/* ==========================================================================
   FTCD studio · 子页面通用外壳
   与主站同一套 token：近黑底 + 象牙白正文 + 朱砂/石青/桃夭三色点
   所有子页面只依赖这一个文件，不引外链、不引第三方库
   ========================================================================== */

:root {
  --bg: #0a0a0b;
  --ink: #f4f1ec;
  --ink-2: #a6a29b;
  --ink-3: #6f6b65;
  --line: rgba(255, 255, 255, .12);
  --line-2: rgba(255, 255, 255, .06);

  --zhu: #e8382d;
  --qing: #45a9bf;
  --tao: #ef7f92;

  --serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "SimSun", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --t-sm: clamp(0.7813rem, 0.766rem + 0.078vi, 0.8125rem);
  --t-base: clamp(0.875rem, 0.86rem + 0.09vi, 0.9375rem);
  --t-md: clamp(1rem, 0.96rem + 0.18vi, 1.0625rem);
  --t-lg: clamp(1.25rem, 1.15rem + 0.5vi, 1.5rem);
  --t-xl: clamp(1.625rem, 1.35rem + 1.3vi, 2.5rem);

  --pw: 900px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--t-base);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

h1, h2, h3, p { margin: 0; font-weight: 400; }

::selection { background: var(--zhu); color: #fff; }

:focus-visible { outline: 1px solid var(--zhu); outline-offset: 3px; }

/* ------------------------------------------------------------------ 顶栏 */
.pnav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(10, 10, 11, .94);
  border-bottom: 1px solid var(--line);
}

.pnav-in {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: var(--pw);
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
}

.pbrand {
  font-family: var(--serif);
  font-size: 15px;
  letter-spacing: .14em;
  white-space: nowrap;
}

.pbrand em {
  font-family: var(--mono);
  font-style: normal;
  font-size: 9px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-left: 7px;
}

.pname {
  margin-left: auto;
  font-size: var(--t-sm);
  letter-spacing: .12em;
  color: var(--ink-2);
  white-space: nowrap;
}

.pname em {
  font-family: var(--mono);
  font-style: normal;
  font-size: 8.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-left: 8px;
}

.pback {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--ink-3);
  padding: 5px 9px;
  border: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
  white-space: nowrap;
}

.pback:hover { color: var(--ink); border-color: var(--line); }

/* ------------------------------------------------------------ 内容容器 */
.pwrap {
  flex: 1;
  width: 100%;
  max-width: var(--pw);
  margin: 0 auto;
  padding: 44px 24px 72px;
}

.pwrap.narrow { max-width: 720px; }
.pwrap.wide { max-width: 1120px; }
.pwrap.center { text-align: center; }

.p-kicker {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--zhu);
}

.p-title {
  margin: 12px 0 0;
  font-family: var(--serif);
  font-size: var(--t-xl);
  line-height: 1.3;
  letter-spacing: .02em;
}

.p-lede {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: var(--t-sm);
  line-height: 1.9;
  color: var(--ink-2);
}

.pwrap.center .p-lede { margin-left: auto; margin-right: auto; }

.p-head { margin-bottom: 30px; }

/* ------------------------------------------------------------------ 面板 */
.pcard {
  position: relative;
  padding: 24px 24px 26px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, .022), transparent 62%);
}

.pcard + .pcard { margin-top: 14px; }

.pcard-h {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.pcard-h::before {
  content: "";
  width: 5px; height: 5px;
  background: var(--zhu);
  transform: rotate(45deg);
  flex: none;
}

.pcard-h i {
  margin-left: auto;
  font-style: normal;
  letter-spacing: .1em;
  color: var(--ink-3);
}

.divider {
  height: 1px;
  margin: 26px 0;
  background: var(--line);
}

/* ------------------------------------------------------------------ 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-family: inherit;
  font-size: var(--t-sm);
  letter-spacing: .12em;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: background .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease), color .2s var(--ease);
  -webkit-appearance: none;
}

.btn:hover { border-color: rgba(255, 255, 255, .3); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-main {
  background: var(--zhu);
  border-color: var(--zhu);
  color: #fff;
}

.btn-main:hover { background: #f04a3f; border-color: #f04a3f; }

.btn-sm { padding: 6px 14px; font-size: 12px; letter-spacing: .08em; }

.btn[disabled], .btn.is-off {
  opacity: .4;
  cursor: not-allowed;
  transform: none;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ------------------------------------------------------------------ 表单 */
.field { display: block; margin-top: 18px; }

.field > span {
  display: block;
  margin-bottom: 7px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.inp,
.ta {
  display: block;
  width: 100%;
  padding: 11px 13px;
  font-family: inherit;
  font-size: var(--t-base);
  line-height: 1.7;
  color: var(--ink);
  background: rgba(255, 255, 255, .03);
  border: 1px solid var(--line);
  border-radius: 0;
  transition: border-color .2s var(--ease), background .2s var(--ease);
  -webkit-appearance: none;
}

.inp::placeholder, .ta::placeholder { color: var(--ink-3); }

.inp:focus,
.ta:focus {
  outline: none;
  border-color: var(--zhu);
  background: rgba(255, 255, 255, .05);
}

.ta {
  resize: vertical;
  min-height: 140px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-all;
}

.hint {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.8;
  color: var(--ink-3);
}

/* ------------------------------------------------------------------ 数值 */
.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
}

.stat { min-width: 92px; }

.stat span {
  display: block;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.stat b {
  display: block;
  margin-top: 3px;
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: .02em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.stat.accent b { color: var(--zhu); }
.stat.qing b { color: var(--qing); }
.stat.tao b { color: var(--tao); }

.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* -------------------------------------------------------------- 分段选择 */
.seg {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.seg a,
.seg button {
  padding: 5px 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--ink-3);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.seg a:hover,
.seg button:hover { color: var(--ink); border-color: rgba(255, 255, 255, .28); }

.seg a.on,
.seg button.on {
  color: #fff;
  background: var(--zhu);
  border-color: var(--zhu);
}

/* ------------------------------------------------------------------ 舞台 */
.stage {
  display: flex;
  justify-content: center;
  margin-top: 6px;
}

.stage canvas,
.stage svg {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: #08080a;
}

/* ------------------------------------------------------------------ 列表 */
.plist { margin: 0; padding: 0; list-style: none; }

.plist li,
.plist > a {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 10px;
  padding: 11px 9px;
  margin: 0 -9px;
  border-bottom: 1px solid var(--line-2);
  transition: background .2s var(--ease);
}

.plist li b,
.plist > a b {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  color: var(--ink-3);
}

.plist > a:hover { background: rgba(255, 255, 255, .03); }

.plist em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ------------------------------------------------------------------ 杂项 */
.tag {
  display: inline-block;
  padding: 1px 7px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .14em;
  color: var(--ink-3);
  border: 1px solid var(--line);
}

.notice {
  display: flex;
  gap: 10px;
  padding: 14px 16px;
  margin-top: 18px;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--zhu);
  background: rgba(255, 255, 255, .018);
}

.notice.qing { border-left-color: var(--qing); }
.notice.tao { border-left-color: var(--tao); }

kbd {
  display: inline-block;
  min-width: 20px;
  padding: 1px 6px;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.7;
  color: var(--ink-2);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  text-align: center;
}

.img-fit {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.grid2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.grid3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

/* ------------------------------------------------------------------ 页脚 */
.pfoot {
  border-top: 1px solid var(--line);
}

.pfoot-in {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  width: 100%;
  max-width: var(--pw);
  margin: 0 auto;
  padding: 18px 24px 24px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--ink-3);
}

.pfoot-in a:hover { color: var(--ink-2); }

/* ---------------------------------------------------------------- 动画 */
@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}

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

@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(0, -3%, 0) scale(1.07); }
}

@keyframes sheen {
  from { background-position: -160% 0; }
  to { background-position: 260% 0; }
}

/* 背景两团极淡色雾，缓慢漂移（fixed 层，不产生滚动条） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(46vw 36vw at 14% 4%, rgba(232, 56, 45, .10), transparent 64%),
    radial-gradient(40vw 34vw at 88% 26%, rgba(69, 169, 191, .085), transparent 66%);
  animation: drift 46s ease-in-out infinite alternate;
}

/* 进场：给任意块加 .anim，用 style="--d:0/1/2" 错峰 */
.anim {
  animation: rise .8s var(--ease) both;
  animation-delay: calc(var(--d, 0) * 90ms + 40ms);
}

/* 滚动出现：加 .reveal，出现的项自动错开 */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .65s var(--ease), transform .65s var(--ease);
  transition-delay: calc(var(--i, 0) * 70ms);
}

.reveal.in {
  opacity: 1;
  transform: none;
}

/* 顶栏滑下 */
.pnav { animation: rise .5s var(--ease) both; }

/* 主按钮掠过一道高光 */
.btn-main {
  position: relative;
  overflow: hidden;
  background-image: linear-gradient(100deg, transparent 38%, rgba(255, 255, 255, .22) 50%, transparent 62%);
  background-size: 220% 100%;
  background-repeat: no-repeat;
}

.btn-main:hover { animation: sheen 1.1s var(--ease); }

/* 面板 hover 微抬 */
.pcard {
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

@media (hover: hover) {
  .pcard:hover { border-color: rgba(255, 255, 255, .2); }
}

@media (prefers-reduced-motion: reduce) {
  body::before { animation: none; }
  .anim { animation: none; opacity: 1; transform: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .pnav { animation: none; }
  .btn-main:hover { animation: none; }
  .pcard { transition: none; }
}

/* ---------------------------------------------------------------- 响应式 */
@media (max-width: 640px) {
  .pnav-in { padding: 0 16px; height: 52px; gap: 8px; }
  .pbrand em { display: none; }
  .pname em { display: none; }
  .pwrap { padding: 30px 16px 54px; }
  .pcard { padding: 18px 16px 20px; }
  .grid2, .grid3 { grid-template-columns: 1fr; }
  .pfoot-in { padding: 16px 16px 20px; }
  .stat b { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  .btn, .btn:hover, .pback, .seg a, .seg button, .plist > a { transition: none; }
}