/* ============================================
   WFT26 ConfEx — Design System
   Inspired by official poster
============================================ */

:root {
  /* --- Brand Colors (포스터 추출) --- */
  --navy-deep:   #050d28;
  --navy-base:   #0a1a3a;
  --navy-mid:    #122550;
  --navy-light:  #1d3a73;
  --navy-soft:   #2a4a8c;

  --cyan-soft:   #7dd3d8;
  --cyan-bright: #4fd1d9;

  /* Rainbow ribbon palette */
  --c-pink:      #FF4E8E;
  --c-orange:    #FF8C42;
  --c-yellow:    #FFD93D;
  --c-green:     #6BCB77;
  --c-blue:      #4D96FF;
  --c-purple:    #9D4EDD;

  --gradient-rainbow: linear-gradient(135deg,
    #FF4E8E 0%, #FF8C42 20%, #FFD93D 40%,
    #6BCB77 60%, #4D96FF 80%, #9D4EDD 100%);

  --gradient-bg: linear-gradient(180deg,
    #050d28 0%, #0a1a3a 30%, #122550 70%, #0a1a3a 100%);

  /* --- Layout --- */
  --max-w: 1280px;
  --pad-x: clamp(20px, 4vw, 48px);

  /* --- Typography --- */
  --font-display: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body:    'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;

  /* --- Misc --- */
  --radius: 12px;
  --radius-lg: 20px;
  --easing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================ Reset ============================================ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 400;
  color: #fff;
  background: var(--navy-deep);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: opacity .2s; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; padding: 0; margin: 0; }
h1, h2, h3, h4, h5 { margin: 0; font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
p { margin: 0; }

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

/* ============================================ Header ============================================ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(5, 13, 40, 0.0);
  backdrop-filter: blur(0px);
  transition: background .35s var(--easing), backdrop-filter .35s var(--easing), padding .35s var(--easing);
  padding: 18px 0;
}
.site-header.scrolled {
  background: rgba(5, 13, 40, 0.88);
  backdrop-filter: blur(16px);
  padding: 12px 0;
  border-bottom: 1px solid rgba(125, 211, 216, 0.1);
}
.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800;
}
.brand-mark svg { display: block; height: 24px; width: auto; }
.brand-mark-img { display: flex; align-items: center; }
.brand-mark-img img {
  display: block;
  height: 30px;
  width: auto;
  object-fit: contain;
}
.brand-text {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #fff;
  line-height: 1;
}

/* GNB */
.gnb { display: flex; }
.gnb > ul { display: flex; gap: 4px; }
.gnb > ul > li {
  position: relative;
}
.gnb > ul > li > a {
  display: inline-block;
  padding: 12px 18px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  position: relative;
}
.gnb > ul > li > a::after {
  content: '';
  position: absolute;
  left: 18px; right: 18px; bottom: 6px;
  height: 2px;
  background: var(--gradient-rainbow);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s var(--easing);
}
.gnb > ul > li:hover > a::after { transform: scaleX(1); }
.gnb .sub {
  position: absolute;
  top: 100%; left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 180px;
  background: rgba(10, 26, 58, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(125, 211, 216, 0.15);
  border-radius: var(--radius);
  padding: 8px;
  opacity: 0; visibility: hidden;
  transition: all .25s var(--easing);
  box-shadow: 0 20px 50px rgba(0,0,0,0.4);
}
.gnb > ul > li:hover .sub {
  opacity: 1; visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.gnb .sub li a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  border-radius: 8px;
  color: rgba(255,255,255,0.8);
  transition: all .2s;
}
.gnb .sub li a:hover {
  background: rgba(125, 211, 216, 0.1);
  color: #fff;
  padding-left: 18px;
}

/* Header Utils */
.header-utils { display: flex; align-items: center; gap: 16px; }
.lang { display: flex; align-items: center; gap: 6px; font-size: 13px; }
.lang-btn {
  padding: 4px 8px;
  color: rgba(255,255,255,0.5);
  font-weight: 600;
  transition: color .2s;
}
.lang-btn.active, .lang-btn:hover { color: #fff; }
.lang span { color: rgba(255,255,255,0.3); }

.hamburger { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: #fff; border-radius: 2px;
  transition: all .3s;
}

/* ============================================ Buttons ============================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px;
  font-weight: 600;
  font-size: 14px;
  border-radius: 100px;
  transition: all .25s var(--easing);
  white-space: nowrap;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary {
  background: var(--gradient-rainbow);
  background-size: 200% 100%;
  background-position: 0% 50%;
  color: #fff;
  font-weight: 700;
  box-shadow: 0 8px 25px rgba(255, 78, 142, 0.25), 0 4px 12px rgba(77, 150, 255, 0.2);
}
.btn-primary:hover {
  background-position: 100% 50%;
  transform: translateY(-2px);
  box-shadow: 0 12px 35px rgba(255, 78, 142, 0.35), 0 6px 18px rgba(77, 150, 255, 0.3);
}
.btn-ghost {
  background: transparent;
  border-color: rgba(125, 211, 216, 0.4);
  color: var(--cyan-soft);
}
.btn-ghost:hover {
  border-color: var(--cyan-soft);
  background: rgba(125, 211, 216, 0.08);
  color: #fff;
}
.btn-lg { padding: 16px 32px; font-size: 16px; }
.btn-xl { padding: 20px 44px; font-size: 17px; }

.btn-register-header { padding: 10px 18px; font-size: 13px; }

/* ============================================ HERO ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 140px 0 80px;
  overflow: hidden;
  background: var(--gradient-bg);
}
.hero-bg {
  position: absolute; inset: 0;
  pointer-events: none;
}
.hero-dots {
  position: absolute; inset: 0;
  background-image: radial-gradient(circle, rgba(125, 211, 216, 0.15) 1px, transparent 1px);
  background-size: 30px 30px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  opacity: 0.6;
}
.hero-glow {
  position: absolute;
  top: 30%; left: 50%; transform: translate(-50%, -50%);
  width: 800px; height: 800px;
  background: radial-gradient(circle, rgba(77, 150, 255, 0.18) 0%, transparent 60%);
  filter: blur(40px);
}
.hero-ribbon {
  position: absolute;
  top: 50%; left: 50%;
  width: 130%; height: 100%;
  transform: translate(-50%, -50%) rotate(-3deg);
  opacity: 0.7;
}

/* 메인 hero의 원형 심볼 (포스터 공식 디자인) */
.hero-symbol {
  position: absolute;
  top: 50%;
  right: -10%;
  transform: translateY(-50%);
  width: 65%;
  max-width: 950px;
  pointer-events: none;
  opacity: 0.92;
  z-index: 1;
}
.hero-symbol img {
  display: block;
  width: 100%;
  height: auto;
  filter: drop-shadow(0 20px 60px rgba(77, 150, 255, 0.25));
}
@media (max-width: 1200px) {
  .hero-symbol {
    width: 55%;
    right: -10%;
    opacity: 0.75;
  }
}
@media (max-width: 1024px) {
  .hero-symbol {
    width: 80%;
    right: -20%;
    opacity: 0.45;
  }
}
@media (max-width: 768px) {
  .hero-symbol {
    width: 130%;
    right: -30%;
    top: auto;
    bottom: -15%;
    transform: none;
    opacity: 0.3;
  }
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  width: 100%;
}
.hero-eyebrow {
  font-size: clamp(11px, 1.2vw, 14px);
  font-weight: 500;
  letter-spacing: 0.4em;
  color: var(--cyan-soft);
  margin-bottom: 32px;
  text-transform: uppercase;
  background: linear-gradient(90deg, #6BCB77, #FFD93D, #FF4E8E, #4D96FF, #9D4EDD);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shimmer 6s linear infinite;
}
@keyframes shimmer {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}
.hero-title {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
}
.hero-title .line {
  display: block;
  opacity: 0;
  transform: translateY(20px);
  animation: lineIn .8s var(--easing) forwards;
}
.hero-title .line:nth-child(1) { animation-delay: .1s; }
.hero-title .line:nth-child(2) { animation-delay: .25s; }
.hero-title .line:nth-child(3) { animation-delay: .4s; }
.hero-title .accent {
  background: var(--gradient-rainbow);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
@keyframes lineIn {
  to { opacity: 1; transform: translateY(0); }
}
.hero-tagline {
  font-size: clamp(15px, 1.8vw, 19px);
  color: rgba(255,255,255,0.7);
  font-style: italic;
  font-weight: 300;
  margin-bottom: 56px;
  letter-spacing: 0.01em;
  opacity: 0;
  animation: lineIn .8s var(--easing) forwards .55s;
}

.hero-meta {
  display: flex; align-items: center; gap: 28px;
  padding: 24px 0;
  border-top: 1px solid rgba(125, 211, 216, 0.2);
  border-bottom: 1px solid rgba(125, 211, 216, 0.2);
  margin-bottom: 40px;
  flex-wrap: wrap;
  opacity: 0;
  animation: lineIn .8s var(--easing) forwards .7s;
}
.meta-item { display: flex; flex-direction: column; gap: 6px; }
.meta-label {
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--cyan-soft);
  font-weight: 600;
}
.meta-value {
  font-size: clamp(17px, 1.8vw, 22px);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.meta-value small {
  font-size: 0.65em;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  margin-left: 2px;
}
.meta-divider {
  width: 1px; height: 36px;
  background: rgba(125, 211, 216, 0.25);
}

.hero-cta {
  display: flex; gap: 14px; flex-wrap: wrap;
  margin-bottom: 64px;
  opacity: 0;
  animation: lineIn .8s var(--easing) forwards .85s;
}

.hero-countdown {
  display: flex; gap: 12px;
  opacity: 0;
  animation: lineIn .8s var(--easing) forwards 1s;
}
.cd-box {
  background: rgba(125, 211, 216, 0.06);
  border: 1px solid rgba(125, 211, 216, 0.2);
  backdrop-filter: blur(10px);
  border-radius: var(--radius);
  padding: 14px 20px;
  min-width: 88px;
  text-align: center;
  display: flex; flex-direction: column; gap: 4px;
}
.cd-num {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  line-height: 1;
  color: #fff;
  font-variant-numeric: tabular-nums;
}
.cd-label {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--cyan-soft);
  font-weight: 600;
}

.scroll-down {
  position: absolute;
  bottom: 30px; left: 50%; transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid rgba(125, 211, 216, 0.4);
  border-radius: 100px;
  display: flex; justify-content: center; padding-top: 8px;
  z-index: 3;
}
.scroll-down span {
  width: 3px; height: 8px;
  background: var(--cyan-soft);
  border-radius: 2px;
  animation: scrollDot 1.8s var(--easing) infinite;
}
@keyframes scrollDot {
  0% { opacity: 0; transform: translateY(-4px); }
  50% { opacity: 1; }
  100% { opacity: 0; transform: translateY(14px); }
}

/* ============================================ Sections ============================================ */
.section {
  padding: clamp(80px, 12vw, 140px) 0;
  position: relative;
}
.section-head {
  margin-bottom: clamp(40px, 6vw, 72px);
  max-width: 720px;
}
.section-head-row {
  display: flex; justify-content: space-between; align-items: flex-end; gap: 24px;
  max-width: 100%;
  flex-wrap: wrap;
}
.section-eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--cyan-soft);
  margin-bottom: 18px;
  text-transform: uppercase;
  padding-left: 24px;
  position: relative;
}
.section-eyebrow::before {
  content: '';
  position: absolute;
  left: 0; top: 50%; transform: translateY(-50%);
  width: 14px; height: 2px;
  background: var(--gradient-rainbow);
}
.section-title {
  font-size: clamp(28px, 4.5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.more-link {
  font-size: 14px;
  color: var(--cyan-soft);
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: gap .2s, color .2s;
  display: inline-flex; gap: 6px; align-items: center;
}
.more-link:hover { color: #fff; gap: 12px; }

/* ============================================ About Event ============================================ */
.section-about {
  background:
    radial-gradient(ellipse 80% 60% at 20% 20%, rgba(157, 78, 221, 0.08), transparent),
    radial-gradient(ellipse 80% 60% at 80% 80%, rgba(77, 150, 255, 0.08), transparent),
    var(--navy-deep);
}
.about-body { max-width: 800px; }
.about-lead {
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.85;
  color: rgba(255,255,255,0.88);
  font-weight: 400;
  margin-bottom: 56px;
}
.about-lead strong { font-weight: 700; color: var(--cyan-soft); }
.about-lead em {
  font-style: normal;
  font-weight: 800;
  background: var(--gradient-rainbow);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.signature {
  border-left: 3px solid;
  border-image: var(--gradient-rainbow) 1;
  padding: 8px 0 8px 24px;
}
.sig-role {
  font-size: 14px;
  color: var(--cyan-soft);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  font-weight: 600;
}
.sig-name {
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 800;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}
.sig-note {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
}
.sig-note strong { color: #fff; letter-spacing: 0.05em; }

/* ============================================ Numbers ============================================ */
.section-numbers {
  background: var(--navy-base);
  padding: clamp(60px, 8vw, 100px) 0;
}
.numbers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: rgba(125, 211, 216, 0.12);
  border: 1px solid rgba(125, 211, 216, 0.12);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.num-card {
  background: var(--navy-base);
  padding: 40px 32px;
  display: flex; flex-direction: column; gap: 8px;
  transition: background .35s;
  position: relative;
}
.num-card:hover { background: var(--navy-mid); }
.num-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient-rainbow);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .4s var(--easing);
}
.num-card:hover::after { transform: scaleX(1); }
.num-value {
  font-size: clamp(48px, 6vw, 72px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  background: var(--gradient-rainbow);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: flex; align-items: baseline; gap: 8px;
  margin-bottom: 8px;
}
.num-value span {
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan-soft);
  letter-spacing: 0.05em;
  -webkit-text-fill-color: var(--cyan-soft);
}
.num-label {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.num-desc {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  line-height: 1.6;
  margin-top: 4px;
}

/* ============================================ Program ============================================ */
.section-program {
  background:
    radial-gradient(ellipse 60% 50% at 80% 30%, rgba(255, 78, 142, 0.06), transparent),
    radial-gradient(ellipse 60% 50% at 20% 70%, rgba(107, 203, 119, 0.06), transparent),
    var(--navy-deep);
}
.program-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.prog-card {
  display: block;
  padding: 36px 32px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(125, 211, 216, 0.2);
  background: linear-gradient(180deg, rgba(125, 211, 216, 0.04), rgba(125, 211, 216, 0.01));
  position: relative;
  overflow: hidden;
  transition: transform .35s var(--easing), border-color .35s;
  min-height: 280px;
  display: flex; flex-direction: column;
}
.prog-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-rainbow);
  opacity: 0;
  z-index: -1;
  transition: opacity .35s;
  filter: blur(40px);
}
.prog-card:hover {
  transform: translateY(-6px);
  border-color: rgba(125, 211, 216, 0.4);
}
.prog-card:hover::before { opacity: 0.12; }
.prog-num {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.4);
  margin-bottom: 16px;
}
.prog-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.prog-en {
  font-size: 14px;
  color: var(--cyan-soft);
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.prog-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255,255,255,0.75);
  margin-bottom: auto;
  padding-bottom: 24px;
}
.prog-cta {
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan-soft);
  display: inline-flex;
  letter-spacing: -0.01em;
}

/* 카드별 그라데이션 액센트 */
.prog-card-1 .prog-num { color: var(--c-pink); }
.prog-card-2 .prog-num { color: var(--c-yellow); }
.prog-card-3 .prog-num { color: var(--c-blue); }

/* ============================================ Organizer ============================================ */
.section-organizer {
  background: var(--navy-base);
}
.organizer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.org-card {
  padding: 40px 32px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(125, 211, 216, 0.15);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all .3s;
}
.org-card:hover {
  background: rgba(255,255,255,0.04);
  border-color: rgba(125, 211, 216, 0.3);
}
.org-mark {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: var(--gradient-rainbow);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 20px;
}
.org-mark sup { font-size: 0.5em; }
.org-mark-text { letter-spacing: 0.05em; }
.org-mark-logo {
  background: none;
  -webkit-background-clip: initial;
  background-clip: initial;
  color: initial;
  height: 96px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}
.org-mark-logo img {
  max-height: 96px;
  max-width: 80%;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: brightness(1.05);
}
.org-name {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.org-en {
  font-size: 12px;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.02em;
}
.org-role {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(125, 211, 216, 0.15);
  font-size: 12px;
  color: var(--cyan-soft);
  letter-spacing: 0.1em;
  font-weight: 600;
}

/* ============================================ CTA Section ============================================ */
.section-cta {
  padding: clamp(80px, 10vw, 120px) 0;
  background: var(--navy-deep);
  position: relative;
  overflow: hidden;
  text-align: center;
}
.cta-bg {
  position: absolute; inset: 0;
  z-index: 0;
  pointer-events: none;
}
.cta-bg svg { width: 100%; height: 100%; display: block; }
.cta-inner {
  position: relative;
  z-index: 1;
  text-align: center;
}
.cta-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(255, 78, 142, 0.15);
  border: 1px solid rgba(255, 78, 142, 0.4);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: #FF4E8E;
  margin-bottom: 24px;
}
.cta-title {
  font-size: clamp(28px, 4.5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}
.cta-desc {
  font-size: 15px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 40px;
}

/* ============================================ Footer ============================================ */
.site-footer {
  background: #03081c;
  padding-top: 80px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 48px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(125, 211, 216, 0.1);
}
.footer-brand .footer-logo {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.04em;
  display: flex; gap: 4px; align-items: baseline;
  margin-bottom: 16px;
}
.footer-26 {
  background: var(--gradient-rainbow);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.footer-tagline {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
}
.footer-col h4 {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan-soft);
  margin-bottom: 20px;
  font-weight: 600;
}
.footer-col ul li {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 12px;
  line-height: 1.6;
}
.footer-col ul li a { transition: color .2s; }
.footer-col ul li a:hover { color: #fff; }

.footer-bottom {
  padding: 28px 0;
  font-size: 12px;
  color: rgba(255,255,255,0.45);
}
.footer-bottom .container {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px;
}
.footer-sponsors {
  display: flex; gap: 14px; align-items: center; flex-wrap: wrap;
}
.footer-sponsors span:first-child {
  color: var(--cyan-soft);
  letter-spacing: 0.1em;
  font-weight: 600;
}
.footer-logo-img {
  background: none !important;
  -webkit-background-clip: initial !important;
  background-clip: initial !important;
  color: initial !important;
  padding: 0 !important;
}
.footer-logo-img img {
  display: block;
  height: 56px;
  width: auto;
  object-fit: contain;
}

/* ============================================ Responsive ============================================ */
@media (max-width: 1024px) {
  /* 데스크탑 GNB 숨김 → 모바일 슬라이드 패널 */
  .hamburger { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; }

  /* ===== 모바일 GNB 패널 ===== */
  .gnb {
    display: block;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(85vw, 360px);
    background: linear-gradient(180deg, #0a1a3a 0%, #050d28 100%);
    border-left: 1px solid rgba(125, 211, 216, 0.15);
    padding: 88px 0 32px;
    overflow-y: auto;
    overflow-x: hidden;
    transform: translateX(105%);
    transition: transform .35s var(--easing);
    z-index: 2000;
    box-shadow: -20px 0 60px rgba(0,0,0,0.5);
    -webkit-overflow-scrolling: touch;
  }
  .gnb.is-open { transform: translateX(0); }

  .gnb > ul {
    display: block;
    gap: 0;
    padding: 0;
    margin: 0;
  }
  .gnb > ul > li {
    position: relative;
    border-bottom: 1px solid rgba(125, 211, 216, 0.08);
  }
  .gnb > ul > li > a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 28px;
    font-size: 17px;
    font-weight: 600;
    color: #fff;
    width: 100%;
    position: relative;
  }
  .gnb > ul > li > a::before {
    content: '';
    position: absolute;
    right: 28px;
    top: 50%;
    width: 9px;
    height: 9px;
    border-right: 2px solid rgba(255,255,255,0.5);
    border-bottom: 2px solid rgba(255,255,255,0.5);
    transform: translateY(-75%) rotate(45deg);
    transition: transform .25s var(--easing);
  }
  .gnb > ul > li.has-sub-open > a::before {
    transform: translateY(-25%) rotate(-135deg);
    border-color: var(--cyan-soft);
  }
  .gnb > ul > li > a::after { display: none; }

  .gnb .sub {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: none;
    border: none;
    border-radius: 0;
    box-shadow: none;
    padding: 0;
    min-width: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s var(--easing);
  }
  .gnb > ul > li.has-sub-open .sub {
    max-height: 500px;
    padding: 8px 0 16px;
  }
  .gnb > ul > li:hover .sub { transform: none; }
  .gnb .sub li a {
    padding: 12px 28px 12px 48px;
    font-size: 14.5px;
    color: rgba(255,255,255,0.75);
    border-radius: 0;
    position: relative;
  }
  .gnb .sub li a::before {
    content: '';
    position: absolute;
    left: 32px;
    top: 50%;
    width: 8px;
    height: 1px;
    background: rgba(125, 211, 216, 0.4);
    transform: translateY(-50%);
  }
  .gnb .sub li a:hover,
  .gnb .sub li a:active {
    background: rgba(125, 211, 216, 0.08);
    color: #fff;
    padding-left: 52px;
  }

  /* ===== 햄버거 X 변환 + body 직속 fixed ===== */
  .hamburger {
    position: fixed;
    top: 22px;
    right: 16px;
    z-index: 2010;
    width: 40px;
    height: 40px;
    justify-content: center;
    align-items: center;
    background: transparent;
    border: 0;
    cursor: pointer;
  }
  .site-header.scrolled ~ .hamburger,
  body.scrolled .hamburger {
    top: 16px;
  }
  .hamburger span {
    transition: transform .3s var(--easing), opacity .2s, top .3s var(--easing);
  }
  .hamburger.is-active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .hamburger.is-active span:nth-child(2) {
    opacity: 0;
  }
  .hamburger.is-active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* ===== 모바일 백드롭 ===== */
  .mobile-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(5, 13, 40, 0.6);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s, visibility .3s;
    z-index: 1950;
  }
  .mobile-backdrop.is-visible {
    opacity: 1;
    visibility: visible;
  }

  body.no-scroll {
    overflow: hidden;
    touch-action: none;
  }

  .site-header { z-index: 1980; }

  body.no-scroll .popup,
  body.no-scroll .popup-backdrop,
  body.no-scroll .popup-center-stage {
    visibility: hidden;
    pointer-events: none;
  }
}

@media (max-width: 768px) {
  .hero { padding: 120px 0 60px; min-height: auto; }
  .hero-meta { flex-direction: column; align-items: flex-start; gap: 18px; }
  .meta-divider { display: none; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { width: 100%; }
  .hero-countdown { gap: 8px; }
  .cd-box { padding: 10px 14px; min-width: 0; flex: 1; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .btn-register-header { display: none; }

  /* 모바일에서 organizer 카드 정렬 */
  .organizer-grid { grid-template-columns: 1fr; gap: 16px; }
  .org-card { padding: 32px 24px; }
  .org-mark-logo { height: 80px; }
  .org-mark-logo img { max-height: 80px; }

  /* 모바일 헤더 최적화 */
  .header-inner { padding: 10px var(--pad-x); padding-right: 64px; }
  .brand-text { font-size: 18px; }
  .brand-mark-img img { height: 26px; }
  .lang { font-size: 12px; }
  .header-utils { gap: 10px; }

  .section { padding: 56px 0; }
  .section-title { font-size: clamp(24px, 6vw, 32px); }

  .program-grid-venues { grid-template-columns: 1fr; gap: 16px; }
  .prog-card { padding: 24px 20px; }

  .numbers-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .num-card { padding: 20px 14px; }
  .num-value { font-size: clamp(28px, 7vw, 36px); }

  .signature { padding: 24px 16px; }
  .sig-name { font-size: 18px; }

  .cta-title { font-size: clamp(22px, 5.5vw, 28px); }
  .btn-xl { width: 100%; }

  .footer-sponsors { flex-wrap: wrap; gap: 8px 12px; font-size: 12px; }

  .btn { min-height: 44px; }
  .hamburger { min-width: 44px; min-height: 44px; }
  a, button { -webkit-tap-highlight-color: rgba(125, 211, 216, 0.15); }
}

/* ===== Scroll reveal helper ===== */
.reveal { opacity: 1; transform: none; }
html.js-ready .reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s var(--easing), transform .7s var(--easing);
}
html.js-ready .reveal.in {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  html.js-ready .reveal { opacity: 1; transform: none; transition: none; }
}