/* ============================================
   잘만든 - 메인 스타일시트
   화이트 톤 / 미니멀 / 반응형
   ============================================ */

/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #1E40AF;
  --color-primary-dark: #1e3a8a;
  --color-primary-light: #3B82F6;
  --color-primary-pale: #EFF6FF;
  --color-accent: #0EA5E9;
  --color-black: #0F172A;
  --color-dark: #1E293B;
  --color-gray-700: #374151;
  --color-gray-600: #4B5563;
  --color-gray-500: #6B7280;
  --color-gray-400: #9CA3AF;
  --color-gray-300: #D1D5DB;
  --color-gray-200: #E5E7EB;
  --color-gray-100: #F3F4F6;
  --color-gray-50: #F9FAFB;
  --color-white: #FFFFFF;
  --color-success: #10B981;
  --color-danger: #EF4444;

  --font-sans: 'Noto Sans KR', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
  --shadow-xl: 0 24px 60px rgba(0,0,0,0.12);
  --shadow-blue: 0 8px 30px rgba(30, 64, 175, 0.25);

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  --container-max: 1200px;
  --container-pad: 24px;
  --header-h: 72px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-dark);
  background: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

ul, ol {
  list-style: none;
}

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

/* ===== SKIP LINK ===== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-size: 14px;
  font-weight: 600;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 8px;
}

/* ===== CONTAINER ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
  border: 2px solid transparent;
  line-height: 1;
}

.btn--lg {
  padding: 16px 32px;
  font-size: 16px;
}

.btn--md {
  padding: 12px 24px;
  font-size: 15px;
}

.btn--full {
  width: 100%;
  justify-content: center;
  border-radius: var(--radius-lg);
  padding: 18px 24px;
  font-size: 17px;
}

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

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--color-primary-dark);
  box-shadow: 0 12px 40px rgba(30, 64, 175, 0.35);
  transform: translateY(-2px);
  color: var(--color-white);
}

.btn--primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-blue);
}

.btn--secondary {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}

.btn--secondary:hover,
.btn--secondary:focus-visible {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-primary);
}

/* Focus visible */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ===== LOGO ===== */
.logo {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: var(--color-black);
}
.logo__dot {
  color: var(--color-primary);
  font-size: 28px;
  line-height: 1;
}
.logo--white .logo__text {
  color: var(--color-white);
}
.logo--white .logo__dot {
  color: var(--color-primary-light);
}

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  z-index: 900;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}

.header.scrolled {
  border-bottom-color: var(--color-gray-200);
  box-shadow: var(--shadow-sm);
  background: rgba(255,255,255,0.97);
}

.header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* ===== NAV ===== */
.nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav__link {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-gray-600);
  border-radius: var(--radius-sm);
  transition: color var(--transition-base), background var(--transition-base);
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--color-primary);
  background: var(--color-primary-pale);
}

.nav__link.nav__cta {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-weight: 600;
  box-shadow: var(--shadow-blue);
  margin-left: 8px;
}

.nav__link.nav__cta:hover,
.nav__link.nav__cta:focus-visible {
  background: var(--color-primary-dark);
  color: var(--color-white);
  box-shadow: 0 8px 24px rgba(30,64,175,0.35);
  transform: translateY(-1px);
}

/* ===== HAMBURGER ===== */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  padding: 8px;
  background: transparent;
  transition: background var(--transition-base);
}
.hamburger:hover { background: var(--color-gray-100); }

.hamburger__line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

.hamburger.open .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open .hamburger__line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger.open .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== MOBILE NAV ===== */
@media (max-width: 767px) {
  .hamburger { display: flex; }

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-lg);
    transform: translateY(-110%);
    opacity: 0;
    transition: transform var(--transition-slow), opacity var(--transition-slow);
    z-index: 800;
    pointer-events: none;
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px;
  }

  .nav__link {
    padding: 14px 16px;
    font-size: 16px;
    border-radius: var(--radius-md);
  }

  .nav__link.nav__cta {
    margin: 8px 0 0 0;
    border-radius: var(--radius-md);
    text-align: center;
    padding: 14px 16px;
  }
}

/* ===== SECTION COMMON ===== */
.section {
  padding: 100px 0;
}
.section--gray {
  background: var(--color-gray-50);
}

.section__header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}

.section__label {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-pale);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section__title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  color: var(--color-black);
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.section__desc {
  font-size: 17px;
  color: var(--color-gray-600);
  line-height: 1.75;
}

.section__desc strong {
  color: var(--color-primary);
  font-weight: 700;
}

.accent {
  color: var(--color-primary);
  font-style: normal;
}

.pc-only {
  display: block;
}

/* ===== ANIMATIONS ===== */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  animation: fadeInUp 0.75s ease forwards;
}

.fade-in:nth-child(1) { animation-delay: 0.1s; }
.fade-in:nth-child(2) { animation-delay: 0.25s; }
.fade-in:nth-child(3) { animation-delay: 0.4s; }
.fade-in:nth-child(4) { animation-delay: 0.55s; }
.fade-in:nth-child(5) { animation-delay: 0.7s; }

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

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

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--header-h);
  background: var(--color-white);
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero__gradient {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.12;
}

.hero__gradient--1 {
  width: 700px;
  height: 700px;
  background: var(--color-primary);
  top: -200px;
  right: -200px;
}

.hero__gradient--2 {
  width: 500px;
  height: 500px;
  background: var(--color-accent);
  bottom: -100px;
  left: -100px;
  opacity: 0.08;
}

.hero__gradient--3 {
  width: 400px;
  height: 400px;
  background: #8B5CF6;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.05;
}

.hero__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 80px 0;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-primary-pale);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(30,64,175,0.15);
  margin-bottom: 24px;
}

.hero__badge .fab {
  font-size: 16px;
  color: #EF4444;
}

.hero__title {
  font-size: clamp(36px, 6vw, 68px);
  font-weight: 900;
  color: var(--color-black);
  line-height: 1.18;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}

.hero__title--accent {
  color: var(--color-primary);
  font-style: normal;
  position: relative;
}

.hero__title--accent::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 4px;
}

.hero__subtitle {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--color-gray-600);
  line-height: 1.75;
  max-width: 560px;
  margin: 0 auto 40px;
}

.hero__subtitle strong {
  color: var(--color-primary);
  font-weight: 700;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

/* Hero Stats */
.hero__stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 28px 40px;
  box-shadow: var(--shadow-md);
  max-width: 560px;
  margin: 0 auto;
}

.hero__stat {
  flex: 1;
  text-align: center;
}

.hero__stat-number {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.hero__stat-label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-gray-500);
  margin-top: 4px;
}

.hero__stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-gray-200);
  margin: 0 20px;
  flex-shrink: 0;
}

/* Scroll hint */
.hero__scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  animation: scrollBounce 2s ease-in-out infinite;
}

.hero__scroll-text {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--color-gray-400);
  font-weight: 600;
}

.hero__scroll-arrow {
  width: 1px;
  height: 32px;
  background: linear-gradient(to bottom, var(--color-gray-400), transparent);
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ===== PROBLEM ===== */
.problem {
  background: var(--color-white);
}

.problem__compare {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 8px;
}

.problem__vs {
  font-size: 20px;
  font-weight: 900;
  color: var(--color-gray-400);
  flex-shrink: 0;
  letter-spacing: 1px;
}

.problem__card {
  flex: 1;
  background: var(--color-white);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  position: relative;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.problem__card--bad {
  border-color: var(--color-gray-200);
  background: var(--color-gray-50);
}

.problem__card--good {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-blue);
}

.problem__card-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.problem__card-tag--bad {
  background: var(--color-gray-100);
  color: var(--color-gray-500);
}

.problem__card-tag--good {
  background: var(--color-primary-pale);
  color: var(--color-primary);
}

.problem__card-stats {
  margin-bottom: 24px;
}

.problem__big-num {
  display: block;
  font-size: 36px;
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1.1;
}

.problem__card--bad .problem__big-num {
  color: var(--color-gray-400);
}

.problem__card--good .problem__big-num {
  color: var(--color-primary);
}

.problem__big-label {
  font-size: 13px;
  color: var(--color-gray-500);
  font-weight: 500;
}

.problem__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.problem__list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--color-gray-600);
}

.problem__list li .fa-circle-xmark {
  color: var(--color-danger);
  font-size: 16px;
  flex-shrink: 0;
}

.problem__list--good li {
  color: var(--color-dark);
}

.problem__list--good li .fa-circle-check {
  color: var(--color-success);
  font-size: 16px;
  flex-shrink: 0;
}

.problem__caption {
  font-size: 14px;
  color: var(--color-gray-500);
  font-style: italic;
  border-top: 1px solid var(--color-gray-200);
  padding-top: 16px;
  margin-top: 4px;
}

.problem__chat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--color-primary-pale);
  padding-top: 16px;
  margin-top: 4px;
}

.problem__bubble {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-primary-pale);
  color: var(--color-primary-dark);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-lg);
  border-radius: 14px 14px 14px 4px;
  width: fit-content;
}

.problem__bubble .fas {
  color: var(--color-primary);
  font-size: 14px;
}

/* ===== PROCESS ===== */
.process__steps {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 8px;
}

.process__step {
  flex: 1;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  text-align: center;
  position: relative;
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
}

.process__step:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.process__step-num {
  position: absolute;
  top: 16px;
  left: 16px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-gray-400);
}

.process__step-icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary-pale);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--color-primary);
  font-size: 22px;
  transition: background var(--transition-base), color var(--transition-base);
}

.process__step:hover .process__step-icon {
  background: var(--color-primary);
  color: var(--color-white);
}

.process__step-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.process__step-desc {
  font-size: 13px;
  color: var(--color-gray-500);
  line-height: 1.65;
}

.process__arrow {
  display: flex;
  align-items: center;
  padding-top: 80px;
  color: var(--color-gray-300);
  font-size: 16px;
  flex-shrink: 0;
}

/* ===== SERVICES ===== */
.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.service__card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  position: relative;
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
  overflow: hidden;
}

.service__card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
  border-color: var(--color-primary);
}

.service__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition-base);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

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

.service__badge {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}

.service__icon {
  width: 52px;
  height: 52px;
  background: var(--color-primary-pale);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 20px;
  margin-bottom: 20px;
  transition: background var(--transition-base), color var(--transition-base);
}
.service__icon--2 { background: #F0FDF4; color: #16A34A; }
.service__icon--3 { background: #FFF7ED; color: #EA580C; }
.service__icon--4 { background: #F5F3FF; color: #7C3AED; }

.service__card:hover .service__icon { background: var(--color-primary); color: #fff; }
.service__card:hover .service__icon--2 { background: #16A34A; color: #fff; }
.service__card:hover .service__icon--3 { background: #EA580C; color: #fff; }
.service__card:hover .service__icon--4 { background: #7C3AED; color: #fff; }

.service__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.service__desc {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.7;
  margin-bottom: 20px;
}

.service__features {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.service__features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-gray-600);
}

.service__features li .fas {
  color: var(--color-success);
  font-size: 13px;
  flex-shrink: 0;
}

.service__cta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
  transition: gap var(--transition-base), border-color var(--transition-base);
  padding-bottom: 2px;
}

.service__cta:hover {
  gap: 8px;
  border-bottom-color: var(--color-primary);
  color: var(--color-primary);
}

/* ===== DIFFERENTIATORS ===== */
.diff__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

.diff__item {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.diff__icon {
  width: 52px;
  height: 52px;
  background: var(--color-primary-pale);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--color-primary);
  margin-bottom: 20px;
}
.diff__icon--2 { background: #F0FDF4; color: #16A34A; }
.diff__icon--3 { background: #FFF7ED; color: #EA580C; }
.diff__icon--4 { background: #FFFBEB; color: #D97706; }
.diff__icon--5 { background: #F5F3FF; color: #7C3AED; }
.diff__icon--6 { background: #F0F9FF; color: #0284C7; }

.diff__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 10px;
}

.diff__desc {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ===== STATS (PORTFOLIO) ===== */
.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 60px;
}

.stats__item {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 36px 24px;
  text-align: center;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.stats__num {
  display: block;
  font-size: 44px;
  font-weight: 900;
  color: var(--color-primary);
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 8px;
}

.stats__label {
  font-size: 14px;
  color: var(--color-gray-500);
  font-weight: 500;
}

/* Portfolio Cases */
.portfolio__cases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.portfolio__case {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.portfolio__case-category {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--color-primary);
  background: var(--color-primary-pale);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.portfolio__case-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.portfolio__case-result {
  font-size: 14px;
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: 20px;
}

.portfolio__case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.portfolio__case-tags span {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-gray-600);
  background: var(--color-gray-100);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

/* ===== FAQ ===== */
.faq__container {
  max-width: 780px;
}

.faq__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq__item {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.faq__item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.faq__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-dark);
  background: transparent;
  text-align: left;
  transition: color var(--transition-base), background var(--transition-base);
}

.faq__question:hover {
  color: var(--color-primary);
  background: var(--color-primary-pale);
}

.faq__question[aria-expanded="true"] {
  color: var(--color-primary);
  background: var(--color-primary-pale);
}

.faq__icon {
  font-size: 14px;
  transition: transform var(--transition-base);
  flex-shrink: 0;
  color: var(--color-gray-400);
}

.faq__question[aria-expanded="true"] .faq__icon {
  transform: rotate(45deg);
  color: var(--color-primary);
}

.faq__answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.faq__answer.open {
  padding: 8px 24px 22px;
  max-height: 400px;
}

.faq__answer p {
  font-size: 15px;
  color: var(--color-gray-600);
  line-height: 1.75;
  border-top: 1px solid var(--color-gray-200);
  padding-top: 16px;
}

/* ===== CONTACT ===== */
.contact {
  background: var(--color-white);
}

.contact__container {
  max-width: 1000px;
}

.contact__layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 48px;
  align-items: start;
}

/* Contact Info */
.contact__info-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 28px;
}

.contact__info-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 28px;
}

.contact__info-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.contact__info-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-pale);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 16px;
  flex-shrink: 0;
}

.contact__info-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-gray-400);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.contact__info-value {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-dark);
  transition: color var(--transition-base);
}

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

.contact__notice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--color-primary-pale);
  border: 1px solid rgba(30,64,175,0.12);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  color: var(--color-primary-dark);
  font-size: 14px;
  line-height: 1.6;
}

.contact__notice .fas {
  color: var(--color-primary);
  font-size: 16px;
  flex-shrink: 0;
  margin-top: 2px;
}

.contact__notice strong {
  font-weight: 700;
}

/* Contact Form */
.contact__form-wrap {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form__label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-dark);
}

.form__required {
  color: var(--color-danger);
}

.form__input {
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--color-dark);
  background: var(--color-gray-50);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 13px 16px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  outline: none;
  width: 100%;
}

.form__input:focus {
  border-color: var(--color-primary);
  background: var(--color-white);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form__input.error {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form__input::placeholder {
  color: var(--color-gray-400);
}

.form__select {
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

.form__textarea {
  resize: vertical;
  min-height: 100px;
}

.form__error {
  font-size: 12px;
  color: var(--color-danger);
  font-weight: 500;
  min-height: 18px;
}

.form__hint {
  font-size: 12px;
  color: var(--color-gray-400);
}

.form__group--check {
  gap: 6px;
}

.form__check-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--color-gray-600);
  cursor: pointer;
}

.form__check-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1.5px solid var(--color-gray-300);
  cursor: pointer;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

.form__link {
  color: var(--color-primary);
  text-decoration: underline;
  font-weight: 600;
}

/* Success */
.contact__success {
  text-align: center;
  padding: 48px 24px;
}

.contact__success[hidden] {
  display: none;
}

.contact__success-icon {
  font-size: 56px;
  color: var(--color-success);
  margin-bottom: 20px;
}

.contact__success h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.contact__success p {
  font-size: 16px;
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-black);
  color: rgba(255,255,255,0.65);
}

.footer__inner {
  padding-top: 64px;
  padding-bottom: 36px;
}

.footer__top {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 64px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 32px;
}

.footer__tagline {
  font-size: 14px;
  line-height: 1.65;
  margin: 16px 0 20px;
  color: rgba(255,255,255,0.45);
}

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer__contact-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: rgba(255,255,255,0.55);
  transition: color var(--transition-base);
}

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

.footer__contact-link .fas {
  width: 16px;
  color: var(--color-primary-light);
}

.footer__nav {
  display: flex;
  gap: 48px;
}

.footer__nav-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.85);
  margin-bottom: 16px;
}

.footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__nav a {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  transition: color var(--transition-base);
}

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

.footer__bottom {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__biz p {
  font-size: 12px;
  line-height: 1.7;
  color: rgba(255,255,255,0.3);
}

.footer__legal {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.footer__legal span {
  color: rgba(255,255,255,0.2);
  font-size: 12px;
}

.footer__legal-link {
  font-size: 12px;
  color: rgba(255,255,255,0.45);
  transition: color var(--transition-base);
}

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

.footer__copy {
  font-size: 12px;
  color: rgba(255,255,255,0.25);
}

/* ===== BACK TO TOP ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 24px;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-blue);
  z-index: 800;
  transition: transform var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base);
  opacity: 0;
  pointer-events: none;
  font-size: 16px;
}

.back-to-top:not([hidden]) {
  opacity: 1;
  pointer-events: all;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(30,64,175,0.4);
}

/* ===== RESPONSIVE ===== */

/* Tablet */
@media (max-width: 1024px) {
  .process__steps {
    flex-wrap: wrap;
  }
  .process__step {
    min-width: 180px;
  }
  .process__arrow {
    display: none;
  }
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .portfolio__cases {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  :root { --container-pad: 20px; }
  .section { padding: 72px 0; }
  .section__header { margin-bottom: 48px; }
  .contact__layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .footer__top {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer__nav {
    gap: 32px;
  }
}

/* Mobile */
@media (max-width: 767px) {
  :root {
    --header-h: 64px;
    --container-pad: 16px;
  }
  .section { padding: 56px 0; }
  .section__header { margin-bottom: 36px; }

  .pc-only { display: none; }

  /* Hero */
  .hero__actions {
    flex-direction: column;
    gap: 12px;
  }
  .hero__actions .btn {
    width: 100%;
    justify-content: center;
  }
  .hero__stats {
    padding: 20px 16px;
  }
  .hero__stat-number { font-size: 22px; }
  .hero__stat-divider { margin: 0 12px; }

  /* Problem */
  .problem__compare {
    flex-direction: column;
    gap: 16px;
  }
  .problem__vs { align-self: center; }
  .problem__card { width: 100%; }

  /* Process */
  .process__steps {
    flex-direction: column;
  }
  .process__step { width: 100%; }

  /* Services */
  .services__grid {
    grid-template-columns: 1fr;
  }

  /* Diff */
  .diff__grid {
    grid-template-columns: 1fr;
  }

  /* Stats */
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .stats__num { font-size: 32px; }

  /* Portfolio cases */
  .portfolio__cases {
    grid-template-columns: 1fr;
  }

  /* Contact form */
  .contact__form-wrap {
    padding: 24px 20px;
  }

  /* Footer */
  .footer__nav {
    flex-wrap: wrap;
    gap: 24px;
  }

  /* Back to top */
  .back-to-top {
    bottom: 24px;
    right: 16px;
  }
}

@media (max-width: 400px) {
  .hero__stats {
    flex-direction: column;
    gap: 16px;
    padding: 24px 20px;
  }
  .hero__stat-divider {
    width: 40px;
    height: 1px;
    margin: 0;
  }
  .stats__grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== PRINT ===== */
@media print {
  .header, .back-to-top, .hero__scroll-hint { display: none; }
  .section { padding: 40px 0; }
}

/* ===== HIGH CONTRAST / A11Y ===== */
@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; }
}

@media (prefers-color-scheme: dark) {
  /* 선택적 다크 모드 - 필요시 확장 */
}