/* ============================================
   张天乙个人主页 - 统一样式表
   合并自: 个人网页old/website/style.css + 内嵌样式优化
   ============================================ */

/* ---------- 基础重置与变量 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

:root {
    --primary: #3D55A7;
    --primary-dark: #1D3897;
    --secondary: #F0F2FC;
    --accent: #FF6B6B;
    --text: #333;
    --light: #fff;
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e7f1 100%);
    color: var(--text);
    overflow-x: hidden;
    line-height: 1.6;
    padding-bottom: 20px;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ---------- 顶部标题区域 ---------- */
header {
    background: linear-gradient(to right, var(--primary-dark), var(--primary));
    color: var(--light);
    padding: 0;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    overflow: visible;
}

header::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 70%);
    transform: rotate(30deg);
    pointer-events: none;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-section img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.3);
}

.title-section h1 {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.3;
    white-space: nowrap;
    padding: 16px 0;
}

.slogan-section img {
    height: 50px;
    opacity: 0.9;
}

.slogan-text {
    font-size: 1.6rem;
    font-weight: 500;
    letter-spacing: 0.3em;
    opacity: 0.85;
    color: var(--light);
}

/* ---------- 导航栏（位于 header 内） ---------- */

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--light);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 15px;
}

.nav-ul {
    display: flex;
    list-style: none;
}

.nav-ul li {
    position: relative;
}

.nav-ul a {
    display: block;
    padding: 18px 20px;
    color: var(--light);
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-ul a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-ul a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 4px;
    background: var(--accent);
    transform: translateX(-50%);
    transition: var(--transition);
    border-radius: 2px;
}

.nav-ul a:hover::after {
    width: 80%;
}

.nav-ul-li-active {
    background-color: var(--primary-dark);
}

.nav-ul-li-active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 80%;
    height: 4px;
    background: var(--accent);
    transform: translateX(-50%);
    border-radius: 2px;
}

/* ---------- 下拉菜单 ---------- */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropbtn {
    display: block;
    padding: 10px 20px;
    color: white;
    text-decoration: none;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #ffffff;
    min-width: 120px;
    box-shadow: 0px 8px 16px rgba(0,0,0,0.2);
    z-index: 1000;
}

.dropdown-content a {
    color: #333;
    padding: 10px 15px;
    text-decoration: none;
    display: block;
    font-size: 15px;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a:hover {
    background-color: #f1f1f1;
}

.dropdown-content a.nav-ul-li-active {
    background-color: var(--primary-dark);
    color: var(--light);
}

.nav-ul .nav-ul-li-active,
.dropbtn:hover {
    background-color: #4a90e2;
}

.dropdown-content.show {
    display: block !important;
    position: static;
    background-color: var(--primary);
    box-shadow: none;
    padding-left: 0;
    padding-right: 0;
}

.dropdown-content a.chosen {
    background-color: var(--primary-dark);
    border-bottom: 3px solid rgba(0, 0, 0, 0.08);
    color: white;
}

/* ---------- 主要内容区域 ---------- */
main {
    padding: 25px 0 0 0;
    margin-top: 30px;
}

/* ===== 页面第一行：左半个人照片+链接 + 右半个人信息卡 ===== */
.hero-section {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
}

/* ---------- 左半：个人照片 + 链接 ---------- */
.hero-profile {
    flex: 0 0 auto;
    width: 160px;
    background: transparent;
    box-shadow: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.hero-profile img {
    width: 160px;
    height: 160px;
    border-radius: 16px;
    object-fit: cover;
    border: 3px solid var(--secondary);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

/* 竖排链接 */
.social-links-vertical {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 100%;
}

.social-links-vertical a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 10px;
    border-radius: 8px;
    background: transparent;
    color: var(--primary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
}

.social-links-vertical a i {
    width: 22px;
    text-align: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.social-links-vertical a span {
    color: var(--text);
}

.social-links-vertical a:hover {
    background: rgba(61, 85, 167, 0.08);
    color: var(--primary);
    transform: translateX(3px);
}

.social-links-vertical a:hover span {
    color: var(--primary);
}

.social-links-vertical .social-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 10px;
    border-radius: 8px;
    background: transparent;
    color: var(--primary);
    font-size: 0.95rem;
    font-weight: 500;
}

.social-links-vertical .social-item i {
    width: 22px;
    text-align: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.social-links-vertical .social-item span {
    color: var(--text);
}

/* ---------- 右半：个人信息卡 ---------- */
.hero-info {
    flex: 1;
    min-width: 0;
    background: var(--light);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 25px;
    display: flex;
    align-items: center;
}

.hero-info-right {
    flex: 1;
    min-width: 0;
}

.hero-info-right .intro-text {
    font-size: 1.05rem;
    color: var(--text);
    line-height: 1.8;
    margin-bottom: 16px;
    padding-left: 10px;
    border-left: 3px solid var(--primary);
    text-align: justify;
}

.hero-info-right .intro-text:last-child {
    margin-bottom: 0;
}

.hero-info-right .intro-list {
    font-size: 1.05rem;
    color: var(--text);
    line-height: 1.8;
    margin: 16px 0;
    padding-left: 30px;
    list-style: disc;
}

.hero-info-right .intro-list li {
    margin-bottom: 12px;
    text-align: justify;
}

.hero-info-right .intro-list li:last-child {
    margin-bottom: 0;
}

.hero-info-right .detail-item {
    display: flex;
    align-items: center;
    margin: 10px 0;
    padding-left: 10px;
    border-left: 3px solid var(--primary);
}

.hero-info-right .detail-item i {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--secondary);
    color: var(--primary);
    border-radius: 50%;
    margin-right: 12px;
    font-size: 1rem;
    flex-shrink: 0;
}

.hero-info-right .detail-item p {
    font-size: 1.1rem;
    color: var(--text);
}

/* ---------- 新闻和链接部分 ---------- */
.content-section {
    background: var(--light);
    border-radius: 20px;
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 20px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 25px;
    background: linear-gradient(to right, var(--primary), var(--primary-dark));
    color: var(--light);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
}

.section-link {
    color: var(--light);
    text-decoration: none;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.section-link:hover {
    color: var(--accent);
}

.section-content {
    padding: 20px 25px;
}

/* ---------- 研究内容左右布局 ---------- */
.research-row {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
    align-items: flex-start;
}

.research-row:last-child {
    margin-bottom: 0;
}

.research-image {
    flex: 0 0 320px;
}

.research-image img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.research-text {
    flex: 1;
    min-width: 0;
}

.research-text .news-text {
    text-align: justify;
    line-height: 1.9;
}

.news-item {
    display: flex;
    align-items: flex-start;
    padding: 14px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.news-item:last-child {
    border-bottom: none;
}

.news-icon {
    width: 24px;
    height: 24px;
    margin-right: 15px;
    margin-top: 5px;
    color: var(--primary);
}

.news-content {
    flex: 1;
}

.news-date {
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 5px;
    display: inline-block;
    background: var(--secondary);
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.9rem;
}

.news-text {
    font-size: 1.1rem;
    line-height: 1.5;
}

.news-link {
    text-decoration: none;
    color: inherit;
}

.news-link:hover .news-text {
    color: var(--primary);
    transition: var(--transition);
}

/* ---------- 新闻左右布局 ---------- */
.news-layout {
    display: flex;
    gap: 20px;
    padding: 20px 25px;
}

.news-list {
    flex: 1;
    min-width: 0;
}

/* ---------- 轮播图 ---------- */
.news-carousel {
    flex: 1;
    min-width: 0;
    position: relative;
    overflow: hidden;
    border-radius: 10px;
}

.carousel-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.6s ease-in-out;
    pointer-events: none;
}

.carousel-slide.active {
    opacity: 1;
    pointer-events: auto;
}

.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.7);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--primary);
    transition: var(--transition);
    z-index: 10;
}

.carousel-btn:hover {
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-dark);
}

.carousel-btn.prev {
    left: 10px;
}

.carousel-btn.next {
    right: 10px;
}

.carousel-dots {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 10;
}

.carousel-dots .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: var(--transition);
}

.carousel-dots .dot.active {
    background: var(--light);
    transform: scale(1.2);
}

/* ---------- 邮箱弹窗 ---------- */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-overlay.show {
    display: flex;
}

.modal-box {
    background: var(--light);
    border-radius: 16px;
    padding: 0;
    width: 400px;
    max-width: 90vw;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: linear-gradient(to right, var(--primary-dark), var(--primary));
}

.modal-btn-copy,
.modal-btn-close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--light);
    font-size: 1rem;
    transition: var(--transition);
}

.modal-btn-copy:hover,
.modal-btn-close:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: scale(1.1);
}

.modal-body {
    padding: 30px 24px;
    text-align: center;
    position: relative;
}

.modal-email-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 16px;
}

.modal-email-text {
    font-size: 1.15rem;
    color: var(--text);
    word-break: break-all;
}

.modal-copy-tip {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: var(--light);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.modal-copy-tip.show {
    opacity: 1;
}

.link-item {
    display: flex;
    align-items: center;
    padding: 10px 0;
}

.link-item a {
    display: flex;
    align-items: center;
    color: var(--primary);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    transition: var(--transition);
}

.link-item a:hover {
    color: var(--accent);
    transform: translateX(5px);
}

.link-item i {
    margin-right: 15px;
    font-size: 1.2rem;
    color: var(--primary);
}

/* ---------- 语言切换按钮 ---------- */
.lang-switch a {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    margin-left: 8px;
    padding: 4px 12px !important;
    font-size: 0.95rem !important;
    font-weight: 600 !important;
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: var(--transition);
}

.lang-switch a:hover {
    background: rgba(255, 255, 255, 0.25) !important;
}

@media (max-width: 768px) {
    .lang-switch a {
        margin-left: 0;
        border-radius: 0;
        border: none;
        background: rgba(255, 255, 255, 0.08);
    }
}

/* ---------- 页脚 ---------- */
footer {
    text-align: center;
    padding: 20px 0;
    color: var(--text);
    font-size: 1rem;
    margin-top: 10px;
}

/* ============================================
   响应式设计
   ============================================ */

/* 中等屏幕 (≤992px) */
@media (max-width: 992px) {
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .logo-section {
        justify-content: center;
    }

    .slogan-section {
        margin-top: 10px;
    }
}

/* 小屏幕 / 平板 (≤768px) */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .header-content {
        flex-wrap: nowrap;
    }

    .nav-ul {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 100%;
        left: 0;
        background: var(--primary);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    }

    .nav-ul.active {
        display: flex;
    }

    .nav-ul li {
        width: 100%;
    }

    .nav-ul a {
        padding: 15px 20px;
        text-align: center;
    }

    .hero-section {
        flex-direction: column;
    }

    .hero-info {
        padding: 20px;
    }
}

/* 手机 (≤576px) */
@media (max-width: 576px) {
    .title-section h1 {
        font-size: 1.5rem;
    }

    .slogan-section img {
        height: 40px;
    }

    .slogan-text {
        font-size: 1.3rem;
        letter-spacing: 0.2em;
    }

    .hero-section {
        flex-direction: column;
    }

    .hero-info {
        padding: 12px;
    }

    .hero-profile {
        width: 100%;
        padding: 0;
        flex-direction: row;
        align-items: flex-start;
        gap: 20px;
    }

    .hero-profile img {
        width: 100px;
        height: 100px;
        border-radius: 14px;
        flex-shrink: 0;
    }

    .social-links-vertical {
        flex: 1;
        min-width: 0;
    }

    .hero-info-right .detail-item {
        margin: 8px 0;
    }

    .hero-info-right .detail-item p {
        font-size: 0.95rem;
    }

    .section-header {
        padding: 15px 20px;
    }

    .section-content {
        padding: 20px;
    }

    .news-text {
        font-size: 1rem;
    }

    .news-layout {
        flex-direction: column;
    }

    .carousel-container {
        aspect-ratio: 16 / 9;
    }

    .research-row {
        flex-direction: column;
        gap: 16px;
    }

    .research-image {
        flex: 0 0 auto;
        width: 100%;
    }
}