/* ══════════════════════════════════════════
   frame.css · ccyr.studio shared base
   ══════════════════════════════════════════ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; line-height: 1.5; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; background: none; border: none; color: inherit; }

/* ── DESIGN TOKENS ──────────────────────── */
:root {
  --font-sans: 'Inter', 'SUIT Variable', 'SUIT', system-ui, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --font-kr:   'SUIT Variable', 'Inter', system-ui, sans-serif;

  --color-black:          #000000;
  --color-white:          #ffffff;
  --color-off-black:      #1a1a1a;
  --color-off-black-05:   rgba(26, 26, 26, 0.05);
  --color-off-black-10:   rgba(26, 26, 26, 0.10);
  --color-off-black-30:   rgba(26, 26, 26, 0.30);
  --color-off-black-50:   rgba(26, 26, 26, 0.50);
  --color-off-black-60:   rgba(26, 26, 26, 0.63);
  --color-white-20:       rgba(255, 255, 255, 0.20);
  --color-white-60:       rgba(255, 255, 255, 0.60);
  --color-warm-grey:      #f3f3f0;
  --color-warm-grey-dark: #ecece8;
  --color-grey-dark:      #e6e6e6;

  --color-blue:       #274f7b;
  --color-blue-deep:  #1d3a5c;
  --color-blue-soft:  #e8eef4;
  --color-blue-ultra: #f3f6fa;

  --color-coral: #dc7055;
  --color-olive: #c9c85a;
  --color-grass: #79d15e;

  --color-accent:            var(--color-blue);
  --color-accent-hover:      var(--color-blue-deep);
  --color-accent-tint:       var(--color-blue-ultra);
  --color-primary:           var(--color-off-black);
  --color-secondary:         var(--color-off-black-60);
  --color-bg:                var(--color-white);
  --color-surface:           var(--color-warm-grey);
  --color-surface-secondary: var(--color-warm-grey-dark);
  --color-border:            var(--color-off-black-10);

  --color-nav-bg:           var(--color-white);
  --color-nav-border:       var(--color-off-black-10);
  --color-nav-primary:      var(--color-off-black);
  --color-nav-secondary:    var(--color-off-black-50);
  --color-nav-button-hover: var(--color-off-black-05);

  --text-2xs:  0.625rem;
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.75rem;
  --text-4xl:  2rem;
  --text-5xl:  2.25rem;
  --text-6xl:  2.625rem;
  --text-7xl:  3rem;
  --text-8xl:  3.5rem;

  --spacing:      0.25rem;
  --radius-xs:    0.125rem;
  --radius-sm:    0.25rem;
  --radius-md:    0.375rem;
  --radius-lg:    0.5rem;
  --radius-xl:    0.75rem;
  --radius-2xl:   1rem;
  --radius-full:  9999px;

  --container-2xl: 42rem;
  --container-6xl: 72rem;

  --nav-height:      60px;
  --nav-pill-radius: var(--radius-xl);

  --tracking-tight:  -0.025em;
  --tracking-normal:  0em;
  --tracking-wide:    0.025em;

  --menu-width-closed: 100%;
  --menu-width-open:   100%;

  --t-colors:   200ms cubic-bezier(0.4, 0, 0.2, 1);
  --t-sections: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}
@media (min-width: 640px)  { :root { --menu-width-closed: 330px; --menu-width-open: 50vw; } }
@media (min-width: 768px)  { :root { --menu-width-open: 70vw; } }
@media (min-width: 1280px) { :root { --menu-width-open: 50vw; } }

html, body { background: var(--color-bg); }
body { font-family: var(--font-sans); font-size: var(--text-base); color: var(--color-primary); }
main { padding: 0; }

/* ── NAV ────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0; right: 0; left: 0;
  z-index: 50;
  padding: calc(var(--spacing) * 4);
  pointer-events: none;
}
@media (min-width: 768px) { .site-header { padding: calc(var(--spacing) * 6); } }

.nav-overlay {
  position: fixed; inset: 0; z-index: 40;
  background: rgba(0, 0, 0, 0.5);
  transition: opacity var(--t-sections), visibility var(--t-sections);
  visibility: hidden; opacity: 0; pointer-events: none;
}
.nav-overlay.open { visibility: visible; opacity: 1; pointer-events: auto; }

.nav-pill {
  pointer-events: auto;
  position: relative;
  max-width: var(--container-6xl);
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid var(--color-nav-border);
  background: var(--color-nav-bg);
  color: var(--color-nav-primary);
  border-radius: var(--nav-pill-radius);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  width: var(--menu-width-closed);
  height: var(--nav-height);
  transition:
    width  400ms cubic-bezier(0.34, 1.56, 0.64, 1),
    height 400ms cubic-bezier(0.34, 1.56, 0.64, 1),
    background-color 200ms ease;
}
.nav-pill.open { width: var(--menu-width-open); height: auto; min-height: 340px; }
@media (max-width: 639px) {
  .nav-pill.open {
    animation: mobilePillOpen 400ms cubic-bezier(0.22, 1.6, 0.58, 1) both;
    transform-origin: top center;
  }
}
@keyframes mobilePillOpen {
  0%   { transform: scaleY(0.75) scaleX(0.96); opacity: 0.6; }
  50%  { transform: scaleY(1.06) scaleX(1.01); opacity: 1; }
  100% { transform: scaleY(1) scaleX(1); opacity: 1; }
}
.nav-pill.closing .nav-menu { opacity: 0 !important; pointer-events: none !important; transition: opacity 160ms ease !important; }
.nav-pill.closing { min-height: 0 !important; }

.nav-topbar { display: flex; height: var(--nav-height); width: 100%; align-items: center; justify-content: space-between; }
.nav-logo { display: flex; align-items: center; padding: 0 20px; height: var(--nav-height); color: var(--color-nav-primary); }
.nav-brand { font-family: var(--font-sans); font-weight: 700; font-size: var(--text-base); letter-spacing: var(--tracking-tight); color: var(--color-off-black); }

.nav-toggle { position: relative; width: var(--nav-height); height: var(--nav-height); flex-shrink: 0; }
.nav-toggle-bg { position: absolute; inset: 10px; border-radius: var(--radius-lg); transition: background var(--t-colors); }
.nav-toggle:hover .nav-toggle-bg { background: var(--color-nav-button-hover); }
.nav-line { position: absolute; left: 50%; height: 2px; width: 20px; border-radius: 9999px; background: var(--color-nav-primary); transition: all 300ms ease; }
.nl-top { top: 42%;    transform: translateX(-50%) translateY(-50%); }
.nl-bot { bottom: 42%; transform: translateX(-50%) translateY(50%); }
.nav-pill.open .nl-top { top: 50%;    transform: translateX(-50%) translateY(-50%) rotate( 45deg); }
.nav-pill.open .nl-bot { bottom: 50%; transform: translateX(-50%) translateY( 50%) rotate(-45deg); }

.nav-menu { padding: 8px 24px 24px; opacity: 0; transition: opacity 200ms 50ms; pointer-events: none; display: flex; flex-direction: column; gap: 32px; }
.nav-pill.open .nav-menu { opacity: 1; pointer-events: auto; }

.nav-links-list { display: flex; flex-direction: column; gap: 2px; }
.nav-links-list a {
  font-family: var(--font-sans);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  color: var(--color-nav-primary);
  line-height: 1.3;
  padding: 4px 10px;
  margin-left: -10px;
  border-radius: 8px;
  opacity: 1;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  position: relative;
  overflow: hidden;
  transition: opacity 320ms cubic-bezier(0.33, 1, 0.68, 1);
  will-change: opacity;
}
.nav-links-list a::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: 8px;
  background: linear-gradient(90deg, rgba(13,27,46,0.09) 0%, transparent 75%);
  transform: translateX(-100%);
  transition: transform 260ms cubic-bezier(0.33, 1, 0.68, 1);
  pointer-events: none;
}
.nav-links-list:hover a { opacity: 0.28; }
.nav-links-list:hover a:hover { opacity: 1; }
.nav-links-list:hover a:hover::before { transform: translateX(0); }
.nav-links-list a:active::before { transform: translateX(0); background: linear-gradient(90deg, rgba(13,27,46,0.15) 0%, transparent 75%); transition: transform 80ms ease; }
@media (hover: none) {
  .nav-links-list:hover a { opacity: 1; }
  .nav-links-list a:active, .nav-links-list a.tapped { opacity: 0.75 !important; }
  .nav-links-list a:active::before, .nav-links-list a.tapped::before { transform: translateX(0); transition: transform 80ms ease; }
}
@media (prefers-reduced-motion: reduce) {
  .nav-links-list a { transition: none; }
  .nav-links-list a::before { transition: none; }
  .nav-links-list:hover a { opacity: 1; }
}

.nav-contact { display: flex; flex-direction: row; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: nowrap; }
.lang-switcher { display: flex; align-items: center; gap: 2px; flex-shrink: 0; }
.lang-btn { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-wide); color: var(--color-off-black-60); background: none; border: none; cursor: pointer; padding: 2px 4px; position: relative; display: inline-flex; align-items: center; gap: 0; transition: color 200ms; overflow: hidden; }
.lang-btn::before { content: '\2197'; display: inline-block; font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0; width: 0; overflow: hidden; opacity: 0; transition: width 200ms cubic-bezier(0.33,1,0.68,1), opacity 200ms; }
.lang-btn:hover { color: var(--color-off-black); }
.lang-btn:hover::before { width: 14px; opacity: 1; }
.lang-btn.active { color: var(--color-off-black); font-weight: 600; }
.lang-sep { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-wide); color: var(--color-off-black-60); pointer-events: none; }
.nav-contact-copy { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-wide); color: var(--color-off-black-60); }
.nav-email { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-wide); color: var(--color-off-black-60); transition: color 200ms; }
.nav-email:hover { color: var(--color-off-black); }
.nav-menu-footer { display: flex; align-items: center; justify-content: flex-end; gap: 16px; margin-top: 16px; }
.nav-cta-pill { display: inline-flex; align-items: center; gap: 6px; border-radius: var(--radius-xl); background: #e87252; color: var(--color-white); font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 500; letter-spacing: var(--tracking-wide); padding: 10px 14px; transition: background var(--t-colors); }
.nav-cta-pill:hover { background: #d4593a; }

/* ── FOOTER ─────────────────────────────── */
.site-footer { background: var(--color-bg); padding: 0; }
.footer-inner { display: grid; grid-template-columns: 1fr; gap: 24px; padding: 48px 16px 40px; border-top: 1px solid var(--color-border); }
@media (min-width: 768px) { .footer-inner { padding: 48px 24px 60px; } }
.footer-links-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.footer-col-title { font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-secondary); margin-bottom: 12px; }
.footer-col a, .footer-col span { display: block; font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-wide); color: var(--color-primary); margin-bottom: 8px; transition: color 150ms; }
.footer-col a:hover { color: var(--color-secondary); }
.footer-bottom { display: flex; align-items: center; justify-content: center; padding: 16px 24px; border-top: 1px solid var(--color-border); }
.footer-copy { font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: var(--tracking-wide); color: var(--color-secondary); }

/* ── PRIVACY SHEET ──────────────────────── */
.privacy-overlay { position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,0.45); opacity: 0; visibility: hidden; transition: opacity 320ms cubic-bezier(0.4,0,0.2,1), visibility 320ms; }
.privacy-overlay.open { opacity: 1; visibility: visible; }
.privacy-sheet { position: fixed; bottom: 0; left: 0; right: 0; z-index: 201; background: #fff; border-radius: 20px 20px 0 0; height: 67vh; display: flex; flex-direction: column; transform: translateY(100%); transition: transform 380ms cubic-bezier(0.4, 0, 0.2, 1); box-shadow: 0 -4px 40px rgba(0,0,0,0.12); }
.privacy-sheet.open { transform: translateY(0); }
.privacy-sheet-handle { flex-shrink: 0; display: flex; align-items: center; justify-content: center; padding: 12px 0 8px; }
.privacy-sheet-handle::before { content: ''; width: 36px; height: 4px; border-radius: 2px; background: rgba(0,0,0,0.15); }
.privacy-sheet-header { flex-shrink: 0; display: flex; align-items: center; justify-content: space-between; padding: 0 24px 16px; border-bottom: 1px solid #f0ede8; }
.privacy-sheet-title { font-family: var(--font-sans); font-size: var(--text-base); font-weight: 700; letter-spacing: var(--tracking-tight); color: var(--color-off-black); }
.privacy-sheet-close { width: 32px; height: 32px; border-radius: 50%; background: #f3f3f0; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 16px; color: var(--color-off-black); transition: background 200ms; }
.privacy-sheet-close:hover { background: #e6e6e6; }
.privacy-sheet-body { flex: 1; overflow-y: auto; padding: 24px 24px 40px; -webkit-overflow-scrolling: touch; }
.privacy-sheet-body h2 { font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 600; color: var(--color-off-black); margin: 32px 0 8px; padding-top: 32px; border-top: 1px solid #f0ede8; }
.privacy-sheet-body h2:first-child { border-top: none; padding-top: 0; margin-top: 0; }
.privacy-sheet-body p, .privacy-sheet-body li { font-family: var(--font-sans); font-size: var(--text-sm); color: var(--color-off-black-60); line-height: 1.75; margin-bottom: 8px; }
.privacy-sheet-body ul { padding-left: 18px; margin-bottom: 8px; }
.privacy-sheet-body a { color: var(--color-off-black); }
.privacy-sheet-updated { font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: var(--tracking-wide); color: var(--color-off-black-50); margin-bottom: 24px; display: block; }

/* ── UTILITIES ──────────────────────────── */
.fade-up { opacity: 0; transform: translateY(18px); transition: opacity 0.9s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.9s cubic-bezier(0.22, 0.61, 0.36, 1); }
.fade-up.in { opacity: 1; transform: translateY(0); }
.fade-up.d1 { transition-delay: 0.12s; }
.fade-up.d2 { transition-delay: 0.28s; }
.fade-up.d3 { transition-delay: 0.44s; }
.fade-up.d4 { transition-delay: 0.60s; }
@media (prefers-reduced-motion: reduce) { .fade-up { opacity: 1; transform: none; transition: none; } }