/* =====================================================
   KAICORE — AI 기반 호텔 성장 솔루션
   v2.0 — Dark Navy + Electric Blue Tech Design
   ===================================================== */

/* ─────────────────────────────────────────
   CSS VARIABLES
───────────────────────────────────────── */
:root {
  /* Core palette */
  --c-bg:         #04071a;        /* deep space navy */
  --c-bg-2:       #070c24;        /* section alt */
  --c-bg-3:       #0a1230;        /* card bg */
  --c-surface:    #0d1635;        /* elevated surface */
  --c-surface-2:  #111d42;        /* border highlight */

  --c-white:      #ffffff;
  --c-white-80:   rgba(255,255,255,0.80);
  --c-white-60:   rgba(255,255,255,0.60);
  --c-white-40:   rgba(255,255,255,0.40);
  --c-white-15:   rgba(255,255,255,0.15);
  --c-white-08:   rgba(255,255,255,0.08);
  --c-white-04:   rgba(255,255,255,0.04);

  /* Electric Blue */
  --c-blue:       #2563ff;
  --c-blue-bright:#3d7eff;
  --c-blue-glow:  #1e52cc;
  --c-blue-neon:  #60a5fa;
  --c-blue-dim:   rgba(37, 99, 255, 0.18);
  --c-blue-border:rgba(37, 99, 255, 0.35);

  /* Accent colours for metric cards */
  --c-indigo:     #6366f1;
  --c-cyan:       #06b6d4;
  --c-emerald:    #10b981;
  --c-amber:      #f59e0b;
  --c-rose:       #f43f5e;
  --c-violet:     #8b5cf6;

  /* Typography */
  --f-sans: 'Noto Sans KR', 'Inter', system-ui, sans-serif;
  --f-mono: 'Inter', 'Courier New', monospace;

  /* Spacing */
  --s-section: clamp(100px, 12vw, 140px);
  --container: 1200px;
  --pad: clamp(1.25rem, 5vw, 2.5rem);
  --nav-h: 72px;

  /* Effects */
  --radius-sm:   8px;
  --radius-md:   14px;
  --radius-lg:   22px;
  --radius-xl:   32px;
  --radius-pill: 9999px;

  --glow-blue: 0 0 40px rgba(37,99,255,0.25), 0 0 80px rgba(37,99,255,0.10);
  --glow-sm:   0 0 20px rgba(37,99,255,0.20);

  --shadow-card: 0 4px 32px rgba(0,0,0,0.4), 0 1px 8px rgba(0,0,0,0.3);
  --shadow-float:0 20px 60px rgba(0,0,0,0.5);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --t: all 0.3s var(--ease);
  --t-fast: all 0.15s var(--ease);
  --t-slow: all 0.5s var(--ease);
}

/* ─────────────────────────────────────────
   RESET
───────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--f-sans);
  background: var(--c-bg);
  color: var(--c-white-80);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ─────────────────────────────────────────
   LAYOUT UTILITIES
───────────────────────────────────────── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad);
}

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

/* ─────────────────────────────────────────
   TYPOGRAPHY SYSTEM
───────────────────────────────────────── */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-blue-neon);
  margin-bottom: 1.25rem;
}
.section-label::before {
  content: '';
  width: 24px;
  height: 1.5px;
  background: var(--c-blue-neon);
  opacity: 0.8;
}

.section-title {
  font-size: clamp(2.2rem, 4.5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--c-white);
  margin-bottom: 1.25rem;
}

.section-title .highlight,
.highlight { color: var(--c-blue-neon); }

.section-desc {
  font-size: 1.0625rem;
  color: var(--c-white-60);
  max-width: 560px;
  margin-bottom: clamp(3rem, 5vw, 4rem);
  line-height: 1.8;
}

/* ─────────────────────────────────────────
   REVEAL ANIMATIONS
───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal-left.visible { opacity: 1; transform: translateX(0); }
.reveal-right {
  opacity: 0;
  transform: translateX(32px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal-right.visible { opacity: 1; transform: translateX(0); }

/* ─────────────────────────────────────────
   BUTTONS
───────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0.875rem 2rem;
  font-size: 0.9375rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  transition: var(--t);
  cursor: pointer;
  white-space: nowrap;
  font-family: var(--f-sans);
  letter-spacing: 0.01em;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: var(--c-blue);
  color: var(--c-white);
  border: 1.5px solid var(--c-blue);
  box-shadow: var(--glow-sm);
}
.btn--primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
  border-radius: inherit;
}
.btn--primary:hover {
  background: var(--c-blue-bright);
  border-color: var(--c-blue-bright);
  box-shadow: var(--glow-blue);
  transform: translateY(-2px);
}
.btn--primary:hover::before { opacity: 1; }

.btn--ghost {
  background: var(--c-white-08);
  color: var(--c-white-80);
  border: 1.5px solid var(--c-white-15);
  backdrop-filter: blur(12px);
}
.btn--ghost:hover {
  background: var(--c-white-15);
  border-color: var(--c-white-40);
  color: var(--c-white);
  transform: translateY(-2px);
}
.btn--full { width: 100%; }

/* ─────────────────────────────────────────
   HEADER / NAV
───────────────────────────────────────── */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: transparent;
  transition: var(--t);
}
.header.scrolled {
  background: rgba(4, 7, 26, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--c-white-08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  font-family: var(--f-mono);
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
}
.nav__logo-img {
  height: 32px;
  width: auto;
  display: block;
  transition: opacity 0.2s ease;
}
.nav__logo:hover .nav__logo-img {
  opacity: 0.85;
}
.logo-kai  { color: var(--c-blue-bright); }
.logo-core { color: var(--c-white); }

/* Hero 우측 상단 로고 뱃지 */
.hero__logo-badge {
  position: absolute;
  top: 2.5rem;
  right: 2.5rem;
  z-index: 10;
}
.hero__logo-img {
  height: 40px;
  width: auto;
  display: block;
  opacity: 0.9;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 0.125rem;
}

.nav__link {
  padding: 0.5rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-white-60);
  border-radius: var(--radius-pill);
  transition: var(--t-fast);
}
.nav__link:hover, .nav__link.active {
  color: var(--c-white);
  background: var(--c-white-08);
}
.nav__link--cta {
  background: var(--c-blue);
  color: var(--c-white) !important;
  padding: 0.5rem 1.25rem;
  margin-left: 0.625rem;
  box-shadow: var(--glow-sm);
}
.nav__link--cta:hover {
  background: var(--c-blue-bright) !important;
  box-shadow: var(--glow-blue);
  transform: translateY(-1px);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  border-radius: var(--radius-sm);
}
.nav__toggle span {
  width: 24px; height: 2px;
  background: var(--c-white-80);
  border-radius: 2px;
  display: block;
  transition: var(--t-fast);
}
.nav__toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.active span:nth-child(2) { opacity: 0; }
.nav__toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }


/* ─────────────────────────────────────────
   HERO SECTION
───────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--c-bg);
}

/* Canvas bg */
#heroCanvas {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}

/* Radial glow blobs */
.hero__glow-1 {
  position: absolute;
  top: -15%;  left: -10%;
  width: 70vw; height: 70vw;
  max-width: 900px; max-height: 900px;
  background: radial-gradient(circle, rgba(37,99,255,0.12) 0%, transparent 65%);
  pointer-events: none;
  border-radius: 50%;
  animation: glowDrift1 12s ease-in-out infinite alternate;
}
.hero__glow-2 {
  position: absolute;
  bottom: -20%; right: -10%;
  width: 60vw; height: 60vw;
  max-width: 800px; max-height: 800px;
  background: radial-gradient(circle, rgba(99,102,241,0.09) 0%, transparent 65%);
  pointer-events: none;
  border-radius: 50%;
  animation: glowDrift2 15s ease-in-out infinite alternate;
}

@keyframes glowDrift1 {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(4%, 6%) scale(1.05); }
}
@keyframes glowDrift2 {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(-4%, -4%) scale(1.08); }
}

.hero__content {
  position: relative;
  z-index: 2;
  padding-top: calc(var(--nav-h) + clamp(60px, 8vw, 80px));
  padding-bottom: clamp(80px, 10vw, 100px);
  max-width: 860px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 0.4rem 1rem;
  background: rgba(37,99,255,0.12);
  border: 1px solid var(--c-blue-border);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-blue-neon);
  letter-spacing: 0.03em;
  margin-bottom: 2rem;
  backdrop-filter: blur(12px);
}
.badge-dot {
  width: 7px; height: 7px;
  background: var(--c-blue-neon);
  border-radius: 50%;
  animation: dotPulse 2.5s ease-in-out infinite;
  box-shadow: 0 0 8px var(--c-blue-neon);
}
@keyframes dotPulse {
  0%, 100% { transform: scale(1); opacity: 1; box-shadow: 0 0 8px var(--c-blue-neon); }
  50% { transform: scale(0.75); opacity: 0.6; box-shadow: 0 0 3px var(--c-blue-neon); }
}

.hero__headline {
  font-size: clamp(2.6rem, 6.5vw, 5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: var(--c-white);
  margin-bottom: 1.75rem;
}
.hero__headline .line-accent {
  display: block;
  background: linear-gradient(90deg, var(--c-blue-neon), var(--c-blue-bright), #a5b4fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subhead {
  font-size: clamp(1rem, 2vw, 1.175rem);
  color: var(--c-white-60);
  line-height: 1.85;
  margin-bottom: 2.5rem;
  max-width: 560px;
}
.hero__subhead strong {
  color: var(--c-white-80);
  font-weight: 600;
}

.hero__cta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 4rem;
}

/* Metric tag row */
.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.hero__tag {
  padding: 0.35rem 0.9rem;
  background: var(--c-white-04);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--c-white-40);
  transition: var(--t-fast);
}
.hero__tag:hover {
  background: var(--c-blue-dim);
  border-color: var(--c-blue-border);
  color: var(--c-blue-neon);
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 2.25rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  opacity: 0.4;
}
.hero__scroll span {
  width: 1px; height: 52px;
  background: linear-gradient(to bottom, var(--c-blue-neon), transparent);
  display: block;
  animation: scrollDown 2.2s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { transform: scaleY(0); transform-origin: top; }
  45% { transform: scaleY(1); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}


/* ─────────────────────────────────────────
   ABOUT SECTION
───────────────────────────────────────── */
.about { background: var(--c-bg-2); }

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

/* Left: problem items */
.about__left {}
.about__eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-white-40);
  margin-bottom: 1.5rem;
}

.problem-list {
  display: flex;
  flex-direction: column;
  gap: 1.125rem;
  margin-top: 2.5rem;
}

.problem-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem 1.25rem;
  background: var(--c-white-04);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-md);
  transition: var(--t);
  cursor: default;
}
.problem-item:hover {
  background: rgba(37,99,255,0.07);
  border-color: var(--c-blue-border);
  transform: translateX(5px);
}
.problem-icon {
  flex-shrink: 0;
  width: 38px; height: 38px;
  background: var(--c-blue-dim);
  border: 1px solid var(--c-blue-border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  padding: 8px;
}
.problem-icon svg { width: 100%; height: 100%; color: var(--c-blue-neon); }
.problem-item strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--c-white-80);
  margin-bottom: 0.2rem;
}
.problem-item p { font-size: 0.84rem; color: var(--c-white-40); line-height: 1.65; }

/* Right: diagram */
.about__right { position: relative; }

.paradigm-diagram {
  background: var(--c-surface);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
}
.paradigm-diagram::before {
  content: '';
  position: absolute;
  top: -80px; right: -80px;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(37,99,255,0.1) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 50%;
}

.diagram-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-white-40);
  margin-bottom: 2rem;
  font-family: var(--f-mono);
}

/* SEO → AEO Flow */
.seo-aeo-flow {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.flow-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.flow-node {
  flex: 1;
  padding: 0.875rem 1rem;
  border-radius: var(--radius-md);
  text-align: center;
}
.flow-node.old {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
}
.flow-node.new {
  background: var(--c-blue-dim);
  border: 1px solid var(--c-blue-border);
  box-shadow: var(--glow-sm);
}
.flow-node .node-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
  display: block;
}
.flow-node.old .node-label { color: var(--c-white-40); }
.flow-node.new .node-label { color: var(--c-blue-neon); }
.flow-node .node-value {
  font-size: 1.0rem;
  font-weight: 800;
  color: var(--c-white);
  letter-spacing: -0.02em;
}

.flow-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  flex-shrink: 0;
}
.flow-arrow svg {
  width: 20px; height: 20px;
  color: var(--c-blue-neon);
  opacity: 0.8;
}

.flow-desc {
  font-size: 0.78rem;
  color: var(--c-white-40);
  line-height: 1.6;
  padding-top: 0.25rem;
  border-top: 1px solid var(--c-white-08);
}

/* Zero-click stat */
.zeroclik-stat {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}
.zc-item {
  background: var(--c-white-04);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
}
.zc-item.accent {
  background: var(--c-blue-dim);
  border-color: var(--c-blue-border);
}
.zc-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--c-white);
  letter-spacing: -0.04em;
  font-family: var(--f-mono);
  display: block;
  line-height: 1;
  margin-bottom: 0.25rem;
}
.zc-item.accent .zc-num { color: var(--c-blue-neon); }
.zc-label {
  font-size: 0.75rem;
  color: var(--c-white-40);
  line-height: 1.4;
}

/* About answer block */
.about__answer-block {
  margin-top: 2.5rem;
  padding: 1.5rem;
  background: var(--c-blue-dim);
  border: 1px solid var(--c-blue-border);
  border-radius: var(--radius-lg);
}
.about__answer-block p {
  font-size: 1.0rem;
  font-weight: 600;
  color: var(--c-white-80);
  line-height: 1.7;
  margin-bottom: 1rem;
}
.about__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.about__tags span {
  padding: 0.25rem 0.7rem;
  background: var(--c-white-08);
  border: 1px solid var(--c-white-15);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--c-blue-neon);
}

/* ─────────────────────────────────────────
   SOLUTION SECTION
───────────────────────────────────────── */
.solution { background: var(--c-bg); }

.solution__headline-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: clamp(3rem, 5vw, 4.5rem);
  flex-wrap: wrap;
}
.solution__quote {
  max-width: 420px;
  padding: 1.5rem 1.75rem;
  background: var(--c-white-04);
  border-left: 3px solid var(--c-blue);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.solution__quote p {
  font-size: 1.0rem;
  font-weight: 600;
  color: var(--c-white-80);
  line-height: 1.7;
}
.solution__quote .q-accent { color: var(--c-blue-neon); }

.solution__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.solution-card {
  position: relative;
  padding: 2rem;
  background: var(--c-surface);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-lg);
  transition: var(--t);
  overflow: hidden;
}
.solution-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-blue), var(--c-indigo));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.solution-card:hover {
  background: var(--c-surface-2);
  border-color: var(--c-blue-border);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}
.solution-card:hover::after { transform: scaleX(1); }

.sol-num {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-white-15);
  margin-bottom: 1.25rem;
}

.solution-card__icon {
  width: 46px; height: 46px;
  background: var(--c-blue-dim);
  border: 1px solid var(--c-blue-border);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  padding: 10px;
  margin-bottom: 1.25rem;
  transition: var(--t);
}
.solution-card__icon svg { width: 100%; height: 100%; color: var(--c-blue-neon); }
.solution-card:hover .solution-card__icon {
  background: rgba(37,99,255,0.25);
  box-shadow: var(--glow-sm);
}

.solution-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}
.solution-card p {
  font-size: 0.855rem;
  color: var(--c-white-40);
  line-height: 1.75;
}

/* ─────────────────────────────────────────
   6 METRICS — GLASSMORPHISM
───────────────────────────────────────── */
.metrics { background: var(--c-bg-2); }

/* Tab selector */
.metrics__tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}
.metrics__tab {
  padding: 0.5rem 1.125rem;
  font-size: 0.84rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  background: var(--c-white-04);
  border: 1px solid var(--c-white-08);
  color: var(--c-white-40);
  cursor: pointer;
  transition: var(--t-fast);
}
.metrics__tab:hover { color: var(--c-white-80); border-color: var(--c-white-15); }
.metrics__tab.active {
  background: var(--c-blue);
  border-color: var(--c-blue);
  color: var(--c-white);
  box-shadow: var(--glow-sm);
}

.metrics__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.metric-card {
  position: relative;
  padding: 2rem;
  background: rgba(13, 22, 53, 0.65);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
  cursor: default;
}
.metric-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-white-15), transparent);
}

.metric-card:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: 0 24px 60px rgba(0,0,0,0.5);
}

.metric-card.mc--blue:hover   { border-color: rgba(37,99,255,0.5);  box-shadow: 0 24px 60px rgba(37,99,255,0.15); }
.metric-card.mc--indigo:hover { border-color: rgba(99,102,241,0.5); box-shadow: 0 24px 60px rgba(99,102,241,0.15); }
.metric-card.mc--emerald:hover{ border-color: rgba(16,185,129,0.5); box-shadow: 0 24px 60px rgba(16,185,129,0.12); }
.metric-card.mc--amber:hover  { border-color: rgba(245,158,11,0.5); box-shadow: 0 24px 60px rgba(245,158,11,0.12); }
.metric-card.mc--rose:hover   { border-color: rgba(244,63,94,0.5);  box-shadow: 0 24px 60px rgba(244,63,94,0.12); }
.metric-card.mc--violet:hover { border-color: rgba(139,92,246,0.5); box-shadow: 0 24px 60px rgba(139,92,246,0.12); }

/* Card glow accent */
.metric-card::after {
  content: '';
  position: absolute;
  bottom: -40px; right: -40px;
  width: 120px; height: 120px;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0.15;
  transition: opacity 0.3s;
}
.metric-card:hover::after { opacity: 0.25; }
.mc--blue::after   { background: var(--c-blue); }
.mc--indigo::after { background: var(--c-indigo); }
.mc--emerald::after{ background: var(--c-emerald); }
.mc--amber::after  { background: var(--c-amber); }
.mc--rose::after   { background: var(--c-rose); }
.mc--violet::after { background: var(--c-violet); }

.mc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.mc-icon {
  width: 42px; height: 42px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  padding: 9px;
}
.mc-icon svg { width: 100%; height: 100%; }

.mc--blue .mc-icon   { background: rgba(37,99,255,0.15);  color: #60a5fa; }
.mc--indigo .mc-icon { background: rgba(99,102,241,0.15); color: #a5b4fc; }
.mc--emerald .mc-icon{ background: rgba(16,185,129,0.15); color: #6ee7b7; }
.mc--amber .mc-icon  { background: rgba(245,158,11,0.15); color: #fcd34d; }
.mc--rose .mc-icon   { background: rgba(244,63,94,0.15);  color: #fda4af; }
.mc--violet .mc-icon { background: rgba(139,92,246,0.15); color: #c4b5fd; }

.mc-idx {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-white-15);
}

.metric-card h3 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--c-white);
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.mc-body { display: flex; flex-direction: column; gap: 0.875rem; }

.mc-section {}
.mc-tag {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
  margin-bottom: 0.3rem;
}
.mc-tag.problem  { background: rgba(244,63,94,0.12);  color: #fda4af; }
.mc-tag.approach { background: rgba(37,99,255,0.12);  color: #93c5fd; }
.mc-tag.effect   { background: rgba(16,185,129,0.12); color: #6ee7b7; }

.mc-section p {
  font-size: 0.83rem;
  color: var(--c-white-40);
  line-height: 1.7;
}

/* ─────────────────────────────────────────
   CASE SECTION
───────────────────────────────────────── */
.case { background: var(--c-bg); }

.case__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.case__left {
  display: flex;
  flex-direction: column;
}
.case__left .btn {
  margin-top: 2.5rem;
  align-self: flex-start;
}
.case__number-block {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  margin: 2rem 0 1.5rem;
}
.case__big-num {
  font-size: 5rem;
  font-weight: 900;
  line-height: 1;
  color: var(--c-white);
  font-family: var(--f-mono);
  letter-spacing: -0.05em;
}
.case__big-num span { color: var(--c-blue-neon); }
.case__num-label {
  font-size: 0.9rem;
  color: var(--c-white-60);
  padding-bottom: 0.5rem;
  line-height: 1.4;
}
.case__desc {
  font-size: 1rem;
  color: var(--c-white-60);
  line-height: 1.8;
  margin-bottom: 2rem;
  max-width: 440px;
}

.case__principles {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2.5rem;
}
.case-principle {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--c-white-04);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-md);
  transition: var(--t);
}
.case-principle:hover {
  background: var(--c-blue-dim);
  border-color: var(--c-blue-border);
}
.case-principle__icon {
  width: 38px; height: 38px;
  flex-shrink: 0;
  background: var(--c-blue-dim);
  border: 1px solid var(--c-blue-border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  padding: 8px;
  color: var(--c-blue-neon);
}
.case-principle__icon svg { width: 100%; height: 100%; }
.case-principle h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--c-white-80);
  margin-bottom: 0.2rem;
}
.case-principle p { font-size: 0.83rem; color: var(--c-white-40); line-height: 1.6; }

/* ─── About 6 Metrics Grid ─── */
.about-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.875rem;
}
.about-metric-item {
  background: var(--c-white-04);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-md);
  padding: 1.125rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: var(--t);
}
.about-metric-item:hover {
  background: rgba(37,99,255,0.07);
  border-color: var(--c-blue-border);
  transform: translateY(-3px);
}
.about-metric-item.accent {
  background: var(--c-blue-dim);
  border-color: var(--c-blue-border);
}
.about-metric-icon {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-blue-neon);
  margin-bottom: 0.25rem;
}
.about-metric-icon svg { width: 18px; height: 18px; }
.about-metric-item strong {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--c-white);
}
.about-metric-item p {
  font-size: 0.75rem;
  color: var(--c-white-40);
  line-height: 1.5;
}

/* ─── Partner Hotel Logos ─── */
.partner-logos {
  margin-top: 2rem;
  margin-bottom: 2.5rem;
  opacity: 1 !important;
  transform: none !important;
}
.partner-logos__label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-white-40);
  margin-bottom: 1rem;
  font-family: var(--f-mono);
}
.partner-logos__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.partner-logo-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 1.25rem 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--t);
  cursor: default;
  min-height: 80px;
}
.partner-logo-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}
/* 실제 로고 이미지 스타일 */
.partner-logo-img {
  display: block;
  max-width: 100%;
  max-height: 52px;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: brightness(0) invert(1);
  opacity: 0.75;
  transition: opacity 0.3s ease, filter 0.3s ease;
}
/* Hyatt Place - 검은 배경이라 반전 필요 */
.partner-logo-img--dark {
  filter: brightness(0) invert(1);
  opacity: 0.75;
}
.partner-logo-card:hover .partner-logo-img {
  opacity: 1;
  filter: brightness(0) invert(1) drop-shadow(0 0 6px rgba(37,99,255,0.5));
}
/* SVG 인라인 로고 */
.partner-logo-svg {
  width: 100%;
  max-width: 130px;
  height: 52px;
  display: block;
  transition: opacity 0.3s ease;
  opacity: 0.8;
}
.partner-logo-card:hover .partner-logo-svg {
  opacity: 1;
  filter: drop-shadow(0 0 6px rgba(37,99,255,0.4));
}
/* 파트너 로고 섹션은 reveal 애니메이션 없이 항상 표시 */
.partner-logos .partner-logo-card {
  opacity: 1 !important;
  transform: none !important;
}
/* 이미지 로드 실패 시 텍스트 fallback */
.logo-text-fallback {
  font-size: 0.72rem;
  font-weight: 700;
  color: rgba(255,255,255,0.6);
  text-align: center;
  letter-spacing: 0.05em;
  line-height: 1.4;
  font-family: var(--f-sans);
}

/* Right: visual */
.case__right {}

.trust-block {
  background: var(--c-surface);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
}
.trust-block::before {
  content: '';
  position: absolute;
  top: -60px; left: -60px;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(37,99,255,0.12) 0%, transparent 70%);
  pointer-events: none; border-radius: 50%;
}

.trust-quote {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.65;
  margin-bottom: 1.75rem;
  position: relative;
  padding-left: 1.25rem;
  border-left: 3px solid var(--c-blue-neon);
}

.trust-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}
.trust-stat {
  text-align: center;
  padding: 1.25rem 0.75rem;
  background: var(--c-white-04);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-md);
  transition: var(--t-fast);
}
.trust-stat:hover {
  background: var(--c-blue-dim);
  border-color: var(--c-blue-border);
}
.trust-stat__num {
  display: block;
  font-size: 2rem;
  font-weight: 900;
  color: var(--c-white);
  font-family: var(--f-mono);
  letter-spacing: -0.04em;
  margin-bottom: 0.25rem;
  line-height: 1;
}
.trust-stat:nth-child(1) .trust-stat__num { color: var(--c-blue-neon); }
.trust-stat:nth-child(2) .trust-stat__num { color: #a5b4fc; }
.trust-stat:nth-child(3) .trust-stat__num { color: var(--c-cyan, #06b6d4); }

.trust-stat__label {
  font-size: 0.75rem;
  color: var(--c-white-40);
  line-height: 1.4;
}

.trust-note {
  font-size: 0.84rem;
  color: var(--c-white-40);
  line-height: 1.7;
}
.trust-note strong { color: var(--c-white-60); }

/* ─────────────────────────────────────────
   CONTACT SECTION
───────────────────────────────────────── */
.contact { background: var(--c-bg-2); }

.contact__wrapper {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 3.5rem;
  align-items: start;
}

/* Left info */
.contact__info-panel {}
.contact__headline {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--c-white);
  margin-bottom: 1rem;
}
.contact__sub {
  font-size: 1rem;
  color: var(--c-white-60);
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.process-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}
.process-steps::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--c-blue), transparent);
  opacity: 0.3;
}
.step {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0 1rem 0;
  position: relative;
}
.step__num {
  width: 32px; height: 32px;
  background: var(--c-blue);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--c-white);
  flex-shrink: 0;
  font-family: var(--f-mono);
  position: relative;
  z-index: 1;
  box-shadow: 0 0 0 4px var(--c-bg-2);
}
.step__content strong {
  display: block;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-white-80);
  margin-bottom: 0.2rem;
}
.step__content p {
  font-size: 0.83rem;
  color: var(--c-white-40);
  line-height: 1.65;
}

.contact__info-footer {
  margin-top: 2rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--c-white-08);
}
.contact__info-footer p {
  font-size: 0.875rem;
  color: var(--c-white-40);
  line-height: 2.1;
}
.contact__info-footer strong {
  color: var(--c-white-60);
  font-weight: 600;
  margin-right: 0.5rem;
}

/* Right form */
.contact__form-panel {
  background: var(--c-surface);
  border: 1px solid var(--c-white-08);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
}

.form { display: flex; flex-direction: column; gap: 1.25rem; }
.form__group { display: flex; flex-direction: column; gap: 0.5rem; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.form__group label {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--c-white-60);
}
.required { color: var(--c-rose); }

.form__group input,
.form__group textarea {
  padding: 0.875rem 1rem;
  background: var(--c-white-04);
  border: 1.5px solid var(--c-white-08);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  color: var(--c-white-80);
  outline: none;
  resize: vertical;
  transition: var(--t-fast);
  -webkit-appearance: none;
}
.form__group input:focus,
.form__group textarea:focus {
  background: rgba(37,99,255,0.05);
  border-color: var(--c-blue-border);
  box-shadow: 0 0 0 3px rgba(37,99,255,0.12);
}
.form__group input::placeholder,
.form__group textarea::placeholder { color: var(--c-white-15); }
.form__group input.error,
.form__group textarea.error { border-color: rgba(244,63,94,0.6); }

.form__error { font-size: 0.8rem; color: #fda4af; display: none; }
.form__error.visible { display: block; }

.form__success {
  display: none;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: rgba(16,185,129,0.1);
  border: 1px solid rgba(16,185,129,0.25);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  color: #6ee7b7;
}
.form__success.visible { display: flex; }
.form__success svg { flex-shrink: 0; }

/* Loading spinner */
.btn__spinner {
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,0.2);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
  display: none;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─────────────────────────────────────────
   FOOTER
───────────────────────────────────────── */
.footer {
  background: var(--c-bg);
  border-top: 1px solid var(--c-white-08);
  padding: 4rem 0 2.5rem;
}

.footer__top {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--c-white-08);
  margin-bottom: 2rem;
}

.footer__brand {}
.footer__brand .nav__logo { font-size: 1.5rem; margin-bottom: 0.875rem; display: inline-flex; }
.footer__brand .logo-kai  { color: var(--c-blue-bright); }
.footer__brand .logo-core { color: var(--c-white); }
.footer__logo-img { height: 28px; margin-bottom: 0.25rem; }
.footer__brand p { font-size: 0.875rem; color: var(--c-white-40); line-height: 1.75; }

.footer__links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.footer__col h4 {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-white-40);
  margin-bottom: 1rem;
}
.footer__col ul { display: flex; flex-direction: column; gap: 0.5rem; }
.footer__col ul li,
.footer__col ul li a { font-size: 0.875rem; color: var(--c-white-40); transition: var(--t-fast); }
.footer__col ul li a:hover { color: var(--c-white); }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer__bottom p { font-size: 0.8125rem; color: var(--c-white-15); }
.footer__tagline { font-size: 0.75rem !important; letter-spacing: 0.08em; text-transform: uppercase; }

/* ─────────────────────────────────────────
   SCROLL-TO-TOP
───────────────────────────────────────── */
.scroll-top {
  position: fixed;
  bottom: 2rem; right: 2rem;
  width: 44px; height: 44px;
  background: var(--c-surface);
  border: 1px solid var(--c-white-15);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-white-60);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  opacity: 0;
  transform: translateY(14px);
  transition: var(--t);
  z-index: 99;
}
.scroll-top.visible { opacity: 1; transform: translateY(0); }
.scroll-top:hover {
  background: var(--c-blue);
  border-color: var(--c-blue);
  color: var(--c-white);
  box-shadow: var(--glow-sm);
  transform: translateY(-2px);
}

/* ─────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────── */
@media (max-width: 1024px) {
  .solution__grid,
  .metrics__grid { grid-template-columns: repeat(2, 1fr); }

  .about__grid,
  .case__inner   { grid-template-columns: 1fr; gap: 3rem; }

  .contact__wrapper { grid-template-columns: 1fr; gap: 2.5rem; }
  .footer__top { grid-template-columns: 1fr; gap: 2.5rem; }

  .solution__headline-row { flex-direction: column; align-items: flex-start; }
  .about-metrics-grid { grid-template-columns: repeat(3, 1fr); }
  .partner-logos__grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  :root { --nav-h: 64px; }

  .nav__menu {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: rgba(4,7,26,0.97);
    backdrop-filter: blur(24px);
    flex-direction: column;
    align-items: stretch;
    gap: 0; padding: 1rem;
    border-bottom: 1px solid var(--c-white-08);
    transform: translateY(-12px);
    opacity: 0; pointer-events: none;
    transition: var(--t);
    z-index: 999;
  }
  .nav__menu.open { transform: translateY(0); opacity: 1; pointer-events: all; }
  .nav__link { padding: 0.875rem 1rem; border-radius: var(--radius-md); font-size: 1rem; }
  .nav__link--cta { margin-left: 0; margin-top: 0.5rem; text-align: center; }
  .nav__toggle { display: flex; }

  .hero__cta { flex-direction: column; align-items: flex-start; }
  .hero__cta .btn { width: 100%; justify-content: center; }

  .solution__grid,
  .metrics__grid { grid-template-columns: 1fr; }

  .case__principles { gap: 0.875rem; }
  .trust-stats { grid-template-columns: 1fr 1fr; }
  .trust-stats .trust-stat:last-child { grid-column: span 2; }

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

  .footer__links { grid-template-columns: 1fr 1fr; }
  .footer__bottom { flex-direction: column; gap: 0.5rem; text-align: center; }

  .scroll-top { bottom: 1.25rem; right: 1.25rem; }
  .zeroclik-stat { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .footer__links { grid-template-columns: 1fr; }
  .hero__tags    { display: none; }
  .metrics__tabs { display: none; }
  .trust-stats   { grid-template-columns: 1fr; }
  .trust-stats .trust-stat:last-child { grid-column: span 1; }
  .contact__form-panel { padding: 1.75rem 1.25rem; }
  .about-metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-logos__grid { grid-template-columns: repeat(2, 1fr); }
}