/* ===== 登录页样式 ===== */

.login-page {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 400px;
}

/* 头部 */
.login-header {
    text-align: center;
    margin-bottom: 32px;
    color: white;
}

.logo {
    font-size: 64px;
    margin-bottom: 16px;
}

.login-header h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 14px;
    opacity: 0.8;
}

/* 认证卡片 */
.auth-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-lg);
}

.auth-card.hidden {
    display: none;
}

/* 标签切换 */
.card-tabs {
    display: flex;
    margin-bottom: 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 4px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: none;
    background: none;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn.active {
    background: var(--card-bg);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

/* 表单 */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.input-wrapper {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border: 2px solid transparent;
    transition: border-color 0.2s;
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
}

.input-icon {
    padding: 0 12px;
    font-size: 18px;
}

.input-wrapper input {
    flex: 1;
    padding: 14px 14px 14px 0;
    border: none;
    background: none;
    font-size: 15px;
    color: var(--text-color);
    outline: none;
}

.input-wrapper input::placeholder {
    color: var(--text-muted);
}

/* 错误提示 */
.form-error {
    color: var(--error-color);
    font-size: 13px;
    min-height: 20px;
    text-align: center;
}

/* 提交按钮 */
.btn-submit {
    width: 100%;
    padding: 14px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-submit:hover {
    background: var(--primary-light);
}

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

/* 游客入口 */
.guest-entry {
    margin-top: 20px;
    text-align: center;
}

.guest-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
}

.guest-link:hover {
    text-decoration: underline;
}

/* 底部 */
.login-footer {
    margin-top: 24px;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .login-container {
        max-width: 100%;
    }

    .logo {
        font-size: 56px;
    }

    .login-header h1 {
        font-size: 24px;
    }
}

@media (min-width: 769px) {
    .login-container {
        min-width: 400px;
    }

    .auth-card {
        padding: 32px;
    }
}

/* ===== 深色模式 ===== */
@media (prefers-color-scheme: dark) {
    .login-page {
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    }

    .input-wrapper {
        background: rgba(255, 255, 255, 0.05);
    }
}