/* ============================================================
 *  AZhai NAV · 登录 / 注册页样式
 *  依赖 nav.css
 * ============================================================ */

body.auth-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-card {
    width: min(440px, 100%);
    padding: 40px 36px;
    background: var(--bg-card);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
}

.logo {
    width: 54px; height: 54px;
    display: grid; place-items: center;
    margin-bottom: 26px;
    background: linear-gradient(135deg, var(--accent-from), var(--accent-to));
    color: #fff;
    border-radius: 16px;
    font-size: 18px; font-weight: 800;
    box-shadow: 0 8px 20px rgba(59, 130, 246, .28);
}

.auth-card h1 {
    margin: 0 0 8px;
    font-size: 28px; font-weight: 900;
    letter-spacing: -0.8px;
    color: var(--text-primary);
}

.auth-card .subtitle {
    margin: 0 0 28px;
    color: var(--text-tertiary);
    font-size: 13px;
    line-height: 1.6;
}

.auth-card .form-group { margin-bottom: 18px; }

.auth-card label {
    display: block;
    margin-bottom: 8px;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-secondary);
}

.auth-card label .optional {
    color: var(--text-tertiary);
    font-weight: 400;
    font-size: 11px;
}

.auth-card input {
    width: 100%;
    padding: 13px 16px;
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    background: var(--bg-input);
    color: var(--text-primary);
    outline: none;
    font-size: 14px;
    transition: .2s;
}
.auth-card input::placeholder { color: var(--text-tertiary); }
.auth-card input:focus {
    border-color: var(--accent-from);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.auth-card button[type="submit"] {
    width: 100%;
    padding: 14px;
    margin-top: 6px;
    border: 0;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-from), var(--accent-to));
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: .2s;
    box-shadow: 0 8px 20px rgba(59, 130, 246, .26);
}
.auth-card button[type="submit"]:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 26px rgba(59, 130, 246, .34);
}

.auth-card .error {
    margin-bottom: 20px;
    padding: 12px 16px;
    background: rgba(239, 68, 68, .10);
    color: #dc2626;
    border: 1px solid rgba(239, 68, 68, .22);
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 600;
}
body.dark .auth-card .error {
    background: rgba(239, 68, 68, .15);
    color: #f87171;
}

.auth-card .footer {
    margin-top: 26px;
    text-align: center;
    font-size: 13px;
    color: var(--text-tertiary);
}
.auth-card .footer a {
    color: var(--text-primary);
    font-weight: 700;
    border-bottom: 1px solid transparent;
    transition: .2s;
}
.auth-card .footer a:hover { border-bottom-color: var(--text-primary); }

.auth-card .back {
    display: block;
    margin-top: 16px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 12px;
    transition: .2s;
}
.auth-card .back:hover { color: var(--text-primary); }

/* 右上角固定主题按钮（可选，如果登录页想用） */
.theme-toggle-fixed {
    position: fixed;
    top: 24px;
    right: 24px;
    width: 44px; height: 44px;
    display: grid; place-items: center;
    border: 1px solid var(--border-medium);
    border-radius: 14px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: .2s;
}
.theme-toggle-fixed:hover { transform: scale(1.05); }

@media (max-width: 480px) {
    .auth-card { padding: 32px 24px; border-radius: 22px; }
    .auth-card h1 { font-size: 24px; }
    .theme-toggle-fixed { top: 16px; right: 16px; width: 40px; height: 40px; }
}