/* ================= VARIABLES (THEME SYSTEM) ================= */
:root {
    /* --- 默认深色模式 (Dark Mode) --- */
    --bg-body: #0b0c10;
    --bg-card: #1f2833;
    --bg-glass: rgba(11, 12, 16, 0.9);
    --text-main: #c5c6c7;
    --text-bright: #ffffff;
    --accent-color: #66fcf1;
    --accent-hover: #45a29e;
    --border-color: rgba(102, 252, 241, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.5);
    --progress-bg: #2d3436;

    /* 新增：证书区域背景色 (深色模式下用深黑) */
    --cert-bg: #050505;

    --font-primary: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* --- 浅色模式 (Light Mode) --- */
[data-theme="light"] {
    --bg-body: #f4f7f6;
    --bg-card: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.9);
    --text-main: #555555;
    --text-bright: #222222;
    --accent-color: #009688;
    --accent-hover: #00796b;
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.15);
    /* 稍微加深阴影 */
    --progress-bg: #e0e0e0;

    /* 新增：证书区域背景色 (浅色模式下用高级灰，不再用纯黑) */
    --cert-bg: #eef2f5;
}

/* ================= RESET & GLOBAL ================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    font-family: var(--font-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

ul {
    list-style: none;
}

/* ================= HEADER ================= */
header {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 5%;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.3s;
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-bright);
}

.logo .accent {
    color: var(--accent-color);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: var(--text-main);
    font-weight: 500;
    font-size: 1rem;
}

.nav-links a:hover {
    color: var(--accent-color);
}

/* 按钮组样式 */
.nav-buttons {
    display: flex;
    gap: 10px;
    align-items: center;
}

button {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 5px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
    font-size: 0.9rem;
}

button:hover {
    background: var(--accent-color);
    color: var(--bg-body);
}

/* ================= SECTIONS GLOBAL ================= */
section {
    padding: 80px 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.2rem;
    color: var(--text-bright);
    margin-bottom: 50px;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    margin: 10px auto 0;
    border-radius: 2px;
}

/* ================= HERO ================= */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top right, var(--bg-card) 0%, var(--bg-body) 60%);
}

.hero-container {
    display: flex;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-avatar {
    position: relative;
}

.hero-avatar img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 4px solid var(--accent-color);
    box-shadow: 0 0 30px var(--border-color);
}

.status-badge {
    position: absolute;
    bottom: 10px;
    right: -10px;
    background: var(--accent-hover);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.hero-text {
    max-width: 600px;
}

.hero-text h1 {
    font-size: 3rem;
    color: var(--text-bright);
    line-height: 1.2;
}

.hero-text h2 {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin: 10px 0 20px;
    font-weight: 500;
}

.hero-text p {
    font-size: 1.1rem;
    margin-bottom: 30px;
}

.hero-btns {
    display: flex;
    gap: 20px;
}

.btn {
    padding: 12px 30px;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.primary-btn {
    background: var(--accent-color);
    color: var(--bg-body);
}

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

.outline-btn {
    border: 2px solid var(--text-main);
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.outline-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: rgba(0, 0, 0, 0.05);
}

/* ================= SKILLS ================= */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.skill-category {
    background: var(--bg-card);
    padding: 25px;
    border-radius: 12px;
    border-left: 4px solid var(--accent-hover);
    transition: transform 0.3s;
    box-shadow: 0 5px 15px var(--shadow-color);
}

.skill-category:hover {
    transform: translateY(-5px);
}

.skill-category h3 {
    color: var(--text-bright);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.skill-category h3 i {
    color: var(--accent-color);
}

.skill-item {
    margin-bottom: 15px;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--progress-bg);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: 4px;
    width: 0;
    transition: width 1.5s ease-out;
}

/* ================= RESUME ================= */
.resume-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.resume-header {
    color: var(--accent-color);
    margin-bottom: 30px;
    font-size: 1.5rem;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.timeline {
    border-left: 2px solid var(--accent-hover);
    padding-left: 20px;
    margin-left: 10px;
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -27px;
    top: 5px;
    width: 12px;
    height: 12px;
    background: var(--accent-color);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-color);
}

.timeline-item .date {
    display: inline-block;
    background: var(--bg-card);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
    margin-bottom: 5px;
}

.timeline-item h4 {
    color: var(--text-bright);
    font-size: 1.2rem;
    margin: 5px 0;
}

.timeline-item .company {
    color: var(--text-main);
    font-style: italic;
    margin-bottom: 10px;
}

.timeline-item .desc {
    font-size: 0.95rem;
    color: var(--text-main);
    opacity: 0.8;
}

.other-exp-box {
    margin-top: 40px;
    background: var(--bg-card);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--accent-hover);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.other-exp-box h3 {
    color: var(--text-bright);
    margin-bottom: 15px;
}

.other-exp-box ul li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 20px;
    color: var(--text-main);
}

.other-exp-box ul li::before {
    content: '▹';
    color: var(--accent-color);
    position: absolute;
    left: 0;
}

/* ================= CERTIFICATES (OPTIMIZED) ================= */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 25px;
}

.cert-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: 0.3s;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    box-shadow: 0 5px 15px var(--shadow-color);
}

.cert-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
}

/* 
   优化后的图片容器：
   1. 使用 var(--cert-bg) 变量，根据主题切换背景色
   2. 深色模式 = 深黑背景 (#050505)
   3. 浅色模式 = 高级灰背景 (#eef2f5) - 看起来更柔和
*/
.cert-img-wrapper {
    position: relative;
    width: 100%;
    height: 220px;
    background: var(--cert-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px;
    overflow: hidden;
    transition: background 0.3s;
}

.cert-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.5s;
    /* 增加一个淡淡的边框，防止白色证书在浅色背景下看不清边界 */
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    /* 阴影 */
}

/* 鼠标悬停时，图片放大一点，不透明度拉满 */
.cert-card:hover .cert-img-wrapper img {
    transform: scale(1.05);
    opacity: 1;
}

/* 放大镜图标：根据背景色调整颜色 */
.zoom-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-bright);
    /* 跟随主题文字颜色 */
    font-size: 2rem;
    opacity: 0;
    transition: 0.3s;
    z-index: 2;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    pointer-events: none;
}

.cert-card:hover .zoom-icon {
    opacity: 1;
}

.cert-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.cert-content h3 {
    color: var(--text-bright);
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.cert-content p {
    color: var(--text-main);
    font-size: 0.9rem;
    margin-bottom: 10px;
    flex-grow: 1;
}

.cert-tag {
    align-self: flex-start;
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--bg-body);
    border: 1px solid var(--accent-hover);
    color: var(--accent-hover);
    font-weight: bold;
}

/* ================= PROJECTS ================= */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.project-card {
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 10px 30px var(--shadow-color);
}

.project-card:hover {
    transform: translateY(-8px);
}

.card-img-holder {
    position: relative;
    height: 180px;
    overflow: hidden;
}

.card-img-holder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: 0.5s;
}

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

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: 0.3s;
}

.overlay i {
    font-size: 3rem;
    color: var(--accent-color);
}

.project-card:hover .overlay {
    opacity: 1;
}

.card-content {
    padding: 20px;
}

.card-content h3 {
    color: var(--text-bright);
    margin-bottom: 10px;
}

.tags span {
    display: inline-block;
    background: var(--bg-body);
    color: var(--accent-hover);
    padding: 3px 10px;
    font-size: 0.8rem;
    border-radius: 15px;
    margin-right: 5px;
    margin-top: 10px;
    border: 1px solid var(--border-color);
}

/* ================= CONTACT ================= */
.contact-box {
    text-align: center;
    background: var(--bg-card);
    padding: 50px;
    border-radius: 12px;
    box-shadow: 0 5px 20px var(--shadow-color);
}

.email-link {
    display: block;
    font-size: 2rem;
    color: var(--accent-color);
    font-weight: bold;
    margin: 20px 0;
    word-break: break-all;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.social-icon {
    font-size: 1.5rem;
    color: var(--text-main);
    width: 50px;
    height: 50px;
    border: 1px solid var(--text-main);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.social-icon:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
    box-shadow: 0 0 15px var(--border-color);
}

/* ================= FOOTER ================= */
footer {
    text-align: center;
    padding: 30px;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: #888;
}

/* ================= IMAGE PROTECTION & MODAL (FIXED SIZE) ================= */
.protected-img {
    -webkit-user-drag: none;
    user-select: none;
    pointer-events: none;
}

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    padding-top: 0;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    align-items: center;
    justify-content: center;
}

.modal-content-wrapper {
    position: relative;
    margin: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    width: auto;
    max-width: 100%;
}

.modal-content {
    max-height: 85vh;
    max-width: 90vw;
    width: auto;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
    display: block;
    object-fit: contain;
    background: white;
    /* 确保透明小程序码能显示 */
}

.protection-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2001;
    cursor: zoom-out;
}

.close-modal {
    position: absolute;
    top: 30px;
    right: 40px;
    color: #f1f1f1;
    font-size: 50px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
    z-index: 2002;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.close-modal:hover {
    color: var(--accent-color);
    transform: scale(1.1);
}

.modal-content-wrapper {
    animation-name: zoom;
    animation-duration: 0.3s;
}

@keyframes zoom {
    from {
        transform: scale(0.8);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* ================= RESPONSIVE ================= */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero-text h1 {
        font-size: 2.2rem;
    }

    .resume-container {
        grid-template-columns: 1fr;
    }

    .email-link {
        font-size: 1.5rem;
    }

    .skills-grid,
    .cert-grid,
    .project-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        max-width: 95vw;
    }

    .close-modal {
        top: 20px;
        right: 20px;
        font-size: 40px;
    }
}