/* ==========================================
   全局样式和CSS变量
   ========================================== */
:root {
    /* 主题色 */
    --color-primary: #2563EB;
    --color-secondary: #6B7280;
    --color-text: #1F2937;
    --color-text-light: #9CA3AF;
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-google: #000000;
    
    /* 弹窗相关 */
    --overlay-bg: rgba(0, 0, 0, 0.5);
    --modal-bg: #FFFFFF;
    --modal-radius: 16px;
    --modal-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* ==========================================
   重置和基础样式
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    line-height: 1.6;
    background: linear-gradient(135deg, #E9D5FF 0%, #A5F3FC 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==========================================
   顶部导航栏
   ========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-white);
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header__container {
    max-width: 1440px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header__logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.header__logo a {
    display: flex;
    align-items: center;
    transition: opacity 0.2s ease;
}

.header__logo a:hover {
    opacity: 0.8;
}

.logo {
    height: 40px;
    width: auto;
    display: block;
    margin-right: var(--spacing-sm);
}

.logo-text {
    display: inline-block;
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 4px;
    font-size: 18px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
    white-space: nowrap;
    margin-left: var(--spacing-md);
}

/* 保留占位符样式以备后用 */
.logo-placeholder {
    width: 40px;
    height: 40px;
    background: #D1D5DB;
    border-radius: 4px;
}

.header__nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 16px;
}

.nav-link {
    color: var(--color-text);
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link--action {
    font-weight: 500;
    cursor: pointer;
}

.nav-divider {
    color: var(--color-secondary);
}

/* ==========================================
   主内容区域
   ========================================== */
.main {
    padding-top: 100px;
    padding-bottom: var(--spacing-2xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.main__container {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--spacing-2xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
}

/* 左侧手机展示区 */
.main__phone {
    flex: 1;
    min-width: 300px;
    display: flex;
    justify-content: center;
}

.phone-mockup {
    position: relative;
    display: flex;
    gap: var(--spacing-lg);
}

.phone-screen {
    width: 400px;
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    background: var(--color-black);
}


.phone-image {
    width: 100%;
    height: auto;
    display: block;
}

/* 右侧内容区 */
.main__content {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.main__title {
    font-size: 64px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-2xl);
    color: var(--color-text);
}

.download-button {
    display: inline-block;
    transition: transform 0.2s;
}

.download-button:hover {
    transform: translateY(-2px);
}

.download-button__image {
    height: 60px;
    width: auto;
}

/* ==========================================
   弹窗系统
   ========================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--overlay-bg);
    z-index: 200;
    display: none;
    animation: fadeIn 0.2s ease-out;
}

.modal-overlay.active {
    display: block;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    z-index: 201;
    display: none;
    animation: modalIn 0.3s ease-out forwards;
}

.modal.active {
    display: block;
}

.modal__content {
    background: var(--modal-bg);
    border-radius: var(--modal-radius);
    padding: var(--spacing-xl);
    min-width: 320px;
    max-width: 400px;
    box-shadow: var(--modal-shadow);
}

.modal__title {
    font-size: 24px;
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.modal__subtitle {
    font-size: 14px;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.modal__user-id {
    font-size: 18px;
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.modal__warning {
    font-size: 13px;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

/* ==========================================
   按钮样式
   ========================================== */
.btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.2s;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn:last-child {
    margin-bottom: 0;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

/* Google登录按钮 */
.btn--google {
    background: var(--color-google);
    color: var(--color-white);
    font-weight: 600;
}

.btn--google:hover {
    background: #1a1a1a;
}

.btn__icon {
    flex-shrink: 0;
}

/* 主要按钮（蓝色） */
.btn--primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn--primary:hover {
    background: #1E40AF;
}

/* 次要按钮（灰色） */
.btn--secondary {
    background: #E5E7EB;
    color: var(--color-text);
}

.btn--secondary:hover {
    background: #D1D5DB;
}

/* 文本按钮 */
.btn--text {
    background: transparent;
    color: var(--color-secondary);
    padding: var(--spacing-sm) 0;
}

.btn--text:hover {
    color: var(--color-text);
    transform: none;
}

/* ==========================================
   动画效果
   ========================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 1024px) {
    .main__container {
        flex-direction: column;
        text-align: center;
    }
    
    .phone-mockup {
        flex-direction: column;
        align-items: center;
    }
    
    
    .main__title {
        font-size: 48px;
    }
}

@media (max-width: 768px) {
    .header__container {
        padding: var(--spacing-sm) var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .header__logo {
        justify-content: center;
    }
    
    .logo-text {
        font-size: 16px;
        padding: 6px 12px;
        margin-left: var(--spacing-sm);
    }
    
    .header__nav {
        font-size: 14px;
        gap: var(--spacing-sm);
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .main {
        padding-top: 120px;
    }
    
    .main__container {
        padding: var(--spacing-lg);
    }
    
    .main__title {
        font-size: 36px;
    }
    
    .phone-screen {
        width: 220px;
    }
    
    
    .modal__content {
        min-width: 280px;
        padding: var(--spacing-lg);
    }
    
    .modal__title {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .main__title {
        font-size: 28px;
    }
    
    .download-button__image {
        height: 48px;
    }
    
    .phone-screen {
        width: 180px;
    }
    
    
    .btn {
        font-size: 14px;
        padding: 10px var(--spacing-md);
    }
    
    .footer {
        padding: var(--spacing-md);
    }
    
    .footer__container {
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
    
    .footer__company,
    .footer__contact {
        font-size: 16px;
    }
    
    .footer__contact {
        flex-direction: column;
        gap: 0;
    }
    
    .footer__label::after {
        content: '';
    }
}

/* ==========================================
   底部信息区域
   ========================================== */
.footer {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    padding: var(--spacing-lg) var(--spacing-xl);
    margin-top: calc(-1 * var(--spacing-2xl));
    position: relative;
    z-index: 10;
}

.footer__container {
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    text-align: center;
}

.footer__company {
    font-size: 20px;
    color: var(--color-text);
    font-weight: 700;
    line-height: 1.2;
    margin: 0;
}

.footer__contact {
    font-size: 20px;
    color: var(--color-text);
    font-weight: 700;
    line-height: 1.2;
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    justify-content: center;
}

.footer__label {
    color: var(--color-text);
}

.footer__email {
    color: var(--color-primary);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.footer__email:hover {
    opacity: 0.8;
    text-decoration: underline;
}