/* 个人站外壳：侧栏、手机顶栏、页头、分区，以及「我的台阶」入口和第一次的提示 */

/* ---------- 外壳 ---------- */

#site {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: 264px minmax(0, 1fr);
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(80, 100, 220, .14), transparent 60%),
    radial-gradient(900px 520px at 0% 110%, rgba(150, 80, 200, .1), transparent 60%),
    #05060b;
}
.s-main { min-width: 0; padding: clamp(40px, 8vh, 96px) clamp(28px, 6vw, 120px) 90px; }
.s-page { max-width: 1120px; }
.s-page.in > * { animation: rise .9s var(--ease-out) backwards; }
.s-page.in > *:nth-child(2) { animation-delay: .08s; }
.s-page.in > *:nth-child(3) { animation-delay: .16s; }
.s-page.in > *:nth-child(n + 4) { animation-delay: .24s; }

/* ---------- 侧栏 ---------- */

.s-side {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  gap: 22px;
  height: 100vh;
  padding: 28px 18px 24px;
  border-right: 1px solid var(--line);
  background: rgba(8, 10, 18, .55);
}
.s-brand { padding: 0 10px; }
.s-me { display: flex; align-items: center; gap: 12px; padding: 16px 10px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.s-me b { display: block; font-size: 14.5px; }
.s-me small { font-size: 12px; color: var(--text-3); }
.s-avatar {
  flex: none;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: conic-gradient(from 200deg, var(--blue), var(--violet), var(--pink), var(--orange), var(--blue));
  box-shadow: 0 0 0 2px #05060b, 0 0 0 3px rgba(255, 255, 255, .18), 0 0 24px rgba(120, 140, 255, .35);
}
.s-nav { display: flex; flex-direction: column; gap: 2px; }
.s-nav a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 42px;
  padding: 0 12px;
  border-radius: 10px;
  color: var(--text-2);
  text-decoration: none;
  font-size: 14.5px;
  letter-spacing: .04em;
  transition: color .25s, background .25s;
}
.s-nav a:hover { color: var(--text); background: rgba(255, 255, 255, .04); }
.s-nav a.on { color: #fff; background: rgba(255, 255, 255, .07); }
.s-nav a.on::before { content: ''; position: absolute; left: -18px; top: 10px; bottom: 10px; width: 3px; border-radius: 0 3px 3px 0; background: linear-gradient(var(--blue), var(--violet)); }
.s-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.s-back { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 10px; color: var(--text-3); text-decoration: none; font-size: 13.5px; transition: color .25s, background .25s; }
.s-back:hover { color: var(--text); background: rgba(255, 255, 255, .04); }
.s-side { gap: 16px; padding-top: 22px; overflow-y: auto; overscroll-behavior: contain; scrollbar-width: none; }
.s-side::-webkit-scrollbar { display: none; }
.s-me { padding: 12px 10px; }
.s-nav { gap: 10px; }
.s-nav-g { display: flex; flex-direction: column; gap: 1px; }
.s-nav-t { margin: 0 0 4px; padding: 0 12px; font-size: 11.5px; letter-spacing: .32em; color: var(--text-3); }
.s-nav a { height: 36px; }
.s-nav a span { flex: 1; min-width: 0; }
.s-nav a em { font: 500 11.5px var(--font-latin); font-style: normal; color: var(--text-3); font-variant-numeric: tabular-nums; }
.s-nav a em.soon { padding: 1px 7px; border: 1px solid var(--line-2); border-radius: 999px; font-size: 9.5px; letter-spacing: .14em; }
.s-nav a.soon { color: var(--text-3); }
.s-side-foot { display: flex; flex-direction: column; gap: 12px; margin-top: auto; padding-top: 4px; }
.s-join {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  border: 1px solid var(--line-2);
  border-radius: 12px;
  background: linear-gradient(100deg, rgba(91, 140, 255, .12), rgba(180, 140, 255, .07) 55%, rgba(255, 122, 217, .07));
  color: var(--text);
  text-decoration: none;
  font-size: 13.5px;
  letter-spacing: .04em;
  transition: border-color .25s, transform .4s var(--ease-spring);
}
.s-join::after { content: ''; width: 7px; height: 7px; margin-left: auto; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); animation: blink 1.8s ease-in-out infinite; }
.s-join:hover { border-color: var(--text-3); transform: translateY(-1px); }
.s-join.on { border-color: var(--text-3); }
.s-scrim { display: none; }
/* 侧栏底部：登录了才出现 */
.s-user { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--text-3); }
.s-user a { display: inline-flex; flex: 1; align-items: center; gap: 8px; height: 38px; padding: 0 12px; border-radius: 10px; background: var(--card-2); color: var(--text); text-decoration: none; font-size: 13.5px; transition: background .25s; }
.s-user a:hover { background: var(--card-hover); }
.s-user a .ic { width: 16px; height: 16px; }
.s-user small { font: 11.5px var(--font-latin); }
.s-user button { border: 0; background: none; color: var(--text-3); font: 12.5px var(--font); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; transition: color .25s; }
.s-user button:hover { color: var(--text); }

/* ---------- 手机顶栏 ---------- */

.s-bar-r { display: flex; align-items: center; gap: 4px; }
.s-bar { display: none; }

/* ---------- 页头 ---------- */

.s-kicker { margin: 0 0 16px; font-size: 12.5px; letter-spacing: .34em; color: var(--text-3); }
.s-title { margin: 0; font: 800 clamp(34px, 3.8vw, 68px)/1.2 var(--font); letter-spacing: .04em; }
.s-lead { max-width: 36em; margin: 20px 0 0; font-size: clamp(15px, 1.05vw, 18px); line-height: 1.9; color: var(--text-2); }
.s-head { margin-bottom: clamp(28px, 4.5vh, 48px); }
.s-head .s-title { font-size: clamp(30px, 3vw, 52px); }
.s-head .s-title-ep { font-size: clamp(26px, 2.4vw, 42px); }
.s-kicker:has(.s-dot) { letter-spacing: .12em; }
.s-dot { display: inline-block; width: 8px; height: 8px; margin-right: 10px; border-radius: 50%; vertical-align: 1px; }
.s-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

/* ---------- 分区 ---------- */

.s-sec { margin-top: clamp(48px, 7vh, 84px); }
.s-sec-h { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 18px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.s-sec-h h2 { margin: 0; font-size: 18px; font-weight: 700; letter-spacing: .08em; }
.s-sec-h a { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-3); text-decoration: none; transition: color .25s; }
.s-sec-h a .ic { width: 15px; height: 15px; transition: transform .4s var(--ease-spring); }
.s-sec-h a:hover { color: var(--text); }
.s-sec-h a:hover .ic { transform: translateX(3px); }
.s-sec-sub { font-size: 13px; color: var(--text-3); }

/* ---------- 筛选 ---------- */

.s-filter { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 18px; }
.s-filter button {
  height: 32px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--text-2);
  font: 13px var(--font);
  letter-spacing: .04em;
  cursor: pointer;
  transition: color .25s, border-color .25s, background .25s;
}
.s-filter button:hover { color: var(--text); border-color: var(--line-2); }
.s-filter button.on { background: var(--btn-bg); color: var(--btn-ink); border-color: transparent; }

/* ---------- 返回链接 ---------- */

/* 单期视频、技能书详情页顶上的「返回」 */
.s-backlink { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 26px; font-size: 13.5px; color: var(--text-3); text-decoration: none; transition: color .25s; }
.s-backlink .ic { width: 16px; height: 16px; transition: transform .4s var(--ease-spring); }
.s-backlink:hover { color: var(--text); }
.s-backlink:hover .ic { transform: translateX(-3px); }

/* ---------- 我的台阶入口 ---------- */

.s-bar-my { display: inline-flex; align-items: center; gap: 6px; height: 34px; padding: 0 12px; border-radius: 10px; background: var(--card-2); color: var(--text); font-size: 13px; text-decoration: none; white-space: nowrap; }
.s-bar-my[hidden] { display: none; }
.s-bar-my .ic { width: 15px; height: 15px; }
.s-pulse { animation: s-pulse 1.2s ease-out 2; }
@keyframes s-pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--blue) 65%, transparent); }
  100% { box-shadow: 0 0 0 12px color-mix(in srgb, var(--blue) 0%, transparent); }
}
.s-tip {
  position: fixed;
  z-index: 40;
  display: grid;
  gap: 6px;
  width: 250px;
  padding: 14px 16px;
  border: 1px solid var(--line-2);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 20px 50px -18px rgba(0, 0, 0, .6);
  color: var(--text);
  animation: up .35s var(--ease-out);
}
.s-tip::before { content: ''; position: absolute; width: 10px; height: 10px; border: 1px solid var(--line-2); background: var(--panel); transform: rotate(45deg); }
.s-tip.side::before { left: -6px; bottom: 16px; border-width: 0 0 1px 1px; }
.s-tip.down::before { top: -6px; left: var(--ax, 50%); border-width: 1px 0 0 1px; }
.s-tip b { font-size: 14px; }
.s-tip span { font-size: 13px; line-height: 1.6; color: var(--text-2); }
.s-tip .s-btn { justify-self: end; margin-top: 4px; }

/* ---------- 白天 ---------- */

body.day #site {
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(91, 140, 255, .14), transparent 60%),
    radial-gradient(900px 520px at 0% 110%, rgba(180, 140, 255, .12), transparent 60%),
    #f5f6fa;
}
body.day .s-side { background: rgba(255, 255, 255, .6); }
body.day .s-nav a:hover, body.day .s-back:hover { background: rgba(20, 30, 60, .04); }
body.day .s-nav a.on { color: #10131d; background: rgba(20, 30, 60, .06); }
body.day .s-avatar { box-shadow: 0 0 0 2px #f5f6fa, 0 0 0 3px rgba(20, 30, 60, .14), 0 0 24px rgba(120, 140, 255, .3); }
body.day .s-bar { background: rgba(245, 246, 250, .85); }

@media (min-width: 821px) {
  .s-side { z-index: 2; }
}

@media (min-width: 821px) and (max-height: 860px) {
  .s-side { gap: 12px; padding-top: 16px; padding-bottom: 16px; }
  .s-me { padding: 8px 10px; }
  .s-avatar { width: 34px; height: 34px; }
  .s-nav { gap: 6px; }
  .s-nav a { height: 31px; font-size: 14px; }
  .s-nav-t { margin-bottom: 2px; font-size: 11px; }
  .s-side-foot { gap: 8px; }
  .s-join { padding: 8px 12px; }
  .s-back { padding: 8px 12px; }
}

@media (min-width: 821px) and (max-height: 760px) {
  .s-me { display: none; }
  .s-nav a { height: 28px; font-size: 13.5px; }
  .s-nav-t { font-size: 10.5px; }
  .s-back { padding: 6px 12px; }
}

@media (max-width: 820px) {
  #site { grid-template-columns: minmax(0, 1fr); }
  .s-side {
      position: fixed;
      z-index: 20;
      left: 0;
      top: 0;
      bottom: 0;
      width: min(300px, 84vw);
      height: auto;
      background: #07080f;
      transform: translateX(-102%);
      transition: transform .45s var(--ease-out);
    }
  #site.nav-open .s-side { transform: none; box-shadow: 20px 0 60px rgba(0, 0, 0, .6); }
  body.day .s-side { background: #fff; }
  body.day #site.nav-open .s-side { box-shadow: 20px 0 60px rgba(20, 30, 60, .18); }
  .s-bar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; background: rgba(5, 6, 11, .82); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
  .s-menu { display: grid; place-items: center; width: 40px; height: 40px; border: 0; background: none; color: var(--text); }
  .s-main { padding: 34px 20px 70px; }
  .s-scrim { position: fixed; inset: 0; z-index: 15; display: block; background: rgba(0, 0, 0, .5); opacity: 0; pointer-events: none; transition: opacity .35s; }
  #site.nav-open .s-scrim { opacity: 1; pointer-events: auto; }
  body.day .s-scrim { background: rgba(20, 23, 34, .25); }
}

@media (max-width: 480px) {
  .s-bar .s-brand { padding: 0 4px; white-space: nowrap; }
}