/* Art direction: Chinese Tea Therapy — Traditional Chinese culture meets modern luxury
   Palette: Warm golden-brown (#A67C52 primary), cream/parchment (#F5F0E8 bg), deep brown (#3D2B1F text), rose-mauve (#B8907A secondary)
   Typography: Cormorant Garamond (EN display) + Noto Serif TC (ZH display) + Inter (EN body) + Noto Sans TC (ZH body)
   Density: Spacious — editorial luxury tea brand feel */

/* ===========================
   DESIGN TOKENS
   =========================== */

:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Font Families */
  --font-display-en: 'Cormorant Garamond', Georgia, serif;
  --font-display-zh: 'Noto Serif TC', 'Songti TC', serif;
  --font-display: var(--font-display-en);
  --font-body-en: 'Inter', 'Helvetica Neue', sans-serif;
  --font-body-zh: 'Noto Sans TC', 'PingFang TC', sans-serif;
  --font-body: var(--font-body-en);

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 350ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;
}

/* LIGHT MODE */
:root, [data-theme="light"] {
  --color-bg:             #F5F0E8;
  --color-surface:        #FAF7F2;
  --color-surface-2:      #FFFFFF;
  --color-surface-offset: #EDE8DE;
  --color-surface-offset-2: #E5DFD3;
  --color-surface-dynamic: #DDD7CA;
  --color-divider:        #D4CCBC;
  --color-border:         #C8BFA9;

  --color-text:           #3D2B1F;
  --color-text-muted:     #7A6B5D;
  --color-text-faint:     #B0A393;
  --color-text-inverse:   #FAF7F2;

  --color-primary:        #A67C52;
  --color-primary-hover:  #8D6843;
  --color-primary-active: #6F5235;
  --color-primary-highlight: #E8DDD0;

  --color-secondary:      #B8907A;
  --color-secondary-hover: #A07A64;

  --color-error:          #A13544;
  --color-success:        #5B7A3A;
  --color-warning:        #96621A;

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 60 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.02 60 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.02 60 / 0.12);
}

/* DARK MODE */
[data-theme="dark"] {
  --color-bg:             #1A1512;
  --color-surface:        #221C17;
  --color-surface-2:      #2A231D;
  --color-surface-offset: #1E1914;
  --color-surface-offset-2: #2F271F;
  --color-surface-dynamic: #3A3028;
  --color-divider:        #3D3228;
  --color-border:         #4D4035;

  --color-text:           #E8DDD0;
  --color-text-muted:     #A89888;
  --color-text-faint:     #6D5F52;
  --color-text-inverse:   #1A1512;

  --color-primary:        #C99B6E;
  --color-primary-hover:  #D4AA80;
  --color-primary-active: #B08556;
  --color-primary-highlight: #3A3028;

  --color-secondary:      #C9A08A;
  --color-secondary-hover: #D4B09C;

  --color-error:          #D46B7A;
  --color-success:        #7EA554;
  --color-warning:        #C9882E;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

/* ===========================
   BASE CSS
   =========================== */

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

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  hanging-punctuation: first last;
  scroll-padding-top: 5rem;
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body-zh);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

body.lang-en {
  font-family: var(--font-body-en);
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }

::selection {
  background: oklch(from var(--color-primary) l c h / 0.25);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }

a, button, [role="button"], [role="link"], input, textarea, select {
  transition: color var(--transition-interactive),
              background var(--transition-interactive),
              border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border-width: 0;
}

/* ===========================
   SHARED COMPONENTS
   =========================== */

.section-eyebrow {
  display: block;
  font-family: var(--font-body-en);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-display-zh);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.lang-en .section-title {
  font-family: var(--font-display-en);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-md);
  font-family: var(--font-body-zh);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-interactive);
  border: none;
}

.lang-en .btn {
  font-family: var(--font-body-en);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-primary:active { background: var(--color-primary-active); }

.btn-primary-light {
  background: rgba(255,255,255,0.15);
  color: #FAF7F2;
  border: 1px solid rgba(255,255,255,0.3);
  backdrop-filter: blur(8px);
}
.btn-primary-light:hover {
  background: rgba(255,255,255,0.25);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn-secondary:hover { background: var(--color-primary-highlight); }

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover { background: var(--color-surface-offset); }

.btn-full { width: 100%; }

/* ===========================
   NAVIGATION
   =========================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: color-mix(in oklch, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
}

.nav.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-6);
  gap: var(--space-4);
}

.nav__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo-img {
  height: 44px;
  width: auto;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-family: var(--font-body-zh);
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-text-muted);
  text-decoration: none;
  position: relative;
  padding: var(--space-1) 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: none;
  border: none;
}

.lang-en .nav__link { font-family: var(--font-body-en); }

.nav__link:hover { color: var(--color-text); }

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-primary);
  transition: width var(--transition-smooth);
}

.nav__link:hover::after { width: 100%; }

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.lang-toggle {
  font-family: var(--font-body-en);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  background: none;
  cursor: pointer;
}

.lang-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.nav__cart-icon {
  position: relative;
  color: var(--color-text-muted);
  padding: var(--space-1);
}

.nav__cart-icon:hover { color: var(--color-text); }

.cart-badge {
  position: absolute;
  top: -4px;
  right: -6px;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: 10px;
  font-weight: 700;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body-en);
}

.nav__cart-btn {
  display: none;
}

.nav__cart-btn .cart-badge {
  position: static;
  display: inline-flex;
  margin-left: var(--space-1);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  z-index: 110;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-text);
  transition: all var(--transition-interactive);
  transform-origin: center;
}

.nav__hamburger.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__hamburger.active span:nth-child(2) { opacity: 0; }
.nav__hamburger.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile nav */
@media (max-width: 768px) {
  .nav__inner {
    padding: var(--space-3) var(--space-4);
  }
  .nav__hamburger { display: flex; order: 3; }
  .nav__actions { order: 2; margin-left: auto; }
  .nav__links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-10);
    padding: var(--space-8);
    transform: translateX(100%);
    transition: transform var(--transition-smooth);
    z-index: 105;
  }
  .nav__links.open { transform: translateX(0); }
  .nav__link {
    font-size: var(--text-lg);
  }
  .nav__link::after { display: none; }
  .nav__cart-btn {
    display: inline-flex;
  }

}

/* ===========================
   HERO
   =========================== */

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
}

.hero__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(26, 21, 18, 0.3) 0%,
    rgba(26, 21, 18, 0.15) 50%,
    rgba(26, 21, 18, 0.5) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-8);
}

.hero__logo {
  width: min(280px, 50vw);
  height: auto;
  margin-bottom: var(--space-8);
  filter: brightness(1.3) saturate(0.8);
  animation: fadeInUp 1s ease-out 0.2s both;
}

.hero__tagline {
  font-family: var(--font-display-zh);
  font-size: var(--text-xl);
  color: #FAF7F2;
  margin-bottom: var(--space-10);
  letter-spacing: 0.08em;
  opacity: 0;
  animation: fadeInUp 1s ease-out 0.5s forwards;
}

.lang-en .hero__tagline {
  font-family: var(--font-display-en);
  font-size: var(--text-xl);
  font-style: italic;
  letter-spacing: 0.02em;
}

.hero__cta {
  opacity: 0;
  animation: fadeInUp 1s ease-out 0.8s forwards;
  padding: var(--space-4) var(--space-10);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===========================
   ABOUT
   =========================== */

.about {
  background: var(--color-bg);
  position: relative;
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
}

.about__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.about__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.about__definition {
  max-width: var(--content-narrow);
  margin: 0 auto var(--space-16);
}

.about__text {
  font-family: var(--font-body-zh);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-text-muted);
  text-align: center;
}

.lang-en .about__text {
  font-family: var(--font-body-en);
}

.about__subtitle {
  font-family: var(--font-display-zh);
  font-size: var(--text-xl);
  text-align: center;
  margin-bottom: var(--space-8);
}

.lang-en .about__subtitle {
  font-family: var(--font-display-en);
}

.indication-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-16);
}

.indication-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6);
  text-align: center;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.indication-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.indication-card__icon {
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  display: flex;
  justify-content: center;
}

.indication-card__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.about__science {
  max-width: var(--content-default);
  margin: 0 auto;
}

.science-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-8);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.science-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}

.science-card__title {
  font-family: var(--font-display-zh);
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

.lang-en .science-card__title {
  font-family: var(--font-display-en);
}

.science-card__text {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  max-width: 60ch;
  margin: 0 auto;
}

/* ===========================
   PROFESSOR
   =========================== */

.professor {
  background: var(--color-surface-offset);
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
}

.professor__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.professor__photo-wrap {
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 3/4;
  box-shadow: var(--shadow-lg);
}

.professor__photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: right center;
}

.professor__info-col {
  padding-top: var(--space-4);
}

.professor__credentials {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-10);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.professor__credentials li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-left: var(--space-5);
  position: relative;
  line-height: 1.6;
}

.professor__credentials li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

.professor__books-title {
  font-family: var(--font-display-zh);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-6);
}

.lang-en .professor__books-title {
  font-family: var(--font-display-en);
}

.professor__books-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-6);
  align-items: start;
}

.professor__book-cover {
  width: 120px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.professor__book-cover img {
  width: 100%;
  height: auto;
}

.professor__books-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.book-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
}

.book-item__year {
  font-family: var(--font-body-en);
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 600;
  min-width: 40px;
}

.book-item__title {
  font-size: var(--text-sm);
  color: var(--color-text);
}

@media (max-width: 768px) {
  .professor__inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  .professor__photo-wrap {
    aspect-ratio: 16/10;
    max-height: 360px;
  }
  .professor__books-grid {
    grid-template-columns: 100px 1fr;
  }
}

/* ===========================
   PRODUCTS
   =========================== */

.products {
  background: var(--color-bg);
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
}

.products__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.products__header {
  text-align: center;
  margin-bottom: var(--space-10);
}

/* Filter Tabs */
.filter-tabs {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: var(--space-10);
}

.filter-tab {
  font-family: var(--font-body-zh);
  font-size: var(--text-xs);
  font-weight: 500;
  padding: var(--space-2) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-interactive);
}

.lang-en .filter-tab {
  font-family: var(--font-body-en);
}

.filter-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-tab.active {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

@media (max-width: 640px) {
  .product-grid {
    grid-template-columns: 1fr;
  }
}

/* Product Card */
.product-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.product-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.product-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2);
}

.product-card__name-zh {
  font-family: var(--font-display-zh);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.2;
}

.product-card__name-en {
  font-family: var(--font-display-en);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: italic;
}

.product-card__type {
  display: inline-flex;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

.product-card__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.product-card__meta-row {
  display: flex;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.product-card__meta-label {
  color: var(--color-text-faint);
  min-width: 3.5em;
  flex-shrink: 0;
}

.product-card__effects {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 500;
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.product-card__indications {
  font-size: var(--text-sm);
  color: var(--color-secondary);
}

.product-card__purchase {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: auto;
  padding-top: var(--space-2);
}

.size-selector {
  display: flex;
  gap: var(--space-1);
}

.size-btn {
  font-family: var(--font-body-en);
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-interactive);
}

.size-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.size-btn.active {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.product-card__price {
  font-family: var(--font-body-en);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}

.product-card__add-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all var(--transition-interactive);
  white-space: nowrap;
}

.product-card__add-btn:hover {
  background: var(--color-primary-hover);
}

.product-card__add-btn:active {
  transform: scale(0.97);
}

.product-card__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

/* ===========================
   CART PANEL
   =========================== */

.cart-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-smooth);
}

.cart-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.cart-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(420px, 90vw);
  background: var(--color-surface);
  z-index: 210;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition-smooth);
  box-shadow: var(--shadow-lg);
}

.cart-panel.open {
  transform: translateX(0);
}

.cart-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-divider);
}

.cart-panel__header h2 {
  font-family: var(--font-display-zh);
  font-size: var(--text-lg);
  font-weight: 600;
}

.lang-en .cart-panel__header h2 {
  font-family: var(--font-display-en);
}

.cart-panel__close {
  color: var(--color-text-muted);
  padding: var(--space-1);
}
.cart-panel__close:hover { color: var(--color-text); }

.cart-panel__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
}

.cart-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: var(--space-4);
  color: var(--color-text-faint);
}

.cart-empty svg {
  opacity: 0.3;
}

.cart-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-divider);
  align-items: start;
}

.cart-item__name {
  font-weight: 600;
  font-size: var(--text-sm);
}

.cart-item__detail {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.cart-item__price {
  font-family: var(--font-body-en);
  font-size: var(--text-sm);
  font-weight: 600;
  text-align: right;
}

.cart-item__controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.cart-item__qty-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  cursor: pointer;
}

.cart-item__qty-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.cart-item__qty {
  font-family: var(--font-body-en);
  font-size: var(--text-sm);
  font-weight: 600;
  min-width: 24px;
  text-align: center;
}

.cart-item__remove {
  font-size: var(--text-xs);
  color: var(--color-error);
  cursor: pointer;
  margin-left: var(--space-2);
}

.cart-item__remove:hover {
  text-decoration: underline;
}

.cart-panel__footer {
  padding: var(--space-6);
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface-2);
}

.cart-panel__subtotal {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.cart-panel__shipping-line {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.cart-panel__shipping-line .free-shipping {
  color: var(--color-success);
  font-weight: 500;
}

.cart-panel__total-line {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-lg);
  font-weight: 600;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
  margin-bottom: var(--space-3);
}

.cart-panel__shipping {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.5;
}

/* ===========================
   CHECKOUT
   =========================== */

.checkout-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  overflow-y: auto;
}

.checkout-modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  width: min(900px, 95vw);
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.checkout-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6) var(--space-8);
  border-bottom: 1px solid var(--color-divider);
  position: sticky;
  top: 0;
  background: var(--color-surface);
  z-index: 1;
}

.checkout-modal__header h2 {
  font-family: var(--font-display-zh);
  font-size: var(--text-xl);
  font-weight: 600;
}

.lang-en .checkout-modal__header h2 {
  font-family: var(--font-display-en);
}

.checkout-modal__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  padding: var(--space-8);
}

@media (max-width: 768px) {
  .checkout-modal__body {
    grid-template-columns: 1fr;
  }
}

.checkout-form h3,
.checkout-summary h3 {
  font-family: var(--font-display-zh);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-6);
}

.lang-en .checkout-form h3,
.lang-en .checkout-summary h3 {
  font-family: var(--font-display-en);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-group--full {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
}

.form-group input {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  font-size: var(--text-sm);
}

.form-group input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
  border-color: var(--color-primary);
}

.checkout-summary__total {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-lg);
  font-weight: 600;
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-divider);
  margin-top: var(--space-4);
  margin-bottom: var(--space-6);
}

.checkout-summary__note {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-4);
  text-align: center;
}

/* ===========================
   SHIPPING METHOD SELECTOR
   =========================== */

.shipping-method {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.shipping-method__option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-interactive);
  background: var(--color-surface-2);
  position: relative;
}

.shipping-method__option:hover {
  border-color: var(--color-primary);
}

.shipping-method__option.active {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
  box-shadow: 0 0 0 1px var(--color-primary);
}

.shipping-method__radio {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-interactive);
}

.shipping-method__option.active .shipping-method__radio {
  border-color: var(--color-primary);
}

.shipping-method__option.active .shipping-method__radio::after {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
}

.shipping-method__label {
  flex: 1;
}

.shipping-method__label-main {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  display: block;
}

.shipping-method__label-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  display: block;
  margin-top: 2px;
}

.shipping-method__price {
  font-family: var(--font-body-en);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-success);
  flex-shrink: 0;
}

.shipping-method__note {
  font-size: var(--text-xs);
  color: var(--color-warning);
  background: color-mix(in oklch, var(--color-warning) 8%, transparent);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  line-height: 1.5;
}

/* ===========================
   DELIVERY DETAIL FIELDS
   =========================== */

.delivery-detail {
  margin-bottom: var(--space-4);
}

.delivery-detail .form-group {
  margin-bottom: var(--space-3);
}

.delivery-detail .form-group label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
  display: block;
}

.delivery-detail .form-group input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  font-size: var(--text-sm);
}

.delivery-detail .form-group input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
  border-color: var(--color-primary);
}

/* ===========================
   SHIPPING SUMMARY (Checkout)
   =========================== */

.shipping-summary {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

.shipping-summary__row {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
}

.shipping-summary__row .free-shipping {
  color: var(--color-success);
  font-weight: 500;
}

.shipping-summary__total {
  font-size: var(--text-lg) !important;
  font-weight: 600;
  color: var(--color-text) !important;
  border-top: 1px solid var(--color-divider);
  margin-top: var(--space-2);
  padding-top: var(--space-4) !important;
}

/* ===========================
   CHECKOUT MESSAGE
   =========================== */

.checkout-message {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: 1.5;
  text-align: center;
}

.checkout-message--success {
  background: color-mix(in oklch, var(--color-success) 10%, transparent);
  color: var(--color-success);
  border: 1px solid color-mix(in oklch, var(--color-success) 25%, transparent);
}

.checkout-message--info {
  background: color-mix(in oklch, var(--color-primary) 10%, transparent);
  color: var(--color-primary);
  border: 1px solid color-mix(in oklch, var(--color-primary) 25%, transparent);
}

.checkout-message--error {
  background: color-mix(in oklch, var(--color-error) 10%, transparent);
  color: var(--color-error);
  border: 1px solid color-mix(in oklch, var(--color-error) 25%, transparent);
}

/* Stripe button icon alignment */
#stripeBtn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

#stripeBtn svg {
  display: inline-block;
  flex-shrink: 0;
}

.checkout-item {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-sm);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-divider);
}

.checkout-item__name {
  color: var(--color-text);
}

.checkout-item__price {
  font-family: var(--font-body-en);
  font-weight: 600;
}

/* ===========================
   FOOTER
   =========================== */

.footer {
  background: var(--color-surface-offset);
  border-top: 1px solid var(--color-divider);
  padding: var(--space-12) 0 var(--space-8);
}

.footer__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-6);
}

.footer__logo {
  height: 60px;
  width: auto;
  opacity: 0.6;
}

.footer__company {
  font-family: var(--font-body-en);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

.footer__email a {
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
}

.footer__email a:hover {
  text-decoration: underline;
}

.footer__disclaimer {
  max-width: 500px;
}

.footer__disclaimer p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.6;
}

.footer__attribution {
  margin-top: var(--space-4);
}

.footer__attribution a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}

.footer__attribution a:hover {
  color: var(--color-text-muted);
}

/* ===========================
   SCROLL ANIMATIONS
   =========================== */

.reveal {
  opacity: 0;
  transition: opacity 0.7s ease-out;
}

.reveal.visible {
  opacity: 1;
}

/* ===========================
   UTILITY
   =========================== */

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
  .form-group--full {
    grid-column: auto;
  }
}

/* ===========================
   SF EXPRESS SEARCHABLE DROPDOWN
   =========================== */

.sf-dropdown {
  position: relative;
  margin-bottom: var(--space-3);
}

.sf-dropdown label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
  display: block;
}

.sf-dropdown__input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.sf-dropdown__input-wrap input[type="text"] {
  width: 100%;
  padding: var(--space-3) var(--space-10) var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  font-size: var(--text-sm);
  color: var(--color-text);
  font-family: var(--font-body-zh);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
  cursor: text;
}

.sf-dropdown__input-wrap input[type="text"]:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--color-primary) 15%, transparent);
}

.sf-dropdown__input-wrap input[aria-expanded="true"] {
  border-color: var(--color-primary);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.sf-dropdown__clear {
  position: absolute;
  right: var(--space-3);
  background: none;
  border: none;
  padding: var(--space-1) var(--space-2);
  color: var(--color-text-faint);
  cursor: pointer;
  font-size: var(--text-sm);
  line-height: 1;
  transition: color var(--transition-interactive);
  border-radius: var(--radius-sm);
}

.sf-dropdown__clear:hover {
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
}

.sf-dropdown__listbox {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 9999;
  background: var(--color-surface-2);
  border: 1px solid var(--color-primary);
  border-top: none;
  border-bottom-left-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
  max-height: 252px;
  overflow-y: auto;
  box-shadow: 0 8px 24px color-mix(in oklch, var(--color-text) 10%, transparent);
  animation: sfDropdownIn 140ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes sfDropdownIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scrollbar styling for dropdown */
.sf-dropdown__listbox::-webkit-scrollbar {
  width: 6px;
}
.sf-dropdown__listbox::-webkit-scrollbar-track {
  background: transparent;
}
.sf-dropdown__listbox::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}
.sf-dropdown__listbox::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-faint);
}

.sf-dropdown__group-header {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  background: color-mix(in oklch, var(--color-primary) 6%, var(--color-surface-2));
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--color-divider);
  position: sticky;
  top: 0;
  z-index: 1;
}

.sf-dropdown__option {
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  border-bottom: 1px solid var(--color-surface-offset);
  transition: background var(--transition-interactive);
}

.sf-dropdown__option:last-child {
  border-bottom: none;
}

.sf-dropdown__option:hover,
.sf-dropdown__option.highlighted {
  background: color-mix(in oklch, var(--color-primary) 8%, var(--color-surface-2));
}

.sf-dropdown__option.selected {
  background: color-mix(in oklch, var(--color-primary) 12%, var(--color-surface-2));
}

.sf-dropdown__option-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
  font-family: var(--font-body-zh);
}

.sf-dropdown__option-addr {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
  font-family: var(--font-body-zh);
}

.sf-dropdown__option-code {
  display: inline-block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-family: var(--font-body-en);
  font-weight: 500;
  background: var(--color-surface-offset);
  padding: 1px var(--space-2);
  border-radius: var(--radius-sm);
}

.sf-dropdown__empty {
  padding: var(--space-5) var(--space-4);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-style: italic;
}

/* Ensure delivery detail container doesn't clip dropdown */
.delivery-detail {
  overflow: visible !important;
}

/* Mobile adjustments */
@media (max-width: 480px) {
  .sf-dropdown__listbox {
    max-height: 200px;
  }
  .sf-dropdown__option {
    padding: var(--space-3);
  }
}