/* ============================================
   全局样式与变量
   ============================================ */
:root {
    --color-bg: #f0f7f0;
    --color-surface: #ffffff;
    --color-primary: #2c7da0;
    --color-primary-dark: #1f5e7a;
    --color-secondary: #7cb083;
    --color-text: #2c3e2f;
    --color-text-light: #5a6e5a;
    --color-border: #e2ece2;
    --color-accent: #e8f5e9;
    --color-success: #4caf50;
    --color-success-text: #2e7d32;
    --color-error: #e53935;
    --color-error-text: #c62828;
    --hero-gradient: linear-gradient(160deg, #e3f0ef 0%, #eaf5ea 40%, #e8f0f4 100%);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.07);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.09);
    --radius: 12px;
    --radius-lg: 16px;
    --container-width: 1200px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    background-image:
        radial-gradient(circle at 20% 50%, rgba(44, 125, 160, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(124, 176, 131, 0.03) 0%, transparent 50%);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background-color: rgba(44, 125, 160, 0.2);
    color: var(--color-primary-dark);
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--color-secondary), var(--color-primary));
    border-radius: 10px;
}

.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============================================
   导航栏
   ============================================ */
.site-header {
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(226, 236, 226, 0.6);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
    position: relative;
}

.logo a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 2px;
    transition: width var(--transition-base);
}

.logo a:hover::after {
    width: 100%;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 0.25rem;
}

.nav-list a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    transition: color var(--transition-base), background-color var(--transition-base);
    position: relative;
}

.nav-list a:hover {
    color: var(--color-primary);
    background-color: rgba(44, 125, 160, 0.06);
}

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

.nav-list a:hover::after {
    width: 40%;
}

.nav-list a.active {
    color: var(--color-primary);
    font-weight: 600;
    background-color: rgba(44, 125, 160, 0.06);
}

.nav-list a.active::after {
    width: 40%;
}

.lang-switch {
    display: flex;
    gap: 0.25rem;
    background-color: rgba(44, 125, 160, 0.06);
    border-radius: 24px;
    padding: 3px;
}

.lang-btn {
    background: none;
    border: none;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    color: var(--color-text-light);
    transition: all var(--transition-base);
    font-weight: 500;
}

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

.lang-btn.active-lang {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 2px 6px rgba(44, 125, 160, 0.25);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text);
    padding: 0.5rem;
    border-radius: 8px;
    transition: background-color var(--transition-base);
}

.menu-toggle:hover {
    background-color: rgba(44, 125, 160, 0.06);
}

/* 移动端导航菜单 */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    .nav-list {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        box-shadow: var(--shadow-lg);
        padding: 0.5rem 0;
        gap: 0;
        z-index: 99;
        border-bottom: 1px solid var(--color-border);
    }
    .nav-list.active {
        display: flex;
    }
    .nav-list li {
        text-align: center;
    }
    .nav-list a {
        display: block;
        padding: 0.85rem 1.5rem;
        border-radius: 0;
    }
    .nav-list a::after {
        display: none;
    }
    .main-nav {
        gap: 1rem;
    }
    .lang-switch {
        margin-left: auto;
    }
}

/* ============================================
   按钮样式
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    border-radius: 40px;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    background-color: transparent;
    font-size: 0.95rem;
    letter-spacing: 0.01em;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 4px 14px rgba(44, 125, 160, 0.2);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    box-shadow: 0 6px 20px rgba(44, 125, 160, 0.3);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(44, 125, 160, 0.2);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
    padding: 6rem 0 4rem;
    text-align: center;
    background: var(--hero-gradient);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(44, 125, 160, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(124, 176, 131, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 2.75rem;
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-light);
    margin-bottom: 2rem;
    font-weight: 400;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-bar {
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    margin: 1.5rem auto;
    border-radius: 3px;
}

.hero-compact {
    padding: 3.5rem 0 2rem;
}

/* ============================================
   简介区域（首页可选的文字）
   ============================================ */
.intro {
    padding: 3.5rem 0;
    text-align: center;
    background-color: var(--color-surface);
    margin-top: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.intro-text {
    font-size: 1.15rem;
    max-width: 700px;
    margin: 0 auto;
    color: var(--color-text-light);
    line-height: 1.8;
}

main > section:last-of-type:not(.intro) {
    padding-bottom: 3rem;
}

/* ============================================
   页脚
   ============================================ */
.site-footer {
    background-color: var(--color-surface);
    padding: 2.5rem 0;
    margin-top: 3rem;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.site-footer p {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-link {
    color: var(--color-text-light);
    text-decoration: none;
    transition: color var(--transition-base);
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

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

/* 响应式页脚 */
@media (max-width: 600px) {
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
    .footer-links {
        gap: 1.5rem;
    }
}

/* ============================================
   动态效果：淡入滚动
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* stagger animation for children when parent is visible */
.fade-in.visible > .card,
.fade-in.visible > .gallery-img,
.fade-in.visible > .gallery-item {
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) both;
}

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

/* 为其他页面预留的卡片通用样式 */
.card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base),
                box-shadow var(--transition-base);
    border: 1px solid rgba(226, 236, 226, 0.5);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.card:hover::before {
    opacity: 1;
}

/* 网格布局工具 */
.grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

/* 通用辅助 */
.text-center { text-align: center; }
.mt-2 { margin-top: 1rem; }
.mb-2 { margin-bottom: 1rem; }

/* 打字机效果标题的字体 */
#typing-title {
    font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.project-links {
    display: flex;
    flex-wrap: nowrap;
    gap: 1.5rem;
    justify-content: center;
}

/* 摄影网格图片样式 */
.gallery-item {
    display: block;
    overflow: hidden;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base),
                box-shadow var(--transition-base);
    position: relative;
}

.gallery-item::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 60%, rgba(0,0,0,0.35) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    border-radius: var(--radius-lg);
}

.gallery-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.gallery-item:hover::after {
    opacity: 1;
}

.gallery-item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.gallery-item:hover img {
    transform: scale(1.06);
}

/* 摄影网格图片样式（原生模态框用） */
.gallery-img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: transform var(--transition-base),
                box-shadow var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.gallery-img:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

/* 如下为需要换行的元素 */
[data-i18n="intro_text"],
[data-i18n="about_text"] {
    white-space: pre-wrap;
}

/* ============================================
   关于页：头像效果
   ============================================ */
.about-card {
    max-width: 800px;
    margin: 0 auto;
}

.about-avatar {
    text-align: center;
    margin-bottom: 2rem;
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.7;
}

.about-avatar img {
    transition: transform var(--transition-smooth),
                box-shadow var(--transition-smooth);
    box-shadow: 0 4px 20px rgba(44, 125, 160, 0.15);
}

.about-avatar img:hover {
    transform: scale(1.04);
    box-shadow: 0 8px 32px rgba(44, 125, 160, 0.22);
}

/* ============================================
   联系页样式
   ============================================ */
.contact-card {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-email-item {
    margin-bottom: 2rem;
}

.contact-email-icon {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    display: block;
}

.contact-email-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: 1.1rem;
    word-break: break-all;
}

.contact-social-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.contact-social-icon {
    width: 2.4rem;
    height: 2.4rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.contact-section-title {
    margin-bottom: 0.5rem;
}

.contact-social-label {
    margin-bottom: 1rem;
    color: var(--color-text-light);
}

.contact-social-list {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.contact-social-icon-img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.contact-social-icon-img:hover {
    transform: scale(1.15);
}

.contact-item i {
    transition: transform var(--transition-base);
}

.contact-link {
    transition: color var(--transition-base);
}

.contact-link:hover {
    color: var(--color-primary) !important;
}

.social-links a.social-icon:hover {
    color: var(--color-primary) !important;
    transform: translateY(-3px);
    display: inline-block;
    transition: all var(--transition-base);
}

/* ============================================
   模态框优化
   ============================================ */
#image-modal {
    animation: modalFadeIn 0.3s ease;
}

#image-modal img {
    border-radius: 8px;
    box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ============================================
   足迹页面：地球容器
   ============================================ */
.footprint-globe-section {
    padding: 0 0 3rem;
}

#globe-container {
    width: 100%;
    height: 600px;
    min-height: 300px;
    max-height: 85vh;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: radial-gradient(ellipse at center, #1a2a3a 0%, #0d1520 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

#globe-container canvas {
    display: block;
    margin: 0 auto;
}

.scene-tooltip {
    display: none !important;
}

.globe-tooltip {
    position: fixed;
    pointer-events: none;
    opacity: 0;
    z-index: 999;
    transform: translate(-50%, -100%);
    transition: opacity 0.15s ease;
}

.globe-tooltip-inner {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: var(--color-text);
    padding: 0.65rem 1rem;
    border-radius: 14px;
    font-size: 0.92rem;
    line-height: 1.5;
    white-space: nowrap;
    box-shadow: 0 6px 28px rgba(0,0,0,0.12), 0 0 0 0.5px rgba(0,0,0,0.06);
    text-align: center;
    position: relative;
}

.globe-tooltip-inner::after {
    content: '';
    position: absolute;
    bottom: -7px;
    left: 50%;
    transform: translateX(-50%);
    width: 14px;
    height: 14px;
    background: rgba(255, 255, 255, 0.96);
    clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.globe-tooltip-place {
    display: block;
    font-weight: 700;
    color: var(--color-primary);
    font-size: 0.95rem;
    margin-bottom: 0.2rem;
}

.globe-tooltip-meta {
    display: block;
    color: var(--color-text-light);
    font-size: 0.78rem;
}

/* ============================================
   足迹页面：旅行日志时间轴
   ============================================ */
.footprint-log-section {
    padding: 0 0 4rem;
}

.section-heading {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    text-align: center;
    margin-bottom: 2rem;
    position: relative;
}

.section-heading::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 3px;
    margin: 0.75rem auto 0;
}

.footprint-timeline {
    max-width: 600px;
    margin: 0 auto;
}

.footprint-card {
    display: flex;
    align-items: flex-start;
    gap: 1.25rem;
    margin-bottom: 1.25rem;
    padding: 1.25rem 1.5rem;
    animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.footprint-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 0.4rem;
    box-shadow: 0 0 0 4px rgba(44, 125, 160, 0.15);
    animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
    0%, 100% {
        box-shadow: 0 0 0 4px rgba(44, 125, 160, 0.15);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(44, 125, 160, 0.05);
    }
}

.footprint-card-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
    color: var(--color-text);
}

.footprint-meta {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.footprint-meta i {
    color: var(--color-primary);
    margin-right: 0.2rem;
}

/* ============================================
   响应式优化
   ============================================ */
@media (max-width: 768px) {
    .hero {
        padding: 4rem 0 3rem;
    }
    .hero-title {
        font-size: 2rem;
    }
    .hero-buttons {
        gap: 1rem;
    }
    .hero::before,
    .hero::after {
        width: 300px;
        height: 300px;
    }
    .grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
        gap: 1.5rem;
    }
    .card {
        padding: 1.5rem;
    }
    #typing-title {
        font-size: 1.3rem;
    }
    .intro {
        padding: 2rem 0;
    }
    .globe-tooltip-inner {
        font-size: 0.8rem;
        padding: 0.5rem 0.75rem;
    }
    .gallery-img,
    .gallery-item img {
        height: 240px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    .btn {
        width: 100%;
        max-width: 260px;
        text-align: center;
    }
    .grid {
        grid-template-columns: 1fr;
    }
    .project-links {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }
    .project-links .btn {
        width: 100%;
        max-width: 220px;
        text-align: center;
    }
    .about-avatar img {
        width: 150px !important;
        height: 150px !important;
    }
    .footprint-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 0.75rem;
    }
    .footprint-dot {
        margin-top: 0;
    }
    .gallery-img,
    .gallery-item img {
        height: 200px;
    }
}