/* ==========================================================================
   友弟 — 深夜的低混合色溫
   室內鎢絲燈的暖側光，窗外都市的冷藍灰。
   改主題色只要動下面這幾個變數。
   ========================================================================== */

:root {
  /* 色彩 */
  --ink:        #0E1116;  /* 夜的底，帶藍不是純黑 */
  --ink-soft:   #141922;
  --haze:       #2A323D;  /* 窗外的冷灰藍 */
  --tungsten:   #E8B563;  /* 鎢絲燈，全站唯一暖色 */
  --tungsten-d: #A97F3E;
  --paper:      #C9CFD8;  /* 冷白，內文 */
  --paper-dim:  #79838F;

  /* 字體 */
  --display: "Noto Serif TC", "Songti TC", serif;
  --body: -apple-system, BlinkMacSystemFont, "Segoe UI",
          "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;

  /* 節奏 */
  --gutter: clamp(1.5rem, 6vw, 6rem);
  --measure: 34rem;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
}

/* --------------------------------------------------------------------------
   簽名元素：開燈
   兩層光源疊在整個視窗上。載入時鎢絲燈會閃兩下才穩定。
   -------------------------------------------------------------------------- */

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(90vw 85vh at 6% 12%,  rgba(232, 181, 99, .17), transparent 60%),
    radial-gradient(70vw 70vh at 96% 96%, rgba(42, 50, 61, .60),   transparent 62%);
  opacity: 0;
  animation: lamp-on 2.6s cubic-bezier(.2, .6, .2, 1) forwards;
}

@keyframes lamp-on {
  0%   { opacity: 0;   }
  10%  { opacity: .55; }
  16%  { opacity: .18; }
  26%  { opacity: .82; }
  32%  { opacity: .5;  }
  100% { opacity: 1;   }
}

body > * { position: relative; z-index: 1; }

/* --------------------------------------------------------------------------
   導覽
   -------------------------------------------------------------------------- */

.nav {
  padding: clamp(1.25rem, 4vw, 2.5rem) var(--gutter);
}

.nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  gap: clamp(1.25rem, 4vw, 2.25rem);
  justify-content: flex-end;
}

.nav a {
  color: var(--paper-dim);
  text-decoration: none;
  font-size: .8125rem;
  letter-spacing: .18em;
  transition: color .35s ease;
}

.nav a:hover,
.nav a:focus-visible { color: var(--tungsten); }

.nav a[aria-current="page"] { color: var(--paper); }

/* --------------------------------------------------------------------------
   版面骨架
   -------------------------------------------------------------------------- */

.stage {
  flex: 1;
  display: flex;
  padding: 0 var(--gutter);
}

.page-home .stage {
  align-items: flex-end;
  padding-bottom: clamp(3rem, 12vh, 8rem);
}

.page-inner .stage {
  align-items: flex-start;
  padding-top: clamp(2rem, 8vh, 5rem);
  padding-bottom: clamp(3rem, 10vh, 6rem);
}

/* --------------------------------------------------------------------------
   首頁名片
   名字靠左靠下，不置中——光是從左上打過來的。
   -------------------------------------------------------------------------- */

.wordmark {
  margin: 0;
  font-family: var(--display);
  font-weight: 200;
  font-size: clamp(4.5rem, 17vw, 11rem);
  line-height: .95;
  letter-spacing: .06em;
  /* 側光：字的左邊被燈打到，右邊落回冷色 */
  background: linear-gradient(102deg, #F6DFB4 0%, #E3D3BC 22%, var(--paper) 58%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.role {
  margin: 1.5rem 0 0;
  color: var(--tungsten);
  font-size: .8125rem;
  letter-spacing: .34em;
}

.line {
  margin: 1.75rem 0 0;
  max-width: var(--measure);
  color: var(--paper-dim);
  font-size: .9375rem;
  line-height: 2;
}

/* --------------------------------------------------------------------------
   內頁文章
   -------------------------------------------------------------------------- */

.prose {
  /* .stage 是 flex,.prose 沒給寬度就會縮成「內容寬」。
     links.html 的項目短,整欄會被擠窄,.link-list 的 space-between 也就失效。 */
  width: 100%;
  max-width: var(--measure);
}

.prose h1 {
  margin: 0 0 2.5rem;
  font-family: var(--display);
  font-weight: 200;
  font-size: clamp(2.5rem, 8vw, 4rem);
  line-height: 1.1;
  letter-spacing: .08em;
  color: var(--paper);
}

.prose h2 {
  margin: 3.5rem 0 1rem;
  font-size: .8125rem;
  font-weight: 500;
  letter-spacing: .3em;
  color: var(--tungsten);
}

.prose p {
  margin: 0 0 1.5rem;
  color: var(--paper-dim);
}

.prose .lead {
  color: var(--paper);
  font-family: var(--display);
  font-weight: 300;
  font-size: 1.25rem;
  line-height: 1.9;
  margin-bottom: 2.5rem;
}

.prose a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--tungsten-d);
  padding-bottom: 1px;
  transition: color .3s ease, border-color .3s ease;
}

.prose a:hover,
.prose a:focus-visible {
  color: var(--tungsten);
  border-color: var(--tungsten);
}

/* --------------------------------------------------------------------------
   工作範圍 / 器材
   -------------------------------------------------------------------------- */

.work {
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}

.work li {
  /* 5.5em = .work strong 的標籤欄寬。器材那幾行會折行,
     懸掛縮排讓折下來的行對齊內容欄,不會鑽到標籤底下。 */
  padding: .5rem 0 .5rem 5.5em;
  text-indent: -5.5em;
  color: var(--paper-dim);
  border-top: 1px solid rgba(121, 131, 143, .12);
}

.work li:first-child { border-top: 0; }

.work strong {
  display: inline-block;
  min-width: 5.5em;
  text-indent: 0;              /* 擋掉 .work li 的懸掛縮排繼承 */
  color: var(--paper);
  font-weight: 400;
  letter-spacing: .1em;
}

/* --------------------------------------------------------------------------
   連結清單
   -------------------------------------------------------------------------- */

.link-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.link-list li + li {
  border-top: 1px solid rgba(121, 131, 143, .16);
}

.link-list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.15rem 0;
  border-bottom: 0;
  color: var(--paper);
  text-decoration: none;
  transition: color .3s ease, padding-left .3s ease;
}

.link-list a:hover,
.link-list a:focus-visible {
  color: var(--tungsten);
  padding-left: .5rem;
}

.link-name { font-size: 1rem; }

.link-note {
  flex: none;
  font-size: .75rem;
  letter-spacing: .2em;
  color: var(--paper-dim);
}

/* --------------------------------------------------------------------------
   頁尾社群
   -------------------------------------------------------------------------- */

.dock {
  padding: clamp(1.5rem, 5vw, 3rem) var(--gutter) clamp(2rem, 5vw, 3rem);
}

.dock .social {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.dock .social a {
  color: var(--paper-dim);
  text-decoration: none;
  font-size: .75rem;
  letter-spacing: .16em;
  transition: color .3s ease;
}

.dock .social a:hover,
.dock .social a:focus-visible { color: var(--tungsten); }

/* --------------------------------------------------------------------------
   進場:燈亮之後,東西才一件一件浮出來
   只動 opacity 與 transform——這兩個走合成層,不觸發 layout 或 paint,
   所以整段動畫的成本接近零,沒有 JS、沒有額外請求。
   -------------------------------------------------------------------------- */

@keyframes rise {
  from { opacity: 0; transform: translateY(.6rem); }
  to   { opacity: 1; transform: none;              }
}

@keyframes fade {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* 內容會位移,所以只給版心裡的東西 */
.card > *,
.prose > * {
  animation: rise .7s cubic-bezier(.2, .7, .2, 1) both;
}

/* 選單與頁尾只淡入,不位移——它們貼在版面頭尾,
   往下推 .6rem 會把文件撐高,首頁在手機直式下就會多出一段捲動。 */
.nav,
.dock {
  animation: fade .7s ease both;
}

/* 首頁:名字先亮,職稱與那行字跟上,選單與頁尾殿後 */
.card .wordmark { animation-delay: .20s; }
.card .role     { animation-delay: .35s; }
.card .line     { animation-delay: .45s; }

/* 內頁:標題到內文,間隔比首頁短,讀的人不用等 */
.prose > *:nth-child(1)   { animation-delay: .15s; }
.prose > *:nth-child(2)   { animation-delay: .20s; }
.prose > *:nth-child(3)   { animation-delay: .25s; }
.prose > *:nth-child(n+4) { animation-delay: .30s; }

.nav  { animation-delay: .55s; }
.dock { animation-delay: .62s; }

/* --------------------------------------------------------------------------
   無障礙
   -------------------------------------------------------------------------- */

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
}

.skip:focus {
  left: var(--gutter);
  top: .75rem;
  z-index: 10;
  background: var(--ink-soft);
  color: var(--tungsten);
  padding: .6rem 1rem;
  font-size: .8125rem;
  text-decoration: none;
}

:focus-visible {
  outline: 1px solid var(--tungsten);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  body::before { animation: none; opacity: 1; }

  /* 進場動畫整組關掉,而且要保證東西是看得見的——
     fill-mode: both 會把元素停在 opacity 0,不覆寫就會整頁空白。 */
  .nav,
  .card > *,
  .prose > *,
  .dock {
    animation: none;
    opacity: 1;
    transform: none;
  }

  * { transition-duration: .01ms !important; }
}

/* --------------------------------------------------------------------------
   窄螢幕
   -------------------------------------------------------------------------- */

@media (max-width: 480px) {
  .nav ul { justify-content: flex-start; }
  .wordmark { letter-spacing: .04em; }
  .line { font-size: .875rem; }
}