/* =========================================================
   星露游戏研习社 · 共享设计系统（亮色 / 暖橙）
   页面专属样式仍写在各页面的 <style> 中
   ========================================================= */

@font-face{
  font-family: "YouSheTitleRounded";
  src: url("fonts/youshe-title-rounded-xinglu-lab.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}
@font-face{
  font-family: "Manrope";
  src: url("fonts/manrope-latin-var.woff2") format("woff2");
  font-style: normal;
  font-weight: 200 800;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* 标题字体：思源黑体 Bold 子集，只含页面标题与页脚品牌所需字形（OFL 授权） */
@font-face{
  font-family: "XingluTitle";
  src: url("fonts/xinglu-title-sc.woff2") format("woff2");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

:root{
  color-scheme: light;

  /* 中性色：通透的暖白。原先的米色明度低、彩度也低，大面积铺开会显得发灰发旧（"脏"），
     现在提高明度、只留一点暖意；白色玻璃层靠阴影和描边浮起来 */
  --bg: #fbf6f1;
  --bg-soft: #f5ece2;
  --surface: #ffffff;
  --surface-2: #fffaf5;
  --line: rgba(84,52,28,.09);
  --line-strong: rgba(84,52,28,.16);
  --text: #221b16;
  --text-2: #574d45;
  --text-3: #74685f;

  /* 主色：暖橙 */
  --accent: #f0782a;
  --accent-hover: #f58a3f;
  --accent-strong: #c9560f;     /* 浅底上的橙色文字，满足 AA 对比度 */
  --accent-edge: #b9490a;       /* 立体按钮的"厚度"边 */
  --accent-soft: rgba(240,120,42,.11);
  --accent-tint: #fff0e3;
  --accent-grad: linear-gradient(180deg, #f78c3d 0%, #e4631b 100%);
  --on-accent: #ffffff;

  /* 辅色：取自头像围巾的墨蓝，与橙色互补，用于少量点缀 */
  --ink: #26344d;
  --ink-soft: rgba(38,52,77,.08);

  --danger: #c43d2b;
  --danger-soft: rgba(196,61,43,.08);

  /* 液态玻璃 */
  --glass-bg: linear-gradient(180deg, rgba(255,255,255,.78), rgba(255,255,255,.52));
  --glass-border: rgba(255,255,255,.82);
  --glass-shadow:
    inset 0 1px 0 rgba(255,255,255,.98),
    inset 0 -1px 0 rgba(255,255,255,.4),
    0 1px 1px rgba(84,52,28,.04),
    0 4px 10px -4px rgba(84,52,28,.08),
    0 22px 48px -22px rgba(120,62,20,.30);
  --glass-blur: blur(22px) saturate(180%);

  /* 三层阴影：贴地的接触阴影 + 中距离 + 远距离暖色投影，用来拉开层次 */
  --shadow-sm: 0 1px 2px rgba(84,52,28,.07), 0 4px 12px -6px rgba(84,52,28,.14);
  --shadow-md: 0 1px 2px rgba(84,52,28,.05), 0 8px 18px -10px rgba(84,52,28,.16), 0 26px 50px -24px rgba(140,66,16,.32);
  --shadow-lg: 0 2px 4px rgba(84,52,28,.05), 0 16px 32px -16px rgba(84,52,28,.18), 0 50px 100px -40px rgba(140,66,16,.42);

  --radius: 22px;
  --font-cjk: "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", "Hiragino Sans GB", "Source Han Sans SC", system-ui, sans-serif;
  --font: "Manrope", var(--font-cjk);
  --font-title: "XingluTitle", var(--font-cjk);
  --font-brand: "YouSheTitleRounded", var(--font-cjk);
  --font-mono: "Manrope", ui-monospace, SFMono-Regular, Consolas, monospace;

  --ease-out: cubic-bezier(.16,1,.3,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
  --ease-fluid: cubic-bezier(.65,0,.35,1);
}

*{ margin: 0; padding: 0; box-sizing: border-box; }
html{ scroll-behavior: smooth; scrollbar-gutter: stable; background: var(--bg); }
body{
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background: transparent;
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
::selection{ background: rgba(240,120,42,.24); color: var(--text); }
a{ color: inherit; text-decoration: none; }
button{ font-family: inherit; cursor: pointer; color: inherit; }
img{ max-width: 100%; }
a:focus-visible, button:focus-visible{
  outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 10px;
}
.sr-only{
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* =========================================================
   动态背景
   1. 四团暖色光斑缓慢漂移、呼吸
   2. 透视网格地面（游戏引擎视口的意象），极慢地向前推进
   3. 两道细线光环与漂浮的星芒（呼应"星露"）
   4. 跟随鼠标的轻微视差
   背景动效属于低幅度、低频率的氛围运动，因此在"减少动态效果"下仍以更慢的速度保留
   ========================================================= */
.ambient{
  position: fixed; inset: 0; z-index: -2; pointer-events: none; overflow: hidden;
  background:
    radial-gradient(1100px 620px at 50% -12%, #fff 0%, transparent 62%),
    linear-gradient(180deg, #fffbf7 0%, var(--bg) 46%, #f9f0e6 100%);
}
.amb-layer{
  position: absolute; inset: -6%;
  transform: translate3d(var(--px, 0px), var(--py, 0px), 0);
  transition: transform 1.6s var(--ease-out);
}
.ambient .blob{
  position: absolute; display: block; border-radius: 50%;
  will-change: transform;
}
.ambient .b1{
  width: 58vmax; height: 58vmax; top: -20vmax; right: -14vmax;
  background: radial-gradient(circle, rgba(255,176,112,.42) 0%, rgba(255,186,128,.16) 38%, rgba(255,196,140,0) 66%);
  animation: blob-a 26s ease-in-out var(--amb-t, 0s) infinite alternate;
}
.ambient .b2{
  width: 54vmax; height: 54vmax; bottom: -24vmax; left: -16vmax;
  background: radial-gradient(circle, rgba(255,204,150,.48) 0%, rgba(255,210,160,.16) 40%, rgba(255,214,168,0) 66%);
  animation: blob-b 31s ease-in-out var(--amb-t, 0s) infinite alternate;
}
.ambient .b3{
  width: 38vmax; height: 38vmax; top: 30%; left: 36%;
  background: radial-gradient(circle, rgba(255,226,190,.5) 0%, rgba(255,226,190,0) 64%);
  animation: blob-c 35s ease-in-out var(--amb-t, 0s) infinite alternate;
}
.ambient .b4{
  width: 36vmax; height: 36vmax; top: 4%; left: -6vmax;
  /* 冷蓝会与橙色混出灰黑，珊瑚粉铺在米色上又显得发浑，改为明亮的淡金色 */
  background: radial-gradient(circle, rgba(255,214,150,.34) 0%, rgba(255,214,150,0) 64%);
  animation: blob-d 29s ease-in-out var(--amb-t, 0s) infinite alternate;
}
@keyframes blob-a{
  0%{ transform: translate3d(0,0,0) scale(1); }
  50%{ transform: translate3d(-16vw, 12vh, 0) scale(1.14); }
  100%{ transform: translate3d(-6vw, 26vh, 0) scale(.9); }
}
@keyframes blob-b{
  0%{ transform: translate3d(0,0,0) scale(1); }
  50%{ transform: translate3d(18vw, -14vh, 0) scale(1.16); }
  100%{ transform: translate3d(30vw, -4vh, 0) scale(.94); }
}
@keyframes blob-c{
  0%{ transform: translate3d(0,0,0) scale(.85); }
  50%{ transform: translate3d(-24vw, -16vh, 0) scale(1.18); }
  100%{ transform: translate3d(14vw, 10vh, 0) scale(1); }
}
@keyframes blob-d{
  0%{ transform: translate3d(0,0,0) scale(1); }
  100%{ transform: translate3d(22vw, 44vh, 0) scale(1.2); }
}

/* 透视网格地面 */
.amb-floor{
  position: absolute; left: -40%; right: -40%; bottom: -8%; height: 58vh;
  background-image:
    linear-gradient(rgba(240,120,42,.11) 1px, transparent 1px),
    linear-gradient(90deg, rgba(240,120,42,.11) 1px, transparent 1px);
  background-size: 72px 72px;
  transform: perspective(520px) rotateX(64deg);
  transform-origin: 50% 100%;
  -webkit-mask-image: linear-gradient(to top, rgba(0,0,0,.95) 0%, rgba(0,0,0,.4) 40%, transparent 78%);
  mask-image: linear-gradient(to top, rgba(0,0,0,.95) 0%, rgba(0,0,0,.4) 40%, transparent 78%);
  animation: floor-flow 14s linear var(--amb-t, 0s) infinite;
}
@keyframes floor-flow{ to{ background-position: 0 72px, 0 0; } }

/* 细线光环 */
.amb-ring{
  position: absolute; border-radius: 50%;
  border: 1.5px solid rgba(245,140,70,.26);
  animation: ring-spin 90s linear var(--amb-t, 0s) infinite;
}
.amb-ring::after{
  content: ""; position: absolute; top: -5px; left: 50%; width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 5px rgba(240,120,42,.18), 0 0 18px rgba(240,120,42,.75);
}
.amb-ring.r1{ width: 70vmin; height: 70vmin; top: -18vmin; right: -14vmin; }
.amb-ring.r2{ width: 46vmin; height: 46vmin; bottom: 4vh; left: -12vmin; border-style: dashed; border-color: rgba(245,140,70,.3); animation-duration: 120s; animation-direction: reverse; }
.amb-ring.r3{ width: 30vmin; height: 30vmin; top: 46%; right: 8vw; border-color: rgba(255,150,80,.3); border-width: 1px; animation-duration: 70s; }
.amb-ring.r3::after{ width: 6px; height: 6px; top: auto; bottom: -3px; }
@keyframes ring-spin{ to{ transform: rotate(360deg); } }

/* 漂浮星芒 */
.amb-star{
  position: absolute; width: var(--s, 12px); height: var(--s, 12px);
  left: var(--x); top: var(--y);
  background: var(--c, rgba(240,120,42,.75));
  filter: drop-shadow(0 0 4px rgba(255,140,60,.55));
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 0c.7 6.6 4.7 10.9 12 12-7.3 1.1-11.3 5.4-12 12-.7-6.6-4.7-10.9-12-12C7.3 10.9 11.3 6.6 12 0z'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 0c.7 6.6 4.7 10.9 12 12-7.3 1.1-11.3 5.4-12 12-.7-6.6-4.7-10.9-12-12C7.3 10.9 11.3 6.6 12 0z'/%3E%3C/svg%3E") center / contain no-repeat;
  animation: star-float var(--d, 18s) ease-in-out infinite, star-twinkle calc(var(--d, 18s) / 4) ease-in-out infinite;
  animation-delay: calc(var(--delay, 0s) + var(--amb-t, 0s));
}
.amb-dot{
  position: absolute; left: var(--x); top: var(--y);
  width: var(--s, 5px); height: var(--s, 5px); border-radius: 50%;
  background: var(--c, rgba(255,160,90,.5));
  box-shadow: 0 0 8px rgba(255,170,100,.45);
  animation: star-float var(--d, 22s) ease-in-out infinite;
  animation-delay: calc(var(--delay, 0s) + var(--amb-t, 0s));
}
@keyframes star-float{
  0%, 100%{ transform: translate3d(0, 0, 0) rotate(0deg); }
  50%{ transform: translate3d(var(--dx, 18px), -46px, 0) rotate(40deg); }
}
@keyframes star-twinkle{
  0%, 100%{ opacity: .5; transform-origin: center; }
  50%{ opacity: 1; }
}

.grain{
  /* soft-light 让颗粒只调节明暗层次，不会像 multiply 那样把暖色压脏 */
  position: fixed; inset: 0; z-index: 200; pointer-events: none; opacity: .025;
  mix-blend-mode: soft-light;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* =========================================================
   液态玻璃基础类
   ========================================================= */
.glass{
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
}
/* 镜面高光：顶部一道柔和的弧形反光 */
.glass::before{
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background:
    linear-gradient(180deg, rgba(255,255,255,.7) 0%, rgba(255,255,255,0) 40%),
    radial-gradient(120% 60% at 18% 0%, rgba(255,255,255,.6), transparent 60%);
  mix-blend-mode: soft-light;
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))){
  .glass{ background: rgba(255,255,255,.95); }
}

/* =========================================================
   页眉：悬浮的液态玻璃胶囊
   ========================================================= */
.site-header{
  position: sticky; top: 0; z-index: 40;
  display: flex; justify-content: center; gap: 12px;
  padding: 14px 20px 0;
  view-transition-name: site-header;
}
.header-inner{
  flex: 1 1 auto; min-width: 0;
  max-width: 1118px; margin: 0;
  height: 70px; padding: 0 12px 0 14px;
  display: flex; align-items: center; gap: 24px;
  border-radius: 24px;
  transition: box-shadow .5s var(--ease-out);
}
.site-header.is-scrolled .header-inner,
.site-header.is-scrolled .theme-toggle{
  --glass-bg: linear-gradient(180deg, rgba(255,255,255,.86), rgba(255,255,255,.68));
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.98),
    0 1px 2px rgba(84,52,28,.06),
    0 10px 20px -12px rgba(84,52,28,.18),
    0 28px 56px -26px rgba(140,66,16,.36);
}

.brand{ display: flex; align-items: center; gap: 8px; flex-shrink: 0; border-radius: 999px; }
.brand-logo{
  width: 50px; height: 50px; border-radius: 50%; display: block; object-fit: cover;
  box-shadow: 0 2px 6px rgba(84,52,28,.16), 0 8px 18px -8px rgba(200,90,20,.45);
  transition: transform .6s var(--ease-spring), box-shadow .4s var(--ease-out);
}
.brand:hover .brand-logo{
  transform: rotate(-8deg) scale(1.06);
  box-shadow: 0 2px 6px rgba(84,52,28,.14), 0 12px 26px -8px rgba(220,100,20,.6);
}
.brand-wordmark{
  width: 165px; display: flex; flex-direction: column; gap: 3px;
  transform: translateY(1px);
}
.brand-name{
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  color: var(--text);
  font-family: var(--font-brand);
  font-size: 26.25px; font-weight: 400; line-height: 1; letter-spacing: -.04em;
  white-space: nowrap;
}
.brand-tagline{
  width: 100%; display: flex; justify-content: space-between; overflow: hidden;
  color: var(--text-3);
  font-size: 10.5px; font-weight: 700; line-height: 1; letter-spacing: .08em;
  white-space: nowrap;
}

/* 导航 + 液态滑块 */
.main-nav{
  position: relative; margin-left: auto;
  display: flex; align-items: center; gap: 2px;
  padding: 5px; border-radius: 999px;
  background: rgba(84,52,28,.05);
  box-shadow: inset 0 1px 2px rgba(84,52,28,.08), inset 0 0 0 1px rgba(84,52,28,.04);
}
.nav-indicator{
  position: absolute; top: 5px; bottom: 5px;
  left: var(--ind-l, 5px); right: var(--ind-r, 100%);
  border-radius: 999px; pointer-events: none; z-index: 0;
  background: linear-gradient(180deg, #fff, rgba(255,255,255,.86));
  border: 1px solid #fff;
  box-shadow:
    inset 0 1px 0 #fff,
    inset 0 -2px 6px rgba(240,120,42,.12),
    0 1px 2px rgba(84,52,28,.12),
    0 6px 16px -6px rgba(200,90,20,.4);
  opacity: 0;
  transition:
    left .34s var(--ease-fluid),
    right .34s var(--ease-fluid),
    opacity .25s var(--ease-out),
    transform .34s var(--ease-spring);
}
.nav-indicator::after{
  content: ""; position: absolute; left: 50%; bottom: 3px; width: 16px; height: 3px;
  border-radius: 3px; transform: translateX(-50%);
  background: var(--accent-grad);
  box-shadow: 0 0 8px rgba(240,120,42,.55);
}
.main-nav.has-indicator .nav-indicator{ opacity: 1; }
/* 左右边缘错时移动，形成"液滴拉伸"的观感 */
.main-nav.move-right .nav-indicator{ transition-delay: .055s, 0s, 0s, 0s; }
.main-nav.move-left .nav-indicator{ transition-delay: 0s, .055s, 0s, 0s; }
.main-nav.is-moving .nav-indicator{ transform: scaleY(.88); }

.nav-link{
  position: relative; z-index: 1;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 18px; border: 0; border-radius: 999px; background: none;
  color: var(--text-2);
  font-size: 15.5px; font-weight: 600; letter-spacing: .04em; line-height: 1.2;
  white-space: nowrap;
  transition: color .25s var(--ease-out), background-color .25s var(--ease-out), transform .2s var(--ease-out);
}
.nav-link svg{
  width: 17px; height: 17px; flex-shrink: 0; opacity: .7;
  transition: opacity .25s, transform .4s var(--ease-spring), color .25s;
}
.nav-link:hover{ color: var(--text); }
.nav-link:not(.active):hover{ background: rgba(255,255,255,.6); }
.nav-link:hover svg{ opacity: 1; transform: translateY(-1px) scale(1.06); }
.nav-link.active{ color: var(--text); }
.nav-link.active svg{ opacity: 1; color: var(--accent-strong); }
.nav-link:active{ transform: scale(.96); }
.main-nav:not(.has-indicator) .nav-link.active{ background: #fff; box-shadow: var(--shadow-sm); }

/* 汉堡按钮 → X 的形变 */
.menu-toggle{
  display: none; margin-left: auto;
  width: 46px; height: 46px; border-radius: 15px;
  border: 1px solid rgba(255,255,255,.9);
  background: rgba(255,255,255,.75);
  box-shadow: inset 0 1px 0 #fff, var(--shadow-sm);
  align-items: center; justify-content: center;
  transition: transform .2s var(--ease-out), background .3s;
}
.menu-toggle:active{ transform: scale(.94); }
.menu-icon{ position: relative; width: 18px; height: 14px; display: block; }
.menu-icon i{
  position: absolute; left: 0; width: 100%; height: 2px; border-radius: 2px;
  background: var(--text);
  transition: transform .45s var(--ease-spring), opacity .25s var(--ease-out), top .45s var(--ease-spring);
}
.menu-icon i:nth-child(1){ top: 0; }
.menu-icon i:nth-child(2){ top: 6px; }
.menu-icon i:nth-child(3){ top: 12px; }
.menu-toggle[aria-expanded="true"] .menu-icon i:nth-child(1){ top: 6px; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-icon i:nth-child(2){ opacity: 0; transform: scaleX(.2); }
.menu-toggle[aria-expanded="true"] .menu-icon i:nth-child(3){ top: 6px; transform: rotate(-45deg); }

/* =========================================================
   通用组件
   ========================================================= */
.container{ max-width: 1200px; margin: 0 auto; padding: 0 28px; }

.eyebrow{
  display: inline-flex; align-items: center; gap: 10px;
  margin-bottom: 16px;
  color: var(--accent-strong);
  font-size: 12.5px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase;
}
.eyebrow::before{
  content: ""; width: 22px; height: 2px; border-radius: 2px; background: var(--accent-grad);
}

.btn{
  position: relative;
  flex: 1; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 12px 18px; border-radius: 14px;
  border: 1px solid transparent;
  font-size: 15px; font-weight: 650; letter-spacing: .02em; line-height: 1.2;
  transition: transform .2s var(--ease-out), background .3s, border-color .3s, color .3s, box-shadow .35s var(--ease-out);
}
.btn:active{ transform: translateY(1px) scale(.98); }
.btn svg{ flex-shrink: 0; }
.btn-ghost{
  background: rgba(255,255,255,.75); color: var(--text);
  border-color: var(--line-strong);
  box-shadow: inset 0 1px 0 #fff, 0 1px 2px rgba(84,52,28,.05);
}
.btn-ghost:hover{ background: #fff; border-color: rgba(240,120,42,.38); color: var(--accent-strong); box-shadow: inset 0 1px 0 #fff, var(--shadow-sm); }

/* ---------- 立体主按钮（.btn-3d）----------
   常态：带"厚度"的橙色键帽；悬停：抬起、跟随指针的 3D 倾斜与高光、厚度加深，
   并有一道光泽划过；按下：下沉。光泽用背景层实现，伪元素 ::after 留给加载转圈。 */
.btn-3d{
  --rx: 0deg; --ry: 0deg; --lift: 0px; --edge: 3px; --mx: 50%; --my: 0%;
  position: relative; isolation: isolate;
  color: var(--on-accent);
  background-color: #e86c22;
  background-image:
    linear-gradient(105deg, transparent 38%, rgba(255,255,255,.42) 50%, transparent 62%),
    var(--accent-grad);
  background-size: 260% 100%, 100% 100%;
  background-position: 130% 0, 0 0;
  background-repeat: no-repeat;
  border: 0;
  text-shadow: 0 1px 1px rgba(150,60,0,.3);
  transform: perspective(600px) translateY(calc(var(--lift) * -1)) rotateX(var(--rx)) rotateY(var(--ry));
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.42),
    inset 0 -1px 0 rgba(150,60,0,.18),
    0 var(--edge) 0 var(--accent-edge),
    0 calc(var(--edge) + 2px) 4px rgba(150,60,0,.25),
    0 calc(var(--edge) + 12px) 26px -10px rgba(228,99,27,.7);
  transition:
    transform .28s var(--ease-out),
    box-shadow .28s var(--ease-out),
    background-position .9s var(--ease-out),
    filter .3s;
  will-change: transform;
}
.btn-3d::before{
  content: ""; position: absolute; inset: 0; border-radius: inherit; z-index: -1; pointer-events: none;
  background: radial-gradient(160px circle at var(--mx) var(--my), rgba(255,255,255,.38), transparent 60%);
  opacity: 0; transition: opacity .3s var(--ease-out);
}
@media (hover: hover){
  .btn-3d:hover{ --lift: 3px; --edge: 5px; background-position: -30% 0, 0 0; }
  .btn-3d:hover::before{ opacity: 1; }
}
.btn-3d:active{
  --lift: -2px; --edge: 1px;
  transform: perspective(600px) translateY(calc(var(--lift) * -1)) rotateX(var(--rx)) rotateY(var(--ry));
  transition-duration: .1s;
}
.btn-3d[aria-disabled="true"], .btn-3d:disabled, .btn-3d.is-disabled{
  --lift: 0px; --edge: 2px; --rx: 0deg; --ry: 0deg;
}
.btn-3d:focus-visible{ outline-offset: 5px; }

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position: relative;
  margin-top: auto;
  border-top: 1px solid rgba(255,255,255,.8);
  background: linear-gradient(180deg, rgba(255,255,255,.5), rgba(241,230,217,.88));
  box-shadow: 0 -1px 0 var(--line), 0 -30px 60px -40px rgba(140,66,16,.25);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
}
.footer-grid{
  max-width: 1200px; margin: 0 auto; padding: 60px 28px 46px;
  display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 48px;
}
.footer-brand{ display: flex; align-items: center; gap: 7.8px; margin-bottom: 16px; }
.footer-brand img{ width: 38px; height: 38px; border-radius: 50%; box-shadow: var(--shadow-sm); }
.footer-brand span{ font-family: var(--font-title); font-size: 19px; font-weight: 700; letter-spacing: .02em; }
.footer-about{ color: var(--text-2); font-size: 14px; line-height: 1.85; max-width: 42ch; }
.footer-col h4{
  margin-bottom: 18px;
  color: var(--text-3);
  font-size: 12.5px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
}
.footer-nav{ display: flex; flex-direction: column; gap: 12px; align-items: flex-start; }
.footer-nav button, .footer-nav a{
  border: 0; padding: 0; background: none;
  color: var(--text-2); font-size: 14.5px;
  transition: color .25s, transform .3s var(--ease-out);
}
.footer-nav button:hover, .footer-nav a:hover{ color: var(--accent-strong); transform: translateX(3px); }

.footer-bottom{ border-top: 1px solid var(--line); padding: 20px 28px; }
.footer-bottom-inner{
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap;
  color: var(--text-3); font-size: 12.5px; line-height: 1.7;
}
.footer-legal{ display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.icp-link{ color: var(--text-3); transition: color .2s; }
.icp-link:hover{ color: var(--text); }
.gongan-link{ display: inline-flex; align-items: center; gap: 5px; }
.gongan-link img{ width: 14px; height: 16px; object-fit: contain; flex: 0 0 auto; }

/* =========================================================
   页面过渡（View Transitions）
   参与过渡的只有"页面内容层"（.page-shell / 各页 main，命名为 page）：
   - 背景（光斑、光环、星芒）属于 root 层，root 层不做动画，且新状态是实时画面，
     因此背景在切换期间连续运动，不会闪回纯色底
   - 页眉单独命名，保持静止，导航滑块照常滑动
   - 站内视图切换：新内容从被点击的导航位置以圆形"液面"扩散揭开，
     旧内容同时后退（缩小 + 景深模糊），且圆内的旧内容被遮罩掉，避免新旧重影
   - 跨页面跳转：旧页后退淡出，新页从景深中浮起
   - 主题切换：整页从切换按钮处以圆弧扩散为新主题
   ========================================================= */
@property --vt-r{
  syntax: "<length>";
  inherits: false;
  initial-value: 0px;
}
@view-transition{ navigation: auto; }

.page-shell{ flex: 1; display: flex; flex-direction: column; min-width: 0; }
.page-shell, body > main{ view-transition-name: page; }

::view-transition-old(root){ display: none; }
::view-transition-new(root){ animation: none; }
::view-transition-old(site-header){ display: none; }
::view-transition-new(site-header){ animation: none; }
::view-transition-group(page){ animation: none; }

/* 跨页面 */
::view-transition-old(page){ animation: vt-page-out .42s var(--ease-out) both; }
::view-transition-new(page){ animation: vt-page-in .62s var(--ease-out) .06s both; }
@keyframes vt-page-out{ to{ opacity: 0; transform: scale(.975); filter: blur(6px); } }
@keyframes vt-page-in{ from{ opacity: 0; transform: translateY(16px) scale(1.012); filter: blur(8px); } }

/* 站内视图切换 */
html[data-vt="view"]::view-transition-old(page){
  transform-origin: var(--vt-ox, 50%) var(--vt-oy, 0);
  -webkit-mask-image: radial-gradient(circle at var(--vt-ox, 50%) var(--vt-oy, 0), transparent calc(var(--vt-r) * 1.1), #000 calc(var(--vt-r) * 1.1 + 2px));
  mask-image: radial-gradient(circle at var(--vt-ox, 50%) var(--vt-oy, 0), transparent calc(var(--vt-r) * 1.1), #000 calc(var(--vt-r) * 1.1 + 2px));
  animation: vt-view-out .8s cubic-bezier(.7,0,.15,1) both;
}
html[data-vt="view"]::view-transition-new(page){
  clip-path: circle(var(--vt-r) at var(--vt-x, 50%) var(--vt-y, 0));
  animation: vt-view-in .8s cubic-bezier(.7,0,.15,1) both;
}
@keyframes vt-view-out{
  from{ --vt-r: 0px; }
  to{ --vt-r: 160vmax; opacity: .2; transform: scale(.92); filter: blur(10px) saturate(.8); }
}
@keyframes vt-view-in{
  from{ --vt-r: 0px; filter: brightness(1.08); }
  to{ --vt-r: 160vmax; filter: none; }
}

/* 主题切换：所有内容并入 root，整体以圆弧扩散 */
html[data-vt="theme"] .site-header,
html[data-vt="theme"] .page-shell,
html[data-vt="theme"] body > main{ view-transition-name: none; }
html[data-vt="theme"]::view-transition-old(root){ display: block; animation: none; }
/* 过渡期间浏览器把点击都交给 <html>，此时连点会被当成双击/三击去选中页面文字（选中色为正文色，亮色下呈黑字），因此过渡期间禁止选中 */
html[data-vt], html[data-vt] *{ -webkit-user-select: none; user-select: none; }
html[data-vt="theme"]::view-transition-new(root){
  clip-path: circle(var(--vt-r) at var(--vt-x, 100%) var(--vt-y, 0));
  animation: vt-theme .9s cubic-bezier(.65,0,.25,1) both;
}
@keyframes vt-theme{
  from{ --vt-r: 0px; }
  to{ --vt-r: 170vmax; }
}

/* =========================================================
   响应式：窄屏导航变为下拉面板
   ========================================================= */
@media (max-width: 860px){
  .site-header{ padding: 10px 12px 0; gap: 8px; }
  .theme-toggle{ width: 64px; height: 64px; }
  .header-inner{ height: 64px; border-radius: 20px; padding: 0 9px 0 10px; }
  .brand-logo{ width: 46px; height: 46px; }
  .menu-toggle{ display: inline-flex; }
  .main-nav{
    position: absolute; top: calc(100% + 10px); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 4px;
    padding: 10px; border-radius: 20px;
    /* 父级玻璃已形成 backdrop 根，嵌套模糊不生效，因此用不透明底色保证可读 */
    background: linear-gradient(180deg, #ffffff, #fffaf5);
    border: 1px solid #fff;
    box-shadow: inset 0 1px 0 #fff, var(--shadow-lg);
    opacity: 0; visibility: hidden; pointer-events: none;
    transform: translateY(-10px) scale(.96);
    transform-origin: top right;
    transition: opacity .3s var(--ease-out), transform .5s var(--ease-spring), visibility 0s linear .5s;
  }
  .main-nav.open{
    opacity: 1; visibility: visible; pointer-events: auto; transform: none;
    transition: opacity .3s var(--ease-out), transform .5s var(--ease-spring), visibility 0s;
  }
  .main-nav .nav-link{
    justify-content: flex-start; padding: 13px 14px; border-radius: 13px; font-size: 16px;
    opacity: 0; transform: translateY(-6px);
    transition: opacity .3s var(--ease-out), transform .4s var(--ease-out), background-color .3s, color .3s;
  }
  .main-nav.open .nav-link{ opacity: 1; transform: none; }
  .main-nav.open .nav-link:nth-of-type(2){ transition-delay: .04s; }
  .main-nav.open .nav-link:nth-of-type(3){ transition-delay: .08s; }
  .main-nav.open .nav-link:nth-of-type(4){ transition-delay: .12s; }
  .main-nav .nav-link.active,
  .main-nav:not(.has-indicator) .nav-link.active{ background: var(--accent-tint); color: var(--accent-strong); box-shadow: inset 0 0 0 1px rgba(240,120,42,.18); }
  .nav-indicator{ display: none; }
  .amb-floor{ height: 40vh; background-size: 52px 52px; }
}
@media (max-width: 960px){
  .footer-grid{ grid-template-columns: 1fr 1fr; gap: 36px; }
  .footer-grid > div:first-child{ grid-column: 1 / -1; }
}
@media (max-width: 720px){
  .container{ padding: 0 20px; }
  .footer-grid{ grid-template-columns: 1fr; gap: 32px; padding: 44px 22px 36px; }
  .footer-bottom-inner, .footer-legal{ justify-content: center; text-align: center; }
}
@media (max-width: 380px){
  .header-inner{ gap: 12px; }
  .theme-toggle{ width: 56px; height: 64px; border-radius: 20px; }
  .brand{ gap: 9px; }
  .brand-logo{ width: 42px; height: 42px; }
  .brand-wordmark{ width: 140px; }
  .brand-name{ font-size: 20px; }
  .brand-tagline{ font-size: 8.8px; }
}

@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration: .01ms !important; animation-iteration-count: 1 !important;
    animation-delay: 0ms !important; transition-duration: .01ms !important; transition-delay: 0ms !important;
  }
  html{ scroll-behavior: auto; }
  /* 背景氛围动效保留，但放得更慢 */
  .ambient .blob{ animation-duration: 60s !important; animation-iteration-count: infinite !important; }
  .amb-floor{ animation-duration: 40s !important; animation-iteration-count: infinite !important; }
  .amb-ring{ animation-duration: 160s !important; animation-iteration-count: infinite !important; }
  .amb-star, .amb-dot{ animation-duration: 40s, 10s !important; animation-iteration-count: infinite !important; }
  .ambient .blob, .amb-floor, .amb-ring, .amb-star, .amb-dot{ animation-delay: var(--amb-t, 0s) !important; }
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*){ animation: none !important; }
}

/* =========================================================
   主题切换按钮（位于导航胶囊右侧，独立的玻璃圆钮）
   ========================================================= */
.theme-toggle{
  position: relative; flex: 0 0 auto;
  width: 70px; height: 70px; border-radius: 50%;
  display: grid; place-items: center;
  color: var(--text);
  overflow: hidden;
  transition: transform .4s var(--ease-spring), box-shadow .4s var(--ease-out);
}
.theme-toggle:hover{ transform: translateY(-2px) rotate(-8deg); }
.theme-toggle:active{ transform: scale(.92); }
.theme-toggle svg{
  position: absolute; width: 26px; height: 26px;
  transition: transform .7s var(--ease-spring), opacity .35s var(--ease-out);
}
.theme-toggle .i-sun{ color: var(--accent-strong); }
.theme-toggle .i-moon{ color: #ffd27a; opacity: 0; transform: translateY(26px) rotate(-90deg) scale(.4); }
html[data-theme="dark"] .theme-toggle .i-sun{ opacity: 0; transform: translateY(-26px) rotate(90deg) scale(.4); }
html[data-theme="dark"] .theme-toggle .i-moon{ opacity: 1; transform: none; }
.theme-toggle .i-sun .rays{ transform-origin: 12px 12px; transition: transform .8s var(--ease-spring); }
.theme-toggle:hover .i-sun .rays{ transform: rotate(45deg); }

/* =========================================================
   暗色主题
   不是简单反色：底色为带暖意的深炭色，橙色提亮一档以保证对比度，
   玻璃改为"烟熏玻璃"，阴影改为纯黑系，背景光斑像余烬一样发光
   ========================================================= */
/* 暗色底色用中性的石墨灰，而不是带棕调的近黑：
   低亮度的橙色光晕叠在棕黑底上会混成"脏"的褐色；放在中性灰上，橙光读作"光"而不是"污渍"。
   面板也用中性灰，橙色只出现在强调元素和光晕里。 */
html[data-theme="dark"]{
  color-scheme: dark;
  --bg: #19191b;
  --bg-soft: #1f1f22;
  --surface: #242427;
  --surface-2: #2b2b2f;
  --line: rgba(255,255,255,.08);
  --line-strong: rgba(255,255,255,.14);
  --text: #f3f1ee;
  --text-2: #c6c2bd;
  --text-3: #9b9691;

  --accent: #ff8a3d;
  --accent-hover: #ff9d5a;
  --accent-strong: #ffa466;
  --accent-edge: #9c3f08;
  --accent-soft: rgba(255,138,61,.14);
  --accent-tint: rgba(255,138,61,.13);
  --accent-grad: linear-gradient(180deg, #ff9246 0%, #e9631a 100%);

  --ink: #aebfe0;
  --ink-soft: rgba(174,191,224,.12);
  --danger: #ff8f7d;
  --danger-soft: rgba(255,143,125,.12);

  --glass-bg: linear-gradient(180deg, rgba(48,48,52,.72), rgba(32,32,35,.58));
  --glass-border: rgba(255,255,255,.08);
  --glass-shadow:
    inset 0 1px 0 rgba(255,255,255,.08),
    inset 0 -1px 0 rgba(0,0,0,.25),
    0 1px 1px rgba(0,0,0,.3),
    0 6px 14px -6px rgba(0,0,0,.45),
    0 26px 52px -24px rgba(0,0,0,.6);

  --shadow-sm: 0 1px 2px rgba(0,0,0,.35), 0 4px 12px -6px rgba(0,0,0,.45);
  --shadow-md: 0 1px 2px rgba(0,0,0,.3), 0 8px 18px -10px rgba(0,0,0,.5), 0 26px 50px -24px rgba(0,0,0,.6);
  --shadow-lg: 0 2px 4px rgba(0,0,0,.3), 0 16px 32px -16px rgba(0,0,0,.55), 0 50px 100px -40px rgba(0,0,0,.7);
}
html[data-theme="dark"] ::selection{ background: rgba(255,138,61,.35); color: #fff; }

/* 背景：光斑用更明亮、偏桃色的橙，以"滤色"叠加，读作发光而不是染色；
   点阵、网格、颗粒都调淡，避免在深色上形成脏点 */
html[data-theme="dark"] .ambient{
  background:
    radial-gradient(1100px 620px at 50% -12%, rgba(255,255,255,.05) 0%, transparent 62%),
    linear-gradient(180deg, #1d1d20 0%, var(--bg) 50%, #151517 100%);
}
html[data-theme="dark"] .ambient .blob{ mix-blend-mode: screen; }
html[data-theme="dark"] .ambient .b1{ background: radial-gradient(circle, rgba(255,150,80,.26) 0%, rgba(255,150,80,.08) 40%, rgba(255,150,80,0) 66%); }
html[data-theme="dark"] .ambient .b2{ background: radial-gradient(circle, rgba(255,180,120,.18) 0%, rgba(255,180,120,.05) 42%, rgba(255,180,120,0) 66%); }
html[data-theme="dark"] .ambient .b3{ background: radial-gradient(circle, rgba(255,214,170,.07) 0%, rgba(255,214,170,0) 64%); }
html[data-theme="dark"] .ambient .b4{ background: radial-gradient(circle, rgba(255,140,150,.12) 0%, rgba(255,140,150,0) 64%); }
html[data-theme="dark"] .ambient::after{ opacity: .25; background-image: radial-gradient(rgba(255,255,255,.18) 1px, transparent 1.2px); }
html[data-theme="dark"] .amb-floor{
  background-image:
    linear-gradient(rgba(255,170,110,.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,170,110,.09) 1px, transparent 1px);
}
html[data-theme="dark"] .amb-ring{ border-color: rgba(255,140,60,.3); }
html[data-theme="dark"] .amb-star{ filter: drop-shadow(0 0 6px rgba(255,150,70,.9)); }
html[data-theme="dark"] .grain{ opacity: .02; mix-blend-mode: soft-light; }

html[data-theme="dark"] .glass::before{
  background:
    linear-gradient(180deg, rgba(255,255,255,.07) 0%, rgba(255,255,255,0) 40%),
    radial-gradient(120% 60% at 18% 0%, rgba(255,200,150,.07), transparent 60%);
  mix-blend-mode: normal;
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))){
  html[data-theme="dark"] .glass{ background: rgba(34,34,37,.96); }
}
html[data-theme="dark"] .site-header.is-scrolled .header-inner,
html[data-theme="dark"] .site-header.is-scrolled .theme-toggle{
  --glass-bg: linear-gradient(180deg, rgba(48,48,52,.88), rgba(32,32,35,.78));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.1), 0 10px 20px -12px rgba(0,0,0,.6), 0 28px 56px -26px rgba(0,0,0,.8);
}

html[data-theme="dark"] .main-nav{ background: rgba(0,0,0,.22); box-shadow: inset 0 1px 2px rgba(0,0,0,.4), inset 0 0 0 1px rgba(255,255,255,.05); }
html[data-theme="dark"] .nav-indicator{
  background: linear-gradient(180deg, rgba(255,255,255,.16), rgba(255,255,255,.08));
  border-color: rgba(255,255,255,.14);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.18), 0 1px 2px rgba(0,0,0,.4), 0 6px 16px -6px rgba(255,120,40,.45);
}
html[data-theme="dark"] .nav-link:not(.active):hover{ background: rgba(255,255,255,.06); }
html[data-theme="dark"] .main-nav:not(.has-indicator) .nav-link.active{ background: rgba(255,255,255,.1); }
html[data-theme="dark"] .menu-toggle{ background: rgba(255,255,255,.07); border-color: rgba(255,255,255,.1); box-shadow: inset 0 1px 0 rgba(255,255,255,.08), var(--shadow-sm); }

html[data-theme="dark"] .btn-ghost{
  background: rgba(255,255,255,.05); border-color: var(--line-strong);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.06), 0 1px 2px rgba(0,0,0,.3);
}
html[data-theme="dark"] .btn-ghost:hover{ background: rgba(255,255,255,.1); border-color: rgba(255,138,61,.45); color: var(--accent-strong); }
html[data-theme="dark"] .btn-3d{ background-color: #e86c22; }

html[data-theme="dark"] .site-footer{
  border-top-color: rgba(255,255,255,.06);
  background: linear-gradient(180deg, rgba(30,30,33,.55), rgba(18,18,20,.92));
  box-shadow: 0 -1px 0 var(--line), 0 -30px 60px -40px rgba(0,0,0,.6);
}

/* 资源授权弹窗（resource-gate.css） */
html[data-theme="dark"] .resource-gate-overlay{ background: rgba(0,0,0,.5); }
html[data-theme="dark"] .resource-gate-panel{
  border-color: rgba(255,255,255,.09);
  background: linear-gradient(180deg, #29292c, #1f1f22);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08), var(--shadow-lg);
}
html[data-theme="dark"] .resource-gate-close{ background: rgba(255,255,255,.06); }
html[data-theme="dark"] .resource-gate-close:hover{ background: rgba(255,255,255,.12); }
html[data-theme="dark"] .resource-email-input{ background: rgba(0,0,0,.22); }
html[data-theme="dark"] .resource-email-input::placeholder{ color: #7d7067; }
html[data-theme="dark"] .resource-email-input:hover{ border-color: rgba(255,255,255,.28); }
html[data-theme="dark"] .resource-email-input:focus{ background: rgba(0,0,0,.3); box-shadow: 0 0 0 4px rgba(255,138,61,.2); }
html[data-theme="dark"] .resource-check-box{ background: rgba(0,0,0,.25); border-color: rgba(255,255,255,.3); box-shadow: none; }

/* 资源声明页（legal.css） */
html[data-theme="dark"] .legal-back{
  border-color: rgba(255,255,255,.1);
  background: linear-gradient(180deg, rgba(48,48,52,.85), rgba(32,32,35,.7));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08), var(--shadow-md);
}
html[data-theme="dark"] .legal-document{
  border-color: rgba(255,255,255,.08);
  background: linear-gradient(180deg, rgba(40,40,44,.9), rgba(28,28,31,.82));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.07), var(--shadow-lg);
}

@media (max-width: 860px){
  html[data-theme="dark"] .main-nav{
    background: linear-gradient(180deg, #29292c, #202023);
    border-color: rgba(255,255,255,.1);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.07), var(--shadow-lg);
  }
}