/* =========================================================
   古道景观 — 设计令牌 Design tokens
   一个高级建筑学杂志式的极简空间感系统
   色彩取自纸张、水墨、苔石与黄铜 —— 呼应「古道」与场地测绘的语汇
========================================================= */

:root{
    --paper:      #E8E5DD;   /* 石灰纸底 */
    --paper-soft: #F2F0EA;   /* 卡片浅纸 */
    --ink:        #17160F;   /* 水墨黑 */
    --ink-soft:   #3A392F;
    --moss:       #48583F;   /* 苔绿 — 主强调色 */
    --moss-deep:  #303B29;
    --stone:      #8B8577;   /* 石灰灰 — 次要文字 */
    --brass:      #A07C4A;   /* 黄铜 — 极少量点缀 */
    --line:       rgba(23,22,15,0.14);
    --line-on-dark: rgba(242,240,234,0.16);

    --font-display: 'Noto Serif SC', 'Songti SC', serif;
    --font-body:    'Noto Sans SC', 'PingFang SC', sans-serif;
    --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

    --rail-w: 52px;
    --edge: 8%;
}

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

html{
    scroll-behavior: smooth;
}

body{
    font-family: var(--font-body);
    background: var(--paper);
    color: var(--ink);
    line-height: 1.7;
    font-weight: 300;
}

a{ color: inherit; }

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

@media (prefers-reduced-motion: reduce){
    *{ animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
}

/* =========================================================
   测量标尺 — 全站签名元素
   以建筑图纸比例尺 / 场地测绘为灵感的固定滚动进度指示
========================================================= */

.rail{
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: var(--rail-w);
    z-index: 900;
    display: flex;
    align-items: center;
    pointer-events: none;
}

.rail__track{
    position: relative;
    height: 62vh;
    width: 1px;
    background: var(--ink);
    margin-left: 26px;
    mix-blend-mode: difference;
    opacity: .8;
}

.rail__tick{
    position: absolute;
    left: 10px;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 1px;
    color: var(--paper);
    mix-blend-mode: difference;
}

.rail__tick::before{
    content: "";
    position: absolute;
    right: 100%;
    top: 50%;
    width: 6px;
    height: 1px;
    background: var(--ink);
    margin-right: 4px;
}

.rail__marker{
    position: absolute;
    left: -3px;
    top: 0%;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--brass);
    transform: translateY(-50%);
    transition: top .08s linear;
}

.rail__vertical{
    position: absolute;
    bottom: 8vh;
    left: 22px;
    transform-origin: left bottom;
    transform: rotate(-90deg) translateX(-100%);
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 3px;
    color: var(--ink);
    opacity: .55;
    white-space: nowrap;
    mix-blend-mode: difference;
}

/* =========================================================
   导航
========================================================= */

.top-nav{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 34px var(--edge) 34px calc(var(--edge) + var(--rail-w));
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: .4s ease;
}

.logo-small img{
    width: 78px;
    filter: invert(1) brightness(2);
}

.top-nav nav{
    display: flex;
    align-items: center;
}

.top-nav nav a.nav-item{
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    text-decoration: none;
    margin-left: 48px;
    gap: 5px;
}

.nav-cn{
    font-family: var(--font-display);
    color: var(--paper);
    font-size: 15px;
    letter-spacing: 3px;
    transition: color .3s ease;
}

.nav-en{
    font-family: var(--font-mono);
    color: var(--paper);
    font-size: 9px;
    opacity: .5;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: opacity .3s ease;
}

.top-nav nav a.nav-item:hover .nav-cn{ color: var(--brass); }
.top-nav nav a.nav-item:hover .nav-en{ opacity: 1; }

.top-nav nav a.nav-item.active .nav-cn{ color: var(--brass); }
.top-nav nav a.nav-item.active .nav-en{ opacity: 1; }

.top-nav.scrolled{
    background: rgba(232,229,221,.86);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    padding-top: 18px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--line);
}

.top-nav.scrolled .logo-small img{ filter: none; }

.top-nav.scrolled .nav-cn{ color: var(--ink); }
.top-nav.scrolled .nav-en{ color: var(--stone); }
.top-nav.scrolled nav a.nav-item:hover .nav-cn,
.top-nav.scrolled nav a.nav-item.active .nav-cn{ color: var(--moss); }

/* =========================================================
   Hero
========================================================= */

.hero{
    height: 100vh;
    min-height: 640px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    background: var(--ink);
    color: var(--paper-soft);
    padding-left: var(--rail-w);
}

.hero-bg{
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(242,240,234,0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(242,240,234,0.035) 1px, transparent 1px);
    background-size: 52px 52px;
    background-position: center center;
    z-index: 1;
    overflow: hidden;
}

.hero-bg::before{
    content: "";
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: .05;
    z-index: 2;
    pointer-events: none;
}

.hero-bg::after{
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(160,124,74,0.10), transparent 55%);
    z-index: 3;
    pointer-events: none;
    animation: slowLight 18s ease-in-out infinite alternate;
}

.arch-line-x{
    position: absolute;
    width: 100%;
    height: 1px;
    top: 50%;
    left: 0;
    background: linear-gradient(90deg, transparent, rgba(242,240,234,0.14) 50%, transparent);
    z-index: 4;
    animation: lineGlow 8s ease-in-out infinite alternate;
}

.arch-line-y{
    position: absolute;
    width: 1px;
    height: 100%;
    top: 0;
    left: 50%;
    background: linear-gradient(180deg, transparent, rgba(242,240,234,0.14) 50%, transparent);
    z-index: 4;
    animation: lineGlow 8s ease-in-out infinite alternate-reverse;
}

@keyframes slowLight{
    0%{ transform: scale(1) translate(-2%,-2%); opacity: .7; }
    100%{ transform: scale(1.25) translate(2%,2%); opacity: 1; }
}

@keyframes lineGlow{
    0%{ opacity: .15; }
    100%{ opacity: .8; }
}

.hero-coords{
    position: absolute;
    inset: 0;
    z-index: 5;
    pointer-events: none;
}

.hero-coords__item{
    position: absolute;
    top: 150px;
    right: var(--edge);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--paper-soft);
    opacity: .34;
}

.hero-coords__item--b{
    top: auto;
    right: auto;
    bottom: 40px;
    left: calc(var(--edge) + var(--rail-w));
}

.hero-content{
    position: relative;
    z-index: 10;
}

.hero-logo{
    width: 64px;
    margin: 0 auto 30px;
    filter: brightness(0) invert(1);
    animation: fadeUp 1.2s ease both;
}

.hero-eyebrow{
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--brass);
    margin-bottom: 22px;
    animation: fadeUp 1.2s ease .15s both;
}

.hero h1{
    font-family: var(--font-display);
    font-weight: 200;
    font-size: 76px;
    letter-spacing: 10px;
    padding-left: 8px;
    margin: 6px 0 18px;
    animation: fadeUp 1.2s ease .3s both;
}

.english{
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 9px;
    color: var(--stone);
    animation: fadeUp 1.2s ease .45s both;
}

.hero-line{
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 16px;
    letter-spacing: 2px;
    color: var(--paper-soft);
    opacity: .8;
    margin-top: 34px;
    animation: fadeUp 1.2s ease .6s both;
}

.scroll{
    position: absolute;
    bottom: 46px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    font-family: var(--font-body);
    font-size: 13px;
    letter-spacing: 2px;
    color: var(--paper-soft);
    opacity: .55;
    animation: fadeUp 1.2s ease .8s both;
}

.scroll span{
    display: block;
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 4px;
    margin-top: 6px;
    opacity: .7;
}

@keyframes fadeUp{
    from{ opacity: 0; transform: translateY(28px); }
    to{ opacity: 1; transform: translateY(0); }
}

/* =========================================================
   通用 — 版块标题
========================================================= */

.section-head{
    padding: 130px var(--edge) 70px calc(var(--edge) + var(--rail-w));
    border-bottom: 1px solid var(--line);
    margin-bottom: 90px;
}

.section-head__eyebrow{
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--brass);
    margin-bottom: 18px;
}

.section-head h2{
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 40px;
    letter-spacing: 4px;
    margin-bottom: 14px;
}

.section-head__en{
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 4px;
    color: var(--stone);
    text-transform: uppercase;
    padding-bottom: 4px;
}

.section-head--dark{ border-bottom-color: var(--line-on-dark); }
.section-head--dark .section-head__en{ color: #8a8a80; }

/* =========================================================
   项目 — 非对称编辑式布局
========================================================= */

.projects{
    background: var(--paper);
    padding-bottom: 60px;
}

.project-list{
    display: block;
}

a.project-link{
    text-decoration: none;
    color: inherit;
    display: block;
}

.project{
    display: flex;
    align-items: flex-end;
    margin: 0 var(--edge) 180px calc(var(--edge) + var(--rail-w));
    overflow: visible;
}

.project--reverse{
    flex-direction: row-reverse;
}

.project-media{
    flex: 0 0 68%;
    height: 78vh;
    max-height: 720px;
    min-height: 340px;
    overflow: hidden;
    transform: translateY(46px);
    transition: transform 1s cubic-bezier(0.16,1,0.3,1);
}

.project-media img{
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.03);
    transition: transform .6s cubic-bezier(0.16,1,0.3,1);
}

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

.project-copy{
    flex: 0 0 38%;
    background: var(--paper-soft);
    margin-left: -12%;
    margin-bottom: 8%;
    padding: 42px 40px;
    position: relative;
    z-index: 5;
    box-shadow: 0 24px 60px rgba(23,22,15,0.10);
    opacity: 0;
    transform: translateY(24px);
    transition: all .9s cubic-bezier(0.16,1,0.3,1) .15s;
}

.project--reverse .project-copy{
    margin-left: 0;
    margin-right: -12%;
}

.project-index{
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 3px;
    color: var(--moss);
    margin-bottom: 16px;
}

.project-copy h3{
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 30px;
    letter-spacing: 2px;
    margin-bottom: 14px;
}

.project-meta{
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--stone);
}

.project-meta i{
    font-size: 10px;
    margin-left: 6px;
}

.project.show .project-media{ transform: translateY(0); }
.project.show .project-copy{ opacity: 1; transform: translateY(0); }

/* =========================================================
   AI 实验室
========================================================= */

.lab{
    background: var(--ink);
    color: var(--paper-soft);
    padding-bottom: 130px;
}

.lab .gallery{
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--line-on-dark);
    margin: 0 var(--edge) 0 calc(var(--edge) + var(--rail-w));
}

a.post{
    text-decoration: none;
    display: block;
    color: inherit;
}

.lab-post{
    background: var(--ink);
    padding: 56px 44px;
    transition: background .4s ease;
}

.lab-post span{
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 3px;
    color: var(--brass);
}

.lab-post h3{
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 24px;
    letter-spacing: 1px;
    margin-top: 22px;
    color: #ddd8ca;
    transition: color .3s ease;
}

.lab-post:hover{ background: #211f16; }
.lab-post:hover h3{ color: var(--paper-soft); }

/* =========================================================
   BLOG / NOTES
========================================================= */

.blog{
    padding-bottom: 130px;
}

.blog .post{
    padding: 38px var(--edge) 38px calc(var(--edge) + var(--rail-w));
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: baseline;
    gap: 34px;
    transition: padding-left .4s cubic-bezier(0.16,1,0.3,1), background .4s ease;
}

.blog .post:hover{
    padding-left: calc(var(--edge) + var(--rail-w) + 18px);
    background: var(--paper-soft);
}

.blog .post span{
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--stone);
    flex: 0 0 64px;
    transition: color .3s ease;
}

.blog .post h3{
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 26px;
    letter-spacing: 1px;
    transition: color .3s ease;
}

.blog .post:hover span{ color: var(--moss); }
.blog .post:hover h3{ color: var(--ink); }

/* =========================================================
   ABOUT
========================================================= */

.about{
    background: var(--paper-soft);
    padding: 130px var(--edge) 100px calc(var(--edge) + var(--rail-w));
}

.about-grid{
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 100px;
    max-width: 1200px;
}

.about-mark{
    width: 220px;
    max-width: 70%;
    height: auto;
    display: block;
    margin: -12px 0 18px -4px;
}

.about-role{
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--stone);
    text-transform: uppercase;
    margin-bottom: 40px;
}

.about-quote{
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 22px;
    letter-spacing: 1px;
    line-height: 1.9;
    color: var(--ink-soft);
    white-space: nowrap;
    border-left: 2px solid var(--moss);
    padding-left: 26px;
}

.contact-info{
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--ink-soft);
    line-height: 2.6;
    margin-bottom: 40px;
}

.contact-info i{
    width: 22px;
    color: var(--moss);
    text-align: center;
    margin-right: 10px;
}

.contact-info a{
    text-decoration: none;
    color: inherit;
    border-bottom: 1px solid var(--line);
    transition: color .3s ease, border-color .3s ease;
}

.contact-info a:hover{
    color: var(--moss);
    border-color: var(--moss);
}

.social-matrix{
    display: flex;
    gap: 26px;
    margin-bottom: 48px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--line);
}

.social-matrix a{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    text-decoration: none;
    transition: transform .3s cubic-bezier(0.175,0.885,0.32,1.275);
}

.social-matrix a:hover{
    transform: scale(1.12) translateY(-3px);
}

.brand-instagram{
    background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-youtube{ color: #FF0000; }

.brand-tiktok{
    color: #111111;
    text-shadow: 1.5px 1.5px 0 #ff0050, -1.5px -1.5px 0 #00f2fe;
}

.brand-telegram{ color: #229ED9; }

.wechat-qr{
    display: flex;
    align-items: center;
    gap: 20px;
}

.wechat-qr img{
    width: 92px;
    height: 92px;
    object-fit: cover;
    transition: transform .4s cubic-bezier(0.16,1,0.3,1), box-shadow .4s ease;
}

.wechat-qr:hover img{
    transform: scale(1.06);
    box-shadow: 0 0 0 3px rgba(72,88,63,.35), 0 16px 32px rgba(23,22,15,.16);
}

.wechat-qr p{
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 1px;
    color: var(--stone);
    max-width: 16ch;
    transition: color .3s ease;
}

.wechat-qr:hover p{ color: var(--moss); }

/* =========================================================
   FOOTER
========================================================= */

footer{
    background: var(--ink);
    color: var(--stone);
    padding: 40px var(--edge) 40px calc(var(--edge) + var(--rail-w));
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 2px;
}

.footer-en{ opacity: .5; }

/* =========================================================
   子页面：项目详情页
========================================================= */

.sub-page-body{ background: var(--paper); }

.sub-nav{
    padding: 30px var(--edge) 30px calc(var(--edge) + var(--rail-w));
    display: flex;
    background: var(--paper);
}

.back-btn{
    font-family: var(--font-mono);
    color: var(--stone);
    text-decoration: none;
    font-size: 12px;
    letter-spacing: 2px;
    transition: color .3s ease;
}

.back-btn:hover{ color: var(--moss); }

.project-header{
    padding: 40px var(--edge) 90px calc(var(--edge) + var(--rail-w));
}

.project-meta-tag{
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 4px;
    color: var(--brass);
    margin-bottom: 22px;
}

.project-title{
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 42px;
    letter-spacing: 3px;
    margin-bottom: 16px;
}

.project-subtitle{
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--stone);
    letter-spacing: 1px;
}

.project-gallery{
    padding: 0 var(--edge) 130px calc(var(--edge) + var(--rail-w));
    display: flex;
    flex-direction: column;
    gap: 44px;
}

.project-gallery img{
    width: 100%;
    box-shadow: 0 20px 50px rgba(23,22,15,0.06);
}

/* =========================================================
   子页面：文章 NOTES
========================================================= */

.article-container{
    max-width: 780px;
    margin: 0 auto;
    padding: 20px var(--edge) 130px;
}

.article-header{
    text-align: left;
    margin-bottom: 60px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 40px;
}

.article-content h2{
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 400;
    color: var(--ink);
    margin: 44px 0 20px;
    letter-spacing: 1px;
}

.article-content p{
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 2;
    color: var(--ink-soft);
    margin-bottom: 25px;
}

.article-content img{
    width: 100%;
    margin: 32px 0;
}

.article-content blockquote{
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 2;
    color: var(--ink-soft);
    background: var(--paper-soft);
    border-left: 2px solid var(--moss);
    padding: 22px 28px;
    margin: 8px 0 30px;
}

.article-content blockquote p{
    margin-bottom: 0;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 2;
}

.article-content blockquote strong{
    color: var(--moss);
    font-weight: 500;
}

.article-content .project-gallery{
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 22px;
    margin-bottom: 30px;
    padding: 0;
}

/* =========================================================
   子页面：实验 LAB
========================================================= */

.lab-container{
    max-width: 980px;
    margin: 0 auto;
    padding: 0 var(--edge) 130px;
}

.lab-intro{
    background: var(--paper-soft);
    padding: 46px;
    margin-bottom: 60px;
    border-left: 2px solid var(--moss);
}

.lab-intro h3{
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 3px;
    color: var(--ink);
    margin-bottom: 20px;
}

.lab-intro p{
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.9;
    color: var(--ink-soft);
    margin-bottom: 15px;
}

.lab-intro p strong,
.article-content p strong{
    color: var(--ink);
    font-weight: 500;
}

/* =========================================================
   响应式
========================================================= */

@media (max-width: 900px){

    :root{ --rail-w: 0px; }
    .rail{ display:none; }

    .top-nav{ padding: 24px 6%; }
    .top-nav nav a.nav-item{ margin-left: 20px; }

    .hero h1{ font-size: 42px; letter-spacing: 10px; padding-left: 10px; }
    .hero-eyebrow{ font-size: 10px; letter-spacing: 2px; }

    .section-head{ padding: 90px 6% 50px; }
    .section-head h2{ font-size: 28px; letter-spacing: 2px; }

    .project{
        flex-direction: column;
        margin: 0 6% 100px;
    }
    .project--reverse{ flex-direction: column; }

    .project-media{ flex-basis: auto; width: 100%; height: 380px; }

    .project-copy{
        flex-basis: auto;
        width: 88%;
        margin: -60px 0 0 auto;
    }
    .project--reverse .project-copy{ margin: -60px auto 0 0; }

    .lab .gallery{ grid-template-columns: 1fr; margin: 0 6%; }
    .lab-post{ padding: 40px 28px; }

    .blog .post{ padding: 30px 6%; gap: 18px; }
    .blog .post:hover{ padding-left: calc(6% + 14px); }

    .about{ padding: 90px 6% 70px; }
    .about-grid{ grid-template-columns: 1fr; gap: 60px; }
    .about-mark{ width: 180px; }
    .about-quote{ white-space: normal; max-width: none; }

    footer{ flex-direction: column; gap: 8px; padding: 34px 6%; text-align: center; }
}