/* PC 端：注重排版、背景模糊和呼吸感 */
:root {
    --apple-blue: #007AFF;
    --glass-bg: rgba(255, 255, 255, 0.72);
}

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    /* 老兵建议：背景用一个柔和的渐变，衬托出毛玻璃卡片 */
    background: radial-gradient(circle at 50% 50%, #f5f7fa 0%, #dbe2ef 100%);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.glass-card {
    width: 380px;
    padding: 40px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 28px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    text-align: center;
}

.brand-title {
    font-size: 32px;
    font-weight: 700;
    color: #1d1d1f;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

/* 这里的下拉框要改成 Apple 风格 */
select {
    width: 100%;
    padding: 10px;
    border-radius: 10px;
    border: 1px solid rgba(0,0,0,0.1);
    background: rgba(255,255,255,0.5);
    margin-bottom: 25px;
    outline: none;
    font-size: 14px;
}

/* 重点修复：OAuth 按钮标准化 */
.oauth-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn-oauth {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 48px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border-radius: 12px;
    transition: all 0.2s ease;
    border: 1px solid rgba(0,0,0,0.05);
}

.btn-oauth img {
    width: 20px;
    margin-right: 10px;
}

.btn-google { background: #FFFFFF; color: #3c4043; }
.btn-apple { background: #000000; color: #FFFFFF; }

.btn-oauth:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* ===== 登录/注册表单（邮箱+密码） ===== */

/* 状态提示条：错误 / 成功 */
.auth-message {
    border-radius: 12px;
    padding: 12px 14px;
    font-size: 13px;
    line-height: 1.5;
    text-align: left;
    margin-bottom: 16px;
}
.auth-message.error { background: rgba(255, 59, 48, 0.1); color: #c0392b; }
.auth-message.success { background: rgba(52, 199, 89, 0.12); color: #1d7a2c; }
.auth-message h2 { margin: 0 0 8px; font-size: 17px; }
.auth-message p { margin: 0; }

/* "或者" 分隔线 */
.divider {
    display: flex;
    align-items: center;
    margin: 22px 0 18px;
    color: #86868b;
    font-size: 13px;
}
.divider::before,
.divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: rgba(0, 0, 0, 0.1);
}
.divider span { padding: 0 12px; }

/* 邮箱+密码表单 */
.login-form { display: flex; flex-direction: column; gap: 12px; }
.login-form input {
    height: 48px;
    padding: 0 16px;
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.8);
    font-size: 15px;
    outline: none;
    box-sizing: border-box;
}
.login-form input:focus { border-color: var(--apple-blue); }
.btn-login {
    height: 48px;
    border: none;
    border-radius: 12px;
    background: var(--apple-blue);
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: filter 0.2s ease;
}
.btn-login:hover { filter: brightness(1.06); }

/* 注册页标题与登录/注册互换提示 */
.form-title { font-size: 20px; color: #1d1d1f; margin: 0 0 18px; }
.form-desc { font-size: 13px; color: #86868b; margin: -8px 0 16px; }
.register-hint { font-size: 13px; color: #86868b; margin-top: 20px; }
.register-hint a { color: var(--apple-blue); text-decoration: none; font-weight: 500; margin-left: 4px; }