/* ============================================
   DK Star HK - Brand Website
   Design System & Styles
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-primary: #0A2540;
  --color-primary-light: #1a3a5c;
  --color-accent: #2563EB;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: rgba(37, 99, 235, 0.1);
  --color-accent-glow: rgba(37, 99, 235, 0.3);
  --color-cta: #F97316;
  --color-cta-hover: #ea580c;
  --color-cta-glow: rgba(249, 115, 22, 0.3);
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFC;
  --color-bg-dark: #0A2540;
  --color-bg-section: #F1F5F9;
  --color-text: #1E293B;
  --color-text-secondary: #64748B;
  --color-text-light: #CBD5E1;
  --color-text-white: #FFFFFF;
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;
  --color-success: #10B981;
  --color-card-shadow: rgba(10, 37, 64, 0.08);

  /* Typography */
  --font-heading: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 80px;

  /* Layout */
  --max-width: 1200px;
  --header-height: 80px;
  --card-radius: 12px;
  --button-radius: 8px;
  --section-padding: var(--space-4xl) 0;

  /* Transitions */
  --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-page: 600ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(10, 37, 64, 0.08);
  --shadow-md: 0 4px 12px rgba(10, 37, 64, 0.1);
  --shadow-lg: 0 8px 30px rgba(10, 37, 64, 0.12);
  --shadow-xl: 0 20px 60px rgba(10, 37, 64, 0.15);
  --shadow-glow: 0 0 20px var(--color-accent-glow);
  --shadow-card-hover: 0 12px 40px rgba(10, 37, 64, 0.15);

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.12);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  --glass-blur: 12px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: var(--font-body);
  border: none;
  outline: none;
}

input, textarea, select {
  font-family: var(--font-body);
  outline: none;
}

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--section-padding);
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.section-subtitle {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-3xl);
  line-height: 1.6;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 14px 28px;
  border-radius: var(--button-radius);
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn:active {
  transform: scale(0.98);
  transition-duration: 100ms;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-text-white);
  box-shadow: 0 4px 14px var(--color-accent-glow);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 6px 20px var(--color-accent-glow);
  transform: translateY(-1px);
  color: var(--color-text-white);
}

.btn-cta {
  background: var(--color-cta);
  color: var(--color-text-white);
  box-shadow: 0 4px 14px var(--color-cta-glow);
}

.btn-cta:hover {
  background: var(--color-cta-hover);
  box-shadow: 0 6px 24px var(--color-cta-glow);
  transform: translateY(-1px);
  color: var(--color-text-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-white);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-text-white);
  transform: translateY(-1px);
  color: var(--color-text-white);
}

.btn-outline-dark {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn-outline-dark:hover {
  background: var(--color-accent);
  color: var(--color-text-white);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: all var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  text-decoration: none;
  flex-shrink: 0;
}

.header__logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-cta));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 1.125rem;
  flex-shrink: 0;
}

.header__logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.header__logo-text .en {
  display: none;
}

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

.header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.header__nav-link {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  padding: 4px 0;
  position: relative;
  transition: color var(--transition-fast);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
  border-radius: 1px;
}

.header__nav-link:hover,
.header__nav-link.active {
  color: var(--color-accent);
}

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

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

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--color-bg-alt);
  border-radius: 6px;
  padding: 2px;
  border: 1px solid var(--color-border);
}

.lang-switcher__btn {
  padding: 6px 12px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  background: transparent;
  border-radius: 4px;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.lang-switcher__btn.active {
  background: var(--color-accent);
  color: var(--color-text-white);
  box-shadow: var(--shadow-sm);
}

.lang-switcher__btn:not(.active):hover {
  color: var(--color-accent);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2.5px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  max-width: 400px;
  height: 100vh;
  background: var(--color-bg);
  z-index: 999;
  padding: calc(var(--header-height) + var(--space-lg)) var(--space-lg) var(--space-lg);
  transition: right var(--transition-slow);
  box-shadow: var(--shadow-xl);
  overflow-y: auto;
}

.mobile-menu.open {
  right: 0;
}

.mobile-menu__overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.mobile-menu__overlay.open {
  display: block;
  opacity: 1;
}

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.mobile-menu__link {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast);
}

.mobile-menu__link:hover,
.mobile-menu__link.active {
  color: var(--color-accent);
}

.mobile-menu__actions {
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  overflow: hidden;
}

.hero__background {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(10, 37, 64, 0.88), rgba(10, 37, 64, 0.75)),
    url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800"><rect fill="%230A2540" width="1200" height="800"/><rect fill="%231a3a5c" x="50" y="50" width="500" height="300" rx="8" opacity="0.3"/><rect fill="%232563EB" x="650" y="50" width="500" height="200" rx="8" opacity="0.15"/><rect fill="%231a3a5c" x="650" y="280" width="500" height="220" rx="8" opacity="0.25"/><rect fill="%232563EB" x="50" y="380" width="500" height="180" rx="8" opacity="0.1"/><circle cx="1000" cy="600" r="120" fill="%232563EB" opacity="0.08"/><circle cx="100" cy="700" r="80" fill="%23F97316" opacity="0.06"/></svg>')
    center/cover no-repeat;
  background-color: var(--color-primary);
}

.hero__background::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.15), transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(249, 115, 22, 0.08), transparent 60%);
}

.hero__grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: var(--space-3xl) var(--space-lg);
}

.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  color: var(--color-text-light);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--space-xl);
  backdrop-filter: blur(4px);
}

.hero__tag-dot {
  width: 6px;
  height: 6px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  color: var(--color-text-white);
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
}

.hero__title .highlight {
  background: linear-gradient(135deg, var(--color-accent), #60A5FA);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: var(--space-2xl);
  max-width: 600px;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-light);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  animation: float 3s ease-in-out infinite;
  z-index: 2;
}

.hero__scroll-indicator .scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-text-light), transparent);
}

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

/* --- Business Services Section --- */
.services {
  background: var(--color-bg);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-lg);
}

.service-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-base);
  cursor: default;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-cta));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-md);
  background: var(--color-accent-light);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  transition: all var(--transition-base);
}

.service-card:hover .service-card__icon {
  background: var(--color-accent);
  color: var(--color-text-white);
  box-shadow: 0 4px 14px var(--color-accent-glow);
}

.service-card__icon svg {
  width: 28px;
  height: 28px;
}

.service-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.service-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.service-card__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  transition: gap var(--transition-fast);
}

.service-card__link:hover {
  gap: 8px;
}

/* --- Stats / Credibility Section --- */
.stats {
  background: var(--color-primary);
  position: relative;
  overflow: hidden;
}

.stats::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.12), transparent 50%),
    radial-gradient(ellipse at 80% 50%, rgba(249, 115, 22, 0.06), transparent 50%);
}

.stats__grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2xl);
  text-align: center;
}

.stats__item-number {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  font-weight: 800;
  color: var(--color-text-white);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.stats__item-number .suffix {
  color: var(--color-cta);
}

.stats__item-label {
  font-size: 1rem;
  color: var(--color-text-light);
}

/* --- Brand Logos --- */
.brands {
  padding: var(--space-3xl) 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.brands__title {
  text-align: center;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.brands__grid {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}

.brands__item {
  height: 40px;
  opacity: 0.5;
  transition: opacity var(--transition-base);
  filter: grayscale(1);
}

.brands__item:hover {
  opacity: 1;
  filter: grayscale(0);
}

.brands__item svg, .brands__item img {
  height: 100%;
  width: auto;
}

/* Brand placeholder boxes */
.brand-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  height: 40px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

/* --- Case Studies Section --- */
.cases__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xl);
}

.case-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
  background: var(--color-bg);
  border-radius: var(--card-radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.case-card:hover {
  box-shadow: var(--shadow-lg);
}

.case-card:nth-child(even) .case-card__image {
  order: 1;
}

.case-card:nth-child(even) .case-card__content {
  order: 0;
  padding-left: var(--space-2xl);
}

.case-card:nth-child(odd) .case-card__content {
  padding-right: var(--space-2xl);
}

.case-card__image {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.case-card__image-bg {
  position: absolute;
  inset: 0;
  opacity: 0.1;
  background-image:
    radial-gradient(circle at 30% 40%, var(--color-accent) 0%, transparent 50%),
    radial-gradient(circle at 70% 60%, var(--color-cta) 0%, transparent 50%);
}

.case-card__image-icon {
  position: relative;
  z-index: 2;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.8);
}

.case-card__image-icon svg {
  width: 40px;
  height: 40px;
}

.case-card__tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 20px;
  font-size: 0.8125rem;
  font-weight: 500;
  margin-bottom: var(--space-md);
}

.case-card__title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.case-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.case-card__details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.case-card__detail-item label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.case-card__detail-item span {
  font-size: 0.875rem;
  color: var(--color-text);
  font-weight: 500;
}

.case-card__content {
  padding: var(--space-lg) 0;
}

/* --- Footer --- */
.footer {
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand-desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-top: var(--space-md);
  color: var(--color-text-light);
}

.footer__heading {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: var(--space-lg);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__link {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-size: 0.9375rem;
}

.footer__contact-icon {
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 0.875rem;
}

.footer__bottom-links {
  display: flex;
  gap: var(--space-lg);
}

.footer__bottom-link {
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.875rem;
}

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

/* --- Page Header (inner pages) --- */
.page-header {
  padding-top: calc(var(--header-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
  background: var(--color-primary);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.1), transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(249, 115, 22, 0.05), transparent 60%);
}

.page-header__content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.page-header__title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--color-text-white);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.page-header__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* --- About Page --- */
.about__intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  margin-bottom: var(--space-3xl);
}

.about__intro-text h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
}

.about__intro-text p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.about__intro-image {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  border-radius: var(--card-radius);
  min-height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.about__intro-image-bg {
  position: absolute;
  inset: 0;
  opacity: 0.08;
  background-image:
    radial-gradient(circle at 30% 40%, var(--color-accent) 0%, transparent 50%),
    radial-gradient(circle at 70% 60%, var(--color-cta) 0%, transparent 50%);
}

.about__intro-image-icon {
  position: relative;
  z-index: 2;
  text-align: center;
  color: rgba(255, 255, 255, 0.7);
}

.about__intro-image-icon svg {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-md);
}

.about__values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.value-card {
  text-align: center;
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  transition: all var(--transition-base);
}

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

.value-card__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-md);
  background: var(--color-accent-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.value-card__icon svg {
  width: 24px;
  height: 24px;
}

.value-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.value-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Certifications --- */
.certifications {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  justify-content: center;
  padding: var(--space-2xl) 0;
}

.cert-badge {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  min-width: 180px;
}

.cert-badge__icon {
  width: 40px;
  height: 40px;
  background: var(--color-accent-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  flex-shrink: 0;
}

.cert-badge__icon svg {
  width: 22px;
  height: 22px;
}

.cert-badge__label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

/* --- Contact Page --- */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.contact__info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
}

.contact__info-icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  flex-shrink: 0;
}

.contact__info-icon svg {
  width: 22px;
  height: 22px;
}

.contact__info-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.contact__info-value {
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 500;
}

.contact__info-value a {
  color: var(--color-accent);
}

.contact__map {
  background: var(--color-bg-alt);
  border-radius: var(--card-radius);
  min-height: 200px;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

/* --- Contact Form --- */
.contact-form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: var(--space-xl);
}

.contact-form__title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
}

.contact-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.contact-form__group {
  margin-bottom: var(--space-md);
}

.contact-form__label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.contact-form__label .required {
  color: #EF4444;
}

.contact-form__input,
.contact-form__textarea,
.contact-form__select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition-fast);
}

.contact-form__input:focus,
.contact-form__textarea:focus,
.contact-form__select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.contact-form__textarea {
  min-height: 120px;
  resize: vertical;
}

.contact-form__submit {
  width: 100%;
  margin-top: var(--space-md);
}

/* Form success message */
.form-success {
  display: none;
  text-align: center;
  padding: var(--space-2xl);
}

.form-success.show {
  display: block;
}

.form-success__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  background: var(--color-success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  animation: scale-in 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.form-success__icon svg {
  width: 32px;
  height: 32px;
}

.form-success__title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.form-success__desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.form-success .btn {
  min-width: 200px;
}

@keyframes scale-in {
  0% { transform: scale(0); }
  60% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

/* --- Solutions Page Detail --- */
.solution-detail__overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  margin-bottom: var(--space-3xl);
}

.solution-detail__tags {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

.solution-detail__visual {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  border-radius: var(--card-radius);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.solution-detail__advantages {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin: var(--space-2xl) 0;
}

.advantage-card {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  transition: all var(--transition-base);
}

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

.advantage-card__icon {
  width: 44px;
  height: 44px;
  background: var(--color-accent-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  flex-shrink: 0;
}

.advantage-card__icon svg {
  width: 22px;
  height: 22px;
}

.advantage-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.advantage-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Products Page --- */
.products__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.product-card {
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  background: var(--color-bg);
}

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

.product-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-md);
  background: var(--color-accent-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.product-card__icon svg {
  width: 24px;
  height: 24px;
}

.product-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.product-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.product-card__features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.product-card__feature {
  padding: 4px 10px;
  background: var(--color-bg-alt);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* --- Solution Scenarios --- */
.scenarios {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin: var(--space-2xl) 0;
}

.scenario-card {
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  transition: all var(--transition-base);
}

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

.scenario-card__number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: var(--space-md);
}

.scenario-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.scenario-card__pain {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  padding: 4px 0;
}

.scenario-card__pain strong {
  color: #EF4444;
}

.scenario-card__solution {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.scenario-card__solution strong {
  color: var(--color-success);
}

/* --- Sticky CTA --- */
.sticky-cta {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-sm);
}

.sticky-cta__btn {
  padding: 14px 24px;
  background: var(--color-cta);
  color: var(--color-text-white);
  border-radius: 50px;
  font-size: 0.9375rem;
  font-weight: 600;
  box-shadow: 0 4px 20px var(--color-cta-glow);
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border: none;
  cursor: pointer;
}

.sticky-cta__btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--color-cta-glow);
  color: var(--color-text-white);
}

/* --- Modal --- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 2000;
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.modal-overlay.open {
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
}

.modal {
  background: var(--color-bg);
  border-radius: var(--card-radius);
  width: 90%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  padding: var(--space-xl);
  position: relative;
  transform: translateY(20px);
  transition: transform var(--transition-base);
}

.modal-overlay.open .modal {
  transform: translateY(0);
}

.modal__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 36px;
  height: 36px;
  background: var(--color-bg-alt);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  border: none;
  cursor: pointer;
}

.modal__close:hover {
  background: var(--color-border);
  color: var(--color-text);
}

.modal__title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.modal__desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.modal .contact-form__row {
  grid-template-columns: 1fr;
}

/* --- Scroll Animations (AOS) --- */
[data-aos] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

[data-aos].aos-animate {
  opacity: 1;
  transform: translateY(0);
}

[data-aos="fade-up"].aos-animate {
  opacity: 1;
  transform: translateY(0);
}

[data-aos="fade-left"] {
  opacity: 0;
  transform: translateX(30px);
}

[data-aos="fade-left"].aos-animate {
  opacity: 1;
  transform: translateX(0);
}

[data-aos="fade-right"] {
  opacity: 0;
  transform: translateX(-30px);
}

[data-aos="fade-right"].aos-animate {
  opacity: 1;
  transform: translateX(0);
}

[data-aos="fade-up"].aos-delay-1 { transition-delay: 50ms; }
[data-aos="fade-up"].aos-delay-2 { transition-delay: 100ms; }
[data-aos="fade-up"].aos-delay-3 { transition-delay: 150ms; }
[data-aos="fade-up"].aos-delay-4 { transition-delay: 200ms; }
[data-aos].aos-delay-1 { transition-delay: 50ms; }
[data-aos].aos-delay-2 { transition-delay: 100ms; }
[data-aos].aos-delay-3 { transition-delay: 150ms; }
[data-aos].aos-delay-4 { transition-delay: 200ms; }
[data-aos].aos-delay-5 { transition-delay: 250ms; }
[data-aos].aos-delay-6 { transition-delay: 300ms; }

/* --- Page Sections (SPA) --- */
.page-section {
  display: none;
}

.page-section.active {
  display: block;
  animation: fadeInPage var(--transition-page);
}

@keyframes fadeInPage {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  left: var(--space-xl);
  width: 44px;
  height: 44px;
  background: var(--color-accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  z-index: 100;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-accent-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* --- Section inner page navigation --- */
.section-nav {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.section-nav__btn {
  padding: 8px 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.section-nav__btn:hover,
.section-nav__btn.active {
  background: var(--color-accent);
  color: var(--color-text-white);
  border-color: var(--color-accent);
}

/* --- Responsive Design --- */

/* Tablet: 768px - 1023px */
@media (max-width: 1023px) {
  .services__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .services__grid .service-card:nth-child(4),
  .services__grid .service-card:nth-child(5) {
    grid-column: span 1;
  }

  .case-card {
    grid-template-columns: 1fr;
  }

  .case-card:nth-child(even) .case-card__image {
    order: 0;
  }

  .case-card:nth-child(even) .case-card__content {
    padding-left: 0;
  }

  .case-card:nth-child(odd) .case-card__content {
    padding-right: 0;
  }

  .case-card__content {
    padding: var(--space-lg) var(--space-lg) var(--space-xl);
  }

  .case-card__image {
    min-height: 220px;
  }

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

  .about__intro {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .about__values {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .products__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .solution-detail__overview {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .solution-detail__advantages {
    grid-template-columns: 1fr;
  }

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

  .stats__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
  }
}

/* Mobile: < 768px */
@media (max-width: 767px) {
  :root {
    --header-height: 64px;
  }

  .header__nav-list {
    display: none;
  }

  .header__actions .btn {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }

  .services__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

  .services__grid .service-card:nth-child(5) {
    grid-column: 1 / -1;
    max-width: 280px;
    margin: 0 auto;
  }

  .service-card {
    padding: var(--space-lg);
  }

  .service-card__icon {
    width: 48px;
    height: 48px;
  }

  .service-card__icon svg {
    width: 24px;
    height: 24px;
  }

  .stats__grid {
    gap: var(--space-lg);
  }

  .stats__item-number {
    font-size: 2rem;
  }

  .brands__grid {
    gap: var(--space-lg);
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

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

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

  .contact-form__row {
    grid-template-columns: 1fr;
  }

  .sticky-cta__btn span {
    display: none;
  }

  .sticky-cta__btn {
    padding: 14px;
    border-radius: 50%;
  }

  .sticky-cta__btn svg {
    margin: 0;
  }

  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
    justify-content: center;
  }

  .case-card__details {
    grid-template-columns: 1fr;
  }

  .modal {
    padding: var(--space-lg);
    width: 95%;
  }

  .back-to-top {
    bottom: var(--space-md);
    left: var(--space-md);
    width: 40px;
    height: 40px;
  }

  .scenario-card {
    padding: var(--space-lg);
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .services__grid {
    grid-template-columns: 1fr;
  }

  .services__grid .service-card:nth-child(5) {
    max-width: 100%;
  }

  .stats__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .certifications {
    flex-direction: column;
    align-items: center;
  }

  .advantage-card {
    flex-direction: column;
    text-align: center;
  }

  .advantage-card__icon {
    margin: 0 auto;
  }
}