/* =============================================
   PetClaw Homepage — 手绘手账 · 赛璐璃风格
   ============================================= */

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

:root {
  --clr-primary: #FF8C42;
  --clr-primary-dark: #D96A20;
  --clr-primary-light: #FFB27A;
  --clr-purple: #8B5CF6;
  --clr-green: #3EC98B;
  --clr-pink: #F472B6;

  --ink: #2A2A2A;
  --ink-light: #5C5347;
  --ink-faint: rgba(42, 42, 42, 0.08);
  --paper: #FBF6EE;
  --paper-warm: #FFF3E4;
  --paper-alt: #F5EFE6;

  --border: 2.5px solid var(--ink);
  --radius: 18px 4px 16px 6px / 6px 16px 4px 18px;
  --radius-sm: 10px 3px 8px 4px / 4px 8px 3px 10px;
  --shadow: 4px 4px 0 var(--ink);
  --shadow-sm: 2px 2px 0 var(--ink);
  --shadow-soft: 3px 3px 0 rgba(42,42,42,0.12);

  --ease: cubic-bezier(0.34, 1.56, 0.64, 1);
  --font-display: 'ZCOOL KuaiLe', cursive;
  --font-body: 'Noto Sans SC', sans-serif;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  overflow-x: hidden;
}

/* ===== Noise overlay ===== */
.noise-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px;
}

/* ===== Section labels ===== */
.section-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
}

.label-line {
  width: 40px;
  height: 1.5px;
  background: var(--ink);
  opacity: 0.2;
}

.label-text {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--ink-light);
  opacity: 0.5;
}

.section-heading {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  text-align: center;
  margin-bottom: 3rem;
  line-height: 1.3;
}

.section-heading em {
  font-style: normal;
  color: var(--clr-primary);
  position: relative;
}

.section-heading em::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: -4px;
  right: -4px;
  height: 8px;
  background: var(--clr-primary-light);
  opacity: 0.35;
  border-radius: 4px;
  transform: rotate(-1deg);
  z-index: -1;
}

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 2rem;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255,178,122,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(139,92,246,0.06) 0%, transparent 40%),
    var(--paper);
}

/* Decorative doodles */
.hero-deco { position: absolute; pointer-events: none; user-select: none; }
.hero-deco-star {
  top: 12%;
  left: 8%;
  font-size: 2rem;
  color: var(--clr-primary);
  opacity: 0.3;
  animation: twinkle 3s ease-in-out infinite;
}
.hero-deco-heart {
  top: 18%;
  right: 12%;
  font-size: 1.6rem;
  color: var(--clr-pink);
  opacity: 0.25;
  animation: twinkle 3s ease-in-out 1s infinite;
}
.hero-deco-dot1 {
  bottom: 25%;
  left: 15%;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--clr-green);
  opacity: 0.3;
}
.hero-deco-dot2 {
  top: 30%;
  right: 20%;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--clr-purple);
  opacity: 0.25;
}
@keyframes twinkle {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.15); }
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  max-width: 600px;
}

/* Mascot with "taped photo" frame */
.hero-mascot {
  position: relative;
  width: 200px;
  height: 200px;
}

.hero-mascot-frame {
  width: 100%;
  height: 100%;
  background: #fff;
  border: var(--border);
  border-radius: var(--radius);
  padding: 8px;
  box-shadow: var(--shadow);
  transform: rotate(-2deg);
  position: relative;
  overflow: hidden;
  transition: transform 0.4s var(--ease);
}

.hero-mascot-frame:hover {
  transform: rotate(1deg) scale(1.03);
}

/* Tape effect */
.hero-mascot-frame::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%) rotate(2deg);
  width: 60px;
  height: 18px;
  background: rgba(255,200,120,0.55);
  border: 1px solid rgba(42,42,42,0.1);
  border-radius: 2px;
  z-index: 2;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 12px 2px 10px 4px / 4px 10px 2px 12px;
}

.hero-mascot-shadow {
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 70%;
  height: 12px;
  background: radial-gradient(ellipse, rgba(42,42,42,0.12), transparent);
  border-radius: 50%;
}

.hero-text {
  text-align: center;
}

.hero-title {
  font-family: var(--font-display);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero-title-line {
  display: block;
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  color: var(--ink-light);
}

.hero-title-accent {
  display: block;
  font-size: clamp(2.8rem, 8vw, 4.2rem);
  color: var(--clr-primary);
  position: relative;
}

/* Hand-drawn circle around "AI 宠物" */
.hero-title-accent::before {
  content: '';
  position: absolute;
  inset: -8px -16px;
  border: 2.5px solid var(--clr-primary);
  border-radius: 58% 42% 55% 45% / 45% 55% 45% 55%;
  opacity: 0.2;
  animation: morph 8s ease-in-out infinite;
}

@keyframes morph {
  0%, 100% { border-radius: 58% 42% 55% 45% / 45% 55% 45% 55%; }
  25% { border-radius: 45% 55% 42% 58% / 55% 45% 55% 45%; }
  50% { border-radius: 52% 48% 60% 40% / 40% 60% 48% 52%; }
  75% { border-radius: 40% 60% 45% 55% / 52% 48% 42% 58%; }
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--ink-light);
  margin-bottom: 2rem;
  line-height: 2;
}

.hero-sub-em {
  position: relative;
}

.hero-sub-em::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--clr-primary-light);
  opacity: 0.3;
  border-radius: 3px;
  transform: rotate(-0.5deg);
}

.btn-hero {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 40px;
  background: var(--clr-primary);
  color: #fff;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.2rem;
  border: 2.5px solid var(--clr-primary-dark);
  border-radius: 20px 6px 18px 8px / 8px 18px 6px 20px;
  box-shadow: var(--shadow);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
  position: relative;
}

.btn-hero:hover {
  transform: translateY(-3px) rotate(-1deg);
  box-shadow: 5px 6px 0 var(--ink);
}

.btn-hero:active {
  transform: translateY(0) rotate(0);
  box-shadow: 2px 2px 0 var(--ink);
}

.btn-hero-arrow {
  font-size: 1.4rem;
  animation: bounce-down 2s ease-in-out infinite;
}

@keyframes bounce-down {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* Scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0.3;
}

.scroll-mouse {
  width: 22px;
  height: 34px;
  border: 2px solid var(--ink);
  border-radius: 11px;
  position: relative;
}

.scroll-dot {
  width: 3px;
  height: 8px;
  background: var(--ink);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll-hint 2s ease-in-out infinite;
}

@keyframes scroll-hint {
  0% { opacity: 1; top: 6px; }
  100% { opacity: 0; top: 18px; }
}

/* ============================================
   FEATURES
   ============================================ */
.features {
  padding: 5rem 1.5rem;
  max-width: 880px;
  margin: 0 auto;
}

.features-grid {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.feat {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.feat-right { flex-direction: row-reverse; }

.feat-img-wrap {
  flex-shrink: 0;
  width: 160px;
  height: 160px;
  background: #fff;
  border: var(--border);
  border-radius: var(--radius);
  padding: 6px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--ease);
}

.feat-img-wrap:hover {
  transform: scale(1.04) rotate(-1deg);
}

.feat-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 12px 2px 10px 4px / 4px 10px 2px 12px;
}

/* Tape effects on different corners */
.tape-tl::before, .tape-tr::before, .tape-bl::before, .tape-br::before {
  content: '';
  position: absolute;
  width: 48px;
  height: 16px;
  background: rgba(255,200,120,0.5);
  border: 1px solid rgba(42,42,42,0.08);
  border-radius: 2px;
  z-index: 2;
}
.tape-tl::before { top: -4px; left: 12px; transform: rotate(-8deg); }
.tape-tr::before { top: -4px; right: 12px; transform: rotate(6deg); }
.tape-bl::before { bottom: -4px; left: 12px; transform: rotate(5deg); }
.tape-br::before { bottom: -4px; right: 12px; transform: rotate(-7deg); }

.feat-text-icon {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--clr-primary);
  background: var(--paper-warm);
  border-radius: 12px 2px 10px 4px / 4px 10px 2px 12px;
}

.feat-content {
  flex: 1;
}

.feat-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--clr-primary);
  background: var(--paper-warm);
  border: 1.5px solid var(--clr-primary-light);
  border-radius: 8px 2px 6px 3px / 3px 6px 2px 8px;
  padding: 2px 10px;
  margin-bottom: 6px;
}

.feat-content h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: 6px;
}

.feat-content p {
  font-size: 0.95rem;
  color: var(--ink-light);
  line-height: 1.8;
}

.feat-content strong {
  color: var(--clr-primary-dark);
}

/* ============================================
   GAMEPLAY
   ============================================ */
.gameplay {
  padding: 5rem 1.5rem;
  background:
    linear-gradient(180deg, var(--paper) 0%, var(--paper-warm) 50%, var(--paper) 100%);
}

.gameplay .section-heading,
.gameplay .section-label {
  position: relative;
  z-index: 1;
}

.play-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 880px;
  margin: 0 auto;
}

.play-card {
  background: #fff;
  border: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  position: relative;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
  filter: url(#sketchy);
  display: flex;
  flex-direction: column;
}

.play-card:hover {
  transform: translateY(-4px) rotate(-0.5deg);
  box-shadow: var(--shadow);
}

.play-wide {
  grid-column: span 2;
  flex-direction: row;
}

.play-thumb {
  background: var(--paper-warm);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
}

.play-card:not(.play-wide) .play-thumb {
  height: 140px;
}

.play-wide .play-thumb {
  width: 200px;
  min-height: 160px;
}

.play-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s var(--ease);
}

.play-card:hover .play-thumb img {
  transform: scale(1.06);
}

.play-body {
  padding: 20px;
  flex: 1;
}

.play-body h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.play-body p {
  font-size: 0.88rem;
  color: var(--ink-light);
  line-height: 1.75;
}

.play-stars {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--clr-primary);
  letter-spacing: 1px;
  font-family: var(--font-display);
}

/* Stagger animations */
.play-card.anim-in:nth-child(2) { transition-delay: 0.05s; }
.play-card.anim-in:nth-child(3) { transition-delay: 0.1s; }
.play-card.anim-in:nth-child(4) { transition-delay: 0.15s; }
.play-card.anim-in:nth-child(5) { transition-delay: 0.2s; }
.play-card.anim-in:nth-child(6) { transition-delay: 0.25s; }

@media (max-width: 700px) {
  .play-grid {
    grid-template-columns: 1fr;
  }

  .play-wide {
    grid-column: span 1;
    flex-direction: column;
  }

  .play-wide .play-thumb {
    width: 100%;
    height: 140px;
    min-height: auto;
  }
}

@media (min-width: 701px) and (max-width: 900px) {
  .play-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .play-wide {
    grid-column: span 2;
  }
}

/* ============================================
   GROWTH
   ============================================ */
.growth {
  padding: 5rem 1.5rem;
  background:
    linear-gradient(180deg, var(--paper) 0%, var(--paper-alt) 50%, var(--paper) 100%);
  max-width: 100%;
}

.growth-path {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  max-width: 700px;
  margin: 0 auto 3rem;
  padding: 2rem 1rem;
}

.growth-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-width: 72px;
}

.node-circle {
  width: 24px;
  height: 24px;
  border: var(--border);
  border-radius: 50%;
  background: #fff;
  position: relative;
}

.node-filled {
  background: var(--clr-primary);
  border-color: var(--clr-primary-dark);
  box-shadow: 0 0 0 4px rgba(255,140,66,0.15);
}

.node-filled::after {
  content: '♥';
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--clr-primary);
  animation: twinkle 2s infinite;
}

.node-label {
  font-family: var(--font-display);
  font-size: 0.95rem;
}

.node-desc {
  font-size: 0.75rem;
  color: var(--ink-light);
  text-align: center;
  max-width: 80px;
}

.growth-node.active .node-label {
  color: var(--clr-primary);
}

.growth-connector {
  flex: 1;
  max-width: 80px;
  min-width: 30px;
  padding-top: 10px;
}

.growth-connector svg {
  width: 100%;
  height: 4px;
}

.growth-attrs {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  max-width: 540px;
  margin: 0 auto;
}

.attr {
  width: 150px;
  padding: 20px 16px;
  text-align: center;
  background: #fff;
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transform: rotate(var(--r, 0deg));
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  filter: url(#sketchy);
}

.attr:hover {
  transform: rotate(0deg) translateY(-4px);
  box-shadow: var(--shadow);
}

.attr-face {
  font-family: var(--font-display);
  font-size: 1.8rem;
  line-height: 1;
  margin-bottom: 8px;
  color: var(--clr-primary);
}

.attr strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  margin-bottom: 2px;
}

.attr span {
  font-size: 0.8rem;
  color: var(--ink-light);
}

/* ============================================
   TECH
   ============================================ */
.tech {
  padding: 5rem 1.5rem;
  max-width: 880px;
  margin: 0 auto;
}

.tech-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.tech-card {
  background: #fff;
  border: var(--border);
  border-radius: var(--radius-sm);
  padding: 24px 18px;
  position: relative;
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
  filter: url(#sketchy);
}

.tech-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.tc-num {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--clr-primary-light);
  opacity: 0.4;
  line-height: 1;
  margin-bottom: 12px;
}

.tech-card h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.tech-card p {
  font-size: 0.85rem;
  color: var(--ink-light);
  line-height: 1.7;
}

/* ============================================
   DOWNLOAD
   ============================================ */
.download {
  padding: 5rem 1.5rem;
  background: var(--paper-warm);
  position: relative;
}

/* Torn paper top edge */
.download::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 24px;
  background: var(--paper-warm);
  clip-path: polygon(
    0% 100%, 2% 60%, 5% 90%, 8% 50%, 12% 80%, 16% 45%, 20% 75%,
    24% 55%, 28% 85%, 32% 40%, 36% 70%, 40% 50%, 44% 80%, 48% 55%,
    52% 85%, 56% 45%, 60% 75%, 64% 50%, 68% 80%, 72% 40%, 76% 70%,
    80% 55%, 84% 85%, 88% 45%, 92% 75%, 96% 55%, 100% 100%
  );
}

.download-inner {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.download-title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  margin-bottom: 8px;
}

.download-sub {
  color: var(--ink-light);
  margin-bottom: 2rem;
}

.download-btns {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.dl-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 24px;
  background: #fff;
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: var(--ink);
  min-width: 200px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.dl-btn:hover {
  transform: translateY(-3px) rotate(-1deg);
  box-shadow: var(--shadow);
}

.dl-icon {
  font-family: var(--font-display);
  font-size: 1.4rem;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: var(--border);
  border-radius: var(--radius-sm);
  background: var(--paper);
  flex-shrink: 0;
}

.dl-info strong { display: block; font-size: 1rem; }
.dl-info small { font-size: 0.8rem; color: var(--ink-light); }

.dl-disabled {
  opacity: 0.35;
  pointer-events: none;
}

/* ============================================
   FAQ
   ============================================ */
.faq {
  padding: 4rem 1.5rem;
  max-width: 640px;
  margin: 0 auto;
}

.faq-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: #fff;
  border: var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  filter: url(#sketchy);
}

.faq-item summary {
  padding: 16px 20px;
  font-family: var(--font-display);
  font-size: 1rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color 0.2s;
}

.faq-item summary:hover { color: var(--clr-primary); }

.faq-item summary::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--clr-primary);
  transition: transform 0.3s var(--ease);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item p {
  padding: 0 20px 16px;
  font-size: 0.9rem;
  color: var(--ink-light);
  line-height: 1.8;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  padding: 3rem 1.5rem 2rem;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 28px;
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 0.95rem;
  position: relative;
  transition: color 0.2s;
}

.footer-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--clr-primary);
  transition: width 0.3s var(--ease);
}

.footer-links a:hover { color: var(--clr-primary); }
.footer-links a:hover::after { width: 100%; }

.footer-copy {
  font-size: 0.8rem;
  color: var(--ink-light);
  opacity: 0.6;
}

/* ============================================
   ANIMATIONS
   ============================================ */
.anim-in {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s var(--ease);
}

.anim-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.feat.anim-in:nth-child(2) { transition-delay: 0.1s; }
.feat.anim-in:nth-child(3) { transition-delay: 0.2s; }
.feat.anim-in:nth-child(4) { transition-delay: 0.3s; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 700px) {
  .feat {
    flex-direction: column !important;
    text-align: center;
  }

  .feat-img-wrap {
    width: 130px;
    height: 130px;
  }

  .tech-strip {
    grid-template-columns: 1fr 1fr;
  }

  .growth-path {
    flex-wrap: wrap;
    gap: 8px;
  }

  .growth-connector {
    display: none;
  }

  .growth-node {
    width: 45%;
  }

  .attr {
    width: 130px;
  }

  .hero-mascot {
    width: 160px;
    height: 160px;
  }

  .download-btns {
    flex-direction: column;
    align-items: center;
  }

  .dl-btn {
    width: 100%;
    max-width: 240px;
  }

  .hero-deco { display: none; }
}

@media (max-width: 480px) {
  .tech-strip {
    grid-template-columns: 1fr;
  }

  .growth-attrs {
    gap: 12px;
  }

  .attr {
    width: 110px;
    padding: 16px 12px;
  }
}