@charset "UTF-8";

@font-face {
  font-family: "Pretendard";
  src: url("../fonts/PretendardVariable.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  /* Brand Accent */
  --brand-primary: #1a56db;
  --brand-blue-dark: #0f3ba5;

  /* Dark Theme Tokens (Slides 01, 04, 10, 12) */
  --dark-bg: #0d0e11;
  --dark-surface: #14161b;
  --dark-surface-subtle: #191c22;
  --dark-text-main: #f3f4f6;
  --dark-text-muted: #9ca3af;
  --dark-border: rgba(255, 255, 255, 0.1);
  --dark-border-subtle: rgba(255, 255, 255, 0.05);

  /* Light Theme Tokens (Slides 02, 03, 05, 06, 07, 08, 09, 11) */
  --light-bg: #f9f9f8;
  --light-surface: #ffffff;
  --light-surface-subtle: #f3f4f6;
  --light-text-main: #111317;
  --light-text-muted: #4b5262;
  --light-border: rgba(17, 19, 23, 0.1);
  --light-border-subtle: rgba(17, 19, 23, 0.05);

  /* 8pt Spacing Scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  /* Six-step typography scale */
  --type-meta: 0.875rem; /* 14px */
  --type-body: 0.9375rem; /* 15px */
  --type-lead: 1.125rem; /* 18px */
  --type-subhead: 1.5rem; /* 24px */
  --type-title: clamp(2rem, 2.4vw, 2.375rem); /* 32px ~ 38px */
  --type-hero: clamp(2.25rem, 3vw, 2.625rem); /* 36px ~ 42px */

  /* Layout Constants */
  --bar-height: 60px;
  --pad-x: clamp(var(--space-6), 4.5vw, var(--space-8));
  --pad-y: clamp(var(--space-6), 5vh, var(--space-8));
  --max-width: 1600px;
  --border-radius: 2px; /* Sharp & Architectural */
}

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

html, body {
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  background-color: var(--dark-bg);
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: var(--type-body);
  line-height: 1.65;
  color: var(--light-text-main);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

em, i, address {
  font-style: normal;
}

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

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

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

/* ----------------------------------------------------
   Monochrome Line Icon Core (Color STRICTLY FORBIDDEN)
---------------------------------------------------- */
.mono-icon {
  display: inline-block;
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  flex-shrink: 0;
}

.mono-icon-lg {
  width: 28px;
  height: 28px;
}

/* ----------------------------------------------------
   12-Column Architectural Grid System
---------------------------------------------------- */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--space-5);
  row-gap: var(--space-5);
  width: 100%;
}

.col-span-2  { grid-column: span 2 / span 2; }
.col-span-3  { grid-column: span 3 / span 3; }
.col-span-4  { grid-column: span 4 / span 4; }
.col-span-5  { grid-column: span 5 / span 5; }
.col-span-6  { grid-column: span 6 / span 6; }
.col-span-7  { grid-column: span 7 / span 7; }
.col-span-8  { grid-column: span 8 / span 8; }
.col-span-9  { grid-column: span 9 / span 9; }
.col-span-12 { grid-column: span 12 / span 12; }

/* ----------------------------------------------------
   Header Reader Bar
---------------------------------------------------- */
.reader-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--bar-height);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--pad-x);
  background: rgba(13, 14, 17, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  color: #ffffff;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--type-meta);
  font-weight: 800;
  letter-spacing: 0.16em;
}

.brand-symbol {
  width: 24px;
  height: 24px;
  object-fit: contain;
  flex-shrink: 0;
}

.reader-status {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--type-meta);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #9ca3af;
}

.reader-status #currentIndex {
  color: #ffffff;
  font-weight: 700;
}

.status-line {
  width: 48px;
  height: 1px;
  background: rgba(255, 255, 255, 0.2);
  overflow: hidden;
}

.status-line i {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--brand-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.reader-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.text-button {
  font-size: var(--type-meta);
  font-weight: 600;
  color: #9ca3af;
  transition: color 0.2s;
}

.text-button:hover {
  color: #ffffff;
}

.menu-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--type-meta);
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--border-radius);
  transition: border-color 0.2s, background-color 0.2s;
}

.menu-button:hover {
  border-color: rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.05);
}

/* ----------------------------------------------------
   Side Index Drawer (TOC)
---------------------------------------------------- */
.toc {
  position: fixed;
  top: 0;
  right: 0;
  width: min(460px, 90vw);
  height: 100vh;
  z-index: 300;
  background: #111216;
  color: #ffffff;
  padding: var(--space-7);
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.6);
  overflow-y: auto;
}

.toc.is-open {
  transform: translateX(0);
}

.toc-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: var(--type-meta);
  letter-spacing: 0.1em;
  color: #9ca3af;
}

.toc nav {
  display: flex;
  flex-direction: column;
  margin-top: var(--space-4);
}

.toc nav a {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  color: #9ca3af;
  font-size: var(--type-meta);
  transition: color 0.2s;
}

.toc nav a:hover, .toc nav a[aria-current="page"] {
  color: #ffffff;
}

.toc nav a span {
  font-weight: 700;
  color: var(--brand-primary);
}

.toc nav strong {
  font-weight: 600;
}

.toc nav small {
  font-size: var(--type-meta);
  color: #6b7280;
  text-transform: uppercase;
}

.toc-backdrop {
  position: fixed;
  inset: 0;
  z-index: 250;
  background: rgba(0, 0, 0, 0.6);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.toc-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

/* ----------------------------------------------------
   Fullpage Spreads Architecture
---------------------------------------------------- */
main {
  position: relative;
  width: 100vw;
  height: 100vh;
}

.spread {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  padding-top: var(--bar-height);
  overflow: hidden;
  visibility: hidden;
  display: flex;
  align-items: center;
}

.spread-inner {
  position: relative;
  z-index: 10;
  width: 100%;
  max-width: var(--max-width);
  height: calc(100vh - var(--bar-height));
  margin: 0 auto;
  padding: clamp(var(--space-4), 4vh, var(--space-7)) var(--pad-x);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(var(--space-3), 2.5vh, var(--space-6));
}

/* ----------------------------------------------------
   Theme Variations (Editorial Contrast Rhythm)
---------------------------------------------------- */
/* Dark Theme (01, 04, 10, 12) */
.spread--dark {
  background-color: var(--dark-bg);
  color: var(--dark-text-main);
}

.spread--dark .text-muted {
  color: var(--dark-text-muted);
}

/* Light Theme (02, 03, 05, 06, 07, 08, 09, 11) */
.spread--light {
  background-color: var(--light-bg);
  color: var(--light-text-main);
}

.spread--light .text-muted {
  color: var(--light-text-muted);
}

/* ----------------------------------------------------
   Hardware Border Highlight & Subtle Depth
---------------------------------------------------- */
.spread--dark .sharp-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045) 0%, rgba(255, 255, 255, 0.015) 100%);
  border: 1px solid var(--dark-border);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius);
  transition: border-color 0.25s, transform 0.25s;
}

.spread--dark .sharp-card:hover {
  border-color: rgba(255, 255, 255, 0.35);
  border-top-color: #60a5fa;
  transform: translateY(-2px);
}

.spread--light .sharp-card {
  background: var(--light-surface);
  border: 1px solid var(--light-border);
  border-top: 1px solid rgba(17, 19, 23, 0.15);
  border-radius: var(--border-radius);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02), 0 1px 2px rgba(0, 0, 0, 0.03);
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}

.spread--light .sharp-card:hover {
  border-color: rgba(17, 19, 23, 0.25);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

/* ----------------------------------------------------
   Browser Window Mockup Component
---------------------------------------------------- */
.browser-bar {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 10px;
  background: #f1f2f4;
  border-bottom: 1px solid rgba(17, 19, 23, 0.08);
}

.spread--dark .browser-bar {
  background: #181a20;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.browser-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(17, 19, 23, 0.2);
}

.spread--dark .browser-dot {
  background: rgba(255, 255, 255, 0.2);
}

.browser-url {
  margin-left: 6px;
  font-size: var(--type-meta);
  font-family: monospace;
  color: #8b929e;
  letter-spacing: 0.02em;
  background: rgba(0, 0, 0, 0.04);
  padding: 1px 8px;
  border-radius: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}

.spread--dark .browser-url {
  background: rgba(255, 255, 255, 0.06);
  color: #717784;
}

.spread--light .category-label {
  color: var(--brand-primary);
}

.spread--light .grid-marker {
  color: rgba(17, 19, 23, 0.2);
  border-color: rgba(17, 19, 23, 0.08);
}

/* ----------------------------------------------------
   Architectural Background Grid Markers
   (High-end Swiss Precision, replaces clumsy 300px numbers)
---------------------------------------------------- */
.grid-marker {
  position: absolute;
  right: var(--pad-x);
  bottom: var(--space-5);
  font-size: var(--type-meta);
  font-family: monospace;
  letter-spacing: 0.14em;
  pointer-events: none;
  user-select: none;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  z-index: 1;
}

.grid-marker::before {
  content: "+";
  font-size: var(--type-meta);
}

/* ----------------------------------------------------
   Shared Typography & Section Headers
---------------------------------------------------- */
.category-label {
  font-size: var(--type-meta);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.section-title {
  font-size: var(--type-title);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-2);
}

.section-desc {
  font-size: var(--type-body);
  line-height: 1.65;
  max-width: 640px;
}

/* GSAP Reveal Elements */
.line-mask {
  display: block;
  overflow: hidden;
}

.line-text {
  display: block;
  transform: translateY(115%);
}

.reveal-item {
  opacity: 0;
  transform: translateY(16px);
}

/* ----------------------------------------------------
   Atmospheric Ambient Background System (Cover & Contact)
---------------------------------------------------- */
.spread-ambient-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.spread-ambient-img {
  position: absolute;
  top: -5%;
  left: -5%;
  width: 110%;
  height: 110%;
  background-size: cover;
  background-position: center;
  opacity: 0.62; /* 0.22 -> 0.62 대폭 상향하여 배경 건축 디테일 확실히 노출 */
  filter: contrast(1.18) brightness(1.15);
  transform: scale(1.04);
  will-change: transform;
}

/* 텍스트 시인성을 완벽히 보장하면서 배경을 시원하게 여는 정밀 비네팅 */
.spread-ambient-vignette {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    linear-gradient(90deg, rgba(13, 14, 17, 0.88) 0%, rgba(13, 14, 17, 0.65) 36%, rgba(13, 14, 17, 0.18) 72%, transparent 100%),
    linear-gradient(180deg, rgba(13, 14, 17, 0.45) 0%, transparent 22%, transparent 78%, rgba(13, 14, 17, 0.65) 100%);
}

/* Slide 12 Contact: 100% 원본 그대로 알파값 없이 노출 + 배경색/비네팅 배제 */
#contact {
  background-color: transparent !important;
}

#contact .spread-ambient-img {
  opacity: 1; /* 알파값 없이 100% 원본 그대로 */
  filter: none;
}

#contact .spread-ambient-vignette {
  display: none;
}

/* Slide 03 Proof & History: 라이트 베이지 와이어프레임 앰비언트 배경 (짙은 색 배제 & 정갈한 블렌딩) */
#proof .spread-ambient-img {
  background-position: 85% center;
  opacity: 0.65; /* 옅고 화사한 톤으로 3D 와이어프레임 그리드 노출 */
  filter: contrast(1.05) brightness(1.02);
}

#proof .spread-ambient-vignette {
  background: 
    linear-gradient(90deg, #f9f9f8 0%, rgba(249, 249, 248, 0.85) 28%, rgba(249, 249, 248, 0.25) 60%, transparent 100%),
    linear-gradient(180deg, rgba(249, 249, 248, 0.45) 0%, transparent 20%, transparent 80%, rgba(249, 249, 248, 0.45) 100%);
}

/* Slide 08 Project Experience: 라이트 테마 기하학 와이어프레임 & 패럴랙스 인터랙티브 배경 */
#clients .spread-ambient-img {
  background-position: center center;
  opacity: 0.92;
  filter: contrast(1.02) brightness(1.0);
}

#clients .spread-ambient-vignette {
  background: 
    linear-gradient(90deg, rgba(249, 249, 248, 0.45) 0%, transparent 25%, transparent 75%, rgba(249, 249, 248, 0.45) 100%),
    linear-gradient(180deg, rgba(249, 249, 248, 0.45) 0%, transparent 20%, transparent 80%, rgba(249, 249, 248, 0.45) 100%);
}

/* ----------------------------------------------------
   SLIDE 01: Hero Cover (Architectural Precision)
---------------------------------------------------- */
.hero-layout {
  height: 100%;
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  align-items: center;
  column-gap: var(--space-8);
}

.hero-content {
  max-width: 760px;
}

.manifesto-card {
  padding: var(--space-6);
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--dark-border);
}

.manifesto-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--type-meta);
  font-family: monospace;
  letter-spacing: 0.12em;
  color: #60a5fa;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--dark-border);
  margin-bottom: var(--space-4);
}

.manifesto-dot {
  width: 6px;
  height: 6px;
  background: #60a5fa;
  border-radius: 50%;
}

.manifesto-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.manifesto-list li strong {
  display: block;
  font-size: var(--type-meta);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #ffffff;
  margin-bottom: 2px;
}

.manifesto-list li p {
  font-size: var(--type-meta);
  color: var(--dark-text-muted);
  line-height: 1.5;
}

/* ----------------------------------------------------
   SLIDE 01: Cover Showcase Mockup (Option A)
---------------------------------------------------- */
.cover-showcase {
  position: relative;
  width: 100%;
}

.cover-browser-window {
  border: 1px solid var(--dark-border);
  border-top: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--border-radius);
  background: #111216;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
}

.cover-browser-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: #16181f;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.cover-browser-url {
  margin-left: 8px;
  font-size: var(--type-meta);
  font-family: monospace;
  color: #9499a5;
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 12px;
  border-radius: 2px;
  letter-spacing: 0.04em;
}

.cover-showcase-img {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #08090b;
}

.cover-showcase-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.04);
}

.cover-showcase-meta {
  padding: 10px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #111317;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.cover-showcase-meta span {
  font-size: var(--type-meta);
  font-family: monospace;
  color: #60a5fa;
  letter-spacing: 0.08em;
}

.cover-showcase-meta strong {
  font-size: var(--type-meta);
  color: #ffffff;
  font-weight: 600;
}

/* ----------------------------------------------------
   SLIDE 09: Pipeline Conduit Rail Connection
---------------------------------------------------- */
.pipeline-conduit-wrap {
  position: relative;
  width: 100%;
}

.pipeline-rail {
  position: absolute;
  top: -12px;
  left: 20px;
  right: 20px;
  height: 1px;
  background: linear-gradient(90deg, var(--brand-primary) 0%, rgba(26, 86, 219, 0.2) 100%);
  z-index: 1;
}

.pipeline-node {
  position: absolute;
  top: -4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand-primary);
  box-shadow: 0 0 8px rgba(26, 86, 219, 0.5);
}

/* Client Logo Styling */
.client-logo-item {
  height: 84px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3);
  transition: border-color 0.2s, transform 0.2s;
}

.client-logo-item svg, .client-logo-item img {
  max-height: 28px;
  max-width: 130px;
  width: auto;
  height: auto;
  fill: currentColor;
  opacity: 0.85;
  transition: opacity 0.2s;
}

.client-logo-item:hover svg, .client-logo-item:hover img {
  opacity: 1;
}


.hero-title {
  font-size: var(--type-hero);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.035em;
  margin: var(--space-4) 0;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.85);
}

.hero-title span.point {
  color: #60a5fa;
}

.hero-desc {
  font-size: var(--type-body);
  line-height: 1.7;
  color: #d1d5db;
  max-width: 620px;
  margin-bottom: var(--space-6);
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.8);
}

.hero-metrics {
  display: flex;
  gap: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--dark-border);
}

.hero-metric-item span {
  display: block;
  font-size: var(--type-meta);
  color: var(--dark-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero-metric-item strong {
  font-size: var(--type-subhead);
  font-weight: 800;
  color: #ffffff;
}

/* ----------------------------------------------------
   SLIDE 02: Positioning (When to call us)
---------------------------------------------------- */
.situation-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-3);
}

.situation-box {
  position: relative;
  overflow: hidden;
  padding: var(--space-5) var(--space-5);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 250px;
  background: #ffffff;
  border: 1px solid var(--light-border);
  border-top: 1px solid rgba(26, 86, 219, 0.35);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}

.situation-box:hover {
  border-color: rgba(26, 86, 219, 0.4);
  border-top-color: var(--brand-primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(26, 86, 219, 0.08);
}

.situation-box > div,
.situation-box > p {
  position: relative;
  z-index: 2;
}

.box-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3);
}

.box-num {
  font-size: var(--type-meta);
  font-weight: 700;
  color: var(--brand-primary);
  font-family: monospace;
}

.situation-box h3 {
  font-size: var(--type-body);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.situation-box p {
  font-size: var(--type-meta);
  color: var(--light-text-muted);
  line-height: 1.55;
}

/* ----------------------------------------------------
   SLIDE 03: Proof & History
---------------------------------------------------- */
.metrics-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin: var(--space-5) 0;
}

.metric-unit {
  position: relative;
  overflow: hidden;
  padding: var(--space-6) var(--space-5);
  background: #ffffff;
  border: 1px solid var(--light-border);
  border-top: 1px solid rgba(26, 86, 219, 0.35);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}

.metric-unit:hover {
  border-color: rgba(26, 86, 219, 0.4);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(26, 86, 219, 0.08);
}

.metric-unit > div,
.metric-unit > h4,
.metric-unit > p {
  position: relative;
  z-index: 2;
}

.metric-number {
  font-size: var(--type-hero);
  font-weight: 800;
  line-height: 1;
  color: var(--brand-primary);
  letter-spacing: -0.04em;
  margin-bottom: var(--space-2);
}

.metric-number sup {
  font-size: var(--type-meta);
}

.metric-unit h4 {
  font-size: var(--type-meta);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.metric-unit p {
  font-size: var(--type-meta);
  color: var(--light-text-muted);
}

.history-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--light-border);
}

.history-col time {
  font-size: var(--type-meta);
  font-weight: 700;
  color: var(--brand-primary);
  font-family: monospace;
  display: block;
  margin-bottom: 2px;
}

.history-col strong {
  font-size: var(--type-body);
  font-weight: 700;
  display: block;
  margin-bottom: 2px;
}

.history-col p {
  font-size: var(--type-meta);
  color: var(--light-text-muted);
}

/* ----------------------------------------------------
   SLIDE 04: Full Capability (Dark)
---------------------------------------------------- */
.capability-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.capability-card {
  position: relative;
  overflow: hidden;
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 340px;
  background: #111317;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
  transition: border-color 0.25s, transform 0.25s;
}

.capability-card:hover {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: #60a5fa;
  transform: translateY(-3px);
}

.capability-card > div,
.capability-card-list {
  position: relative;
  z-index: 2;
}

.capability-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--dark-border);
}

.cap-index {
  font-size: var(--type-meta);
  font-weight: 700;
  color: #60a5fa;
  font-family: monospace;
}

.capability-card h3 {
  font-size: var(--type-lead);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.capability-card p {
  font-size: var(--type-body);
  color: var(--dark-text-muted);
  line-height: 1.6;
}

.capability-card-list {
  list-style: none;
  margin-top: var(--space-4);
  border-top: 1px solid var(--dark-border-subtle);
  padding-top: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.capability-card-list li {
  font-size: var(--type-meta);
  color: #d1d5db;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.capability-card-list li::before {
  content: "—";
  color: #60a5fa;
}

/* ----------------------------------------------------
   SLIDE 05: Core Philosophy
---------------------------------------------------- */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
  margin-top: var(--space-5);
}

.philosophy-card {
  position: relative;
  overflow: hidden;
  padding: var(--space-6);
  min-height: 310px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #ffffff;
  border: 1px solid var(--light-border);
  border-top: 1px solid rgba(26, 86, 219, 0.35);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}

.philosophy-card:hover {
  border-color: rgba(26, 86, 219, 0.4);
  border-top-color: var(--brand-primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(26, 86, 219, 0.08);
}

.philosophy-card > div,
.philosophy-card > p {
  position: relative;
  z-index: 2;
}

.phil-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
}

.phil-num {
  font-size: var(--type-meta);
  font-weight: 700;
  font-family: monospace;
  color: var(--brand-primary);
}

.philosophy-card h3 {
  font-size: var(--type-lead);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.philosophy-card p {
  font-size: var(--type-body);
  color: var(--light-text-muted);
  line-height: 1.65;
}

/* ----------------------------------------------------
   SLIDES 06 & 07: Selected Works 6-Card Grid (3x2)
---------------------------------------------------- */
.works-grid-6 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.work-card-unit {
  background: var(--light-surface);
  border: 1px solid var(--light-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s, transform 0.2s;
}

.work-card-unit:hover {
  border-color: var(--brand-primary);
  transform: translateY(-2px);
}

.work-card-thumb {
  width: 100%;
  aspect-ratio: 2.15 / 1;
  max-height: 130px;
  overflow: hidden;
  background: #e5e7eb;
  border-bottom: 1px solid rgba(17, 19, 23, 0.08);
}

.work-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.work-card-unit:hover .work-card-thumb img {
  transform: scale(1.03);
}

.work-card-content {
  padding: 8px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.work-card-tag {
  font-size: var(--type-meta);
  font-weight: 700;
  color: var(--brand-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.work-card-title {
  font-size: var(--type-meta);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--light-text-main);
}

.work-card-desc {
  font-size: var(--type-meta);
  color: var(--light-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ----------------------------------------------------
   SLIDE 08: Our Clients
---------------------------------------------------- */
#clients {
  position: relative;
  background-color: var(--light-bg);
}

.clients-grid-12 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.clients-note {
  margin-top: var(--space-3);
  color: var(--light-text-muted);
  font-size: var(--type-meta);
}

#clients .client-logo-item {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#clients .client-logo-item:hover {
  background: #ffffff;
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(26, 86, 219, 0.08);
}

/* ----------------------------------------------------
   SLIDE 09: Delivery System (6-Step Pipeline)
---------------------------------------------------- */
.pipeline-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.pipeline-card {
  position: relative;
  overflow: hidden;
  padding: var(--space-5) var(--space-4);
  min-height: 290px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #111317;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
  transition: border-color 0.25s, transform 0.25s;
}

.pipeline-card:hover {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: #60a5fa;
  transform: translateY(-3px);
}

.pipeline-step-header {
  margin-bottom: var(--space-3);
  position: relative;
  z-index: 2;
}

.pipeline-num {
  font-size: var(--type-meta);
  font-weight: 700;
  color: #60a5fa;
  font-family: monospace;
  letter-spacing: 0.08em;
}

.pipeline-card h3 {
  font-size: var(--type-body);
  font-weight: 700;
  color: #ffffff;
  margin-bottom: var(--space-2);
  position: relative;
  z-index: 2;
}

.pipeline-card p {
  font-size: var(--type-meta);
  color: #9ca3af;
  line-height: 1.6;
  position: relative;
  z-index: 2;
}

.pipeline-checkpoint {
  font-size: var(--type-meta);
  font-weight: 700;
  color: #60a5fa;
  letter-spacing: 0.06em;
  padding-top: var(--space-3);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-transform: uppercase;
  position: relative;
  z-index: 2;
}

/* Large Watermark Line Icon (Unified Standard: 180px & Hardware Micro-motion) */
.step-bg-icon,
.card-bg-icon {
  position: absolute;
  right: -38px;
  bottom: -38px;
  width: 180px;
  height: 180px;
  stroke-width: 1.35;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  pointer-events: none;
  z-index: 1;
  /* SVG 전체에 opacity를 적용하여 내부 패스 교차점의 알파 중첩(dark spots) 원천 차단 */
  transition: opacity 0.3s ease, stroke 0.3s ease, transform 0.4s ease;
}

/* Light Theme Card Watermark: 불투명 단색 + SVG 전체 투명도 */
.card-bg-icon--light {
  stroke: #111317;
  opacity: 0.06;
}

.situation-box:hover .card-bg-icon--light,
.metric-unit:hover .card-bg-icon--light,
.philosophy-card:hover .card-bg-icon--light {
  stroke: var(--brand-primary);
  opacity: 0.25;
  transform: scale(1.05) rotate(2deg);
}

/* Dark Theme Card Watermark: 퓨어 화이트 + SVG 전체 투명도 */
.step-bg-icon,
.card-bg-icon--dark {
  stroke: #ffffff;
  opacity: 0.16;
}

.pipeline-card:hover .step-bg-icon,
.capability-card:hover .card-bg-icon--dark,
.tech-box:hover .card-bg-icon--dark {
  stroke: #60a5fa;
  opacity: 0.32;
  transform: scale(1.05) rotate(2deg);
}

/* ----------------------------------------------------
   SLIDE 10: Tech Stack (Dark)
---------------------------------------------------- */
.tech-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.tech-box {
  position: relative;
  overflow: hidden;
  padding: var(--space-5);
  min-height: 330px;
  display: flex;
  flex-direction: column;
  background: #111317;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
  transition: border-color 0.25s, transform 0.25s;
}

.tech-box:hover {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: #60a5fa;
  transform: translateY(-3px);
}

.tech-box-header,
.tech-box > p,
.tech-stack-items {
  position: relative;
  z-index: 2;
}

.tech-box-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.tech-box h4 {
  font-size: var(--type-lead);
  font-weight: 700;
  color: #60a5fa;
}

.tech-box > p {
  font-size: var(--type-meta);
  color: var(--dark-text-muted);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--dark-border);
  margin-bottom: var(--space-4);
}

.tech-stack-items {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.tech-stack-items li {
  font-size: var(--type-meta);
  color: #e5e7eb;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.tech-stack-items li::before {
  content: "•";
  color: #60a5fa;
}

/* ----------------------------------------------------
   SLIDE 11: Trust & Assurance
---------------------------------------------------- */
.trust-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: stretch;
  gap: var(--space-6);
  margin-top: var(--space-5);
}

.trust-stack {
  display: grid;
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
  height: 100%;
}

.management-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-5);
}

.award-card {
  height: 100%;
  padding: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.meta-label {
  display: inline-block;
  font-family: monospace;
  font-size: var(--type-meta);
  font-weight: 700;
  color: var(--brand-primary);
}

.meta-label--award {
  color: #dc2626;
}

.award-card h4 {
  margin-top: 2px;
  font-size: var(--type-lead);
  font-weight: 700;
}

.award-card p {
  margin-top: 4px;
  font-size: var(--type-meta);
  color: var(--light-text-muted);
}

.award-logo-frame {
  width: 76px;
  height: 90px;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid var(--light-border);
  border-radius: var(--border-radius);
  flex-shrink: 0;
}

.award-logo-frame img {
  width: 380px;
  max-width: none;
  margin-top: -55px;
  margin-left: -90px;
}

.cert-card {
  height: 100%;
  padding: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.cert-card h3 {
  margin: 4px 0 8px;
  font-size: var(--type-subhead);
  font-weight: 700;
  line-height: 1.3;
}

.cert-card p {
  font-size: var(--type-meta);
  color: var(--light-text-muted);
  line-height: 1.6;
}

.certificate-link {
  display: inline-block;
  margin-top: var(--space-4);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--brand-primary);
  color: var(--brand-primary);
  font-size: var(--type-meta);
  font-weight: 700;
}

.cert-card img {
  max-height: 330px;
  border: 1px solid var(--light-border);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

/* ----------------------------------------------------
   SLIDE 12: Contact Finale (Dark)
---------------------------------------------------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  column-gap: var(--space-8);
  align-items: center;
  height: 100%;
}

.contact-channels {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  margin: var(--space-5) 0 var(--space-6);
}

.contact-channels a {
  font-size: var(--type-lead);
  font-weight: 700;
  color: #ffffff;
  border-bottom: 1px solid #60a5fa;
  padding-bottom: 2px;
  transition: color 0.2s;
}

.contact-channels a:hover {
  color: #60a5fa;
}

.cta-link-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px 24px;
  border-radius: var(--border-radius);
  background: var(--brand-primary);
  color: #ffffff;
  font-weight: 700;
  font-size: var(--type-meta);
  letter-spacing: 0.06em;
  transition: background-color 0.2s;
}

.cta-link-btn:hover {
  background: var(--brand-blue-dark);
}

.offices-panel {
  padding: var(--space-6);
}

.office-block {
  margin-bottom: var(--space-5);
}

.office-block:last-child {
  margin-bottom: 0;
}

.office-block span {
  font-size: var(--type-meta);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #60a5fa;
  text-transform: uppercase;
  display: block;
  margin-bottom: 4px;
}

.office-block strong {
  font-size: var(--type-body);
  font-weight: 700;
  display: block;
}

.office-block p {
  font-size: var(--type-meta);
  color: var(--dark-text-muted);
  line-height: 1.5;
  margin-top: 2px;
}

/* ----------------------------------------------------
   Print Stylesheet (A4 Landscape)
---------------------------------------------------- */
@media print {
  @page {
    size: A4 landscape;
    margin: 0;
  }

  html, body {
    overflow: visible !important;
    height: auto !important;
    background: #ffffff !important;
  }

  .reader-bar, .toc, .toc-backdrop, .skip-link {
    display: none !important;
  }

  main {
    height: auto !important;
    overflow: visible !important;
  }

  .spread {
    position: relative !important;
    visibility: visible !important;
    opacity: 1 !important;
    transform: none !important;
    width: 297mm !important;
    height: 210mm !important;
    min-height: 210mm !important;
    max-height: 210mm !important;
    padding-top: 0 !important;
    overflow: hidden !important;
    page-break-after: always;
    break-after: page;
  }

  .spread:last-of-type {
    page-break-after: auto !important;
    break-after: auto !important;
  }

  .line-text, .reveal-item {
    transform: none !important;
    opacity: 1 !important;
    visibility: visible !important;
  }

  .spread-inner {
    height: 210mm !important;
    max-height: 210mm !important;
    padding: 14mm !important;
  }

  .spread--dark {
    background: #111216 !important;
    color: #ffffff !important;
  }

  .spread--light {
    background: #ffffff !important;
    color: #111317 !important;
  }
}