/* ===== Design Tokens ===== */
:root {
  /* Warm palette — inspired by Buttermax */
  --primary: #1C1C1C;
  --primary-soft: #2D2D2D;
  --accent: #C8963E;
  --accent-light: #D4A94E;
  --accent-subtle: rgba(200, 150, 62, 0.1);
  --tpatrol: #E8940A;
  --tpatrol-dark: #C67D08;
  --tpatrol-subtle: rgba(232, 148, 10, 0.08);
  --tvouch: #0EA472;
  --tvouch-dark: #0B8A60;
  --tvouch-subtle: rgba(14, 164, 114, 0.08);

  --bg: #FAFAF7;
  --bg-warm: #F5F3EE;
  --bg-white: #FFFFFF;
  --text: #1C1C1C;
  --text-secondary: #4A4A4A;
  --text-muted: #6B6660;
  --border: #E8E5DE;
  --border-light: #F0EDE6;

  /* Spacing */
  --max-w: 1200px;
  --section-py: 6rem;

  /* Typography */
  --font: 'IBM Plex Sans', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Fraunces', 'Noto Serif TC', Georgia, serif;

  /* Motion */
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-secondary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }
img { max-width: 100%; height: auto; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 0.25rem;
}

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

/* ===== Layout ===== */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (min-width: 1024px) {
  .container { padding: 0 2.5rem; }
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
  color: var(--text);
  line-height: 1.2;
  font-weight: 700;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  font-size: 0.9375rem;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn-full { width: 100%; }

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-soft);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--text);
}

.btn-product {
  width: 100%;
  padding: 0.875rem 1.25rem;
  border-radius: 0.5rem;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.01em;
}

.btn-product-tpatrol {
  background: var(--tpatrol);
}
.btn-product-tpatrol:hover {
  background: var(--tpatrol-dark);
  transform: translateY(-1px);
}

.btn-product-tvouch {
  background: var(--tvouch);
}
.btn-product-tvouch:hover {
  background: var(--tvouch-dark);
  transform: translateY(-1px);
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 4rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.logo-icon {
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  border-radius: 0.5rem;
  color: #fff;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.logo-main {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

.logo-sub {
  font-size: 0.6875rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 2.5rem;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.nav-actions {
  display: none;
  align-items: center;
  gap: 1rem;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  min-height: 2.75rem;
  padding: 0.5rem 0.75rem;
  color: var(--text-muted);
  font-size: 0.8125rem;
  border-radius: 0.375rem;
  transition: color 0.2s, background-color 0.2s;
}
.lang-toggle:hover {
  color: var(--text);
  background: var(--border-light);
}

.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  color: var(--text-secondary);
  border-radius: 0.375rem;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border-light);
}
.mobile-menu.active { display: flex; }
.mobile-menu a {
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}
.mobile-menu-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-light);
}

@media (min-width: 768px) {
  .nav-links { display: flex; }
  .nav-actions { display: flex; }
  .mobile-menu-btn { display: none; }
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 8rem 1.5rem 5rem;
  overflow: hidden;
  background: var(--bg);
}

.hero-content {
  position: relative;
  max-width: 52rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 2rem;
}

.hero-title { margin-bottom: 1.5rem; }

.hero-title-main {
  display: block;
  font-family: var(--font-serif);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.hero-title-sub {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 400;
  font-style: italic;
  color: var(--accent);
  margin-top: 0.5rem;
  letter-spacing: 0.01em;
  font-variation-settings: "opsz" 14;
}

.hero-tagline {
  font-size: 1.375rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 1rem;
}

.hero-description {
  max-width: 38rem;
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 4rem;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.stat {
  min-width: 0;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

@media (min-width: 640px) {
  .hero-cta {
    flex-direction: row;
  }
}

@media (min-width: 768px) {
  .hero {
    padding: 10rem 2.5rem 7rem;
  }
  .hero-title-main { font-size: 5rem; }
  .hero-title-sub { font-size: 1.75rem; }
  .hero-tagline { font-size: 1.625rem; }
  .hero-stats { gap: 4.5rem; }
  .stat-value { font-size: 1.75rem; }
}

/* ===== Section Common ===== */
.section-header {
  margin-bottom: 3.5rem;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-badge-blue { color: var(--accent); }
.section-badge-accent { color: var(--accent); }

.section-title {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.625rem;
  letter-spacing: -0.005em;
  line-height: 1.15;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-secondary);
}

@media (min-width: 768px) {
  .section-title { font-size: 3.25rem; }
}

/* ===== Products ===== */
.products {
  padding: var(--section-py) 0;
  background: var(--bg-white);
}

.products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: 56rem;
  margin: 0 auto;
}

.product-card {
  padding: 2.25rem;
  background: var(--bg-white);
  border: 1.5px solid var(--border);
  border-radius: 1rem;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}

.product-card:hover {
  border-color: var(--border);
  box-shadow: 0 16px 48px -12px rgba(0, 0, 0, 0.08);
  transform: translateY(-3px);
}

.product-card-tpatrol { border-color: var(--border); }
.product-card-tvouch { border-color: var(--border); }

.product-card-tpatrol:hover { border-color: rgba(232, 148, 10, 0.3); }
.product-card-tvouch:hover { border-color: rgba(14, 164, 114, 0.3); }

.product-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.75rem;
}

.product-num {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 2.5rem;
  font-weight: 500;
  line-height: 1;
  font-variation-settings: "opsz" 144;
}

.product-card-tpatrol .product-num { color: var(--tpatrol); }
.product-card-tvouch .product-num { color: var(--tvouch); }

.product-badge {
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.product-badge-tpatrol {
  background: var(--tpatrol-subtle);
  color: var(--tpatrol-dark);
}

.product-badge-tvouch {
  background: var(--tvouch-subtle);
  color: var(--tvouch-dark);
}

.product-name {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
  letter-spacing: -0.005em;
}

.product-tagline {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

.product-features { margin-bottom: 1.75rem; }

.product-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  margin-bottom: 0.625rem;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.product-features li svg {
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.product-card-tpatrol .product-features li svg { color: var(--tpatrol); }
.product-card-tvouch .product-features li svg { color: var(--tvouch); }

@media (min-width: 768px) {
  .products { padding: var(--section-py) 0; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== About ===== */
.about {
  padding: var(--section-py) 0;
  background: var(--bg-warm);
}

.about-manifesto {
  max-width: 62rem;
  margin: 0 auto;
}

.about-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
}

.about-row:last-child {
  border-bottom: 1px solid var(--border);
}

.about-label {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.about-num {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.25rem;
  color: var(--accent);
  font-weight: 500;
  font-variation-settings: "opsz" 14;
}

.about-key {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.01em;
}

.about-statement {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 48rem;
}

@media (min-width: 768px) {
  .about-row {
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    padding: 3rem 0;
  }
  .about-key { font-size: 1.75rem; }
  .about-statement { font-size: 1.1875rem; }
}

/* ===== Contact ===== */
.contact {
  padding: var(--section-py) 0;
  background: var(--bg-white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  max-width: 56rem;
  margin: 0 auto;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem;
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: 0.625rem;
}

.contact-item-icon {
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  border-radius: 0.5rem;
  color: var(--accent);
  flex-shrink: 0;
}

.contact-item-icon svg { width: 16px; height: 16px; }

.contact-item h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.125rem;
}

.contact-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.contact-item p a {
  color: inherit;
  transition: color 0.2s;
}

.contact-item p a:hover {
  color: var(--accent);
}

.contact-form-wrapper {
  padding: 2rem;
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: 0.75rem;
}

.form-group { margin-bottom: 1.25rem; }

.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.375rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  font-family: var(--font);
  font-size: 0.9375rem;
  color: var(--text);
  background: var(--bg-white);
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}

.form-group textarea {
  resize: vertical;
  min-height: 6rem;
}

@media (min-width: 768px) {
  .contact-grid { grid-template-columns: 1fr 1.2fr; }
}

/* ===== Footer ===== */
.footer {
  padding: 3.5rem 0 2rem;
  background: var(--primary);
  color: rgba(255, 255, 255, 0.6);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer .logo-icon {
  background: rgba(255, 255, 255, 0.12);
}

.footer .logo-main { color: #fff; }
.footer .logo-sub { color: rgba(255, 255, 255, 0.5); }

.footer-brand p {
  font-size: 0.875rem;
  margin-top: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
}

.footer-products h4,
.footer-contact h4,
.footer-lang h4 {
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.875rem;
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.footer-products ul li { margin-bottom: 0.375rem; }

.footer-products a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.55);
  transition: color 0.2s;
}
.footer-products a:hover { color: #fff; }

.footer-contact p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 0.375rem;
}

.footer .lang-toggle { color: rgba(255, 255, 255, 0.55); }
.footer .lang-toggle:hover { color: #fff; }

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
}

@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}

/* ===== Nav scroll state ===== */
.nav.scrolled {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
}