/* =========================================================
   The Brilliant Star of UISEONG — 통합 공공 미디어 플랫폼 제안
   OREUM · DK Global
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --ink:        #0b1020;   /* near-black midnight */
  --ink-2:      #121a31;
  --navy:       #1a3460;
  --navy-soft:  #2a4a82;
  --blue:       #4d8ef0;   /* 시민의 별 */
  --blue-deep:  #2f6df0;
  --gold:       #d8a84a;   /* 조문국의 별 */
  --gold-soft:  #f0d49a;
  --charcoal:   #14181f;
  --gray:       #6b7280;
  --gray-2:     #9aa3b2;
  --gray-light: #f4f6fa;
  --border:     #e5e8ef;
  --white:      #ffffff;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans KR', 'Apple SD Gothic Neo', sans-serif;
  font-size: 17px;
  line-height: 1.85;
  color: var(--charcoal);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
b { font-weight: 700; }
.en { font-family: 'Montserrat', sans-serif; }

/* ===== SCROLL PROGRESS ===== */
#progress {
  position: fixed; top: 0; left: 0; height: 3px; z-index: 1000;
  width: 0; transition: width 0.1s linear;
  background: linear-gradient(90deg, var(--gold), var(--blue));
}

/* ===== NAV ===== */
nav {
  position: fixed; top: 3px; left: 0; right: 0; z-index: 950;
  height: 64px; padding: 0 44px;
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(11,16,32,0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: background 0.3s;
}
.nav-brand {
  font-family: 'Montserrat', sans-serif;
  font-size: 15px; font-weight: 700; letter-spacing: 0.12em;
  color: #fff; text-decoration: none; display: flex; gap: 7px;
}
.nav-brand span { color: var(--gold); }
.nav-links { display: flex; gap: 30px; }
.nav-links a {
  font-size: 14px; color: rgba(255,255,255,0.65); letter-spacing: 0.02em;
  text-decoration: none; transition: color 0.2s; position: relative;
}
.nav-links a:hover { color: #fff; }
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -6px; height: 2px; width: 0;
  background: var(--gold); transition: width 0.25s;
}
.nav-links a:hover::after { width: 100%; }
.nav-menu-btn {
  display: none; background: none; border: none; font-size: 22px;
  color: #fff; cursor: pointer; padding: 8px;
}
.mobile-menu {
  display: none; flex-direction: column;
  position: fixed; top: 67px; left: 0; right: 0; z-index: 900;
  background: var(--ink); border-bottom: 1px solid rgba(255,255,255,0.1);
  padding: 10px 0;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: 13px 32px; font-size: 15px; color: rgba(255,255,255,0.8);
  text-decoration: none; border-bottom: 1px solid rgba(255,255,255,0.06);
}
.mobile-menu a:last-child { border: none; }

/* =========================================================
   HERO
   ========================================================= */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; overflow: hidden;
  background: radial-gradient(ellipse 80% 70% at 50% 38%, #16224a 0%, var(--ink) 62%);
  color: #fff; padding: 120px 24px 80px;
}
.hero-bg {
  position: absolute; inset: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 20% 30%, rgba(255,255,255,0.7), transparent),
    radial-gradient(1.5px 1.5px at 70% 20%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 40% 70%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1.5px 1.5px at 85% 60%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 30% 85%, rgba(255,255,255,0.45), transparent),
    radial-gradient(1px 1px at 60% 50%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1.5px 1.5px at 90% 30%, rgba(255,255,255,0.55), transparent),
    radial-gradient(1px 1px at 10% 55%, rgba(255,255,255,0.5), transparent);
  opacity: 0.9; animation: twinkle 6s ease-in-out infinite alternate;
}
@keyframes twinkle { from { opacity: 0.55; } to { opacity: 1; } }

.hero-orb {
  position: absolute; top: 50%; left: 50%;
  width: 620px; height: 620px; transform: translate(-50%, -54%);
  pointer-events: none;
}
.orb-core {
  position: absolute; inset: 34%;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 34%, #cfe0ff 0%, var(--blue) 40%, #1d3f8f 72%, transparent 78%);
  box-shadow: 0 0 90px 20px rgba(77,142,240,0.45);
  animation: orbpulse 5s ease-in-out infinite;
}
@keyframes orbpulse { 0%,100% { transform: scale(1); opacity: 0.92; } 50% { transform: scale(1.06); opacity: 1; } }
.orb-ring {
  position: absolute; inset: 0; border-radius: 50%;
  border: 1px solid rgba(120,160,240,0.18);
}
.orb-ring.r1 { inset: 8%;  animation: spin 26s linear infinite; border-top-color: rgba(214,168,74,0.4); }
.orb-ring.r2 { inset: 20%; animation: spin 20s linear infinite reverse; border-left-color: rgba(77,142,240,0.5); }
.orb-ring.r3 { inset: 30%; animation: spin 32s linear infinite; border-bottom-color: rgba(255,255,255,0.25); }
@keyframes spin { to { transform: rotate(360deg); } }

.hero-inner { position: relative; z-index: 3; max-width: 880px; }
.hero-eyebrow {
  font-family: 'Montserrat', sans-serif;
  font-size: 13px; letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--gold-soft); margin-bottom: 28px;
  opacity: 0; animation: fadeUp 0.9s 0.1s forwards;
}
.hero-title {
  font-size: clamp(30px, 5.2vw, 60px);
  font-weight: 300; line-height: 1.28; letter-spacing: -0.01em;
  margin-bottom: 26px;
  opacity: 0; animation: fadeUp 1s 0.25s forwards;
}
.hero-title em { font-style: normal; color: var(--gold); font-weight: 500; }
.hero-title strong {
  font-weight: 900;
  background: linear-gradient(100deg, #fff 10%, #bcd2ff 55%, var(--gold-soft) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: clamp(15px, 2vw, 19px); line-height: 1.9;
  color: rgba(255,255,255,0.72); margin-bottom: 38px;
  opacity: 0; animation: fadeUp 1s 0.45s forwards;
}
.hero-sub b { color: #fff; font-weight: 700; }
.hero-tags {
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
  margin-bottom: 56px;
  opacity: 0; animation: fadeUp 1s 0.65s forwards;
}
.hero-tags span {
  font-size: 13px; letter-spacing: 0.04em;
  border: 1px solid rgba(255,255,255,0.22); color: rgba(255,255,255,0.82);
  padding: 8px 18px; border-radius: 100px;
  background: rgba(255,255,255,0.04);
}
.hero-tags span:last-child { border-color: var(--gold); color: var(--gold-soft); }
.hero-scroll {
  display: inline-block; font-size: 14px; letter-spacing: 0.06em;
  color: rgba(255,255,255,0.7); text-decoration: none;
  padding: 11px 26px; border-radius: 100px;
  border: 1px solid rgba(255,255,255,0.25); transition: all 0.25s;
  opacity: 0; animation: fadeUp 1s 0.85s forwards;
}
.hero-scroll:hover { background: #fff; color: var(--ink); border-color: #fff; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: translateY(0); } }

/* =========================================================
   EXECUTIVE SUMMARY  (showpiece)
   ========================================================= */
.summary {
  position: relative; overflow: hidden;
  background:
    linear-gradient(180deg, #0b1020 0%, #0e1530 50%, #0b1020 100%);
  color: #fff; padding: 110px 0 120px;
}
.sum-glow {
  position: absolute; top: -10%; left: 50%; transform: translateX(-50%);
  width: 900px; height: 600px; pointer-events: none;
  background: radial-gradient(ellipse at center, rgba(77,142,240,0.22), transparent 60%);
}
.sum-inner { position: relative; z-index: 2; max-width: 1080px; margin: 0 auto; padding: 0 44px; }

.sum-head { text-align: center; margin-bottom: 64px; }
.sum-kicker {
  font-family: 'Montserrat', sans-serif;
  font-size: 13px; letter-spacing: 0.3em; color: var(--gold);
  margin-bottom: 16px;
}
.sum-h2 {
  font-size: clamp(28px, 4vw, 46px); font-weight: 900; letter-spacing: -0.01em;
  line-height: 1.2; margin-bottom: 12px;
}
.sum-lead { font-size: 16px; color: rgba(255,255,255,0.55); letter-spacing: 0.02em; }

.sum-row {
  display: grid; grid-template-columns: 120px 1fr; gap: 32px;
  align-items: start; padding: 30px 0;
  border-top: 1px solid rgba(255,255,255,0.09);
}
.sum-row:first-of-type { border-top: none; }
.sum-tag {
  font-size: 17px; font-weight: 700; letter-spacing: 0.18em;
  color: var(--ink); background: linear-gradient(135deg, #fff, #cdd9f2);
  padding: 9px 0; text-align: center; border-radius: 100px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}
.sum-body { min-width: 0; }
.sum-big {
  font-size: clamp(20px, 2.6vw, 30px); font-weight: 700; line-height: 1.4;
  letter-spacing: -0.01em; margin-bottom: 8px;
}
.sum-big .hl { color: var(--gold); }
.sum-desc { font-size: 16px; color: rgba(255,255,255,0.7); line-height: 1.85; }
.sum-desc b { color: #fff; }

/* 듀얼 트윈 카드 */
.sum-twin {
  display: grid; grid-template-columns: 1fr 44px 1fr; align-items: stretch;
  gap: 0; margin: 22px 0 18px;
}
.twin-card {
  border-radius: 14px; padding: 22px 24px;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.1);
  position: relative; overflow: hidden;
}
.twin-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
}
.twin-gold::before { background: linear-gradient(90deg, var(--gold), var(--gold-soft)); }
.twin-blue::before { background: linear-gradient(90deg, var(--blue-deep), var(--blue)); }
.twin-gold { box-shadow: 0 0 0 1px rgba(216,168,74,0.25) inset; }
.twin-blue { box-shadow: 0 0 0 1px rgba(77,142,240,0.25) inset; }
.twin-id { font-size: 17px; font-weight: 700; margin-bottom: 2px; }
.twin-gold .twin-id { color: var(--gold-soft); }
.twin-blue .twin-id { color: #aaccff; }
.twin-role { font-size: 13px; color: rgba(255,255,255,0.55); margin-bottom: 14px; letter-spacing: 0.04em; }
.twin-spec { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 4px; }
.twin-loc { font-size: 14px; color: rgba(255,255,255,0.6); }
.twin-link {
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; font-weight: 300; color: rgba(255,255,255,0.4);
}
.sum-merge {
  font-size: 16px; color: rgba(255,255,255,0.85); text-align: center;
  padding: 14px; border-radius: 10px;
  background: rgba(77,142,240,0.1); border: 1px solid rgba(77,142,240,0.18);
}
.sum-merge b { color: #fff; }

/* 구성 4-grid */
.sum-comp { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.comp-item {
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px; padding: 20px 18px; transition: transform 0.25s, background 0.25s;
}
.comp-item:hover { transform: translateY(-4px); background: rgba(255,255,255,0.08); }
.comp-n {
  font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 700;
  color: var(--gold); letter-spacing: 0.08em;
}
.comp-t { font-size: 16px; font-weight: 700; margin: 8px 0 6px; }
.comp-d { font-size: 13.5px; color: rgba(255,255,255,0.62); line-height: 1.6; }

/* 예산 강조 */
.sum-budget { align-items: center; }
.sum-budget .sum-tag { background: linear-gradient(135deg, var(--gold), var(--gold-soft)); color: #2a1c00; }
.bud-line { font-size: clamp(20px, 3vw, 30px); font-weight: 600; line-height: 1.3; }
.bud-num {
  font-family: 'Montserrat', sans-serif; font-weight: 800;
  font-size: clamp(30px, 5vw, 52px); letter-spacing: -0.01em;
  background: linear-gradient(100deg, var(--gold-soft), #fff 60%, var(--blue));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin: 0 6px; vertical-align: -2px;
}
.bud-note { font-size: 14px; color: rgba(255,255,255,0.5); margin-top: 6px; }

/* =========================================================
   GENERIC SECTION SYSTEM
   ========================================================= */
.sec { padding: 104px 0; }
.sec-light { background: var(--gray-light); }
.sec-dark { background: var(--ink); color: #fff; }
.container { max-width: 1160px; margin: 0 auto; padding: 0 44px; }

.sec-divider { width: 44px; height: 3px; background: var(--navy); margin-bottom: 26px; border-radius: 3px; }
.sec-divider.gold { background: var(--gold); }
.sec-divider.blue { background: var(--blue); }
.sec-label {
  font-family: 'Montserrat', sans-serif;
  font-size: 13px; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--navy); font-weight: 700; margin-bottom: 14px;
}
.sec-label.gold { color: var(--gold); }
.sec-label.blue { color: var(--blue); }
.sec-title {
  font-size: clamp(26px, 3.4vw, 42px); font-weight: 300;
  line-height: 1.32; letter-spacing: -0.01em; color: var(--charcoal); margin-bottom: 18px;
}
.sec-title strong { font-weight: 800; }
.sec-title.light { color: #fff; }
.sec-body { font-size: 17px; color: var(--gray); line-height: 1.95; max-width: 720px; }
.sec-body.light { color: rgba(255,255,255,0.72); }

/* ===== REVEAL ===== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }
.d1 { transition-delay: 0.1s; } .d2 { transition-delay: 0.2s; }
.d3 { transition-delay: 0.3s; } .d4 { transition-delay: 0.4s; }

/* =========================================================
   EVOLUTION / VENN
   ========================================================= */
.evo-flow {
  display: flex; align-items: center; justify-content: center; gap: 40px;
  margin-top: 60px; flex-wrap: wrap;
}
.evo-past {
  flex-shrink: 0; width: 220px; text-align: center;
  border: 1px dashed #c2c9d6; border-radius: 14px; padding: 32px 20px; background: #fff;
}
.evo-tag { font-size: 14px; font-weight: 700; color: var(--gray); margin-bottom: 10px; letter-spacing: 0.04em; }
.evo-past-desc { font-size: 15px; color: var(--gray); line-height: 1.7; }
.evo-arrow { font-size: 34px; color: var(--navy); font-weight: 300; }
.evo-venn { position: relative; width: 320px; height: 280px; flex-shrink: 0; }
.venn {
  position: absolute; width: 180px; height: 180px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; text-align: center;
  font-size: 14px; font-weight: 700; line-height: 1.35; color: var(--charcoal);
  mix-blend-mode: multiply;
}
.venn span { position: relative; z-index: 2; }
.venn.v1 { top: 0;   left: 70px; background: rgba(216,168,74,0.42); }
.venn.v2 { top: 95px; left: 0;   background: rgba(77,142,240,0.40); }
.venn.v3 { top: 95px; left: 140px; background: rgba(120,200,150,0.42); }
.evo-conc {
  margin: 56px auto 0; max-width: 760px; text-align: center;
  font-size: 18px; line-height: 1.9; color: var(--charcoal);
  padding: 26px 32px; border-radius: 14px; background: #fff;
  border: 1px solid var(--border); box-shadow: 0 14px 40px rgba(20,40,80,0.06);
}
.evo-conc b { color: var(--navy); }

/* =========================================================
   DUAL LANDMARK CARDS
   ========================================================= */
.dual-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 56px; }
.dual-card {
  position: relative; overflow: hidden; padding: 40px 38px;
  border-radius: 18px; background: #fff; border: 1px solid var(--border);
  box-shadow: 0 16px 44px rgba(20,40,80,0.06); transition: transform 0.3s, box-shadow 0.3s;
}
.dual-card:hover { transform: translateY(-6px); box-shadow: 0 26px 60px rgba(20,40,80,0.12); }
.dual-edge { position: absolute; top: 0; left: 0; right: 0; height: 5px; }
.dual-card.gold .dual-edge { background: linear-gradient(90deg, var(--gold), var(--gold-soft)); }
.dual-card.blue .dual-edge { background: linear-gradient(90deg, var(--blue-deep), var(--blue)); }
.dual-no { font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 700; letter-spacing: 0.1em; color: var(--gray); margin-bottom: 6px; }
.dual-name { font-size: 30px; font-weight: 800; letter-spacing: -0.01em; }
.dual-card.gold .dual-name { color: #b8841f; }
.dual-card.blue .dual-name { color: var(--blue-deep); }
.dual-kind { font-size: 15px; color: var(--gray); margin: 4px 0 22px; }
.dual-meta { list-style: none; }
.dual-meta li {
  display: grid; grid-template-columns: 52px 1fr; gap: 14px; padding: 12px 0;
  border-top: 1px solid var(--border); font-size: 16px; line-height: 1.6;
}
.dual-meta li span { color: var(--gray); font-size: 14px; font-weight: 600; padding-top: 2px; }
.dual-meta li b { font-weight: 600; color: var(--charcoal); }

/* =========================================================
   SHOWCASE SHOTS (dark sections)
   ========================================================= */
.accent-gold { background: linear-gradient(180deg, #15110a 0%, var(--ink) 100%); }
.accent-blue { background: linear-gradient(180deg, #0a1330 0%, var(--ink) 100%); }
.shot { margin: 56px 0 64px; }
.shot img { width: 100%; max-height: 620px; object-fit: cover; }
.shot figcaption {
  text-align: center; font-size: 14px; color: rgba(255,255,255,0.5);
  margin-top: 14px; letter-spacing: 0.03em;
}

.tri-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.tri-item {
  padding: 30px 28px; border-radius: 14px;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.1);
  transition: background 0.25s, transform 0.25s;
}
.tri-item:hover { background: rgba(255,255,255,0.07); transform: translateY(-4px); }
.tri-ico {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 12px; font-size: 20px;
  background: rgba(255,255,255,0.08); margin-bottom: 16px;
}
.accent-gold .tri-ico { color: var(--gold-soft); }
.accent-blue .tri-ico { color: #9cc4ff; }
.tri-item h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; color: #fff; }
.tri-item p { font-size: 15px; color: rgba(255,255,255,0.68); line-height: 1.7; }

/* ===== BEFORE / AFTER SLIDER ===== */
.slider-outer { margin: 8px 0 60px; }
.slider-hint { text-align: center; font-size: 14px; color: rgba(255,255,255,0.55); margin-bottom: 14px; letter-spacing: 0.04em; }
.slider-wrap { position: relative; overflow: hidden; cursor: ew-resize; user-select: none; line-height: 0; max-width: 1280px; margin: 0 auto; }
.slider-after img { width: 100%; height: 540px; object-fit: cover; }
.slider-before { position: absolute; inset: 0; overflow: hidden; width: 50%; }
.slider-before img { width: auto; min-width: 200%; height: 100%; object-fit: cover; object-position: left; pointer-events: none; }
.slider-line { position: absolute; top: 0; bottom: 0; left: 50%; width: 2px; background: #fff; transform: translateX(-50%); display: flex; align-items: center; justify-content: center; }
.slider-btn { width: 46px; height: 46px; background: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; box-shadow: 0 2px 14px rgba(0,0,0,0.4); color: var(--charcoal); font-weight: 700; letter-spacing: -2px; }
.slider-tag { position: absolute; top: 18px; font-size: 13px; font-weight: 600; letter-spacing: 0.08em; padding: 7px 16px; border-radius: 100px; }
.tag-before { left: 18px; background: rgba(0,0,0,0.6); color: #fff; }
.tag-after { right: 18px; background: var(--blue-deep); color: #fff; }

/* =========================================================
   HARDWARE
   ========================================================= */
.hw-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 56px; }
.hw-card { background: #fff; border: 1px solid var(--border); border-radius: 18px; overflow: hidden; box-shadow: 0 16px 44px rgba(20,40,80,0.06); }
.hw-draw { background: linear-gradient(180deg, #eef1f7, #e4e8f1); padding: 28px; display: flex; align-items: flex-end; justify-content: center; min-height: 300px; }
.hw-draw img { max-height: 320px; width: auto; object-fit: contain; filter: drop-shadow(0 8px 16px rgba(0,0,0,0.12)); }
.hw-info { padding: 28px 32px 34px; }
.hw-id { font-size: 18px; font-weight: 800; margin-bottom: 16px; }
.hw-id.gold { color: #b8841f; } .hw-id.blue { color: var(--blue-deep); }
.hw-spec { list-style: none; }
.hw-spec li { display: grid; grid-template-columns: 48px 1fr; gap: 14px; padding: 11px 0; border-top: 1px solid var(--border); font-size: 15.5px; line-height: 1.6; }
.hw-spec li span { color: var(--gray); font-size: 14px; font-weight: 600; padding-top: 1px; }
.hw-spec li b { font-weight: 600; }

/* =========================================================
   ECOSYSTEM
   ========================================================= */
.eco-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 56px; }
.eco-card { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 32px 30px; box-shadow: 0 14px 40px rgba(20,40,80,0.05); transition: transform 0.3s; }
.eco-card:hover { transform: translateY(-6px); }
.eco-head { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; padding-bottom: 18px; border-bottom: 1px solid var(--border); }
.eco-ico { width: 46px; height: 46px; flex-shrink: 0; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 22px; color: #fff; background: linear-gradient(135deg, var(--navy), var(--navy-soft)); }
.eco-head h3 { font-size: 19px; font-weight: 700; }
.eco-card ul { list-style: none; }
.eco-card li { font-size: 16px; color: var(--gray); padding: 9px 0 9px 20px; position: relative; line-height: 1.6; }
.eco-card li::before { content: ''; position: absolute; left: 0; top: 15px; width: 7px; height: 7px; border-radius: 50%; background: var(--navy); }

/* =========================================================
   PARTICIPATION STEPS
   ========================================================= */
.steps { display: flex; align-items: stretch; gap: 0; margin-top: 60px; }
.step { flex: 1; background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 34px 30px; box-shadow: 0 14px 40px rgba(20,40,80,0.05); }
.step-n { font-family: 'Montserrat', sans-serif; display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 0.1em; color: #fff; background: var(--navy); padding: 5px 14px; border-radius: 100px; margin-bottom: 16px; }
.step h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.step p { font-size: 15.5px; color: var(--gray); line-height: 1.75; }
.step-line { flex: 0 0 44px; align-self: center; height: 2px; background: linear-gradient(90deg, var(--navy), transparent); position: relative; }
.step-line::after { content: '›'; position: absolute; right: 2px; top: -16px; font-size: 26px; color: var(--navy); }

/* =========================================================
   CONTENT — capability + sequence player
   ========================================================= */
.ccap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 52px 0 44px; }
.ccap-item { padding: 24px 26px; border-radius: 14px; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); }
.ccap-item b { display: block; font-size: 17px; font-weight: 700; color: var(--gold-soft); margin-bottom: 8px; }
.ccap-item span { font-size: 14.5px; color: rgba(255,255,255,0.68); line-height: 1.7; }

.seq-player { border: 1px solid rgba(255,255,255,0.12); border-radius: 16px; overflow: hidden; background: #05080f; box-shadow: 0 30px 70px rgba(0,0,0,0.5); }
.seq-screen { position: relative; aspect-ratio: 16/9; overflow: hidden; background: #000; }
.seq-screen img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; opacity: 0; transition: opacity 0.85s cubic-bezier(0.4,0,0.2,1); will-change: opacity; }
.seq-screen img.active { opacity: 1; z-index: 1; }
.seq-info { position: absolute; bottom: 0; left: 0; right: 0; z-index: 2; background: linear-gradient(transparent, rgba(0,0,0,0.88)); padding: 60px 32px 26px; color: #fff; display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; }
.seq-time { font-family: 'Montserrat', sans-serif; font-size: 40px; font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1; }
.seq-label { font-size: 15px; color: rgba(255,255,255,0.78); margin-top: 6px; }
.seq-cycle { font-size: 13px; color: rgba(255,255,255,0.5); white-space: nowrap; padding-bottom: 4px; }
.seq-controls { padding: 18px 28px; display: flex; align-items: center; gap: 16px; border-top: 1px solid rgba(255,255,255,0.07); }
.seq-btn { width: 40px; height: 40px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15); border-radius: 8px; color: #fff; cursor: pointer; font-size: 14px; display: flex; align-items: center; justify-content: center; transition: background 0.2s; }
.seq-btn:hover { background: rgba(255,255,255,0.2); }
.seq-bar { flex: 1; height: 4px; background: rgba(255,255,255,0.12); border-radius: 4px; cursor: pointer; position: relative; }
.seq-fill { height: 100%; border-radius: 4px; background: linear-gradient(90deg, var(--gold), var(--blue)); transition: width 0.6s cubic-bezier(0.4,0,0.2,1); }
.seq-status { font-family: 'Montserrat', sans-serif; font-size: 13px; color: rgba(255,255,255,0.5); white-space: nowrap; }
.seq-thumbs { display: flex; gap: 5px; padding: 12px 28px; background: #03060c; overflow-x: auto; }
.seq-thumb { flex-shrink: 0; width: 78px; height: 50px; border-radius: 5px; overflow: hidden; border: 2px solid transparent; cursor: pointer; transition: border-color 0.25s, opacity 0.25s; opacity: 0.55; }
.seq-thumb:hover { opacity: 0.85; }
.seq-thumb.active { border-color: var(--gold); opacity: 1; }
.seq-thumb img { width: 100%; height: 100%; object-fit: cover; }

/* =========================================================
   SAFETY
   ========================================================= */
.safety-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 56px; }
.safety-item { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 34px 30px; box-shadow: 0 14px 40px rgba(20,40,80,0.05); }
.safety-ico { display: inline-flex; align-items: center; justify-content: center; width: 50px; height: 50px; border-radius: 14px; font-size: 24px; color: var(--navy); background: var(--gray-light); border: 1px solid var(--border); margin-bottom: 16px; }
.safety-item h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.safety-item p { font-size: 15.5px; color: var(--gray); line-height: 1.8; }

/* =========================================================
   BUDGET / WBS PYRAMID
   ========================================================= */
.budget-headline { margin-top: 30px; font-size: 18px; color: var(--charcoal); }
.budget-headline b { color: var(--navy); font-weight: 800; font-size: 22px; }
.budget-headline span { color: var(--gray); font-size: 15px; }
.wbs { margin-top: 40px; display: flex; flex-direction: column; gap: 10px; }
.wbs-row { display: grid; grid-template-columns: 220px 1fr; align-items: center; gap: 0; border-radius: 12px; overflow: hidden; box-shadow: 0 8px 26px rgba(20,40,80,0.07); }
.wbs-k { color: #fff; font-size: 16px; font-weight: 700; padding: 22px 26px; letter-spacing: 0.01em; }
.wbs-v { background: #fff; border: 1px solid var(--border); border-left: none; padding: 22px 26px; font-size: 15.5px; color: var(--gray); line-height: 1.65; }
.wbs-row.w1 .wbs-k { background: var(--navy); }
.wbs-row.w2 .wbs-k { background: #234a86; }
.wbs-row.w3 .wbs-k { background: #2f6df0; }
.wbs-row.w4 .wbs-k { background: linear-gradient(135deg, var(--gold), #c4922f); color: #2a1c00; }
.budget-note { font-size: 14px; color: var(--gray); margin-top: 18px; }

/* =========================================================
   PROCESS
   ========================================================= */
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 56px; }
.proc-step { background: var(--gray-light); border: 1px solid var(--border); border-radius: 16px; padding: 32px 26px; position: relative; transition: transform 0.3s, background 0.3s; }
.proc-step:hover { transform: translateY(-6px); background: #fff; }
.proc-n { width: 52px; height: 52px; border-radius: 14px; background: var(--navy); color: #fff; display: flex; align-items: center; justify-content: center; font-family: 'Montserrat', sans-serif; font-size: 22px; font-weight: 700; margin-bottom: 22px; }
.proc-step h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.proc-step p { font-size: 15px; color: var(--gray); line-height: 1.7; }

/* =========================================================
   PROVEN
   ========================================================= */
.proven-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 1160px; margin: 52px auto 0; padding: 0 44px; }
.proven-item { position: relative; overflow: hidden; border-radius: 16px; }
.proven-item img { width: 100%; height: 420px; object-fit: cover; }
.proven-item figcaption { position: absolute; bottom: 0; left: 0; right: 0; background: rgba(0,0,0,0.55); color: #fff; font-size: 14px; font-weight: 600; letter-spacing: 0.08em; padding: 13px 22px; }

/* =========================================================
   VISION / CONCLUSION
   ========================================================= */
.conclusion { position: relative; overflow: hidden; background: var(--ink); color: #fff; text-align: center; padding: 120px 0 90px; }
.conc-glow { position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 900px; height: 500px; background: radial-gradient(ellipse at center, rgba(216,168,74,0.18), transparent 60%); pointer-events: none; }
.conclusion .container { position: relative; z-index: 2; }
.conc-kicker { font-family: 'Montserrat', sans-serif; font-size: 13px; letter-spacing: 0.3em; color: var(--gold); margin-bottom: 18px; }
.conc-title { font-size: clamp(26px, 4vw, 46px); font-weight: 300; line-height: 1.35; max-width: 820px; margin: 0 auto 48px; }
.conc-title strong { font-weight: 800; display: block; }
.vis-flow { display: flex; align-items: center; justify-content: center; gap: 24px; flex-wrap: wrap; margin-bottom: 50px; }
.vis-node { background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.12); border-radius: 14px; padding: 22px 30px; min-width: 180px; }
.vis-node.catalyst { background: linear-gradient(135deg, rgba(216,168,74,0.18), rgba(77,142,240,0.16)); border-color: rgba(216,168,74,0.4); box-shadow: 0 0 40px rgba(216,168,74,0.2); }
.vis-en { font-family: 'Montserrat', sans-serif; display: block; font-size: 11px; letter-spacing: 0.2em; color: rgba(255,255,255,0.45); margin-bottom: 8px; }
.vis-node b { font-size: 19px; font-weight: 700; display: block; }
.vis-node.catalyst b { color: var(--gold-soft); }
.vis-node em { font-style: normal; font-size: 13px; color: rgba(255,255,255,0.6); display: block; margin-top: 4px; }
.vis-arrow { font-size: 28px; color: rgba(255,255,255,0.4); }
.conc-desc { font-size: 17px; line-height: 1.95; color: rgba(255,255,255,0.72); max-width: 760px; margin: 0 auto 64px; }
.conc-desc b { color: #fff; }
.conc-thanks { font-size: clamp(36px, 6vw, 60px); font-weight: 900; letter-spacing: -0.01em; margin-bottom: 14px; background: linear-gradient(100deg, #fff, #bcd2ff 60%, var(--gold-soft)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.conc-slogan { font-size: 17px; color: rgba(255,255,255,0.6); margin-bottom: 56px; }
.footer-bottom { padding-top: 36px; border-top: 1px solid rgba(255,255,255,0.1); }
.footer-brand { font-family: 'Montserrat', sans-serif; font-size: 18px; font-weight: 700; letter-spacing: 0.08em; }
.footer-brand span { color: var(--gold); margin: 0 6px; }
.footer-sub { font-size: 13px; color: rgba(255,255,255,0.35); margin-top: 10px; letter-spacing: 0.04em; }

/* =========================================================
   SPLASH / LANDING
   ========================================================= */
body.splash-active { overflow: hidden; }
body.splash-active .hero-eyebrow,
body.splash-active .hero-title,
body.splash-active .hero-sub,
body.splash-active .hero-tags,
body.splash-active .hero-scroll { animation-play-state: paused; }

#splash {
  position: fixed; inset: 0; z-index: 2000;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; color: #fff; overflow: hidden;
  background: radial-gradient(ellipse 70% 60% at 50% 45%, #17244e 0%, #0b1020 68%);
  transition: opacity 0.9s ease, visibility 0.9s ease;
}
#splash.hide { opacity: 0; visibility: hidden; pointer-events: none; }
.splash-stars {
  position: absolute; inset: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 22% 28%, rgba(255,255,255,0.7), transparent),
    radial-gradient(1.5px 1.5px at 72% 22%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 42% 72%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1.5px 1.5px at 84% 64%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 32% 86%, rgba(255,255,255,0.45), transparent),
    radial-gradient(1.5px 1.5px at 88% 32%, rgba(255,255,255,0.55), transparent),
    radial-gradient(1px 1px at 12% 56%, rgba(255,255,255,0.5), transparent);
  animation: twinkle 6s ease-in-out infinite alternate;
}
.splash-inner { position: relative; z-index: 2; padding: 0 24px; display: flex; flex-direction: column; align-items: center; }
.splash-eyebrow {
  font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 600;
  letter-spacing: 0.42em; color: var(--gold-soft);
  opacity: 0; animation: splashUp 1s 0.2s forwards;
}
.splash-name {
  font-family: 'Montserrat', sans-serif; font-weight: 800;
  font-size: clamp(32px, 6.4vw, 68px); line-height: 1.12; letter-spacing: 0.01em;
  margin: 20px 0; opacity: 0; animation: splashUp 1.1s 0.45s forwards;
  background: linear-gradient(100deg, #ffffff 12%, #bcd2ff 56%, var(--gold-soft) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.splash-name em { font-style: normal; }
.splash-line { display: block; width: 0; height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--gold), var(--blue)); animation: splashLine 1s 0.95s forwards; }
.splash-sub { font-size: 15px; color: rgba(255,255,255,0.62); margin-top: 18px; letter-spacing: 0.06em; opacity: 0; animation: splashUp 1s 1.15s forwards; }
.splash-skip {
  position: absolute; bottom: 40px; left: 0; right: 0; z-index: 2;
  font-size: 13px; letter-spacing: 0.08em; color: rgba(255,255,255,0.4);
  opacity: 0; animation: splashUp 1s 1.8s forwards, skipPulse 2s 2.8s ease-in-out infinite;
}
@keyframes splashUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@keyframes splashLine { to { width: 96px; } }
@keyframes skipPulse { 0%,100% { opacity: 0.35; } 50% { opacity: 0.75; } }

/* =========================================================
   V2 ADDITIONS
   ========================================================= */

/* --- Summary twin cards as clickable links --- */
a.twin-card { display: block; text-decoration: none; color: inherit; cursor: pointer; transition: transform 0.28s ease, box-shadow 0.28s ease, background 0.28s ease; }
a.twin-card:hover { transform: translateY(-6px); background: rgba(255,255,255,0.08); }
a.twin-gold:hover { box-shadow: 0 18px 50px rgba(216,168,74,0.28), 0 0 0 1px rgba(216,168,74,0.5) inset; }
a.twin-blue:hover { box-shadow: 0 18px 50px rgba(77,142,240,0.28), 0 0 0 1px rgba(77,142,240,0.5) inset; }
.twin-more { display: inline-flex; align-items: center; gap: 7px; margin-top: 16px; font-size: 13.5px; font-weight: 700; letter-spacing: 0.02em; color: rgba(255,255,255,0.85); opacity: 0; transform: translateX(-6px); transition: opacity 0.28s, transform 0.28s; }
.twin-gold .twin-more { color: var(--gold-soft); }
.twin-blue .twin-more { color: #aaccff; }
.twin-more i { font-style: normal; transition: transform 0.28s; }
a.twin-card:hover .twin-more { opacity: 1; transform: translateX(0); }
a.twin-card:hover .twin-more i { transform: translateX(4px); }

/* --- Back-to-summary button (visible on star pages) --- */
.back-summary {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 700; letter-spacing: 0.02em;
  text-decoration: none; color: #fff; margin-bottom: 26px;
  padding: 11px 22px; border-radius: 100px;
  background: rgba(255,255,255,0.07); border: 1px solid rgba(255,255,255,0.28);
  transition: all 0.25s; backdrop-filter: blur(6px);
}
.back-summary:hover { transform: translateX(-4px); }
.back-summary.gold:hover { background: var(--gold); color: #2a1c00; border-color: var(--gold); }
.back-summary.blue:hover { background: var(--blue-deep); color: #fff; border-color: var(--blue-deep); }

/* --- Reference video (star sections) --- */
.ref-video { position: relative; margin: 12px 0 40px; }
.ref-video video {
  display: block; width: 100%; max-height: 620px; object-fit: cover;
  background: #000; box-shadow: 0 30px 70px rgba(0,0,0,0.55);
}
.ref-badge {
  position: absolute; top: 18px; left: 18px; z-index: 2;
  font-family: 'Montserrat', sans-serif; font-size: 11px; font-weight: 700; letter-spacing: 0.18em;
  padding: 6px 14px; border-radius: 100px; color: #0b1020;
}
.ref-badge.gold { background: linear-gradient(90deg, var(--gold), var(--gold-soft)); }
.ref-badge.blue { background: linear-gradient(90deg, var(--blue-deep), var(--blue)); color: #fff; }
.ref-video figcaption { text-align: center; font-size: 14px; color: rgba(255,255,255,0.5); margin-top: 14px; letter-spacing: 0.03em; }

/* --- Evolution venn: dynamic entrance --- */
.evo-venn .venn { opacity: 0; transform: scale(0.3); }
.evo-flow.in .venn { animation: vennPop 0.8s cubic-bezier(0.34,1.56,0.64,1) forwards; }
.evo-flow.in .venn.v1 { animation-delay: 0.10s; }
.evo-flow.in .venn.v2 { animation-delay: 0.30s; }
.evo-flow.in .venn.v3 { animation-delay: 0.50s; }
@keyframes vennPop { 0% { opacity: 0; transform: scale(0.3); } 70% { opacity: 1; } 100% { opacity: 1; transform: scale(1); } }
.evo-flow.in .evo-venn { animation: vennFloat 5s ease-in-out infinite 1.2s; }
@keyframes vennFloat { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-9px); } }
.venn-center { position: absolute; top: 50%; left: 50%; width: 70px; height: 70px; transform: translate(-50%, -50%); border-radius: 50%; pointer-events: none; }
.evo-flow.in .venn-center { animation: centerPulse 2.6s ease-in-out infinite 1s; }
@keyframes centerPulse { 0%,100% { box-shadow: 0 0 0 0 rgba(140,180,255,0); } 50% { box-shadow: 0 0 34px 8px rgba(140,180,255,0.45); } }

/* --- Proven case 01 — 석촌호수 더 스피어 --- */
.case-headline { margin-top: 48px; text-align: center; }
.case-tag { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 0.06em; color: var(--navy); background: var(--navy-light); padding: 6px 16px; border-radius: 100px; margin-bottom: 16px; }
.case-quote { font-size: clamp(24px, 3.4vw, 38px); font-weight: 300; line-height: 1.3; color: var(--charcoal); }
.case-quote b { font-weight: 800; color: var(--navy); }
.case-source { font-size: 15px; color: var(--gray); margin-top: 12px; line-height: 1.7; }
.case-stats { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin-top: 44px; }
.case-stat { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 26px 16px; text-align: center; box-shadow: 0 12px 34px rgba(20,40,80,0.05); }
.cs-num { font-family: 'Montserrat', sans-serif; font-size: clamp(28px, 3.4vw, 40px); font-weight: 800; color: var(--navy); line-height: 1; }
.cs-unit { font-family: 'Montserrat', sans-serif; font-size: 16px; font-weight: 700; color: var(--navy); margin-left: 2px; }
.cs-label { display: block; font-size: 13px; color: var(--gray); margin-top: 12px; line-height: 1.5; }
.case-video { position: relative; width: 100%; padding-bottom: 56.25%; height: 0; overflow: hidden; border-radius: 16px; margin-top: 44px; box-shadow: 0 26px 60px rgba(20,40,80,0.14); background: #000; }
.case-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.case-foot { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; margin-top: 30px; }
.case-note { flex: 1; min-width: 280px; font-size: 15.5px; color: var(--gray); line-height: 1.8; }
.case-link { display: inline-flex; align-items: center; gap: 8px; flex-shrink: 0; background: var(--navy); color: #fff; font-size: 15px; font-weight: 600; padding: 13px 26px; border-radius: 100px; text-decoration: none; transition: background 0.2s, transform 0.2s; }
.case-link:hover { background: #0f2040; transform: translateY(-2px); }

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 1024px) {
  nav { padding: 0 22px; }
  .nav-links { display: none; }
  .nav-menu-btn { display: block; }
  .container { padding: 0 24px; }
  .sec { padding: 80px 0; }
  .dual-grid, .hw-grid { grid-template-columns: 1fr; }
  .tri-grid, .eco-grid, .safety-grid { grid-template-columns: 1fr; }
  .sum-comp { grid-template-columns: 1fr 1fr; }
  .ccap { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr 1fr; }
  .steps { flex-direction: column; gap: 16px; }
  .step-line { display: none; }
  .slider-after img { height: 380px; }
  .proven-grid { padding: 0 24px; }
  .case-stats { grid-template-columns: repeat(3, 1fr); }
  .case-foot { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 680px) {
  body { font-size: 16px; }
  .sec { padding: 64px 0; }
  .sum-inner { padding: 0 22px; }
  .sum-row { grid-template-columns: 1fr; gap: 14px; padding: 26px 0; }
  .sum-tag { width: 90px; }
  .sum-twin { grid-template-columns: 1fr; gap: 12px; }
  .twin-link { transform: rotate(90deg); height: 30px; }
  .sum-comp { grid-template-columns: 1fr 1fr; }
  .evo-flow { flex-direction: column; gap: 24px; }
  .evo-arrow { transform: rotate(90deg); }
  .process-grid { grid-template-columns: 1fr; }
  .proven-grid { grid-template-columns: 1fr; }
  .proven-item img { height: 240px; }
  .wbs-row { grid-template-columns: 1fr; }
  .wbs-v { border-left: 1px solid var(--border); border-top: none; }
  .vis-flow { flex-direction: column; }
  .vis-arrow { transform: rotate(90deg); }
  .slider-after img { height: 280px; }
  .seq-time { font-size: 30px; }
  .seq-cycle { display: none; }
  .case-stats { grid-template-columns: repeat(2, 1fr); }
  .back-summary { font-size: 13px; padding: 10px 18px; }
}