/* ========================================
   Design Tokens & Variables
   ======================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+TC:wght@400;500;700&display=swap');

:root {
  /* Colors */
  --color-primary: #C0392B;
  --color-primary-light: #E74C3C;
  --color-primary-dark: #962D22;
  --color-accent: #2ECC71;
  --color-accent-dark: #27AE60;

  --color-neutral-900: #1A1A2E;
  --color-neutral-800: #2D2D44;
  --color-neutral-700: #4A4A5A;
  --color-neutral-400: #9E9EB0;
  --color-neutral-200: #E0E0EA;
  --color-neutral-100: #F4F4F8;
  --color-neutral-50: #FAFAFE;
  --color-white: #FFFFFF;

  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-chinese: 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;

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

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
}

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

body, h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote {
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-main);
  color: var(--color-neutral-900);
  background: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html[data-lang="zh-Hant"] body {
  font-family: var(--font-chinese);
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* Language Toggle CSS */
html[data-lang="en"] [lang="zh-Hant"] { display: none; }
html[data-lang="zh-Hant"] [lang="en"] { display: none; }

/* ========================================
   Layout Utilities
   ======================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-16) 0;
}

.section--lg {
  padding: var(--space-20) 0;
}

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

.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr 1fr; }

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

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

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

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--color-neutral-900);
}

.section-header p {
  font-size: 1.125rem;
  color: var(--color-neutral-700);
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Skip Link (Accessibility)
   ======================================== */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-4);
}

/* ========================================
   Header / Navigation
   ======================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-4) 0;
  transition: background var(--transition-base), box-shadow var(--transition-base), padding var(--transition-base);
}

.site-header.header-scrolled {
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  padding: var(--space-2) 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-white);
  z-index: 101;
  transition: color var(--transition-base);
}

.header-scrolled .logo {
  color: var(--color-neutral-900);
}

.logo-icon {
  width: 36px;
  height: 36px;
}

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

.nav-links {
  display: none;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  font-weight: 500;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-white);
}

.header-scrolled .nav-links a {
  color: var(--color-neutral-700);
}

.header-scrolled .nav-links a:hover,
.header-scrolled .nav-links a.active {
  color: var(--color-primary);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

/* Language Toggle */
.lang-switch {
  padding: var(--space-1) var(--space-3);
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-white);
  transition: all var(--transition-fast);
  z-index: 101;
}

.lang-switch:hover {
  background: rgba(255, 255, 255, 0.15);
}

.header-scrolled .lang-switch {
  color: var(--color-neutral-700);
  border-color: var(--color-neutral-200);
}

.header-scrolled .lang-switch:hover {
  background: var(--color-neutral-100);
  color: var(--color-primary);
}

/* Hamburger */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  z-index: 101;
}

@media (min-width: 768px) {
  .nav-toggle { display: none; }
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 1px;
  transition: all var(--transition-base);
}

.header-scrolled .nav-toggle span {
  background: var(--color-neutral-900);
}

.nav-open .nav-toggle span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-open .nav-toggle span:nth-child(2) {
  opacity: 0;
}
.nav-open .nav-toggle span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav Overlay */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-neutral-900);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
}

.nav-open .mobile-nav {
  display: flex;
}

.mobile-nav a {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-white);
  transition: color var(--transition-fast);
}

.mobile-nav a:hover {
  color: var(--color-primary-light);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-base);
}

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

.btn-primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(192, 57, 43, 0.4);
}

.btn-outline {
  border: 2px solid var(--color-white);
  color: var(--color-white);
}

.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-neutral-900);
}

.btn-outline-dark {
  border: 2px solid var(--color-neutral-900);
  color: var(--color-neutral-900);
}

.btn-outline-dark:hover {
  background: var(--color-neutral-900);
  color: var(--color-white);
}

.btn-lg {
  padding: var(--space-4) var(--space-10);
  font-size: 1.0625rem;
}

/* ========================================
   Cards
   ======================================== */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-neutral-200);
  transition: all var(--transition-base);
}

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

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  font-size: 1.5rem;
}

.card-icon--primary {
  background: rgba(192, 57, 43, 0.1);
  color: var(--color-primary);
}

.card-icon--accent {
  background: rgba(46, 204, 113, 0.1);
  color: var(--color-accent-dark);
}

.card-icon--blue {
  background: rgba(52, 152, 219, 0.1);
  color: #2980B9;
}

.card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.card p {
  color: var(--color-neutral-700);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* App Card */
.app-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-neutral-200);
  transition: all var(--transition-base);
}

.app-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.app-card-image {
  height: 200px;
  background: linear-gradient(135deg, var(--color-neutral-800), var(--color-neutral-900));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.app-card-body {
  padding: var(--space-6);
}

.app-card-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: rgba(192, 57, 43, 0.08);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.app-card-body h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.app-card-body p {
  color: var(--color-neutral-700);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Value Card */
.value-card {
  text-align: center;
  padding: var(--space-8) var(--space-6);
}

.value-card .card-icon {
  margin: 0 auto var(--space-6);
}

/* ========================================
   Hero Sections
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #1A1A2E 0%, #16213E 50%, #0F3460 100%);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(192, 57, 43, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(46, 204, 113, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.15;
  margin-bottom: var(--space-6);
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: var(--space-8);
  line-height: 1.7;
  max-width: 550px;
}

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

/* Maple leaf decorative element */
.hero-decoration {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  width: 500px;
  height: 500px;
  opacity: 0.06;
  pointer-events: none;
}

@media (max-width: 768px) {
  .hero-decoration { display: none; }
}

.scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8125rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* Page Hero (shorter for inner pages) */
.hero--short {
  min-height: 40vh;
  padding-top: 100px;
}

.hero--short h1 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.breadcrumb {
  display: flex;
  gap: var(--space-2);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
  margin-bottom: var(--space-4);
}

.breadcrumb a:hover {
  color: var(--color-white);
}

.breadcrumb span {
  color: rgba(255, 255, 255, 0.4);
}

/* ========================================
   Stats Bar
   ======================================== */
.stats-bar {
  background: var(--color-neutral-50);
  border-top: 1px solid var(--color-neutral-200);
  border-bottom: 1px solid var(--color-neutral-200);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
  text-align: center;
  padding: var(--space-12) 0;
}

@media (min-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-item h3 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat-item p {
  color: var(--color-neutral-700);
  font-size: 0.9375rem;
  font-weight: 500;
}

/* ========================================
   CTA Banner
   ======================================== */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary), var(--color-primary-light));
  color: var(--color-white);
  text-align: center;
  padding: var(--space-16) 0;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.cta-banner h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  margin-bottom: var(--space-4);
  position: relative;
}

.cta-banner p {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: var(--space-8);
  position: relative;
}

.cta-banner .btn {
  position: relative;
}

/* ========================================
   About Page
   ======================================== */
.about-story {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
}

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

.about-story h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: var(--space-6);
}

.about-story p {
  color: var(--color-neutral-700);
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

.about-image-placeholder {
  background: linear-gradient(135deg, var(--color-neutral-100), var(--color-neutral-200));
  border-radius: var(--radius-xl);
  height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
}

/* ========================================
   Process Timeline
   ======================================== */
.process-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .process-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-4);
  }
}

.process-step {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  position: relative;
}

.process-step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.125rem;
  margin: 0 auto var(--space-4);
}

.process-step h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.process-step p {
  font-size: 0.8125rem;
  color: var(--color-neutral-700);
}

/* ========================================
   Tech Grid
   ======================================== */
.tech-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-6);
}

.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-white);
  border: 1px solid var(--color-neutral-200);
  min-width: 120px;
  transition: all var(--transition-base);
}

.tech-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.tech-item span:first-child {
  font-size: 2rem;
}

.tech-item span:last-child {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-neutral-700);
}

/* ========================================
   Contact Page
   ======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
}

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

/* Form */
.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: var(--space-2);
  color: var(--color-neutral-900);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-neutral-900);
  background: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 150px;
}

.form-error {
  color: var(--color-primary);
  font-size: 0.8125rem;
  margin-top: var(--space-1);
  display: none;
}

.form-group.error .form-input,
.form-group.error .form-textarea {
  border-color: var(--color-primary);
}

.form-group.error .form-error {
  display: block;
}

/* Contact Info Cards */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact-info-card {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-neutral-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-neutral-200);
}

.contact-info-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(192, 57, 43, 0.1);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.contact-info-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.contact-info-card p {
  color: var(--color-neutral-700);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  background: var(--color-neutral-900);
  color: rgba(255, 255, 255, 0.75);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

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

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.7;
  margin-top: var(--space-4);
  max-width: 300px;
}

.footer-links h4,
.footer-contact h4 {
  color: var(--color-white);
  font-weight: 700;
  margin-bottom: var(--space-4);
  font-size: 1rem;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-contact p {
  font-size: 0.875rem;
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-8);
  text-align: center;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom p + p {
  margin-top: var(--space-1);
}

/* ========================================
   Scroll Animations
   ======================================== */
.js-ready [data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.js-ready [data-animate].in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .js-ready [data-animate] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}