/* ============================================
   株式会社ING - Corporate Website — Redesigned
   Color: Deep Navy + Refined Cyan accent
   ============================================ */

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

:root {
  --navy: #0a1628;
  --navy-light: #12203d;
  --navy-dark: #060e1a;
  --navy-mid: #0e1a32;
  --cyan: #00c8f0;
  --cyan-bright: #22e0ff;
  --cyan-dim: rgba(0, 200, 240, 0.12);
  --cyan-glow: rgba(0, 200, 240, 0.06);
  --cyan-subtle: rgba(0, 200, 240, 0.04);
  --gold: #f0b760;
  --gold-dim: rgba(240, 183, 96, 0.10);
  --white: #ffffff;
  --gray-50: #f7f9fc;
  --gray-100: #eef2f7;
  --gray-200: #dde4ed;
  --gray-300: #b8c4d4;
  --gray-400: #8899ad;
  --gray-500: #627286;
  --gray-600: #4a5568;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --font-main: 'Noto Sans JP', 'Helvetica Neue', Arial, sans-serif;
  --font-en: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --max-width: 1120px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 1px 3px rgba(10, 22, 40, 0.06);
  --shadow-md: 0 4px 16px rgba(10, 22, 40, 0.08);
  --shadow-lg: 0 12px 40px rgba(10, 22, 40, 0.12);
  --shadow-xl: 0 20px 60px rgba(10, 22, 40, 0.16);
  --shadow-cyan: 0 8px 32px rgba(0, 200, 240, 0.2);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--gray-800);
  line-height: 1.85;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: 0.01em;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 200, 240, 0.08);
  transition: var(--transition);
}

.header.scrolled {
  background: rgba(10, 22, 40, 0.95);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

.logo {
  display: flex;
  align-items: center;
  transition: var(--transition-fast);
}

.logo:hover {
  opacity: 0.85;
}

.logo img {
  height: 38px;
  width: auto;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 36px;
}

.nav-list a {
  color: var(--gray-300);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: var(--transition);
  transform: translateX(-50%);
  border-radius: 1px;
}

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

.nav-list a:hover::after,
.nav-list a.active::after {
  width: 100%;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  z-index: 10;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  transition: var(--transition);
  transform-origin: center;
  border-radius: 1px;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

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

.hero-bg-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 50%, rgba(0, 200, 240, 0.07) 0%, transparent 70%),
    radial-gradient(ellipse 60% 80% at 80% 30%, rgba(0, 200, 240, 0.04) 0%, transparent 70%),
    radial-gradient(ellipse 50% 50% at 50% 100%, rgba(240, 183, 96, 0.03) 0%, transparent 60%),
    linear-gradient(160deg, var(--navy-dark) 0%, var(--navy) 40%, var(--navy-light) 100%);
  z-index: 0;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 900px;
  height: 900px;
  background: radial-gradient(circle, rgba(0, 200, 240, 0.06) 0%, transparent 65%);
  border-radius: 50%;
  animation: heroFloat 12s ease-in-out infinite;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -25%;
  left: -8%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(0, 200, 240, 0.035) 0%, transparent 65%);
  border-radius: 50%;
  animation: heroFloat 16s ease-in-out infinite reverse;
  z-index: 0;
}

@keyframes heroFloat {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-40px) scale(1.03); }
}

/* Grid overlay */
.hero-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 200, 240, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 200, 240, 0.03) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 80%);
  z-index: 0;
}

/* Particle dots on hero */
.hero-particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}

.hero-particles .dot {
  position: absolute;
  border-radius: 50%;
  animation: particlePulse 4s ease-in-out infinite;
}

.hero-particles .dot-sm {
  width: 2px;
  height: 2px;
  background: rgba(0, 200, 240, 0.25);
}

.hero-particles .dot-md {
  width: 3px;
  height: 3px;
  background: rgba(0, 200, 240, 0.35);
  box-shadow: 0 0 6px rgba(0, 200, 240, 0.2);
}

.hero-particles .dot-lg {
  width: 4px;
  height: 4px;
  background: rgba(0, 200, 240, 0.15);
  box-shadow: 0 0 12px rgba(0, 200, 240, 0.15);
}

/* Connection lines between particles */
.hero-particles .line {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 200, 240, 0.08), transparent);
  transform-origin: left center;
}

@keyframes particlePulse {
  0%, 100% { opacity: 0.2; transform: scale(1); }
  50% { opacity: 0.9; transform: scale(1.3); }
}

@keyframes twinkle {
  0%, 100% { opacity: 0.2; }
  50% { opacity: 0.8; }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 140px 28px 100px;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-en);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 28px;
  padding: 8px 20px;
  border: 1px solid rgba(0, 200, 240, 0.2);
  border-radius: 100px;
  background: rgba(0, 200, 240, 0.05);
  backdrop-filter: blur(8px);
}

.hero-label::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--cyan);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.4); }
}

.hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.35;
  margin-bottom: 28px;
  letter-spacing: -0.01em;
}

.hero h1 .accent {
  color: var(--cyan);
  position: relative;
  display: inline-block;
}

.hero h1 .accent::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), rgba(0, 200, 240, 0.2));
  border-radius: 2px;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--gray-400);
  max-width: 600px;
  margin-bottom: 44px;
  line-height: 2;
  letter-spacing: 0.02em;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 64px;
  max-width: 820px;
}

.hero-stat {
  padding: 28px 16px;
  border: 1px solid rgba(0, 200, 240, 0.1);
  border-radius: var(--radius-md);
  background: rgba(0, 200, 240, 0.03);
  backdrop-filter: blur(4px);
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.hero-stat::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 200, 240, 0.3), transparent);
  opacity: 0;
  transition: var(--transition);
}

.hero-stat:hover {
  background: rgba(0, 200, 240, 0.06);
  border-color: rgba(0, 200, 240, 0.25);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 200, 240, 0.08);
}

.hero-stat:hover::before {
  opacity: 1;
}

.hero-stat .number {
  font-family: var(--font-en);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero-stat .label {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-top: 8px;
  letter-spacing: 0.02em;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 15px 34px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  letter-spacing: 0.02em;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: var(--transition-fast);
}

.btn:hover::after {
  opacity: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan), #00a8d4);
  color: var(--navy-dark);
  box-shadow: 0 4px 16px rgba(0, 200, 240, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-cyan);
  filter: brightness(1.08);
}

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

.btn-outline {
  background: transparent;
  color: var(--gray-200);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0, 200, 240, 0.05);
}

.btn-navy {
  background: linear-gradient(135deg, var(--navy), var(--navy-light));
  color: var(--white);
  border: 1px solid rgba(0, 200, 240, 0.15);
}

.btn-navy:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 200, 240, 0.3);
}

/* --- Sections --- */
.section {
  padding: 110px 0;
}

.section-dark {
  background: var(--gray-50);
}

.section-navy {
  background: linear-gradient(160deg, var(--navy-dark) 0%, var(--navy) 60%, var(--navy-light) 100%);
  color: var(--white);
  position: relative;
}

.section-navy::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 200, 240, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 200, 240, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black 10%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black 10%, transparent 80%);
  pointer-events: none;
}

.section-header {
  text-align: center;
  margin-bottom: 72px;
}

.section-header .label {
  font-family: var(--font-en);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 14px;
  display: inline-block;
}

.section-header h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.section-header p {
  color: var(--gray-500);
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.9;
  font-size: 0.95rem;
}

.section-navy .section-header p {
  color: var(--gray-400);
}

/* --- Cards --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 480px), 1fr));
  gap: 24px;
}

.card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 40px 34px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), rgba(0, 200, 240, 0.2));
  opacity: 0;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 200, 240, 0.2);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 58px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--cyan-dim), rgba(0, 200, 240, 0.06));
  color: var(--cyan);
  font-size: 1.5rem;
  margin-bottom: 22px;
  transition: var(--transition);
}

.card:hover .card-icon {
  background: linear-gradient(135deg, var(--cyan-dim), rgba(0, 200, 240, 0.12));
  transform: scale(1.05);
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.card p {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.85;
}

.card ul {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.85;
  padding-left: 20px;
  margin-top: 10px;
}

.card ul li {
  margin-bottom: 4px;
}

/* Dark cards (on navy bg) */
.card-dark {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(0, 200, 240, 0.1);
  backdrop-filter: blur(4px);
}

.card-dark:hover {
  background: rgba(0, 200, 240, 0.05);
  border-color: rgba(0, 200, 240, 0.25);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.card-dark h3 {
  color: var(--white);
}

.card-dark p,
.card-dark ul {
  color: var(--gray-300);
}

/* --- Pain Points --- */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.pain-item {
  padding: 32px 24px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.pain-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0;
  transition: var(--transition);
}

.pain-item:hover {
  background: rgba(0, 200, 240, 0.05);
  border-color: rgba(0, 200, 240, 0.15);
  transform: translateY(-3px);
}

.pain-item:hover::after {
  opacity: 0.5;
}

.pain-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
  filter: drop-shadow(0 2px 8px rgba(0, 200, 240, 0.15));
}

.pain-item h4 {
  font-size: 0.95rem;
  color: var(--white);
  margin-bottom: 10px;
  font-weight: 600;
}

.pain-item p {
  font-size: 0.87rem;
  color: var(--gray-400);
  line-height: 1.75;
}

/* --- Case Study --- */
.case-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 44px 40px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.case-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--cyan), var(--navy));
  border-radius: 0 2px 2px 0;
}

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

.case-badge {
  display: inline-block;
  font-size: 0.73rem;
  font-weight: 600;
  color: var(--cyan);
  background: var(--cyan-dim);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 18px;
  letter-spacing: 0.03em;
}

.case-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.case-card p {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.85;
  margin-bottom: 24px;
}

.case-result {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.case-result-item {
  padding: 20px 28px;
  background: var(--gray-50);
  border-radius: var(--radius-md);
  text-align: center;
  min-width: 140px;
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}

.case-result-item:hover {
  border-color: rgba(0, 200, 240, 0.2);
  transform: translateY(-2px);
}

.case-result-item .big {
  font-family: var(--font-en);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.case-result-item .small {
  font-size: 0.78rem;
  color: var(--gray-500);
  margin-top: 4px;
}

/* --- Profile --- */
.profile-section {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 52px;
  align-items: start;
}

.profile-icon {
  width: 200px;
  height: 200px;
  background: linear-gradient(135deg, var(--navy), var(--navy-light));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  font-size: 3.5rem;
  font-weight: 700;
  font-family: var(--font-en);
  border: 2px solid rgba(0, 200, 240, 0.15);
  box-shadow: 0 8px 32px rgba(10, 22, 40, 0.15);
  letter-spacing: 0.05em;
}

.profile-info h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.profile-info .title {
  font-size: 0.88rem;
  color: var(--cyan);
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.profile-info p {
  font-size: 0.93rem;
  color: var(--gray-600);
  line-height: 2;
  margin-bottom: 20px;
}

/* Skill tags */
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.skill-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 100px;
  background: var(--cyan-dim);
  color: var(--navy);
  border: 1px solid rgba(0, 200, 240, 0.15);
  transition: var(--transition-fast);
}

.skill-tag:hover {
  background: rgba(0, 200, 240, 0.18);
  border-color: rgba(0, 200, 240, 0.3);
}

/* Qualifications */
.qual-list {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.qual-item {
  font-size: 0.85rem;
  padding: 8px 16px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  color: var(--gray-600);
}

/* --- Timeline --- */
.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--gray-200));
}

.timeline-item {
  padding-left: 60px;
  padding-bottom: 40px;
  position: relative;
  transition: var(--transition);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 13px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--white);
  border: 3px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 200, 240, 0.1);
  transition: var(--transition);
  z-index: 1;
}

.timeline-item:hover::before {
  box-shadow: 0 0 0 6px rgba(0, 200, 240, 0.15);
  background: var(--cyan);
}

.timeline-year {
  font-family: var(--font-en);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}

.timeline-item h4 {
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.timeline-item p {
  font-size: 0.87rem;
  color: var(--gray-500);
  line-height: 1.75;
}

/* --- Concept (philosophy) --- */
.concept-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.concept-item {
  text-align: center;
  padding: 44px 28px;
  border-radius: var(--radius-md);
  transition: var(--transition);
  position: relative;
}

.concept-item:hover {
  background: rgba(0, 200, 240, 0.03);
}

.concept-num {
  font-family: var(--font-en);
  font-size: 3.2rem;
  font-weight: 800;
  background: linear-gradient(180deg, rgba(0, 200, 240, 0.2), rgba(0, 200, 240, 0.04));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
}

.concept-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 14px;
}

.concept-item p {
  font-size: 0.87rem;
  color: var(--gray-400);
  line-height: 1.85;
}

/* --- Tech Stack --- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

.tech-item {
  padding: 24px 16px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.tech-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transition: var(--transition);
}

.tech-item:hover {
  border-color: rgba(0, 200, 240, 0.25);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.tech-item:hover::after {
  transform: scaleX(1);
}

.tech-item .tech-name {
  font-family: var(--font-en);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 4px;
}

.tech-item .tech-years {
  font-size: 0.73rem;
  color: var(--gray-400);
}

/* --- About page --- */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 32px;
}

.info-table th,
.info-table td {
  padding: 18px 24px;
  border-bottom: 1px solid var(--gray-200);
  text-align: left;
  font-size: 0.93rem;
}

.info-table th {
  width: 160px;
  background: var(--gray-50);
  font-weight: 600;
  color: var(--navy);
  letter-spacing: 0.02em;
}

.info-table tr:hover td {
  background: rgba(0, 200, 240, 0.02);
}

/* --- Contact --- */
.contact-wrapper {
  max-width: 800px;
  margin: 0 auto;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 28px;
  background: var(--gray-50);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}

.contact-item:hover {
  border-color: rgba(0, 200, 240, 0.15);
  box-shadow: var(--shadow-sm);
}

.contact-item .icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--cyan-dim), rgba(0, 200, 240, 0.06));
  color: var(--navy);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-item .text h4 {
  font-size: 0.82rem;
  color: var(--gray-500);
  font-weight: 500;
  margin-bottom: 4px;
  letter-spacing: 0.02em;
}

.contact-item .text p {
  font-size: 0.95rem;
  font-weight: 600;
}

.form-embed {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

/* --- Privacy --- */
.privacy-content {
  max-width: 800px;
  margin: 0 auto;
}

.privacy-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
  margin-top: 44px;
  margin-bottom: 14px;
  padding-left: 18px;
  border-left: 3px solid var(--cyan);
}

.privacy-content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--navy);
  margin-top: 20px;
  margin-bottom: 8px;
}

.privacy-content p,
.privacy-content ul {
  font-size: 0.93rem;
  color: var(--gray-600);
  margin-bottom: 16px;
}

.privacy-content ul {
  padding-left: 24px;
}

.privacy-content li {
  margin-bottom: 8px;
}

/* --- Footer --- */
.footer {
  background: var(--navy-dark);
  color: var(--gray-400);
  padding: 72px 0 32px;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 200, 240, 0.15), transparent);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-logo {
  margin-bottom: 14px;
}

.footer-logo img {
  height: 32px;
  width: auto;
}

.footer-desc {
  font-size: 0.85rem;
  max-width: 300px;
  line-height: 1.85;
}

.footer-nav h4 {
  color: var(--white);
  font-size: 0.88rem;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.footer-nav ul {
  list-style: none;
}

.footer-nav li {
  margin-bottom: 10px;
}

.footer-nav a {
  font-size: 0.85rem;
  transition: var(--transition-fast);
  position: relative;
}

.footer-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--cyan);
}

.footer-nav a:hover::after {
  width: 100%;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 28px;
  text-align: center;
  font-size: 0.78rem;
  font-family: var(--font-en);
  letter-spacing: 0.02em;
  color: var(--gray-500);
}

/* --- Page Header (subpages) --- */
.page-header {
  background: linear-gradient(160deg, var(--navy-dark) 0%, var(--navy) 100%);
  padding: 150px 0 70px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -25%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 200, 240, 0.05) 0%, transparent 65%);
  border-radius: 50%;
}

.page-header::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -15%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 200, 240, 0.03) 0%, transparent 65%);
  border-radius: 50%;
}

.page-header h1 {
  font-size: clamp(1.8rem, 3.8vw, 2.6rem);
  color: var(--white);
  margin-bottom: 12px;
  position: relative;
  letter-spacing: -0.01em;
}

.page-header p {
  color: var(--gray-400);
  font-size: 0.95rem;
  font-family: var(--font-en);
  letter-spacing: 0.12em;
  position: relative;
}

/* --- Breadcrumb --- */
.breadcrumb {
  padding: 18px 0;
  font-size: 0.8rem;
  color: var(--gray-400);
  letter-spacing: 0.01em;
}

.breadcrumb a {
  color: var(--gray-400);
  transition: var(--transition-fast);
}

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

/* --- CTA --- */
.cta-section {
  text-align: center;
  padding: 100px 28px;
  background: linear-gradient(160deg, var(--navy) 0%, var(--navy-light) 100%);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(0, 200, 240, 0.05) 0%, transparent 65%);
  border-radius: 50%;
}

.cta-section::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 200, 240, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 200, 240, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 50% 50% at 50% 50%, black 10%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 50% 50% at 50% 50%, black 10%, transparent 70%);
  pointer-events: none;
}

.cta-section h2 {
  color: var(--white);
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  margin-bottom: 18px;
  position: relative;
  z-index: 1;
  letter-spacing: -0.01em;
}

.cta-section p {
  color: var(--gray-400);
  margin-bottom: 36px;
  position: relative;
  z-index: 1;
  line-height: 1.9;
}

.cta-section .btn {
  position: relative;
  z-index: 1;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-list {
    position: fixed;
    top: 76px;
    left: 0;
    width: 100%;
    background: rgba(10, 22, 40, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    padding: 36px 0;
    gap: 24px;
    transform: translateY(-120%);
    transition: var(--transition);
    border-bottom: 1px solid rgba(0, 200, 240, 0.08);
  }

  .nav-list.open {
    transform: translateY(0);
  }

  .hero-content {
    padding: 120px 24px 80px;
  }

  .hero-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .hero-stat {
    padding: 20px 12px;
  }

  .hero-stat .number {
    font-size: 1.6rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 36px;
  }

  .info-table th {
    width: 120px;
  }

  .profile-section {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .profile-icon {
    margin: 0 auto;
    width: 160px;
    height: 160px;
    font-size: 2.8rem;
  }

  .skill-tags {
    justify-content: center;
  }

  .concept-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .concept-item {
    padding: 32px 20px;
  }

  .case-result {
    flex-direction: column;
  }

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

  .section {
    padding: 80px 0;
  }

  .section-header {
    margin-bottom: 52px;
  }

  .case-card {
    padding: 32px 28px;
  }
}

@media (max-width: 480px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

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

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-content {
    padding: 110px 20px 64px;
  }

  .card {
    padding: 32px 24px;
  }
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* Slide in from left */
.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Scale fade */
.scale-fade {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.scale-fade.visible {
  opacity: 1;
  transform: scale(1);
}

/* --- Hero Buttons (extracted from inline) --- */
.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- Concept Grid Background (extracted from inline) --- */
.concept-grid-bg {
  background: linear-gradient(160deg, var(--navy-dark), var(--navy), var(--navy-light));
  border-radius: var(--radius-xl);
  padding: 24px;
  border: 1px solid rgba(0, 200, 240, 0.06);
}

/* --- Message Text (about page, extracted from inline) --- */
.message-text {
  font-size: 1.05rem;
  line-height: 2.2;
  color: var(--gray-300);
}

.message-text + .message-text {
  margin-top: 20px;
}

.message-author {
  margin-top: 40px;
  font-weight: 700;
  color: var(--white);
  font-size: 1rem;
  letter-spacing: 0.02em;
}

/* --- Table Responsive Wrapper --- */
.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
}

.table-responsive .info-table {
  margin-top: 0;
}

/* --- Form Embed Responsive --- */
.form-embed iframe {
  max-width: 100%;
  height: min(800px, 85vh);
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 12px 24px;
  background: var(--cyan);
  color: var(--navy-dark);
  font-weight: 600;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* --- Content Links (body text) --- */
.privacy-content a,
.content-link {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.privacy-content a:hover,
.content-link:hover {
  color: var(--cyan);
}

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

  html {
    scroll-behavior: auto;
  }

  .fade-in,
  .scale-fade {
    opacity: 1;
    transform: none;
  }

  .slide-in-left {
    opacity: 1;
    transform: none;
  }
}

/* --- Table Stacking on Small Screens --- */
@media (max-width: 480px) {
  .info-table,
  .info-table thead,
  .info-table tbody,
  .info-table tr,
  .info-table th,
  .info-table td {
    display: block;
    width: 100%;
  }

  .info-table th {
    background: var(--navy);
    color: var(--white);
    padding: 10px 16px;
    font-size: 0.85rem;
  }

  .info-table td {
    padding: 12px 16px;
  }

  .table-responsive {
    border: none;
  }
}

/* --- Staggered card animations --- */
.card-grid .card:nth-child(1) { transition-delay: 0s; }
.card-grid .card:nth-child(2) { transition-delay: 0.05s; }
.card-grid .card:nth-child(3) { transition-delay: 0.1s; }
.card-grid .card:nth-child(4) { transition-delay: 0.15s; }

/* --- Floating decoration on sections --- */
.section-decorated {
  position: relative;
}

.section-decorated::after {
  content: '';
  position: absolute;
  top: -80px;
  right: -100px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(0, 200, 240, 0.03) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}