toggle-password:hover {
    color: var(--text);
}

/* submit button */
.btn-login {
    width: 100%;
    padding: 13px;
    background: #1e3a6e;
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background 0.15s, transform 0.1s;
    margin-top: 4px;
}

.btn-login:hover {
    background: var(--accent);
}

.btn-login:active {
    transform: scale(0.98);
}

.btn-login:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* spinner inside button */
.btn-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

.btn-spinner.hidden {
    display: none;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* footer */
.login-footer {
    margin-top: 24px;
    font-size: 13px;
    color: var(--muted);
    text-align: center;
}

.login-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

.login-footer a:hover {
    text-decoration: underline;
}

@media (max-width: 480px) {
    .login-card {
        padding: 28px 20px;
    }
}