/* ═══════════════════════════════════════════════
   KusanoYui — wjkusanoyui.com
   护眼浅色系 + 动态渐变背景
   ═══════════════════════════════════════════════ */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --c-ground: #f7f7f7;
  --c-ground-rgb: 247, 247, 247;
  --c-text: #1a1a1a;
  --c-text-2: #666;
  --c-text-3: #999;
  --c-accent: #1a1a1a;
  --c-accent-h: #444;
  --c-card: rgba(255, 255, 255, 0.7);
  --c-card-h: rgba(255, 255, 255, 0.9);
  --c-card-border: rgba(0, 0, 0, 0.15);
  --c-border: rgba(0, 0, 0, 0.06);

  --blob-1: rgba(220, 230, 245, 0.3);
  --blob-2: rgba(235, 220, 240, 0.2);
  --blob-3: rgba(220, 240, 225, 0.2);
  --blob-4: rgba(245, 230, 220, 0.2);

  --f-disp: Georgia, "Noto Serif SC", "Source Han Serif CN", serif;
  --f-body: system-ui, -apple-system, "Segoe UI", "PingFang SC",
            "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --max-w: 1100px;
  --nav-h: 60px;
  --r: 14px;
}

/* ── dark theme ── */
:root[data-theme="dark"] {
  --c-ground: #111;
  --c-ground-rgb: 17, 17, 17;
  --c-text: #eee;
  --c-text-2: #999;
  --c-text-3: #666;
  --c-accent: #eee;
  --c-accent-h: #ccc;
  --c-card: rgba(30, 30, 30, 0.6);
  --c-card-h: rgba(40, 40, 40, 0.7);
  --c-card-border: rgba(255, 255, 255, 0.18);
  --c-border: rgba(255, 255, 255, 0.06);
  --blob-1: rgba(40, 50, 70, 0.25);
  --blob-2: rgba(50, 35, 60, 0.2);
  --blob-3: rgba(35, 55, 40, 0.15);
  --blob-4: rgba(60, 45, 35, 0.15);
}

/* ── base ── */
html { scroll-behavior: smooth; }
body {
  font-family: var(--f-body); font-size: 1rem; line-height: 1.7;
  color: var(--c-text); background: var(--c-ground);
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }

/* ══════════════════════════════
   Animated blobs background
   ══════════════════════════════ */
.bg-blobs {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none; overflow: hidden;
}
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  will-change: transform;
}
.blob-1 {
  width: 600px; height: 600px;
  background: var(--blob-1);
  top: -10%; right: -5%;
  animation: drift1 20s ease-in-out infinite;
}
.blob-2 {
  width: 500px; height: 500px;
  background: var(--blob-2);
  top: 40%; left: -8%;
  animation: drift2 25s ease-in-out infinite;
}
.blob-3 {
  width: 450px; height: 450px;
  background: var(--blob-3);
  bottom: -5%; right: 20%;
  animation: drift3 22s ease-in-out infinite;
}
.blob-4 {
  width: 350px; height: 350px;
  background: var(--blob-4);
  top: 20%; left: 40%;
  animation: drift4 28s ease-in-out infinite;
}

@keyframes drift1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(-40px, 60px) scale(1.08); }
  50% { transform: translate(30px, 30px) scale(0.95); }
  75% { transform: translate(-20px, -40px) scale(1.03); }
}
@keyframes drift2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(50px, -30px) scale(0.93); }
  50% { transform: translate(-30px, 50px) scale(1.06); }
  75% { transform: translate(40px, 20px) scale(0.97); }
}
@keyframes drift3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-50px, -40px) scale(1.05); }
  66% { transform: translate(40px, -20px) scale(0.94); }
}
@keyframes drift4 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-60px, 40px) scale(1.1); }
}

/* ══════════════════════════════
   Navigation
   ══════════════════════════════ */
.nav {
  position: fixed; inset: 0 0 auto; height: var(--nav-h);
  z-index: 100; transition: background .3s, backdrop-filter .3s;
}
.nav.is-solid {
  background: rgba(var(--c-ground-rgb), 0.7);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.nav-brand {
  font-family: var(--f-disp); font-size: 1.125rem;
  letter-spacing: .03em; font-weight: 400;
}
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a {
  font-size: .8125rem; color: var(--c-text-2); letter-spacing: .02em;
  padding: .25rem 0; transition: color .2s;
}
.nav-links a:hover { color: var(--c-accent); }
.theme-toggle {
  background: none; border: none; color: var(--c-text-3);
  font-size: 1rem; padding: .25rem; transition: color .2s; line-height: 1;
}
.theme-toggle:hover { color: var(--c-text); }

/* ══════════════════════════════
   Content layer (above blobs)
   ══════════════════════════════ */
.content { position: relative; z-index: 1; }

/* ══════════════════════════════
   Hero
   ══════════════════════════════ */
.hero {
  min-height: 100vh; min-height: 100dvh;
  display: flex; align-items: center;
  text-align: center;
  padding-top: var(--nav-h);
}
.hero-inner { width: 100%; }
.hero-title {
  font-family: var(--f-disp);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 400; letter-spacing: .02em; line-height: 1.15;
  min-height: 1.2em;
}
.hero-title::after {
  content: '';
  display: inline-block;
  width: 3px; height: .9em;
  background: var(--c-text);
  margin-left: 4px;
  vertical-align: baseline;
  animation: blink .6s step-end infinite;
}
.hero-title.done::after { display: none; }
@keyframes blink { 50% { opacity: 0; } }
.hero-fade {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .6s ease, transform .6s ease;
}
.hero-fade.is-shown {
  opacity: 1;
  transform: translateY(0);
}
.hero-sub {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--c-text-2); margin-top: 1.25rem;
  letter-spacing: .04em; line-height: 1.8;
}
.hero-links {
  margin-top: 2.5rem; display: flex; gap: 1rem;
  justify-content: center; flex-wrap: wrap;
}
.hero-btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-size: .875rem; letter-spacing: .02em;
  padding: .65rem 1.5rem; border-radius: 100px;
  transition: all .25s ease;
}
.hero-btn-primary {
  background: var(--c-accent); color: #fff; border: none;
}
.hero-btn-primary:hover { background: var(--c-accent-h); transform: translateY(-1px); }
.hero-btn-ghost {
  background: var(--c-card); color: var(--c-text);
  border: 1px solid var(--c-card-border);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.hero-btn-ghost:hover { background: var(--c-card-h); transform: translateY(-1px); }

/* ══════════════════════════════
   Sections
   ══════════════════════════════ */
.section { padding: 6rem 0; }
.section-hd { margin-bottom: 2.5rem; text-align: center; }
.section-title {
  font-family: var(--f-disp);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400; letter-spacing: .01em;
}
.section-sub {
  color: var(--c-text-2); font-size: .9375rem;
  margin-top: .5rem; max-width: 480px; margin-left: auto; margin-right: auto;
}

.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ── Glass card base ── */
.glass {
  background: var(--c-card);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--c-card-border);
  border-radius: var(--r);
  transition: background .2s, transform .2s, box-shadow .2s;
}
.glass:hover {
  background: var(--c-card-h);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,.06);
}

/* ══════════════════════════════
   Tool section
   ══════════════════════════════ */
.tool-body {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 2rem; align-items: start;
}
.tool-desc { position: relative; }
.tool-desc p { color: var(--c-text-2); line-height: 1.85; margin-bottom: 1rem; }
.tool-desc p:last-child { margin-bottom: 0; }
.tool-desc .section-more { margin-top: 2.5rem; }
/* 桌面端：JS 会把链接绝对定位到与「自动更新」卡片垂直居中对齐 */
@media (min-width: 861px) {
  .tool-desc.js-aligned .section-more {
    position: absolute; left: 50%; transform: translateX(-50%);
    margin-top: 0; white-space: nowrap;
  }
}
.tool-platforms { display: flex; gap: .5rem; margin-top: 1.5rem; flex-wrap: wrap; }
.tool-platforms span {
  font-size: .75rem; padding: 4px 12px;
  background: var(--c-card); border: 1px solid var(--c-card-border);
  border-radius: 100px; color: var(--c-text-2); letter-spacing: .02em;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.tool-features { display: flex; flex-direction: column; gap: 1rem; }
.tool-feat { padding: 1.25rem 1.5rem; }
.tool-feat h3 { font-size: .9375rem; font-weight: 600; margin-bottom: .3rem; }
.tool-feat p { font-size: .8125rem; color: var(--c-text-2); line-height: 1.65; }
.section-more {
  display: inline-flex; align-items: center; gap: .4rem;
  margin-top: .6rem;
  font-size: .9rem; font-weight: 500;
  color: var(--c-text); text-decoration: none;
  padding: 7px 18px; border-radius: 100px;
  border: 1px solid var(--c-card-border);
  background: var(--c-card);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  transition: color .25s, border-color .25s, box-shadow .25s, transform .25s;
}
/* 非互动：箭头持续轻轻催动 */
.section-more .arrow {
  display: inline-block;
  animation: nudge 1.4s ease-in-out infinite;
}
@keyframes nudge {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(4px); }
}
/* 互动：渐变文字 + 箭头前冲 + 浮起 */
.section-more:hover {
  border-color: rgba(120, 90, 255, .4);
  box-shadow: 0 6px 20px rgba(120, 90, 255, .2);
  transform: translateY(-2px);
}
.section-more:hover .more-text {
  color: transparent;
  background-image: linear-gradient(90deg, #4a7bff, #a34dff, #ff4d88);
  -webkit-background-clip: text; background-clip: text;
}
.section-more:hover .arrow {
  animation: none;
  transform: translateX(6px);
  color: #ff4d88;
}

/* ══════════════════════════════
   Tutorial section
   ══════════════════════════════ */
.tut-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}
.tut-card { display: block; padding: 1.5rem; }
.tut-tag {
  font-size: .6875rem; color: var(--c-accent); letter-spacing: .06em;
  text-transform: uppercase; margin-bottom: .5rem; font-weight: 500;
}
.tut-card h3 { font-size: 1rem; font-weight: 500; line-height: 1.45; margin-bottom: .5rem; }
.tut-card p { font-size: .8125rem; color: var(--c-text-2); line-height: 1.65; }
.tut-soon {
  text-align: center; font-size: .8125rem;
  color: var(--c-text-3); margin-top: 1rem;
}

/* ══════════════════════════════
   Prompts section
   ══════════════════════════════ */
.prompt-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}
.prompt-card { padding: 1.25rem 1.5rem; position: relative; }
.prompt-card:hover { transform: none; }
.prompt-cat {
  display: inline-block; font-size: .6875rem; padding: 2px 10px;
  background: rgba(0, 0, 0, 0.05); color: var(--c-text);
  border-radius: 100px; margin-bottom: .75rem; letter-spacing: .02em; font-weight: 500;
}
.prompt-text {
  font-size: .8125rem; color: var(--c-text-2); line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 3;
  -webkit-box-orient: vertical; overflow: hidden;
}
.prompt-copy {
  position: absolute; top: 1rem; right: 1rem; background: var(--c-card);
  border: 1px solid var(--c-card-border); color: var(--c-text-3);
  font-size: .6875rem; padding: 3px 10px; border-radius: 100px;
  letter-spacing: .02em; transition: all .2s;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.prompt-copy:hover { color: var(--c-accent); border-color: var(--c-accent); }
.prompt-copy.is-copied { color: var(--c-accent); border-color: var(--c-accent); }
.prompt-note {
  margin-top: 1.5rem; display: flex; align-items: center; gap: .5rem;
  font-size: .8125rem; color: var(--c-text-3); justify-content: center;
}
.prompt-note .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--c-accent); opacity: .5;
}

/* ══════════════════════════════
   Community
   ══════════════════════════════ */
.community-body {
  padding: 3rem; text-align: center;
  max-width: 600px; margin: 0 auto;
}
.community-body p { color: var(--c-text-2); font-size: .9375rem; line-height: 1.8; }

/* ══════════════════════════════
   Footer
   ══════════════════════════════ */
.foot { padding: 2.5rem 0; }
.foot-inner { display: flex; justify-content: space-between; align-items: center; }
.foot-brand {
  font-family: var(--f-disp); font-size: .875rem;
  color: var(--c-text-3); letter-spacing: .04em;
}
.foot-right { font-size: .75rem; color: var(--c-text-3); }

/* ══════════════════════════════
   Responsive
   ══════════════════════════════ */
@media (max-width: 860px) { .tool-body { grid-template-columns: 1fr; } }
@media (max-width: 640px) {
  .nav-links { gap: 1.25rem; }
  .nav-links a { font-size: .75rem; }
  .section { padding: 4rem 0; }
  .tut-grid { grid-template-columns: 1fr; }
  .prompt-grid { grid-template-columns: 1fr; }
  .community-body { padding: 2rem 1.5rem; }
  .foot-inner { flex-direction: column; gap: .5rem; }
  .blob { filter: blur(60px); }
  .blob-1 { width: 350px; height: 350px; }
  .blob-2 { width: 300px; height: 300px; }
  .blob-3 { width: 250px; height: 250px; }
  .blob-4 { width: 200px; height: 200px; }
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .blob { animation: none !important; }
}