/* ============================================
   香港深海药业有限公司 - 海洋深蓝风格样式表
   Hong Kong DeepSea Pharmaceutical
   主色调：深海蓝 + 青绿 + 浪花白
   ============================================ */

/* ===== CSS 变量定义：海洋色彩系统 ===== */
:root {
    --color-deep: #001f3f;        /* 深海蓝 - 最深 */
    --color-ocean: #003366;       /* 海洋蓝 - 主色 */
    --color-mid: #006994;         /* 中海蓝 */
    --color-teal: #008080;        /* 青绿色 */
    --color-cyan: #00CED1;        /* 亮青绿 - 强调色 */
    --color-foam: #f0f9ff;        /* 浪花白 */
    --color-sand: #e8f4f8;        /* 浅水白 */
    --color-dark: #000814;        /* 深渊黑蓝 */
    --color-text: #e0f7fa;        /* 文字浅色 */
    --color-text-dark: #001a33;   /* 文字深色 */
    --color-muted: #8ab4c7;       /* 静音文字 */

    --font-sans: 'Source Sans Pro', 'Noto Sans SC', sans-serif;
    --font-sc: 'Noto Sans SC', sans-serif;

    --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ===== 全局重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sc);
    background: var(--color-deep);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
    /* 海洋波纹渐变背景 */
    background: linear-gradient(180deg,
        var(--color-dark) 0%,
        var(--color-deep) 20%,
        var(--color-ocean) 60%,
        var(--color-mid) 100%);
    background-attachment: fixed;
}

/* 通用容器 */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 通用区块 */
.section {
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

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

ul {
    list-style: none;
}

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

/* ===== 区块标题样式 ===== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    letter-spacing: 4px;
    color: var(--color-cyan);
    text-transform: uppercase;
    margin-bottom: 12px;
    font-weight: 600;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-foam);
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

/* 标题下波浪装饰 */
.section-wave {
    width: 80px;
    height: 4px;
    margin: 0 auto;
    background: linear-gradient(90deg, transparent, var(--color-cyan), transparent);
    border-radius: 2px;
    position: relative;
}

.section-wave::after {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--color-cyan);
    border-radius: 50%;
    opacity: 0.3;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translateX(-50%) scale(0.8); opacity: 0.3; }
    50% { transform: translateX(-50%) scale(1.2); opacity: 0.6; }
}

/* ===== 波浪分隔符 ===== */
.wave-divider {
    position: absolute;
    left: 0;
    width: 100%;
    height: 80px;
    line-height: 0;
    z-index: 2;
}

.wave-divider svg {
    width: 100%;
    height: 100%;
    display: block;
}

.wave-divider-top {
    top: -1px;
}

.wave-divider-bottom {
    bottom: -1px;
}

/* ============================================
   模块1：导航栏
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
    background: rgba(0, 31, 63, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 206, 209, 0.15);
}

/* 滚动后导航栏样式 */
.header.scrolled {
    background: rgba(0, 8, 20, 0.95);
    box-shadow: 0 4px 30px rgba(0, 206, 209, 0.1);
}

.navbar {
    padding: 15px 0;
}

.nav-container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo 样式 */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
}

.logo-icon {
    width: 42px;
    height: 42px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.logo-text {
    font-size: 1.4rem;
    color: var(--color-foam);
    font-weight: 700;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--color-cyan), var(--color-foam));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    gap: 8px;
    align-items: center;
}

.nav-link {
    padding: 10px 18px;
    color: var(--color-text);
    font-size: 1rem;
    font-weight: 500;
    border-radius: 30px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

/* 水波纹 hover 效果 */
.nav-link::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(0, 206, 209, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
    z-index: -1;
}

.nav-link:hover::before,
.nav-link.active::before {
    width: 200px;
    height: 200px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-cyan);
}

.nav-contact-btn {
    background: linear-gradient(135deg, var(--color-teal), var(--color-cyan));
    color: var(--color-dark) !important;
    font-weight: 600;
}

.nav-contact-btn:hover {
    box-shadow: 0 0 20px rgba(0, 206, 209, 0.5);
    transform: translateY(-2px);
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.bar {
    width: 28px;
    height: 3px;
    background: var(--color-cyan);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

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

.hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ============================================
   模块2：全屏轮播图
   ============================================ */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
}

.hero-carousel {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    /* 波浪式滑动转场 */
    clip-path: polygon(0 100%, 100% 100%, 100% 100%, 0 100%);
    transition: clip-path 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                opacity 1.2s ease;
}

.hero-slide.active {
    opacity: 1;
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

/* 轮播图遮罩 */
.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg,
        rgba(0, 31, 63, 0.85) 0%,
        rgba(0, 51, 102, 0.6) 50%,
        rgba(0, 105, 148, 0.4) 100%);
}

/* 轮播图内容 */
.hero-content {
    position: relative;
    z-index: 5;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 900;
    color: var(--color-foam);
    margin-bottom: 25px;
    text-shadow: 0 4px 30px rgba(0, 206, 209, 0.4);
    animation: fadeInUp 1s ease 0.3s both;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.4rem);
    color: var(--color-sand);
    margin-bottom: 40px;
    animation: fadeInUp 1s ease 0.6s both;
}

.hero-btn {
    display: inline-block;
    padding: 16px 45px;
    background: linear-gradient(135deg, var(--color-cyan), var(--color-teal));
    color: var(--color-dark);
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 50px;
    letter-spacing: 2px;
    animation: fadeInUp 1s ease 0.9s both;
    transition: var(--transition);
    box-shadow: 0 8px 30px rgba(0, 206, 209, 0.3);
}

.hero-btn:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 15px 40px rgba(0, 206, 209, 0.6);
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 轮播图控制点 */
.carousel-dots {
    position: absolute;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 10;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.dot.active {
    background: var(--color-cyan);
    border-color: var(--color-foam);
    transform: scale(1.3);
    box-shadow: 0 0 15px var(--color-cyan);
}

/* 上升气泡装饰 */
.bubbles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 3;
    overflow: hidden;
}

.bubble {
    position: absolute;
    bottom: -50px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%,
        rgba(255, 255, 255, 0.4),
        rgba(0, 206, 209, 0.15));
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: bubbleUp linear infinite;
}

@keyframes bubbleUp {
    0% {
        bottom: -50px;
        opacity: 0;
        transform: translateX(0);
    }
    10% { opacity: 0.8; }
    50% { transform: translateX(30px); }
    80% { transform: translateX(-20px); }
    100% {
        bottom: 110%;
        opacity: 0;
        transform: translateX(20px);
    }
}

/* ============================================
   模块3：关于我们
   ============================================ */
.about {
    background: var(--color-deep);
    padding-bottom: 120px;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
    margin-bottom: 80px;
}

.about-text {
    padding: 20px 0;
}

.about-desc {
    font-size: 1.1rem;
    color: var(--color-text);
    margin-bottom: 25px;
    line-height: 2;
}

.about-image {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 206, 209, 0.2);
}

.about-image img {
    width: 100%;
    height: 350px;
    object-fit: cover;
    transition: var(--transition-slow);
}

.about-image:hover img {
    transform: scale(1.08);
}

.image-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background: linear-gradient(transparent, rgba(0, 31, 63, 0.8));
}

/* 统计数据 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item {
    padding: 35px 20px;
    background: rgba(0, 51, 102, 0.3);
    border-radius: 20px;
    border: 1px solid rgba(0, 206, 209, 0.2);
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.stat-item:hover {
    transform: translateY(-10px);
    border-color: var(--color-cyan);
    box-shadow: 0 15px 40px rgba(0, 206, 209, 0.2);
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-cyan);
    font-family: var(--font-sans);
    line-height: 1;
    margin-bottom: 10px;
    text-shadow: 0 0 20px rgba(0, 206, 209, 0.4);
}

.stat-label {
    color: var(--color-sand);
    font-size: 1rem;
    font-weight: 500;
}

/* ============================================
   模块4：服务介绍
   ============================================ */
.services {
    background: linear-gradient(180deg, var(--color-ocean) 0%, var(--color-deep) 100%);
    padding-top: 140px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.service-card {
    padding: 40px 25px;
    background: rgba(0, 31, 63, 0.5);
    border-radius: 20px;
    border: 1px solid rgba(0, 206, 209, 0.15);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

/* 服务卡片波浪 hover 效果 */
.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
        transparent,
        rgba(0, 206, 209, 0.1),
        transparent);
    transition: left 0.8s ease;
}

.service-card:hover::before {
    left: 100%;
}

.service-card:hover {
    transform: translateY(-15px);
    border-color: var(--color-cyan);
    box-shadow: 0 20px 50px rgba(0, 206, 209, 0.25);
    background: rgba(0, 105, 148, 0.3);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    transition: var(--transition);
}

.service-card:hover .service-icon {
    transform: rotate(10deg) scale(1.1);
}

.service-title {
    font-size: 1.4rem;
    color: var(--color-foam);
    margin-bottom: 15px;
    font-weight: 700;
}

.service-desc {
    color: var(--color-text);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* ============================================
   模块5：客户案例
   ============================================ */
.cases {
    background: var(--color-deep);
    padding-bottom: 120px;
}

.cases-carousel {
    position: relative;
    overflow: hidden;
    padding: 20px 0;
}

.cases-track {
    display: flex;
    gap: 25px;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.case-card {
    min-width: calc(25% - 19px);
    background: rgba(0, 51, 102, 0.4);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid rgba(0, 206, 209, 0.15);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-10px);
    border-color: var(--color-cyan);
    box-shadow: 0 20px 50px rgba(0, 206, 209, 0.2);
}

.case-image {
    width: 100%;
    height: 240px;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.case-card:hover .case-image img {
    transform: scale(1.1);
}

.case-info {
    padding: 25px;
}

.case-name {
    font-size: 1.3rem;
    color: var(--color-cyan);
    margin-bottom: 8px;
}

.case-age {
    color: var(--color-muted);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.case-text {
    color: var(--color-text);
    font-size: 0.95rem;
    line-height: 1.7;
    font-style: italic;
}

/* 案例轮播按钮 */
.case-prev,
.case-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(0, 206, 209, 0.2);
    border: 2px solid var(--color-cyan);
    color: var(--color-cyan);
    font-size: 2rem;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    line-height: 1;
}

.case-prev:hover,
.case-next:hover {
    background: var(--color-cyan);
    color: var(--color-dark);
    box-shadow: 0 0 20px var(--color-cyan);
}

.case-prev { left: 10px; }
.case-next { right: 10px; }

/* ============================================
   模块6：新闻资讯
   ============================================ */
.news {
    background: linear-gradient(180deg, var(--color-deep) 0%, var(--color-ocean) 100%);
    padding-top: 140px;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.news-card {
    display: flex;
    gap: 20px;
    padding: 30px;
    background: rgba(0, 31, 63, 0.5);
    border-radius: 20px;
    border: 1px solid rgba(0, 206, 209, 0.15);
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.news-card:hover {
    transform: translateY(-10px);
    border-color: var(--color-cyan);
    box-shadow: 0 15px 40px rgba(0, 206, 209, 0.2);
}

.news-date {
    flex-shrink: 0;
    text-align: center;
    padding: 15px 10px;
    background: linear-gradient(135deg, var(--color-teal), var(--color-cyan));
    border-radius: 15px;
    min-width: 70px;
    color: var(--color-dark);
}

.news-day {
    display: block;
    font-size: 2rem;
    font-weight: 900;
    line-height: 1;
    font-family: var(--font-sans);
}

.news-month {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    margin-top: 5px;
}

.news-content {
    flex: 1;
}

.news-title {
    font-size: 1.1rem;
    color: var(--color-foam);
    margin-bottom: 12px;
    line-height: 1.5;
    font-weight: 700;
}

.news-excerpt {
    color: var(--color-text);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 15px;
}

.news-link {
    color: var(--color-cyan);
    font-size: 0.9rem;
    font-weight: 600;
}

.news-link:hover {
    letter-spacing: 1px;
}

/* ============================================
   模块7：常见问题 FAQ
   ============================================ */
.faq {
    background: var(--color-ocean);
    padding-bottom: 120px;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 15px;
    background: rgba(0, 31, 63, 0.5);
    border-radius: 15px;
    border: 1px solid rgba(0, 206, 209, 0.15);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(0, 206, 209, 0.4);
}

.faq-item.active {
    border-color: var(--color-cyan);
    box-shadow: 0 10px 30px rgba(0, 206, 209, 0.15);
}

.faq-question {
    width: 100%;
    padding: 22px 25px;
    background: none;
    border: none;
    color: var(--color-foam);
    font-size: 1.05rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-sc);
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--color-cyan);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--color-cyan);
    transition: transform 0.4s ease;
    flex-shrink: 0;
    margin-left: 15px;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.faq-answer p {
    padding: 0 25px 22px;
    color: var(--color-text);
    line-height: 1.9;
}

/* ============================================
   模块8：联系我们
   ============================================ */
.contact {
    background: linear-gradient(180deg, var(--color-ocean) 0%, var(--color-deep) 100%);
    padding-top: 140px;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 50px;
    align-items: start;
}

/* 联系信息 */
.contact-info {
    padding: 40px;
    background: rgba(0, 31, 63, 0.5);
    border-radius: 20px;
    border: 1px solid rgba(0, 206, 209, 0.15);
    backdrop-filter: blur(10px);
}

.contact-info-title {
    font-size: 1.6rem;
    color: var(--color-foam);
    margin-bottom: 5px;
}

.contact-info-en {
    color: var(--color-cyan);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    margin-bottom: 30px;
    letter-spacing: 1px;
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.contact-icon {
    font-size: 1.3rem;
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 206, 209, 0.15);
    border-radius: 50%;
}

.contact-item strong {
    display: block;
    color: var(--color-cyan);
    margin-bottom: 4px;
    font-size: 0.95rem;
}

.contact-item p {
    color: var(--color-text);
    font-size: 0.95rem;
}

.contact-item a:hover {
    color: var(--color-cyan);
}

/* 联系表单 */
.contact-form-wrapper {
    padding: 40px;
    background: rgba(0, 31, 63, 0.5);
    border-radius: 20px;
    border: 1px solid rgba(0, 206, 209, 0.15);
    backdrop-filter: blur(10px);
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    color: var(--color-foam);
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 0.95rem;
}

.required {
    color: var(--color-cyan);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background: rgba(0, 8, 20, 0.5);
    border: 1px solid rgba(0, 206, 209, 0.2);
    border-radius: 10px;
    color: var(--color-foam);
    font-size: 1rem;
    font-family: var(--font-sc);
    transition: var(--transition);
    resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-cyan);
    box-shadow: 0 0 15px rgba(0, 206, 209, 0.2);
}

/* 表单验证错误样式 */
.form-group input.error,
.form-group textarea.error {
    border-color: #ff6b6b;
    box-shadow: 0 0 10px rgba(255, 107, 107, 0.2);
}

.form-error {
    display: block;
    color: #ff8888;
    font-size: 0.85rem;
    margin-top: 5px;
    min-height: 18px;
}

.form-submit-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--color-teal), var(--color-cyan));
    color: var(--color-dark);
    font-size: 1.1rem;
    font-weight: 700;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 2px;
}

.form-submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 206, 209, 0.4);
}

.form-success {
    display: none;
    text-align: center;
    color: var(--color-cyan);
    margin-top: 15px;
    font-weight: 600;
    padding: 15px;
    background: rgba(0, 206, 209, 0.1);
    border-radius: 10px;
    border: 1px solid var(--color-cyan);
}

.form-success.show {
    display: block;
    animation: fadeInUp 0.5s ease;
}

/* ============================================
   模块9：友情链接 + 页脚
   ============================================ */
.footer {
    background: var(--color-dark);
    padding-top: 100px;
    position: relative;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 50px;
}

.footer-section {
    padding: 10px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.footer-desc {
    color: var(--color-text);
    line-height: 1.8;
    font-size: 0.95rem;
}

.footer-title {
    color: var(--color-foam);
    font-size: 1.15rem;
    margin-bottom: 20px;
    font-weight: 700;
    position: relative;
    padding-bottom: 12px;
}

.footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--color-cyan);
}

.footer-links li,
.footer-contact li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--color-text);
    font-size: 0.95rem;
    transition: var(--transition);
    display: inline-block;
}

.footer-links a:hover {
    color: var(--color-cyan);
    transform: translateX(8px);
}

.footer-contact li {
    color: var(--color-text);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 页脚版权 */
.footer-bottom {
    text-align: center;
    padding: 25px 0;
    border-top: 1px solid rgba(0, 206, 209, 0.15);
    color: var(--color-muted);
    font-size: 0.9rem;
}

/* ============================================
   回到顶部按钮
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-teal), var(--color-cyan));
    color: var(--color-dark);
    border: none;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 5px 20px rgba(0, 206, 209, 0.4);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 206, 209, 0.6);
}

/* ============================================
   IntersectionObserver 滚动动画
   ============================================ */
.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   响应式设计 - 平板
   ============================================ */
@media (max-width: 992px) {
    .section { padding: 70px 0; }
    .section-title { font-size: 2rem; }

    .about-content { grid-template-columns: 1fr; gap: 30px; }
    .about-image img { height: 280px; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); }

    .services-grid { grid-template-columns: repeat(2, 1fr); }

    .case-card { min-width: calc(50% - 13px); }

    .news-grid { grid-template-columns: 1fr; }

    .contact-content { grid-template-columns: 1fr; }

    .footer-content { grid-template-columns: 1fr 1fr; gap: 30px; }
}

/* ============================================
   响应式设计 - 移动端
   ============================================ */
@media (max-width: 768px) {
    /* 移动端导航菜单 */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        flex-direction: column;
        background: rgba(0, 8, 20, 0.98);
        backdrop-filter: blur(15px);
        padding: 90px 30px 30px;
        gap: 15px;
        transition: right 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        box-shadow: -10px 0 40px rgba(0, 0, 0, 0.5);
        align-items: stretch;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-link {
        display: block;
        padding: 15px 20px;
        border-radius: 10px;
        background: rgba(0, 51, 102, 0.3);
    }

    .hamburger {
        display: flex;
    }

    /* 轮播图 */
    .hero { min-height: 500px; }
    .carousel-dots { bottom: 100px; }

    /* 关于我们 */
    .about { padding-bottom: 80px; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 15px; }
    .stat-number { font-size: 2.2rem; }
    .stat-item { padding: 25px 15px; }

    /* 服务 */
    .services { padding-top: 100px; }
    .services-grid { grid-template-columns: 1fr; }

    /* 案例 */
    .case-card { min-width: calc(100% - 0px); }

    /* 联系 */
    .contact { padding-top: 100px; }
    .contact-info, .contact-form-wrapper { padding: 25px; }

    /* 页脚 */
    .footer { padding-top: 80px; }
    .footer-content { grid-template-columns: 1fr; gap: 30px; }

    .back-to-top { bottom: 20px; right: 20px; width: 45px; height: 45px; }
}

/* ============================================
   响应式设计 - 小屏手机
   ============================================ */
@media (max-width: 480px) {
    .container { width: 95%; }
    .section { padding: 50px 0; }
    .section-title { font-size: 1.7rem; }

    .hero-title { font-size: 2rem; }
    .hero-subtitle { font-size: 0.95rem; }
    .hero-btn { padding: 14px 30px; font-size: 1rem; }

    .stats-grid { grid-template-columns: 1fr; }
    .stat-number { font-size: 2rem; }

    .news-card { flex-direction: column; gap: 15px; }
    .news-date { display: flex; gap: 10px; align-items: center; justify-content: center; min-width: auto; }
}