/* =============================================
   COMVILLAIN Design System
   Dark · Zinc-950 · Cyan-500 · Pretendard
   ============================================= */

:root {
  /* Background — Light mode defaults */
  --cv-bg:        #ffffff;
  --cv-bg-2:      #f8fafc;
  --cv-bg-3:      #f1f5f9;
  --cv-surface:   #ffffff;

  /* Card / Surface tokens */
  --cv-card-bg:     rgba(0, 0, 0, 0.035);
  --cv-card-bg-2:   rgba(0, 0, 0, 0.06);
  --cv-card-border: rgba(0, 0, 0, 0.09);
  --cv-divider-c:   rgba(0, 0, 0, 0.07);
  --cv-overlay:     rgba(255, 255, 255, 0.95);
  --cv-overlay-2:   rgba(255, 255, 255, 0.99);

  /* Border */
  --cv-border:    rgba(0, 0, 0, 0.09);
  --cv-border-2:  rgba(0, 0, 0, 0.14);

  /* Accent — Cyan */
  --cv-accent:       #06b6d4;
  --cv-accent-dark:  #0891b2;
  --cv-accent-light: #0e7490;
  --cv-accent-glow:  rgba(6, 182, 212, 0.12);

  /* Text */
  --cv-text:   #09090b;
  --cv-text-2: #3f3f46;
  --cv-text-3: #71717a;

  /* Status */
  --cv-success: #059669;
  --cv-warning: #d97706;
  --cv-error:   #dc2626;

  /* Backward compatibility */
  --color-primary:        var(--cv-accent);
  --color-primary-dark:   var(--cv-accent-dark);
  --color-bg:             var(--cv-bg);
  --color-bg-secondary:   var(--cv-bg-2);
  --color-bg-tertiary:    var(--cv-bg-3);
  --color-text:           var(--cv-text);
  --color-text-secondary: var(--cv-text-2);
  --color-text-tertiary:  var(--cv-text-3);
  --color-border:         var(--cv-border);
  --color-border-light:   var(--cv-border-2);
  --color-success:        var(--cv-success);
  --color-warning:        var(--cv-warning);
  --color-error:          var(--cv-error);

  /* Shadows */
  --shadow-sm:   0 1px 3px rgba(0, 0, 0, 0.07);
  --shadow-md:   0 4px 12px rgba(0, 0, 0, 0.09);
  --shadow-lg:   0 8px 28px rgba(0, 0, 0, 0.11);
  --shadow-xl:   0 16px 48px rgba(0, 0, 0, 0.15);
  --shadow-card: 0 1px 0 rgba(255, 255, 255, 0.9) inset, 0 2px 10px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 40px var(--cv-accent-glow);

  /* Typography */
  --font-display: 'Paperlogy', 'Pretendard', system-ui, sans-serif;
  --font-body:    'Pretendard', system-ui, -apple-system, sans-serif;
  --font-family:  var(--font-body);

  /* Spacing */
  --spacing-xs:  0.5rem;
  --spacing-sm:  1rem;
  --spacing-md:  1.5rem;
  --spacing-lg:  2rem;
  --spacing-xl:  3rem;
  --spacing-2xl: 5rem;

  /* Radius */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --radius-2xl: 32px;

  /* Transition */
  --transition:        all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);

  --gradient-primary: linear-gradient(135deg, var(--cv-accent) 0%, var(--cv-accent-dark) 100%);
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--cv-bg);
  color: var(--cv-text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  word-break: keep-all;
  overflow-x: hidden;
}

/* Grain texture */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9998;
  pointer-events: none;
  opacity: 0.022;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  background-size: 180px;
}

a    { text-decoration: none; color: inherit; transition: var(--transition); }
img  { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }
ul, ol { list-style: none; }

/* ─── Container ─── */
.alpha-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
@media (min-width: 768px) { .alpha-container { padding: 0 2rem; } }

/* ─── Typography helpers ─── */
.cv-display {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  word-break: keep-all;
}
.cv-heading {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  word-break: keep-all;
}
.cv-body { font-size: 1.0625rem; color: var(--cv-text-2); line-height: 1.75; word-break: keep-all; }
.cv-caption { font-size: 0.875rem; color: var(--cv-text-3); }

/* ─── Glass card ─── */
.cv-glass {
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--cv-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}
.cv-glass:hover {
  border-color: var(--cv-border-2);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  transition: var(--transition-spring);
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.375rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: var(--font-body);
  transition: var(--transition-spring);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--cv-accent);
  color: #09090b;
}
.btn-primary:hover {
  background: var(--cv-accent-light);
  transform: scale(1.02);
  box-shadow: 0 8px 24px var(--cv-accent-glow);
}
.btn-primary:active { transform: scale(0.98); }

.btn-outline {
  background: transparent;
  color: var(--cv-text);
  border: 1px solid var(--cv-border-2);
}
.btn-outline:hover {
  border-color: var(--cv-accent);
  color: var(--cv-accent);
  background: var(--cv-accent-glow);
  transform: scale(1.02);
}

.btn-ghost {
  background: var(--cv-card-bg);
  color: var(--cv-text-2);
  border: 1px solid var(--cv-border);
}
.btn-ghost:hover {
  background: var(--cv-card-bg-2);
  color: var(--cv-text);
}

.btn-large  { padding: 0.875rem 2rem; font-size: 1.0625rem; }
.btn-sm     { padding: 0.4375rem 0.875rem; font-size: 0.8125rem; }

/* ─── Accent badge / tag ─── */
.cv-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 600;
  background: var(--cv-accent-glow);
  color: var(--cv-accent-light);
  border: 1px solid rgba(6,182,212,0.25);
}

/* ─── Section commons ─── */
.cv-section {
  padding: 100px 0;
}
.cv-section-sm { padding: 64px 0; }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3125rem 0.875rem;
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--cv-accent-glow);
  color: var(--cv-accent);
  border: 1px solid rgba(6,182,212,0.2);
  margin-bottom: 1.25rem;
}

.section-title-lg {
  font-family: var(--font-display);
  font-size: clamp(1.875rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--cv-text);
  word-break: keep-all;
  margin-bottom: 1rem;
}
.section-title-lg span { color: var(--cv-accent); }

.section-desc {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--cv-text-2);
  line-height: 1.75;
  max-width: 56ch;
  word-break: keep-all;
}

/* ─── Scroll reveal — 항상 보임 (JS 의존 없음) ─── */
.reveal {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.16,1,0.3,1);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ─── Divider ─── */
.cv-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cv-border-2), transparent);
}

/* ─── Main wrapper padding for fixed header ─── */
.main-wrapper {
  padding-top: 72px;
}
/* 히어로 캐러셀 페이지: body margin + wrapper padding 모두 제거 → 캐러셀 y=0 시작 */
body.cv-hero-page {
  margin-top: 0 !important;
}
body.cv-hero-page .main-wrapper {
  padding-top: 0 !important;
}

/* ─── Gnuboard overrides ─── */
#hd_login_msg {
  display: none;
}

/* ─── Responsive utilities ─── */
@media (max-width: 768px) {
  .cv-section   { padding: 64px 0; }
  .cv-section-sm{ padding: 40px 0; }
  .section-title-lg { font-size: clamp(1.625rem, 6vw, 2.25rem); }
}