/* Panda Mandarin with Teacher Chen — site styles.
   Mobile first. Plain CSS, no build step. Tokens first, then base, layout, components. */

/* ---------- Design tokens ---------- */
:root {
  --color-orange: #FF9F2E;      /* Panda Orange: fills, buttons, accents */
  --color-orange-deep: #B85A00; /* orange used for text and links (contrast) */
  --color-cream: #FFF0C8;       /* Warm Cream */
  --color-green: #A6C96A;       /* Fresh Green: Panda Stories */
  --color-green-soft: #EAF2DC;
  --color-blue: #B9DFF3;        /* Soft Blue: Panda Songs */
  --color-blue-soft: #E6F3FA;
  --color-pink: #FCE4E4;        /* Blossom Pink: Chinese with Chen */
  --color-cocoa: #49352B;       /* Dark Cocoa: text */
  --color-cocoa-soft: #6E5A4F;  /* secondary text */
  --color-page: #FFFDF8;        /* page background */
  --color-line: #EADFCF;

  --font-sans: "Nunito", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-zh: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --step--1: clamp(0.875rem, 0.85rem + 0.1vw, 0.95rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --step-1: clamp(1.2rem, 1.1rem + 0.5vw, 1.45rem);
  --step-2: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --step-3: clamp(2.1rem, 1.6rem + 2.4vw, 3.6rem);

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-s: 0.75rem;
  --space-m: 1.25rem;
  --space-l: 2rem;
  --space-xl: 3.5rem;
  --space-2xl: 5.5rem;

  --radius-s: 0.5rem;
  --radius-m: 1rem;
  --radius-pill: 999px;
  --wrap: 72rem;
  --gutter: 1rem;
  --shadow-soft: 0 0.5rem 1.5rem rgb(73 53 43 / 0.08);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

@media (min-width: 48rem) {
  :root { --gutter: 2rem; }
}

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

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

body {
  margin: 0;
  background: var(--color-page);
  color: var(--color-cocoa);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { line-height: 1.15; margin: 0; font-weight: 800; letter-spacing: -0.01em; }
h1 { font-size: var(--step-3); }
h2 { font-size: var(--step-2); }
h3 { font-size: var(--step-1); }
p { margin: 0; }
img, svg { max-width: 100%; height: auto; display: block; }

:lang(zh-Hans) { font-family: var(--font-zh); letter-spacing: 0.02em; }
:lang(zh-Latn-pinyin) { font-family: var(--font-sans); }

a { color: var(--color-orange-deep); text-underline-offset: 0.18em; text-decoration-thickness: 0.08em; }
a:hover { color: var(--color-cocoa); }

:focus-visible {
  outline: 3px solid var(--color-cocoa);
  outline-offset: 3px;
  border-radius: 4px;
}

main:focus { outline: none; }

.skip-link {
  position: absolute;
  left: var(--space-s);
  top: -4rem;
  z-index: 100;
  padding: var(--space-xs) var(--space-m);
  background: var(--color-cocoa);
  color: #fff;
  border-radius: var(--radius-s);
}
.skip-link:focus { top: var(--space-s); color: #fff; }

/* ---------- Layout helpers ---------- */
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.stack-sm > * + * { margin-top: var(--space-s); }
.stack-lg > * + * { margin-top: var(--space-xl); }
.button-row { display: flex; flex-wrap: wrap; gap: var(--space-s); }

.eyebrow {
  font-size: var(--step--1);
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-orange-deep);
}

.highlight {
  background: linear-gradient(transparent 62%, var(--color-cream) 62%);
  padding-inline: 0.1em;
}

/* ---------- Buttons ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: 3rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  font: inherit;
  font-weight: 800;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out), background-color 0.2s;
}
.button:hover { transform: translateY(-2px); box-shadow: var(--shadow-soft); }
/* Cocoa text on orange: about 5.6:1, unlike white on orange. */
.button--primary { background: var(--color-orange); color: var(--color-cocoa); }
.button--primary:hover { background: #FFB04F; color: var(--color-cocoa); }
.button--secondary { background: transparent; border-color: var(--color-cocoa); color: var(--color-cocoa); }
.button--secondary:hover { background: var(--color-cream); color: var(--color-cocoa); }
.button--small { min-height: 2.5rem; padding: 0.45rem 1.05rem; font-size: var(--step--1); }

/* ---------- Header and navigation ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgb(255 253 248 / 0.94);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--color-line);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-s);
  min-height: 4.25rem;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-cocoa);
  text-decoration: none;
  margin-right: auto;
}
.brand-mark .panda { margin: 0; flex-shrink: 0; }
.brand-mark .panda img { width: 2.75rem; height: auto; }
.brand-mark__text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-mark__name { font-weight: 900; font-size: 1.15rem; letter-spacing: -0.01em; }
.brand-mark__sub { font-size: 0.8rem; color: var(--color-cocoa-soft); font-weight: 700; }

.site-nav__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  min-height: 2.75rem;
  padding: 0.4rem 0.8rem;
  border: 2px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: #fff;
  color: var(--color-cocoa);
  font: inherit;
  font-weight: 800;
  font-size: var(--step--1);
  cursor: pointer;
}
.site-nav__toggle-icon,
.site-nav__toggle-icon::before,
.site-nav__toggle-icon::after {
  display: block;
  width: 1rem;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  position: relative;
  transition: transform 0.2s var(--ease-out), opacity 0.2s;
}
.site-nav__toggle-icon::before,
.site-nav__toggle-icon::after { content: ""; position: absolute; left: 0; }
.site-nav__toggle-icon::before { top: -5px; }
.site-nav__toggle-icon::after { top: 5px; }
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-icon { background: transparent; }
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-icon::before { transform: translateY(5px) rotate(45deg); }
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-icon::after { transform: translateY(-5px) rotate(-45deg); }

.site-nav__list { list-style: none; margin: 0; padding: 0; }
.site-nav__list a:not(.button) {
  display: block;
  padding: var(--space-s) var(--space-2xs);
  color: var(--color-cocoa);
  font-weight: 800;
  text-decoration: none;
}
.site-nav__list a[aria-current="page"]:not(.button) { color: var(--color-orange-deep); }

/* Small screens: the list becomes a drop-down panel (only once JS is running). */
.no-js .site-nav__toggle { display: none; }
.no-js .site-header__inner { flex-wrap: wrap; }
.no-js .site-nav__list { display: flex; flex-wrap: wrap; gap: 0 var(--space-m); }
.js .site-nav__list {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  padding: var(--space-xs) var(--gutter) var(--space-m);
  background: var(--color-page);
  border-bottom: 1px solid var(--color-line);
  box-shadow: var(--shadow-soft);
}
.js .site-nav__list[hidden] { display: none; }
.js .site-nav__list li + li:not(.site-nav__cta-item) { border-top: 1px solid var(--color-line); }
/* Phones keep a compact, always-visible booking button next to the menu toggle. */
.site-nav__cta-item { display: none; }
.site-header__book { order: 2; padding-inline: 0.85rem; }
.site-nav { order: 3; }
.no-js .site-nav { order: 4; flex-basis: 100%; }
.visually-hidden-mobile {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}
.site-nav__toggle { width: 2.75rem; justify-content: center; padding: 0; }
@media (min-width: 30rem) {
  .visually-hidden-mobile { position: static; width: auto; height: auto; overflow: visible; clip: auto; clip-path: none; }
  .site-nav__toggle { width: auto; padding: 0.4rem 0.8rem; }
}
.brand-mark__name, .site-header__book { white-space: nowrap; }
.visually-hidden-narrow {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}
@media (min-width: 26rem) {
  .visually-hidden-narrow { position: static; width: auto; height: auto; overflow: visible; clip: auto; clip-path: none; }
}
@media (max-width: 22.5rem) {
  .brand-mark__name { font-size: 1rem; }
  .brand-mark .panda img { width: 2.25rem; }
}

@media (min-width: 62rem) {
  .site-nav__toggle { display: none; }
  .js .site-nav__list,
  .js .site-nav__list[hidden],
  .no-js .site-nav__list {
    position: static;
    display: flex;
    align-items: center;
    gap: var(--space-l);
    padding: 0;
    background: none;
    border: 0;
    box-shadow: none;
  }
  .js .site-nav__list li + li:not(.site-nav__cta-item) { border-top: 0; }
  .site-nav { order: 2; }
  .site-nav__cta-item { display: list-item; }
  .site-header__book { display: none; }
  .site-nav__list a:not(.button) { padding: var(--space-xs) 0; position: relative; }
  .site-nav__list a:not(.button)::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0.1rem;
    height: 3px;
    border-radius: 3px;
    background: var(--color-orange);
    transform: scaleX(0);
    transition: transform 0.25s var(--ease-out);
  }
  .site-nav__list a:hover::after,
  .site-nav__list a[aria-current="page"]::after { transform: scaleX(1); }
  .site-nav__list a[aria-current="page"]:not(.button) { color: var(--color-cocoa); }
}

/* ---------- Hero ---------- */
.hero { padding-block: var(--space-xl) var(--space-2xl); overflow: hidden; }
.hero__inner { display: grid; gap: var(--space-l); align-items: center; }
.hero__copy > * + * { margin-top: var(--space-m); }
.hero__title { font-size: var(--step-3); font-weight: 800; line-height: 1.1; max-width: 14ch; }
.hero__lead { font-size: var(--step-1); line-height: 1.5; color: var(--color-cocoa-soft); max-width: 34ch; }
.hero__note { font-weight: 800; color: var(--color-cocoa-soft); font-size: var(--step--1); }

.hero__art { display: flex; justify-content: center; }
.hero__stage {
  position: relative;
  width: min(100%, 24rem);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 55%, var(--color-cream) 0 62%, transparent 63%);
}
.hero__panda { margin: 0; width: 78%; }
.hero__panda img { width: 100%; }

.speech-bubble {
  position: absolute;
  top: 4%;
  right: -2%;
  display: grid;
  gap: 0.1rem;
  padding: var(--space-s) var(--space-m);
  background: #fff;
  border: 2px solid var(--color-cocoa);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-soft);
  text-align: center;
  transform: rotate(4deg);
}
.speech-bubble::after {
  content: "";
  position: absolute;
  left: 18%;
  bottom: -0.65rem;
  width: 1.1rem;
  height: 1.1rem;
  background: #fff;
  border-right: 2px solid var(--color-cocoa);
  border-bottom: 2px solid var(--color-cocoa);
  transform: rotate(45deg);
}
.speech-bubble__zh { font-size: var(--step-1); font-weight: 700; }
.speech-bubble__py { color: var(--color-orange-deep); font-weight: 800; }
.speech-bubble__en { font-size: var(--step--1); color: var(--color-cocoa-soft); }

@media (min-width: 48rem) {
  .hero { padding-block: var(--space-2xl); }
  .hero__inner { grid-template-columns: 1.1fr 0.9fr; gap: var(--space-xl); }
}

/* ---------- Panda ---------- */
.panda { position: relative; margin: 0; }
.panda__badge {
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  padding: 0.1rem 0.5rem;
  border-radius: var(--radius-pill);
  background: var(--color-cocoa);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  white-space: nowrap;
}
.brand-mark .panda__badge,
.site-footer .panda__badge { display: none; }

/* Gentle life: the hero panda bobs, and leans in on hover. */
@media (prefers-reduced-motion: no-preference) {
  .hero__panda { animation: panda-bob 4.5s ease-in-out infinite; }
  .hero__stage:hover .hero__panda { animation-play-state: paused; transform: rotate(-3deg) translateY(-4px); transition: transform 0.3s var(--ease-out); }
  .speech-bubble { animation: bubble-in 0.7s 0.3s var(--ease-out) both; }
}
@keyframes panda-bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
@keyframes bubble-in {
  from { opacity: 0; transform: rotate(4deg) translateY(8px) scale(0.92); }
  to { opacity: 1; transform: rotate(4deg); }
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--space-2xl);
  padding-block: var(--space-xl) var(--space-l);
  background: var(--color-cream);
}
.site-footer__inner { display: grid; gap: var(--space-l); }
.site-footer__brand { display: flex; gap: var(--space-s); align-items: center; }
.site-footer__brand .panda img { width: 3.25rem; }
.site-footer__name { font-weight: 900; }
.site-footer__slogan { color: var(--color-cocoa-soft); font-size: var(--step--1); }
.site-footer__zh { font-size: var(--step--1); }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: var(--space-xs) var(--space-m); }
.site-footer a { color: var(--color-cocoa); font-weight: 700; }
.site-footer__legal { margin-top: var(--space-l); font-size: var(--step--1); color: var(--color-cocoa-soft); }

@media (min-width: 48rem) {
  .site-footer__inner { grid-template-columns: 1.4fr 1fr auto; align-items: start; }
  .site-footer__nav ul { flex-direction: column; }
}

/* ---------- Simple message pages (404) ---------- */
.message-page { display: grid; justify-items: center; gap: var(--space-m); text-align: center; padding-block: var(--space-2xl); }

/* ---------- Development check page ---------- */
.swatches, .pose-grid { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-m); grid-template-columns: repeat(auto-fill, minmax(9rem, 1fr)); }
.swatches li { display: grid; gap: 0.2rem; font-size: var(--step--1); }
.swatch { display: block; height: 4rem; border-radius: var(--radius-s); border: 1px solid var(--color-line); }
.pose-grid li { display: grid; justify-items: center; gap: var(--space-xs); }
.pinyin-line { font-size: var(--step-2); font-weight: 700; }
.zh-lg { font-size: var(--step-1); }
.pinyin-table { border-collapse: collapse; width: 100%; max-width: 36rem; }
.pinyin-table th, .pinyin-table td { text-align: left; padding: var(--space-xs) var(--space-s); border-bottom: 1px solid var(--color-line); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}