/* ============================================================
   西域古城 · 全站样式
   深色底 + 沙金点缀，作品集 / 影像档案气质
   ============================================================ */

:root {
	--bg:#0b0c0e;
	--bg-2:#121317;
	--bg-3:#171a1f;
	--line:rgba(255,255,255,.10);
	--line-2:rgba(255,255,255,.20);
	--fg:#f2f3f5;
	--muted:#98a0aa;
	--accent:#d9a441;
	--accent-2:#e8b558;
	--font:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
	--maxw:1180px;
}

* { box-sizing:border-box; }
html { scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body {
	margin:0; background:var(--bg); color:var(--fg); font-family:var(--font);
	line-height:1.75; -webkit-font-smoothing:antialiased; overflow-x:hidden;
}
a { color:inherit; text-decoration:none; }
img { display:block; max-width:100%; }
.wrap { width:min(var(--maxw), 100% - 44px); margin-inline:auto; }
.mono { font-variant-numeric:tabular-nums; }

/* ---------------- 顶部导航 ---------------- */
.nav {
	position:fixed; inset:0 0 auto 0; z-index:50;
	display:flex; align-items:center;
	padding:16px 0; padding-top:calc(16px + env(safe-area-inset-top));
	transition:background .25s ease, border-color .25s ease;
	border-bottom:1px solid transparent;
}
.nav.solid {
	background:rgba(11,12,14,.78);
	-webkit-backdrop-filter:blur(16px); backdrop-filter:blur(16px);
	border-bottom-color:var(--line);
}
.nav .wrap { display:flex; align-items:center; justify-content:space-between; gap:20px; }
.brand { display:flex; align-items:center; gap:10px; font-size:15px; letter-spacing:.14em; white-space:nowrap; }
.brand .dot { width:9px; height:9px; border-radius:50%; background:var(--accent); box-shadow:0 0 0 4px rgba(217,164,65,.14); }
.brand small { font-size:11px; letter-spacing:.2em; color:var(--muted); margin-left:2px; }
.nav nav { display:flex; align-items:center; gap:26px; font-size:14px; color:var(--muted); }
.nav nav a:hover { color:var(--fg); }
.nav .mini {
	padding:8px 16px; border-radius:999px; font-size:13px; color:var(--fg);
	border:1px solid var(--line-2); transition:background .18s ease, border-color .18s ease;
}
.nav .mini:hover { background:rgba(255,255,255,.08); border-color:rgba(255,255,255,.36); }
@media (max-width:720px) { .nav nav .hide-sm { display:none; } .brand small { display:none; } }

/* ---------------- 首屏 ---------------- */
.hero { position:relative; min-height:100svh; display:flex; align-items:flex-end; padding-bottom:clamp(48px, 9vh, 108px); overflow:hidden; }
.hero-bg { position:absolute; inset:0; background-size:cover; background-position:center 74%; transform:scale(1.04); }
.hero:after {
	content:""; position:absolute; inset:0;
	background:
		linear-gradient(180deg, rgba(11,12,14,.88) 0%, rgba(11,12,14,.24) 26%, rgba(11,12,14,.58) 62%, rgba(11,12,14,.98) 100%),
		radial-gradient(120% 80% at 12% 88%, rgba(11,12,14,.74) 0%, rgba(11,12,14,0) 62%);
}
.hero-inner { position:relative; z-index:2; padding-top:120px; }
.eyebrow {
	display:inline-flex; align-items:center; gap:10px;
	margin:0 0 20px; font-size:12.5px; letter-spacing:.22em; text-transform:uppercase; color:var(--accent);
}
.eyebrow:before { content:""; width:34px; height:1px; background:var(--accent); opacity:.7; }
h1 { margin:0; font-weight:300; letter-spacing:.06em; font-size:clamp(2.7rem, 8.4vw, 5.4rem); line-height:1.06; }
h1 .thin { color:var(--muted); }
.lede { margin:24px 0 0; max-width:46ch; font-size:clamp(15px,1.4vw,17px); color:#cdd3db; }
.cta { display:flex; flex-wrap:wrap; gap:14px; margin-top:38px; }
.btn {
	display:inline-flex; align-items:center; gap:10px;
	padding:15px 30px; border-radius:999px; font-size:15px; letter-spacing:.03em;
	transition:transform .18s ease, background .18s ease, border-color .18s ease, opacity .18s ease;
}
.btn svg { width:15px; height:15px; }
.btn.solid { background:var(--accent); color:#16130c; font-weight:500; }
.btn.solid:hover { transform:translateY(-2px); background:var(--accent-2); }
.btn.line { border:1px solid var(--line-2); color:var(--fg); }
.btn.line:hover { transform:translateY(-2px); background:rgba(255,255,255,.08); border-color:rgba(255,255,255,.4); }
.facts { display:flex; flex-wrap:wrap; gap:14px 34px; margin:44px 0 0; padding:0; list-style:none; font-size:13.5px; color:var(--muted); }
.facts li { display:flex; align-items:center; gap:9px; }
.facts li:before { content:""; width:5px; height:5px; border-radius:50%; background:var(--accent); opacity:.75; }

/* ---------------- 区块通用 ---------------- */
section { position:relative; }
.sec { padding:clamp(72px,11vh,124px) 0; }
.sec-head { display:flex; align-items:baseline; justify-content:space-between; gap:20px; flex-wrap:wrap; margin-bottom:36px; }
h2 { margin:0; font-weight:400; font-size:clamp(1.5rem,3.2vw,2.05rem); letter-spacing:.04em; }
h2 em { font-style:normal; color:var(--muted); font-size:.6em; letter-spacing:.16em; margin-left:12px; }
.sec-head p { margin:0; font-size:14px; color:var(--muted); }

/* 页面头（内页） */
.page-head { padding:calc(120px + env(safe-area-inset-top)) 0 0; }
.page-head h1 { font-size:clamp(2rem,5vw,3.1rem); }
.page-head .lede { margin-top:16px; }

/* ---------------- 系列条 ---------------- */
.series-band { border-top:1px solid var(--line); border-bottom:1px solid var(--line); background:linear-gradient(180deg, rgba(217,164,65,.045), rgba(0,0,0,0)); }
.series-band .wrap { display:flex; flex-wrap:wrap; align-items:center; gap:18px 46px; padding:34px 0; }
.series-band .sk { font-size:12px; letter-spacing:.22em; color:var(--accent); text-transform:uppercase; }
.series-stat { display:flex; align-items:baseline; gap:9px; font-size:14px; color:var(--muted); }
.series-stat b { font-size:26px; font-weight:400; color:var(--fg); letter-spacing:.02em; }
@media (max-width:720px){ .series-band .wrap { gap:16px 30px; padding:26px 0; } }

/* ---------------- 卡片网格 ---------------- */
.grid { display:grid; grid-template-columns:repeat(auto-fill, minmax(min(100%, 340px), 1fr)); gap:26px; }
/* 照片墙改用多列瀑布流：照片本身有横有竖，定高裁切会切掉内容 */
.grid.photos { display:block; columns:240px 4; column-gap:16px; }
.grid.photos .photo { margin:0 0 16px; break-inside:avoid; }
.grid.photos > .empty { column-span:all; }
/* 首页只显示 6 张，3 栏正好铺满两行；影像页展示全部，用 4 栏 */
#photos .grid.photos { columns:280px 3; }
.card {
	position:relative; border:1px solid var(--line); border-radius:16px; overflow:hidden;
	background:var(--bg-2); transition:transform .3s ease, border-color .3s ease;
}
.card:hover { transform:translateY(-5px); border-color:var(--line-2); }
.card .shot { position:relative; aspect-ratio:16/10; overflow:hidden; background:#000; }
.card .shot img { width:100%; height:100%; object-fit:cover; transition:transform .6s cubic-bezier(.2,.7,.3,1); }
.card:hover .shot img { transform:scale(1.06); }
.card .badge {
	position:absolute; top:14px; left:14px; z-index:2;
	display:inline-flex; align-items:center; gap:7px;
	padding:6px 13px; border-radius:999px; font-size:12px;
	background:rgba(11,12,14,.62); border:1px solid rgba(255,255,255,.16);
	-webkit-backdrop-filter:blur(10px); backdrop-filter:blur(10px); color:#e7eaee;
}
.card .badge:before { content:""; width:6px; height:6px; border-radius:50%; background:var(--accent); }
.card .body { padding:20px 22px 24px; }
.card h3 { margin:0 0 8px; font-size:18px; font-weight:500; letter-spacing:.02em; }
.card .sub { margin:0; font-size:13.5px; color:var(--muted); }
.card .go { display:inline-flex; align-items:center; gap:8px; margin-top:18px; font-size:14px; color:var(--accent); transition:gap .18s ease; }
.card .go:hover { gap:13px; }
.card .go svg { width:15px; height:15px; }
.tags { display:flex; flex-wrap:wrap; gap:7px; margin:14px 0 0; padding:0; list-style:none; }
.tags li { font-size:11.5px; letter-spacing:.05em; color:var(--muted); border:1px solid var(--line); border-radius:999px; padding:3px 10px; }

/* 照片卡 */
.photo { position:relative; display:block; border:1px solid var(--line); border-radius:12px;
	overflow:hidden; background:var(--bg-2); break-inside:avoid; cursor:zoom-in; }
.photo img { width:100%; height:auto; display:block; transition:transform .6s cubic-bezier(.2,.7,.3,1); }
.photo:hover img { transform:scale(1.05); }
.photo .cap {
	position:absolute; inset:auto 0 0 0; padding:30px 14px 12px;
	background:linear-gradient(180deg, rgba(0,0,0,0), rgba(0,0,0,.8));
	font-size:13px; color:#e7eaee;
	opacity:0; transform:translateY(6px); transition:opacity .25s ease, transform .25s ease;
}
.photo:hover .cap { opacity:1; transform:none; }
.photo .cap span { display:block; font-size:11.5px; color:#a9b0ba; margin-top:2px; }
/* 触屏设备没有 hover，图注常显，否则手机上永远看不见标题 */
@media (hover:none), (max-width:640px) {
	.photo .cap { opacity:1; transform:none; }
}

/* ---------------- 空状态 ---------------- */
.grid > .empty { grid-column:1 / -1; }   /* 空状态永远横跨整行，不要被挤进单列 */
.empty {
	border:1px dashed var(--line-2); border-radius:16px; padding:clamp(34px,6vw,64px);
	text-align:center; color:var(--muted); font-size:14.5px;
	background:linear-gradient(180deg, rgba(255,255,255,.028), rgba(255,255,255,0));
}
.empty b { display:block; color:var(--fg); font-size:16px; font-weight:500; margin-bottom:10px; }
.empty code { background:rgba(255,255,255,.07); border:1px solid var(--line); border-radius:5px; padding:1px 6px; font-size:13px; color:var(--accent); }
.empty p { margin:8px 0 0; line-height:1.9; }

/* ---------------- 观看提示 ---------------- */
.tip-box {
	border:1px solid var(--line); border-radius:18px; padding:clamp(28px,4vw,46px);
	background:linear-gradient(180deg, rgba(255,255,255,.035), rgba(255,255,255,0));
}
.tip-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(min(100%,215px),1fr)); gap:26px 32px; margin-top:30px; }
.tip { display:flex; gap:14px; align-items:flex-start; }
.tip .ico {
	flex:0 0 38px; width:38px; height:38px; border-radius:11px;
	display:grid; place-items:center; background:rgba(217,164,65,.12); border:1px solid rgba(217,164,65,.22);
}
.tip .ico svg { width:17px; height:17px; stroke:var(--accent); fill:none; stroke-width:1.7; stroke-linecap:round; stroke-linejoin:round; }
.tip b { display:block; font-size:14.5px; font-weight:500; margin-bottom:3px; }
.tip span { font-size:13px; color:var(--muted); line-height:1.6; }

/* ---------------- 页脚 ---------------- */
footer { border-top:1px solid var(--line); padding:34px 0 44px; padding-bottom:calc(44px + env(safe-area-inset-bottom)); }
footer .wrap { display:flex; flex-wrap:wrap; gap:14px; align-items:center; justify-content:space-between; font-size:13px; color:var(--muted); }
footer a:hover { color:var(--fg); }

/* ---------------- 图片灯箱 ---------------- */
.lb { position:fixed; inset:0; z-index:80; display:none;
	background:rgba(8,9,11,.94); -webkit-backdrop-filter:blur(6px); backdrop-filter:blur(6px); }
.lb.on { display:block; }
.lb-stage { position:absolute; inset:0; display:grid; place-items:center;
	padding:clamp(14px,4vw,60px); cursor:zoom-out; touch-action:none; overflow:hidden; }
.lb-stage.zoomed { cursor:grab; }
.lb-stage.zoomed:active { cursor:grabbing; }
/* 必须用 flex，不能用 grid：
   grid 里单项的行轨道高度由内容撑开，img 的 max-height:100% 就没有确定的
   参照值，会被当成 none —— 竖构图照片于是按原始 2000px 渲染，超出屏幕被裁掉。
   flex 容器的内容盒高度是确定的，百分比才能正常生效。 */
.lb-canvas { position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
	transform-origin:center center; will-change:transform; }
.lb-stage img { max-width:100%; max-height:100%; -webkit-user-select:none; user-select:none; border-radius:10px; box-shadow:0 24px 70px rgba(0,0,0,.6);
	animation:lbIn .22s ease; }
@keyframes lbIn { from { opacity:0; } to { opacity:1; } }
.lb-btn {
	position:absolute; z-index:2; width:46px; height:46px; padding:0; border-radius:50%; cursor:pointer;
	display:grid; place-items:center; color:#f2f3f5; font-size:26px; line-height:1;
	background:rgba(20,21,24,.66); border:1px solid rgba(255,255,255,.16);
	-webkit-backdrop-filter:blur(10px); backdrop-filter:blur(10px);
	transition:background .18s ease, border-color .18s ease;
}
.lb-btn:hover { background:rgba(38,40,46,.92); border-color:rgba(255,255,255,.34); }
.lb-btn svg { width:20px; height:20px; display:block; }
.lb-close { top:calc(16px + env(safe-area-inset-top)); right:calc(16px + env(safe-area-inset-right)); }
.lb-prev { left:calc(14px + env(safe-area-inset-left)); top:50%; transform:translateY(-50%); }
.lb-next { right:calc(14px + env(safe-area-inset-right)); top:50%; transform:translateY(-50%); }
.lb-cap {
	position:absolute; left:0; right:0; bottom:0; z-index:2; text-align:center; pointer-events:none;
	padding:24px 20px calc(20px + env(safe-area-inset-bottom));
	background:linear-gradient(180deg, rgba(0,0,0,0), rgba(0,0,0,.74));
}
.lb-cap b { display:block; font-size:15px; font-weight:500; color:var(--fg); }
.lb-cap span { display:block; margin-top:4px; font-size:12.5px; color:var(--muted); font-variant-numeric:tabular-nums; }
@media (max-width:640px) {
	.lb-btn { width:40px; height:40px; }
	.lb-close { top:calc(10px + env(safe-area-inset-top)); right:calc(10px + env(safe-area-inset-right)); }
	.lb-prev { left:6px; } .lb-next { right:6px; }
}

/* ---------------- 进场动画 ---------------- */
.reveal { opacity:0; transform:translateY(22px); transition:opacity .7s ease, transform .7s cubic-bezier(.2,.7,.3,1); }
.reveal.in { opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce) {
	.reveal { opacity:1; transform:none; transition:none; }
	html { scroll-behavior:auto; }
}

/* ---------------- 灯箱：缩放工具条 ---------------- */
.lb-tools {
	position:absolute; z-index:3; left:50%; transform:translateX(-50%);
	top:calc(16px + env(safe-area-inset-top));
	display:flex; align-items:center; gap:8px;
	padding:6px 8px; border-radius:999px;
	background:rgba(20,21,24,.72); border:1px solid rgba(255,255,255,.16);
	-webkit-backdrop-filter:blur(12px); backdrop-filter:blur(12px);
	font-size:12.5px; color:var(--muted); font-variant-numeric:tabular-nums;
}
.lb-z { padding:0 6px 0 4px; min-width:44px; text-align:center; }
.lb-tools button {
	width:28px; height:28px; padding:0; border-radius:50%; cursor:pointer;
	background:rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.14);
	color:var(--fg); font-size:15px; line-height:1; display:grid; place-items:center;
	transition:background .18s ease;
}
.lb-tools button:hover { background:rgba(255,255,255,.18); }
.lb-tools .lb-zreset { width:auto; padding:0 12px; border-radius:999px; font-size:12.5px; }
@media (max-width:640px) { .lb-tools { top:calc(58px + env(safe-area-inset-top)); } }

/* ---------------- 照片分组 ---------------- */
.photo-group { margin-bottom:clamp(38px,5.5vw,68px); }
.photo-group:last-child { margin-bottom:0; }
.group-head { display:flex; align-items:baseline; gap:14px; margin:0 0 22px; }
.group-head h3 {
	margin:0; font-weight:400; font-size:clamp(1.15rem,2.2vw,1.45rem); letter-spacing:.05em;
}
.group-head h3:before {
	content:""; display:inline-block; width:22px; height:1px; background:var(--accent);
	opacity:.85; vertical-align:middle; margin-right:13px;
}
.group-head span { font-size:12.5px; color:var(--muted); font-variant-numeric:tabular-nums; }