/* ============================================
   蜜探日本 mitan.jp - 主样式表
   设计系统 & 全局样式
   ============================================ */

/* CSS Variables - 设计令牌 */
:root {
    /* 色彩系统 */
    --color-primary: #0052D9;
    --color-primary-dark: #003D99;
    --color-primary-light: #3375E0;
    --color-accent: #FF6A00;
    --color-accent-dark: #E65F00;
    --color-gray: #F5F7FA;
    --color-white: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-secondary: #666666;
    --color-text-light: #AEB8C4;
    --color-footer-bg: #001529;
    
    /* 字体系统 */
    --font-zh: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-jp: 'Noto Sans JP', 'Hiragino Kaku Gothic Pro', 'Yu Gothic', sans-serif;
    --font-base: var(--font-zh);
    
    /* 间距系统 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;
    --spacing-2xl: 80px;
    
    /* 阴影系统 */
    --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px 0 rgba(0, 0, 0, 0.16);
    --shadow-hover: 0 8px 16px 0 rgba(0, 82, 217, 0.2);
    
    /* 圆角系统 */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-full: 50%;
    
    /* 过渡动画 */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 600ms ease;
    
    /* 容器宽度 */
    --container-max: 1200px;
    --container-padding: 24px;
    
    /* 导航栏 */
    --navbar-height: 64px;
}

/* 日语字体模式 */
[data-lang="ja"] {
    --font-base: var(--font-jp);
}

/* ============================================
   Reset & Base
   ============================================ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    font-size: 16px;
}

body {
    font-family: var(--font-base);
    color: var(--color-text);
    background-color: var(--color-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

ul, ol {
    list-style: none;
}

/* 可访问性 - 键盘焦点 */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* 屏幕阅读器专用 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================
   Layout - 容器
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ============================================
   Navigation - 顶部导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: box-shadow var(--transition-base);
}

.navbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.navbar__logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    margin-left: 24px;
}

.navbar__logo svg {
    height: 40px;
    width: auto;
}

.navbar__menu {
    display: flex;
    align-items: center;
    gap: 32px;
    margin-left: 48px;
}

.navbar__link {
    position: relative;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
    padding: 8px 0;
    transition: color var(--transition-fast);
    white-space: nowrap;
}

.navbar__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

.navbar__link:hover,
.navbar__link.active {
    color: var(--color-primary);
}

.navbar__link:hover::after,
.navbar__link.active::after {
    width: 100%;
}

.navbar__actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* 语言切换按钮 */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid #E0E0E0;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    background: var(--color-white);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.lang-switch:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.lang-switch__current {
    font-weight: 600;
}

/* 汉堡菜单按钮 */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Mobile Menu - 移动端侧滑菜单
   ============================================ */
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    visibility: hidden;
}

.mobile-menu.active {
    visibility: visible;
}

.mobile-menu__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.mobile-menu.active .mobile-menu__overlay {
    opacity: 1;
}

.mobile-menu__drawer {
    position: absolute;
    top: 0;
    right: 0;
    width: 280px;
    height: 100%;
    background: var(--color-white);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    padding: 24px;
    overflow-y: auto;
}

.mobile-menu.active .mobile-menu__drawer {
    transform: translateX(0);
}

.mobile-menu__close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    font-size: 28px;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: background var(--transition-fast);
}

.mobile-menu__close:hover {
    background: var(--color-gray);
}

.mobile-menu__nav {
    margin-top: 60px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mobile-menu__link {
    display: block;
    padding: 14px 16px;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.mobile-menu__link:hover,
.mobile-menu__link.active {
    background: var(--color-gray);
    color: var(--color-primary);
}

.mobile-menu__lang {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid #E0E0E0;
}

/* ============================================
   Hero Banner - 通栏轮播
   ============================================ */
.hero {
    position: relative;
    width: 100vw;
    height: 560px;
    margin-top: var(--navbar-height);
    overflow: hidden;
}

.hero__slider {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero__slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 800ms ease-in-out;
}

.hero__slide.active {
    opacity: 1;
}

.hero__image-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 82, 217, 0.35) 0%, rgba(0, 82, 217, 0.2) 100%);
}

.hero__content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    text-align: center;
    z-index: 10;
    color: var(--color-white);
}

.hero__title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 16px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero__subtitle {
    font-size: 18px;
    font-weight: 400;
    margin-bottom: 32px;
    opacity: 0.95;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* 轮播指示器 */
.hero__indicators {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 20;
}

.hero__indicator {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.5);
    border: 2px solid rgba(255, 255, 255, 0.8);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.hero__indicator:hover {
    background: rgba(255, 255, 255, 0.8);
}

.hero__indicator.active {
    background: var(--color-white);
    border-color: var(--color-white);
    transform: scale(1.2);
}

/* ============================================
   Buttons - 按钮组件
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    text-align: center;
    white-space: nowrap;
}

.btn--primary {
    background: var(--color-primary);
    color: var(--color-white);
    border: 2px solid var(--color-primary);
}

.btn--primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn--outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn--outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.btn--large {
    padding: 14px 40px;
    font-size: 18px;
}

/* ============================================
   Section - 通用区块样式
   ============================================ */
.section {
    padding: var(--spacing-2xl) 0;
}

.section__title {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-primary);
    text-align: center;
    margin-bottom: 48px;
    position: relative;
}

.section__title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-accent);
    margin: 12px auto 0;
    border-radius: 2px;
}

/* ============================================
   Popular Products - 人气商品区块
   ============================================ */
.section--popular {
    background: var(--color-gray);
}

.popular__tabs {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 48px;
    border-bottom: 1px solid #E0E0E0;
    padding-bottom: 0;
}

.popular__tab {
    padding: 12px 20px;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
    transition: all var(--transition-fast);
    cursor: pointer;
    white-space: nowrap;
}

.popular__tab::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

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

.popular__tab.active {
    color: var(--color-primary);
    font-weight: 600;
}

.popular__tab.active::after {
    width: 100%;
}

.popular__panels {
    position: relative;
    overflow: hidden;
}

.popular__panel {
    display: none;
    animation: fadeIn 400ms ease;
}

.popular__panel.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.popular__panel-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.popular__image-wrapper {
    width: 100%;
    height: 400px;
    overflow: hidden;
}

.popular__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.popular__panel-inner:hover .popular__image {
    transform: scale(1.05);
}

.popular__content {
    padding: 32px 40px 32px 0;
}

.popular__category-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 20px;
}

.popular__features {
    margin-bottom: 28px;
}

.popular__features li {
    font-size: 16px;
    line-height: 2;
    color: var(--color-text-secondary);
}

/* ============================================
   About - 关于我们区块
   ============================================ */
.section--about {
    background: var(--color-white);
}

/* 公司介绍 */
.about__intro {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 40px;
    align-items: center;
    margin-bottom: 60px;
}

.about__intro-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.about__image {
    width: 320px;
    height: 240px;
    object-fit: cover;
}

.about__subtitle {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.about__desc {
    font-size: 16px;
    line-height: 1.75;
    color: var(--color-text-secondary);
}

/* 服务承诺 */
.about__promises {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.about__promise-card {
    text-align: center;
    padding: 32px 24px;
    background: var(--color-gray);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.about__promise-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    background: var(--color-white);
}

.about__promise-icon {
    margin-bottom: 16px;
}

.about__promise-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.about__promise-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* 公司优势 */
.about__advantages {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.about__advantage-card {
    text-align: center;
    padding: 32px 24px;
    background: var(--color-white);
    border: 1px solid #E0E0E0;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.about__advantage-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.about__advantage-card svg {
    margin-bottom: 16px;
}

.about__advantage-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.about__advantage-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============================================
   Partners - 合作伙伴区块
   ============================================ */
.section--partners {
    background: var(--color-white);
    padding: var(--spacing-xl) 0;
}

.partners__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.partners__item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 200px;
    margin: 0 auto;
    padding: 12px;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.partners__logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: grayscale(100%);
    opacity: 0.6;
    transition: all var(--transition-base);
}

.partners__item:hover .partners__logo {
    filter: grayscale(0%);
    opacity: 1;
    transform: scale(1.1);
}

/* ============================================
   Contact - 联系我们区块
   ============================================ */
.section--contact {
    background: var(--color-gray);
}

.contact__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.contact__map {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.contact__map iframe {
    display: block;
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: 24px;
    padding: 20px 0;
}

.contact__info-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact__info-item svg {
    flex-shrink: 0;
    margin-top: 6px;
}

.contact__info-text {
    flex: 1;
}

.contact__info-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.contact__info-value {
    font-size: 16px;
    color: var(--color-text);
    line-height: 1.6;
}

.contact__link {
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

.contact__link:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

/* ============================================
   Footer - 底部版权
   ============================================ */
.footer {
    background: var(--color-footer-bg);
    color: var(--color-text-light);
    padding: 24px 0;
    text-align: center;
}

.footer__text {
    font-size: 14px;
    line-height: 1.6;
}

.footer__separator {
    margin: 0 12px;
    color: var(--color-text-light);
}

/* ============================================
   Back to Top - 回到顶部按钮
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 999;
    cursor: pointer;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ============================================
   Responsive - 响应式设计
   ============================================ */

/* Tablet: 1024px */
@media (max-width: 1024px) {
    :root {
        --container-padding: 20px;
    }
    
    .navbar__menu {
        gap: 24px;
        margin-left: 32px;
    }
    
    .partners__grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .about__intro {
        grid-template-columns: 280px 1fr;
        gap: 32px;
    }
    
    .about__image {
        width: 280px;
        height: 210px;
    }
}

/* Mobile Landscape: 768px */
@media (max-width: 768px) {
    :root {
        --container-padding: 16px;
        --navbar-height: 56px;
    }
    
    .navbar__menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero {
        height: 400px;
    }
    
    .hero__title {
        font-size: 24px;
    }
    
    .hero__subtitle {
        font-size: 14px;
    }
    
    .btn--large {
        padding: 12px 28px;
        font-size: 16px;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .section__title {
        font-size: 26px;
        margin-bottom: 32px;
    }
    
    .popular__tabs {
        justify-content: flex-start;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 16px;
        padding-bottom: 0;
        scrollbar-width: none;
    }
    
    .popular__tabs::-webkit-scrollbar {
        display: none;
    }
    
    .popular__tab {
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .popular__panel-inner {
        grid-template-columns: 1fr;
    }
    
    .popular__image-wrapper {
        height: 240px;
    }
    
    .popular__content {
        padding: 24px;
    }
    
    .popular__category-title {
        font-size: 22px;
    }
    
    .about__intro {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .about__intro-image {
        max-width: 320px;
        margin: 0 auto;
    }
    
    .about__image {
        width: 100%;
        height: 240px;
    }
    
    .about__promises {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .about__advantages {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .partners__grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }
    
    .partners__item {
        width: 140px;
    }
    
    .contact__inner {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .contact__map iframe {
        height: 280px;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
}

/* Mobile Portrait: 375px */
@media (max-width: 375px) {
    :root {
        --container-padding: 12px;
    }
    
    .hero {
        height: 320px;
    }
    
    .hero__title {
        font-size: 20px;
    }
    
    .hero__subtitle {
        font-size: 13px;
        margin-bottom: 20px;
    }
    
    .section__title {
        font-size: 22px;
    }
    
    .popular__tabs {
        gap: 12px;
    }
    
    .popular__tab {
        padding: 8px 12px;
        font-size: 13px;
    }
    
    .popular__image-wrapper {
        height: 200px;
    }
    
    .popular__content {
        padding: 20px;
    }
    
    .popular__category-title {
        font-size: 20px;
    }
    
    .popular__features li {
        font-size: 14px;
    }
    
    .partners__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer__text {
        font-size: 12px;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .navbar,
    .mobile-menu,
    .back-to-top,
    .hero__indicators {
        display: none !important;
    }
    
    .hero {
        height: auto;
        margin-top: 0;
    }
    
    .section {
        page-break-inside: avoid;
    }
}