/* --- 全局样式与变量 --- */
:root {
    --bg-color: #f0f4f8;
    --text-color: #1a202c;
    --primary-color: #007AFF;
    --glow-color-1: #007AFF;
    --glow-color-2: #58d6c9;
    --card-bg-color: rgba(255, 255, 255, 0.6);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --blur-intensity: 12px;
    --transition-speed: 0.4s;
    --border-color: rgba(255, 255, 255, 0.2);
    --visual-bg-color: rgba(20, 20, 40, 0.7);
}

.dark-mode {
    --bg-color: #05050A;
    --text-color: #e0e0e0;
    --card-bg-color: rgba(26, 26, 26, 0.6);
    --shadow-color: rgba(0, 0, 0, 0.4);
    --border-color: rgba(255, 255, 255, 0.1);
    --visual-bg-color: rgba(0, 0, 0, 0.5);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
    position: relative;
}

/* --- 全局美化滚动条 --- */
html {
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) transparent;
}
body::-webkit-scrollbar {
    width: 8px;
}
body::-webkit-scrollbar-track {
    background: transparent;
}
body::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--glow-color-2), var(--glow-color-1));
    border-radius: 4px;
}
body::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--glow-color-1), var(--glow-color-2));
}

/* --- 动态背景 --- */
#dynamic-bg { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -2; background: linear-gradient(45deg, #007aff, #34aadc, #58d6c9, #79f8b6); background-size: 400% 400%; animation: gradient-animation 15s ease infinite; }
@keyframes gradient-animation { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }
#particle-canvas { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: -1; }

/* --- 容器和布局 --- */
.container { max-width: 1000px; margin: 0 auto; padding: 0 2rem; }

/* --- 头部导航 --- */
header { padding: 1.5rem 0; position: fixed; top: 0; left: 0; width: 100%; z-index: 100; transition: background-color var(--transition-speed), box-shadow var(--transition-speed); }
header .container { display: flex; justify-content: space-between; align-items: center; width: 100%; }
header.scrolled { background-color: var(--card-bg-color); backdrop-filter: blur(var(--blur-intensity)); -webkit-backdrop-filter: blur(var(--blur-intensity)); box-shadow: 0 4px 30px var(--shadow-color); }
.logo { font-weight: 700; font-size: 1.5rem; cursor: pointer; }
.theme-switcher { cursor: pointer; background: none; border: none; color: var(--text-color); padding: 0.5rem; }

/* --- Hero 区域 --- */
.hero { min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center; flex-direction: column; padding: 5rem 2rem; position: relative; }
.hero-card { background: transparent; padding: 3rem 4rem; border-radius: 20px; }
.hero-card h1 { font-size: clamp(2.8rem, 5vw, 4rem); margin-bottom: 0.5rem; font-weight: 700; background: linear-gradient(90deg, var(--text-color), color-mix(in srgb, var(--text-color) 70%, var(--primary-color))); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-card p { font-size: clamp(1rem, 2vw, 1.25rem); font-weight: 400; opacity: 0.7; }
.scroll-down-indicator { position: absolute; bottom: 3rem; left: 50%; transform: translateX(-50%); color: var(--text-color); opacity: 0.7; animation: bounce 2s infinite; }
@keyframes bounce { 0%, 20%, 50%, 80%, 100% { transform: translate(-50%, 0); } 40% { transform: translate(-50%, -20px); } 60% { transform: translate(-50%, -10px); } }

/* --- 文字浮现动画 --- */
.reveal-text {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.reveal-text.is-visible {
    opacity: 1;
    transform: translateY(0);
}
.hero-card p.reveal-text {
    transition-delay: 0.2s;
}
.project-content h3.reveal-text {
    transition-delay: 0.1s;
}

/* 项目介绍逐字动画 */
.reveal-text-p {
    opacity: 0; /* 初始时整个段落透明 */
}
.reveal-text-p.is-visible {
    opacity: 1;
}
.reveal-text-p .char {
    display: inline-block;
    opacity: 0;
    transform: translateY(10px);
}

/* --- 项目区域 (科技感重构) --- */
.projects {
    padding: 8rem 0;
    position: relative;
    background-color: var(--bg-color);
    overflow: hidden; /* 隐藏溢出的辉光 */
}
/* 背景辉光 */
.projects::before, .projects::after {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    opacity: 0.15;
    z-index: -1;
    filter: blur(100px);
}
.projects::before {
    background: radial-gradient(circle, var(--glow-color-1), transparent 60%);
    top: 10%;
    left: -200px;
}
.projects::after {
    background: radial-gradient(circle, var(--glow-color-2), transparent 60%);
    bottom: 10%;
    right: -200px;
}
.section-title { text-align: center; font-size: 2.5rem; margin-bottom: 3rem; font-weight: 700; }

/* 分类切换器样式 */
.filter-controls {
    display: flex;
    justify-content: center;
    margin-bottom: 4rem;
    background: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.5rem;
    position: relative;
    backdrop-filter: blur(5px);
    width: max-content;
    margin-left: auto;
    margin-right: auto;
}
.filter-active-bg {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    height: calc(100% - 1rem);
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: left 0.4s cubic-bezier(0.22, 1, 0.36, 1), width 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    z-index: 1;
}
.dark-mode .filter-active-bg {
    background: var(--primary-color);
}
.filter-btn {
    background: none;
    border: none;
    padding: 0.75rem 1.5rem;
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.3s ease;
    position: relative;
    z-index: 2;
}
.filter-btn.active {
    color: var(--primary-color);
}
.dark-mode .filter-btn.active {
    color: white;
}


.project-list { display: flex; flex-direction: column; gap: 8rem; }
.project-item { 
    display: flex; 
    align-items: center; 
    gap: 4rem; 
    transition: opacity 0.5s ease, transform 0.5s ease, max-height 0.6s ease, margin-bottom 0.6s ease;
}
.project-item.filtered-out {
    opacity: 0;
    transform: scale(0.95);
    max-height: 0;
    margin-bottom: -8rem;
    pointer-events: none;
    overflow: hidden;
}

.project-item:nth-child(even) { flex-direction: row-reverse; }

.project-item:nth-child(even) .project-content {
    order: 2;
}

.project-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.project-content { flex: 1; }
.project-tag {
    display: inline-block;
    font-family: monospace;
    font-size: 0.8rem;
    padding: 0.3rem 0.6rem;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 5px;
    margin-bottom: 1rem;
    opacity: 0.8;
}
.project-content h3 { font-size: 2rem; font-weight: 700; margin-bottom: 1rem; }
.project-content p { line-height: 1.8; margin-bottom: 1.5rem; opacity: 0.7; max-width: 450px; }

/* 科技感图标按钮 */
.project-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--card-bg-color);
    color: var(--primary-color);
    border: 1px solid var(--border-color);
    text-decoration: none;
    transition: all var(--transition-speed) ease;
    box-shadow: 0 0 0 0 rgba(0, 122, 255, 0.7);
    backdrop-filter: blur(5px);
}
.project-link:hover {
    transform: scale(1.1);
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 0 20px 5px rgba(0, 122, 255, 0.4);
}

/* 科技感视觉面板 */
.project-visual {
    --x: 50%; --y: 50%; /* JS会更新这两个变量 */
    position: relative;
    flex: 1;
    background-color: var(--visual-bg-color);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-speed), border-color var(--transition-speed);
    min-height: 300px;
    overflow: hidden; 
    text-decoration: none;
}
.project-visual img {
    position: absolute; 
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover; 
    opacity: 0.8;
    transition: opacity var(--transition-speed), transform var(--transition-speed), filter var(--transition-speed);
}
.project-item:hover .project-visual img {
    opacity: 1;
    transform: scale(1.05);
    filter: brightness(1.1);
}

/* (新增) 留言板区域 */
.message-board {
    padding: 4rem 0 8rem 0;
    position: relative;
    background-color: var(--bg-color);
    z-index: 1;
}
.board-container {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 8px 32px 0 var(--shadow-color);
    border: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.1);
}
.board-container iframe {
    display: block;
    border: none;
    width: 100%;
    height: 600px;
}

/* (新增) 咖啡区域 */
.coffee-section {
    padding: 4rem 0 8rem 0;
    position: relative;
    background-color: var(--bg-color);
    z-index: 1;
}
.coffee-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}
.coffee-content .qrcode-wrapper {
    width: 100%;
    max-width: 280px;
    aspect-ratio: 1 / 1;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    box-shadow: 0 8px 32px 0 var(--shadow-color);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}
.coffee-content p {
    font-size: 1rem;
    opacity: 0.8;
}


/* --- 页脚 --- */
footer { 
    background-color: var(--bg-color); 
    text-align: center; 
    padding: 3rem 0; 
    position: relative; 
    z-index: 1;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}
.contact-icons { display: flex; justify-content: center; gap: 2rem; margin-bottom: 1.5rem; }
.contact-icon { position: relative; color: var(--text-color); opacity: 0.7; transition: opacity var(--transition-speed), transform var(--transition-speed); background: none; border: none; cursor: pointer; font-family: inherit;}
.contact-icon:hover { opacity: 1; transform: scale(1.1); }
.contact-icon .tooltip { visibility: hidden; width: max-content; background-color: var(--text-color); color: var(--bg-color); text-align: center; border-radius: 6px; padding: 8px 12px; position: absolute; z-index: 1; bottom: 150%; left: 50%; transform: translateX(-50%); opacity: 0; transition: opacity var(--transition-speed); font-size: 0.9rem; }
.contact-icon .tooltip::after { content: ""; position: absolute; top: 100%; left: 50%; margin-left: -5px; border-width: 5px; border-style: solid; border-color: var(--text-color) transparent transparent transparent; }
.contact-icon:hover .tooltip { visibility: visible; opacity: 1; }

/* --- 模态框样式 --- */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed) ease;
}

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

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
}

.modal-content {
    position: relative;
    background: var(--card-bg-color);
    padding: 2rem;
    border-radius: 20px;
    backdrop-filter: blur(var(--blur-intensity));
    -webkit-backdrop-filter: blur(var(--blur-intensity));
    box-shadow: 0 8px 32px 0 var(--shadow-color);
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 340px;
    transform: scale(0.95);
    transition: transform var(--transition-speed) ease;
}

.modal.active .modal-content {
    transform: translateY(0) scale(1);
    opacity: 1;
}

.modal-close {
    position: absolute;
    top: 0.75rem; /* 向上移动 */
    right: 1rem;  /* 向右移动 */
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-color);
    opacity: 0.7;
    cursor: pointer;
    transition: opacity var(--transition-speed), transform var(--transition-speed);
}
.modal-close:hover {
    opacity: 1;
    transform: rotate(90deg);
}

.modal-body {
    width: 100%;
    height: auto;
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

body.modal-open {
    overflow: hidden;
}

.loading-text {
    color: var(--text-color);
    font-size: 1rem;
    opacity: 0.7;
}

#qrcode-container, #coffee-qrcode {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}
#qrcode-container canvas, #coffee-qrcode canvas {
    border-radius: 10px;
    width: 100% !important;
    height: 100% !important;
}

/* --- 回到顶部按钮样式 --- */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 56px; 
    height: 56px;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    backdrop-filter: blur(8px); 
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease, box-shadow 0.3s ease;
}

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

.back-to-top:hover {
    box-shadow: 0 0 20px 5px rgba(0, 122, 255, 0.2);
    transform: scale(1.05);
}

.back-to-top.disabled {
    opacity: 0.5;
    pointer-events: none;
    transform: scale(1); 
    box-shadow: none;
}

.back-to-top i {
    color: var(--text-color);
    width: 28px; 
    height: 28px;
    z-index: 2;
}

.progress-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-90deg);
}

.progress-ring__circle {
    stroke: url(#progress-gradient);
    transition: stroke-dashoffset 0.2s linear;
}

.progress-ring__circle-bg {
    stroke: var(--border-color);
    opacity: 0.5;
}


/* --- 响应式设计 --- */
@media (max-width: 1024px) {
    .project-item {
        gap: 2rem;
    }
    .project-content h3 {
        font-size: 1.8rem;
    }
     .projects {
        padding: 6rem 0;
    }
}


@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-card { 
        padding: 2rem;
        width: 100%;
    }
    
    .hero-card h1 {
         font-size: clamp(2.2rem, 8vw, 2.8rem);
    }

    .project-item, 
    .project-item:nth-child(even) {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }
    
    .project-content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .project-content p {
        max-width: 100%;
    }
    
    .project-visual {
        width: 100%;
        min-height: 250px;
    }

    .back-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 50px;
        height: 50px;
    }
    
    .back-to-top i {
        width: 24px;
        height: 24px;
    }
    
}