/* deluAgent 聚合站 — Studio Atelier */

:root {
  /* 默认变量由 [data-theme="dark"] / [data-theme="light"] 覆盖 */
  --font-display: "Fraunces", "Times New Roman", serif;
  --font-body: "Geist", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --max: 1280px;
  --pad: clamp(20px, 4vw, 56px);
  --grain-opacity: 0.045;
  --grain-blend: overlay;
  --aurora-orange: rgba(255, 91, 31, 0.12);
  --aurora-blue: rgba(122, 168, 255, 0.10);
  --aurora-paper: rgba(243, 237, 225, 0.05);
  --topbar-bg: rgba(10, 10, 11, 0.72);
}

/* === Dark (default) === */
:root,
:root[data-theme="dark"] {
  --bg: #0a0a0b;
  --bg-soft: #111114;
  --paper: #f3ede1;
  --paper-dim: rgba(243, 237, 225, 0.62);
  --paper-faint: rgba(243, 237, 225, 0.16);
  --line: rgba(243, 237, 225, 0.12);
  --line-strong: rgba(243, 237, 225, 0.28);
  --accent: #ff5b1f;
  --accent-soft: rgba(255, 91, 31, 0.18);
  --live: #88f5d3;
  --wip: #f7d272;
  --internal: #7aa8ff;
  --topbar-bg: rgba(10, 10, 11, 0.72);
  --grain-opacity: 0.045;
  --grain-blend: overlay;
  --aurora-orange: rgba(255, 91, 31, 0.12);
  --aurora-blue: rgba(122, 168, 255, 0.10);
  --aurora-paper: rgba(243, 237, 225, 0.05);
  color-scheme: dark;
}

/* === Light (paper / atelier day) === */
:root[data-theme="light"] {
  --bg: #ede5d2;            /* 暖米色纸 */
  --bg-soft: #e3dbc6;
  --paper: #1a1612;          /* 暖近黑 */
  --paper-dim: rgba(26, 22, 18, 0.66);
  --paper-faint: rgba(26, 22, 18, 0.22);
  --line: rgba(26, 22, 18, 0.14);
  --line-strong: rgba(26, 22, 18, 0.32);
  --accent: #c43d10;
  --accent-soft: rgba(196, 61, 16, 0.15);
  --live: #0f7a52;
  --wip: #a07000;
  --internal: #2a5fcc;
  --topbar-bg: rgba(237, 229, 210, 0.78);
  --grain-opacity: 0.10;
  --grain-blend: multiply;
  --aurora-orange: rgba(196, 61, 16, 0.10);
  --aurora-blue: rgba(42, 95, 204, 0.08);
  --aurora-paper: rgba(26, 22, 18, 0.03);
  color-scheme: light;
}

/* 颜色/边框平滑过渡（在不支持 View Transitions 的浏览器上也会拿到体面的动画） */
:root,
body,
.topbar,
.card,
.card__name,
.card__tag,
.topbar__nav a,
.aurora,
.grain {
  transition:
    background-color 0.5s ease,
    color 0.5s ease,
    border-color 0.5s ease;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

::selection {
  background: var(--accent);
  color: var(--bg);
}

.mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  font-feature-settings: "tnum", "zero";
}

.italic {
  font-style: italic;
}

/* ===== Background atmosphere ===== */
.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: var(--grain-opacity);
  mix-blend-mode: var(--grain-blend);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 0.7 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

.aurora {
  pointer-events: none;
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 70vh;
  z-index: 0;
  background:
    radial-gradient(60% 80% at 18% 10%, var(--aurora-orange), transparent 60%),
    radial-gradient(55% 75% at 90% 18%, var(--aurora-blue), transparent 60%),
    radial-gradient(70% 90% at 50% 0%, var(--aurora-paper), transparent 70%);
  filter: blur(40px);
}

/* ===== Topbar ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px var(--pad);
  background: var(--topbar-bg);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line);
}

.topbar__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
}

.topbar__mark span {
  margin: 0 4px;
  color: var(--paper-dim);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  display: inline-block;
}

.dot--live {
  background: var(--live);
  box-shadow: 0 0 12px var(--live), 0 0 4px var(--live);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.6;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.18);
  }
}

.topbar__nav {
  display: flex;
  gap: 28px;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.topbar__nav a {
  color: var(--paper-dim);
  transition: color 0.2s ease;
  position: relative;
}

.topbar__nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.topbar__nav a:hover {
  color: var(--paper);
}

.topbar__nav a:hover::after {
  transform: scaleX(1);
}

.topbar__meta {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  font-size: 12px;
  color: var(--paper-dim);
}

/* ===== Hamburger menu ===== */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  cursor: pointer;
  order: 2;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--paper-dim);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.menu-toggle.is-open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.menu-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 720px) {
  .menu-toggle {
    display: flex;
  }

  .topbar {
    flex-wrap: wrap;
  }

  .topbar__nav {
    display: none;
    width: 100%;
    order: 10;
    flex-direction: column;
    gap: 12px;
    padding: 16px 0 8px;
    border-top: 1px solid var(--line);
  }

  .topbar__nav.is-open {
    display: flex;
  }

  .topbar__nav a {
    padding: 8px 0;
    font-size: 15px;
  }

  .topbar__meta {
    order: 3;
    margin-left: auto;
  }
}

/* ===== Theme toggle ===== */
.theme-toggle {
  --thumb-x: 0;
  appearance: none;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 4px 10px 4px 10px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--paper-dim);
  transition: border-color 0.3s ease, color 0.3s ease, background 0.3s ease;
  user-select: none;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--paper);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle__side {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.3s ease, opacity 0.3s ease;
  opacity: 0.6;
}

.theme-toggle__side svg {
  display: block;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

[data-theme="light"] .theme-toggle__side--day,
[data-theme="dark"] .theme-toggle__side--night {
  color: var(--accent);
  opacity: 1;
}

[data-theme="light"] .theme-toggle__side--day svg {
  transform: rotate(45deg);
}

[data-theme="dark"] .theme-toggle__side--night svg {
  transform: rotate(-12deg);
}

.theme-toggle__track {
  position: relative;
  width: 28px;
  height: 14px;
  border-radius: 999px;
  background: var(--line);
  border: 1px solid var(--line-strong);
  overflow: hidden;
}

.theme-toggle__thumb {
  position: absolute;
  top: 1px;
  left: 1px;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  transform: translateX(var(--thumb-x));
  transition: transform 0.45s cubic-bezier(0.34, 1.4, 0.64, 1);
}

[data-theme="dark"] .theme-toggle {
  --thumb-x: 14px;
}

[data-theme="light"] .theme-toggle {
  --thumb-x: 0px;
}

#clock {
  min-width: 72px;
  text-align: right;
}

/* ===== Shell ===== */
.shell {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(48px, 8vw, 96px) var(--pad) 64px;
}

/* ===== Hero ===== */
.hero {
  padding: 32px 0 64px;
  border-bottom: 1px solid var(--line);
}

.hero__overline {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: var(--paper-dim);
  margin-bottom: 32px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero__overline span:nth-child(2) {
  color: var(--paper-faint);
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(48px, 14vw, 196px);
  line-height: 0.88;
  letter-spacing: -0.04em;
  margin: 0 0 14px;
  font-variation-settings: "opsz" 144;
}

.hero__word {
  display: inline-block;
  opacity: 0;
  transform: translateY(28px);
  animation: rise 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

.hero__word.italic {
  font-style: italic;
  color: var(--accent);
  font-variation-settings: "opsz" 144, "wght" 500;
  margin-left: 4px;
  animation-delay: 0.14s;
}

.hero__word.small {
  display: block;
  font-size: clamp(16px, 0.28em, 54px);
  font-style: italic;
  letter-spacing: 0.02em;
  color: var(--paper-dim);
  margin-top: 12px;
  animation-delay: 0.32s;
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__lede {
  max-width: 56ch;
  color: var(--paper-dim);
  font-size: clamp(14px, 1.2vw, 17px);
  line-height: 1.65;
  margin: 0 0 32px;
  opacity: 0;
  animation: rise 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) 0.5s forwards;
}

.hero__rule {
  display: flex;
  gap: 8px;
  height: 4px;
  opacity: 0;
  animation: rise 0.8s ease 0.7s forwards;
}

.hero__rule span {
  height: 100%;
  border-radius: 2px;
}

.hero__rule span:nth-child(1) {
  flex: 0 0 18%;
  background: var(--accent);
}

.hero__rule span:nth-child(2) {
  flex: 0 0 6%;
  background: var(--paper);
}

.hero__rule span:nth-child(3) {
  flex: 1;
  background: var(--line-strong);
}

/* ===== Sections ===== */
.sections {
  display: flex;
  flex-direction: column;
  gap: 96px;
  margin-top: 80px;
}

.section {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(0, 2.6fr);
  gap: 56px;
  scroll-margin-top: 80px;
}

@media (max-width: 880px) {
  .section {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

.section__head {
  position: sticky;
  top: 84px;
  align-self: start;
  height: max-content;
}

@media (max-width: 880px) {
  .section__head {
    position: static;
  }
}

.section__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--paper-faint);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.section__num::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.section__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--paper-dim);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section__title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(34px, 4.4vw, 56px);
  line-height: 1;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  font-variation-settings: "opsz" 96;
}

.section__summary {
  color: var(--paper-dim);
  font-size: 14px;
  line-height: 1.6;
  max-width: 32ch;
}

/* ===== Cards ===== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: 1px;
  background: transparent;
  border: 0;
  border-radius: 2px;
  overflow: visible;
}

.card {
  position: relative;
  background: var(--bg);
  box-shadow: 0 0 0 1px var(--line);
  padding: 24px 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 200px;
  transition: background 0.3s ease;
  isolation: isolate;
  overflow: hidden;
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid transparent;
  pointer-events: none;
  transition: border-color 0.25s ease;
  z-index: 1;
}

.card:hover {
  background: var(--bg-soft);
}

.card:hover::after {
  border-color: var(--accent-soft);
}

.card__spot {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.35s ease;
  background: radial-gradient(
    220px 160px at var(--mx, 50%) var(--my, 50%),
    rgba(255, 91, 31, 0.16),
    transparent 70%
  );
  z-index: 0;
}

.card:hover .card__spot {
  opacity: 1;
}

.card > * {
  position: relative;
  z-index: 2;
}

.card__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.card__id {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--paper-faint);
}

.card__status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper-dim);
}

.card__status .dot {
  width: 6px;
  height: 6px;
}

.card__status--live .dot {
  background: var(--live);
  box-shadow: 0 0 8px var(--live);
}

.card__status--wip .dot {
  background: var(--wip);
  box-shadow: 0 0 8px var(--wip);
}

.card__status--internal .dot {
  background: var(--internal);
  box-shadow: 0 0 8px var(--internal);
}

.card__name {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0;
  font-variation-settings: "opsz" 72;
  transition: font-style 0.3s ease, color 0.3s ease;
}

.card:hover .card__name {
  font-style: italic;
  color: var(--paper);
}

.card__tagline {
  color: var(--paper-dim);
  font-size: 13.5px;
  line-height: 1.55;
  margin: 0;
  flex: 1;
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.card__tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 8px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--paper-dim);
}

.card__foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.card__entry {
  color: var(--paper-dim);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  letter-spacing: 0.16em;
  white-space: nowrap;
}

.card__entry::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--accent);
  opacity: 0.72;
}

.card__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.card__cta .arrow {
  display: inline-block;
  transition: transform 0.25s ease;
}

.card:hover .card__cta .arrow {
  transform: translateX(4px);
}

/* Card link covers whole area */
.card__link {
  appearance: none;
  border: 0;
  background: transparent;
  cursor: pointer;
  position: absolute;
  inset: 0;
  z-index: 3;
  padding: 0;
  color: inherit;
}

.card__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -4px;
}

/* ===== Footer ===== */
.footer {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  padding: 56px 0 24px;
  margin-top: 96px;
  border-top: 1px solid var(--line);
  color: var(--paper-dim);
}

.footer__label {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--paper-faint);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.footer__value {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 19px;
  color: var(--paper);
  letter-spacing: -0.01em;
}

/* ===== Staggered card reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== View Transitions: 从按钮位置圆形扩散揭示新主题 ===== */
@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
    mix-blend-mode: normal;
  }
  ::view-transition-old(root) {
    z-index: 1;
  }
  ::view-transition-new(root) {
    z-index: 2;
    animation: theme-reveal 0.75s cubic-bezier(0.65, 0, 0.35, 1) both;
  }
  @keyframes theme-reveal {
    from {
      clip-path: circle(0% at var(--reveal-x, 100%) var(--reveal-y, 0%));
    }
    to {
      clip-path: circle(160% at var(--reveal-x, 100%) var(--reveal-y, 0%));
    }
  }
}

/* ===== Back to top (浮动右上角，与顶栏氛围一致) ===== */
.totop {
  position: fixed;
  top: 84px;
  right: clamp(16px, 3vw, 36px);
  width: 44px;
  height: 44px;
  border-radius: 999px;
  background: var(--topbar-bg);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border: 1px solid var(--line);
  color: var(--paper-dim);
  cursor: pointer;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 0;
  opacity: 0;
  transform: translateY(-10px);
  pointer-events: none;
  transition:
    opacity 0.45s ease,
    transform 0.45s cubic-bezier(0.2, 0.8, 0.2, 1),
    border-color 0.25s ease,
    color 0.25s ease,
    background-color 0.5s ease;
}

.totop.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.totop:hover {
  border-color: var(--accent);
  color: var(--paper);
}

.totop:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.totop__ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg); /* 起点从 12 点位 */
  pointer-events: none;
}

.totop__ring-bg {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 1;
}

.totop__ring-progress {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-dasharray: var(--circ, 126);
  stroke-dashoffset: var(--circ, 126);
  transition: stroke-dashoffset 0.15s linear, stroke 0.5s ease;
}

.totop__arrow {
  width: 14px;
  height: 14px;
  position: relative;
  z-index: 1;
  transform: translateY(-1px);
  transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.totop:hover .totop__arrow {
  transform: translateY(-3px);
}

@media (max-width: 720px) {
  .totop {
    top: 76px;
  }
}

/* ===== Mobile responsive enhancements ===== */
@media (max-width: 480px) {
  :root {
    --pad: 16px;
  }

  .hero {
    padding: 20px 0 40px;
  }

  .hero__overline {
    flex-wrap: wrap;
    gap: 6px 10px;
    font-size: 10px;
    margin-bottom: 20px;
  }

  .hero__title {
    margin-bottom: 10px;
  }

  .hero__word.small {
    margin-top: 8px;
  }

  .hero__lede {
    font-size: 14px;
    margin-bottom: 24px;
  }

  .sections {
    gap: 56px;
    margin-top: 48px;
  }

  .section {
    gap: 20px;
  }

  .section__title {
    font-size: clamp(28px, 8vw, 40px);
  }

  .card {
    padding: 20px 16px 16px;
    min-height: 180px;
  }

  .card__name {
    font-size: 22px;
  }

  .footer {
    gap: 20px;
    padding: 40px 0 20px;
    margin-top: 56px;
  }

  .footer__value {
    font-size: 16px;
  }

  .topbar__brand {
    font-size: 11px;
    gap: 8px;
  }

  .theme-toggle {
    padding: 3px 8px;
    gap: 6px;
  }

  #clock {
    display: none;
  }
}