/* ============================================
   Bubble Food 百寶食品 — Design System
   Monochromatic + Warm Amber Accent
   ============================================ */

:root,
[data-theme='light'] {
  /* 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;

  /* Colors — Monochrome + Amber */
  --color-bg: #fafaf9;
  --color-surface: #f5f5f4;
  --color-surface-2: #efeeec;
  --color-surface-offset: #e8e7e4;
  --color-divider: #e0dedb;
  --color-border: #d4d2ce;

  --color-text: #1a1a1a;
  --color-text-muted: #6b6b68;
  --color-text-faint: #a8a8a4;
  --color-text-inverse: #fafaf9;

  --color-primary: #c8862d;
  --color-primary-hover: #a8701f;
  --color-primary-active: #8a5a14;
  --color-primary-highlight: #f5e9d6;

  /* Diagonal accent color */
  --color-diagonal: #555555;

  /* Radius */
  --radius-sm: 0.375rem;
  --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);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(20, 20, 20, 0.04);
  --shadow-md: 0 4px 12px rgba(20, 20, 20, 0.06);
  --shadow-lg: 0 12px 32px rgba(20, 20, 20, 0.10);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1140px;
  --content-full: 100%;

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Helvetica Neue', sans-serif;
}

[data-theme='dark'] {
  --color-bg: #131312;
  --color-surface: #1a1a18;
  --color-surface-2: #20201e;
  --color-surface-offset: #242422;
  --color-divider: #2a2a28;
  --color-border: #363634;

  --color-text: #e8e7e4;
  --color-text-muted: #9a9996;
  --color-text-faint: #6a6a67;
  --color-text-inverse: #1a1a18;

  --color-primary: #e8a842;
  --color-primary-hover: #f0b855;
  --color-primary-active: #d49230;
  --color-primary-highlight: #3d3425;

  --color-diagonal: #777774;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
}

/* ============================================
   Base
   ============================================ */

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
}

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

img,
picture,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

button {
  cursor: pointer;
  background: none;
  border: none;
  font: inherit;
  color: inherit;
}

h1, h2, h3 {
  text-wrap: balance;
  line-height: 1.15;
}

p, li {
  text-wrap: pretty;
  max-width: 72ch;
}

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

::selection {
  background: rgba(200, 134, 45, 0.2);
  color: var(--color-text);
}

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

/* ============================================
   Layout
   ============================================ */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin: 0 auto;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
}

.section {
  padding-block: clamp(var(--space-12), 6vw, var(--space-24));
}

.section__label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  color: var(--color-text);
}

/* ============================================
   Header
   ============================================ */

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.header--hidden {
  transform: translateY(-100%);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.header__logo {
  display: flex;
  align-items: center;
}

.header__logo-img {
  height: 2.5rem;
  width: auto;
  border-radius: var(--radius-sm);
}

.header__nav {
  display: flex;
  gap: var(--space-8);
}

.header__nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-interactive);
  position: relative;
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-interactive);
}

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

.header__nav-link:hover::after {
  width: 100%;
}

.header__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}

.header__toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

/* ============================================
   Hero
   ============================================ */

.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg) 50%, var(--color-surface-offset) 100%);
  z-index: 0;
}

.hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url('assets/images/hero-food.png');
  background-size: cover;
  background-position: center right;
  opacity: 0.15;
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
  padding-block: var(--space-32);
  max-width: var(--content-wide);
}

.hero__label {
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
  padding-left: var(--space-4);
  border-left: 3px solid var(--color-primary);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: var(--space-6);
  max-width: 16ch;
}

.hero__title-zh {
  display: block;
}

.hero__title-en {
  display: block;
  font-size: 0.45em;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
  letter-spacing: 0;
}

.hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: var(--space-10);
  line-height: 1.7;
}

.hero__subtitle-en {
  font-size: 0.92em;
  color: var(--color-text-faint);
}

.hero__cta {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Diagonal motif echoing the logo */
.hero__diagonal {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 60%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-diagonal), transparent);
  transform: rotate(-12deg) translateY(-3rem);
  transform-origin: right;
  opacity: 0.3;
  z-index: 0;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  transition: all var(--transition-interactive);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--primary:active {
  background: var(--color-primary-active);
  transform: translateY(0);
}

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

.btn--ghost:hover {
  border-color: var(--color-text);
  background: var(--color-surface);
}

/* ============================================
   About Section
   ============================================ */

.about__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(var(--space-8), 5vw, var(--space-16));
  align-items: center;
}

.about__desc {
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-4);
  line-height: 1.75;
}

.about__desc-en {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

.about__features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.about__features li {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.about__feature-icon {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
}

.about__features strong {
  display: block;
  font-size: var(--text-sm);
  font-weight: 700;
  margin-bottom: var(--space-1);
  color: var(--color-text);
}

.about__features p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: none;
}

.about__image-wrap {
  position: relative;
}

.about__image {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.about__image-wrap::before {
  content: '';
  position: absolute;
  top: -1rem;
  right: -1rem;
  width: 100%;
  height: 100%;
  border: 2px solid var(--color-diagonal);
  border-radius: var(--radius-lg);
  opacity: 0.2;
  z-index: -1;
}

/* ============================================
   Products Section
   ============================================ */

.section--products {
  background: var(--color-surface);
}

.products__header {
  text-align: center;
  margin-bottom: clamp(var(--space-10), 4vw, var(--space-16));
}

.products__header .section__label {
  text-align: center;
}

.products__intro {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 40ch;
  margin: 0 auto;
}

.products__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  margin-bottom: clamp(var(--space-10), 4vw, var(--space-16));
}

.product-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive);
}

.product-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.product-card__icon {
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-md);
}

.product-card__icon svg {
  width: 2rem;
  height: 2rem;
}

.product-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.product-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: none;
}

.products__banner {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

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

/* ============================================
   Contact Section
   ============================================ */

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-8), 5vw, var(--space-16));
  align-items: center;
}

.contact__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.contact__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact__list li {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}

.contact__list-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-faint);
  min-width: 4rem;
  flex-shrink: 0;
}

.contact__list-value {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
}

.contact__list-link {
  transition: color var(--transition-interactive);
}

.contact__list-link:hover {
  color: var(--color-primary);
}

.contact__cta-card {
  position: relative;
  background: var(--color-text);
  color: var(--color-text-inverse);
  padding: clamp(var(--space-8), 4vw, var(--space-12));
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.contact__cta-diagonal {
  position: absolute;
  top: 50%;
  left: -10%;
  width: 120%;
  height: 1px;
  background: var(--color-primary);
  opacity: 0.4;
  transform: rotate(-12deg);
}

.contact__cta-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-3);
  position: relative;
}

.contact__cta-text {
  font-size: var(--text-sm);
  color: var(--color-text-inverse);
  opacity: 0.7;
  margin-bottom: var(--space-6);
  position: relative;
  max-width: none;
}

.contact__cta-buttons {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  position: relative;
}

.contact__cta-card .btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.contact__cta-card .btn--ghost {
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-text-inverse);
}

.contact__cta-card .btn--ghost:hover {
  border-color: var(--color-text-inverse);
  background: rgba(255, 255, 255, 0.1);
}

/* ============================================
   Footer
   ============================================ */

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

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}

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

.footer__logo {
  height: 2.5rem;
  border-radius: var(--radius-sm);
}

.footer__company {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.footer__copyright {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ============================================
   Responsive
   ============================================ */

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

  .about__grid,
  .contact__grid {
    grid-template-columns: 1fr;
  }

  .about__image-wrap {
    order: -1;
    max-width: 480px;
  }
}

@media (max-width: 640px) {
  .header__nav {
    display: none;
  }

  .products__grid {
    grid-template-columns: 1fr;
  }

  .hero__cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

  .hero__diagonal {
    display: none;
  }

  .about__image-wrap::before {
    display: none;
  }
}

/* ============================================
   Scroll Reveal Animation
   ============================================ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}