/* ============================================================
   MANSEOK-HWASU — Design Tokens
   Color palette pulled directly from your brand color system.
   Soft neomorphism: light comes from top-left, shadow falls
   bottom-right. Surfaces are slightly raised or pressed-in.
   ============================================================ */

:root {
  /* ── Brand: Primary & Secondary ───────────── */
  --primary-sky: #97D5FF;
  --secondary-aqua: #84E3E9;
  --secondary-yellow: #FFC229;
  --secondary-orange: #FF7746;

  /* ── System ────────────────────────────────── */
  --system-white: #FFFAF3;
  --system-black: #292121;

  /* ── Grayscale ─────────────────────────────── */
  --gray-1: #FCFCFC;
  --gray-2: #F1F1F1;
  --gray-3: #E5E5E5;
  --gray-4: #CCCCCC;
  --gray-5: #B6B6B6;
  --gray-6: #A0A0A0;
  --gray-7: #808080;
  --gray-8: #4A4A4A;
  --gray-9: #292121;

  /* ── Semantic ──────────────────────────────── */
  --bg: #EEF2F7;             /* the canvas — slightly cool, neutral */
  --bg-elevated: #F4F7FA;
  --surface: #EEF2F7;
  --ink: #292121;
  --ink-muted: #6b7280;
  --ink-soft: #9aa3af;
  --accent: var(--secondary-orange);
  --accent-soft: var(--primary-sky);

  /* ── Neomorphism shadows ───────────────────── */
  /* Raised */
  --neo-raised:
    -8px -8px 20px rgba(255, 255, 255, 0.95),
    8px 8px 20px rgba(163, 177, 198, 0.45);
  --neo-raised-sm:
    -4px -4px 10px rgba(255, 255, 255, 0.9),
    4px 4px 10px rgba(163, 177, 198, 0.35);
  --neo-raised-lg:
    -14px -14px 32px rgba(255, 255, 255, 0.95),
    14px 14px 32px rgba(163, 177, 198, 0.5);
  /* Pressed (inset) */
  --neo-pressed:
    inset -4px -4px 10px rgba(255, 255, 255, 0.85),
    inset 4px 4px 10px rgba(163, 177, 198, 0.35);
  --neo-pressed-deep:
    inset -6px -6px 14px rgba(255, 255, 255, 0.85),
    inset 6px 6px 14px rgba(163, 177, 198, 0.45);
  /* Hover lift */
  --neo-lift:
    -10px -10px 24px rgba(255, 255, 255, 1),
    10px 10px 24px rgba(163, 177, 198, 0.55);

  /* ── Type ──────────────────────────────────── */
  --font-display: "Fraunces", "Noto Serif KR", Georgia, serif;
  --font-body: "Inter", "Noto Sans KR", system-ui, sans-serif;

  /* ── Layout ────────────────────────────────── */
  --radius-sm: 12px;
  --radius: 20px;
  --radius-lg: 28px;
  --radius-xl: 40px;
  --radius-pill: 999px;

  --container: 1280px;
  --gutter: 24px;

  --transition: 220ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 480ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   Reset & Base
   ============================================================ */

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: hidden; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 1200px 600px at 80% -10%, rgba(151, 213, 255, 0.26), transparent 60%),
    radial-gradient(ellipse 900px 500px at -10% 80%, rgba(255, 119, 70, 0.14), transparent 60%),
    radial-gradient(ellipse 600px 400px at 50% 50%, rgba(132, 227, 233, 0.06), transparent 70%);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  max-width: 100vw;
}

img, svg { display: block; max-width: 100%; height: auto; }
button { font-family: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.15;
  color: var(--ink);
}
h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.8rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

.eyebrow {
  font-family: var(--font-body);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 500;
}

.section-head .eyebrow {
  color: var(--secondary-orange);
  letter-spacing: 0.24em;
}

/* ============================================================
   Layout helpers
   ============================================================ */

.container {
  width: min(100% - calc(var(--gutter) * 2), var(--container));
  margin-inline: auto;
}

section {
  padding: clamp(64px, 9vw, 120px) 0;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 56px;
  max-width: 720px;
}

/* ============================================================
   Top Navigation
   ============================================================ */

.nav {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: min(100% - 32px, 1320px);
  z-index: 100;
  padding: 12px 18px;
  background: rgba(238, 242, 247, 0.78);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-radius: var(--radius-pill);
  box-shadow: var(--neo-raised-sm);
  display: flex;
  align-items: center;
  gap: 18px;
  transition: box-shadow var(--transition), background var(--transition);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 8px;
  flex-shrink: 0;
}

.nav__logo {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--primary-sky);
  padding: 6px;
  box-shadow: 0 0 0 2px rgba(151, 213, 255, 0.3), 0 2px 8px rgba(151, 213, 255, 0.4);
}
.nav__logo svg { width: 100%; height: 100%; fill: var(--system-white); }
.nav__logo img { width: 100%; height: 100%; object-fit: contain; }

.nav__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.nav__brand-text strong {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  font-weight: 500;
}
.nav__brand-text span {
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: var(--ink-muted);
  margin-top: 3px;
}

.nav__menu {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.nav__link {
  position: relative;
  padding: 10px 18px;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  font-weight: 500;
  color: var(--ink-muted);
  border-radius: var(--radius-pill);
  transition: color var(--transition), background var(--transition), box-shadow var(--transition);
}

.nav__link:hover { color: var(--ink); }

.nav__link.is-active {
  color: var(--ink);
  background: var(--bg);
  box-shadow: var(--neo-pressed);
}

.nav__link.is-active::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 4px;
  transform: translateX(-50%);
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.nav__lang {
  flex-shrink: 0;
  padding: 9px 16px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  font-weight: 600;
  border-radius: var(--radius-pill);
  background: var(--ink);
  color: var(--system-white);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: transform var(--transition), background var(--transition);
}
.nav__lang:hover { transform: translateY(-1px); background: var(--gray-8); }
.nav__lang svg { width: 12px; height: 12px; }

/* mobile nav toggle */
.nav__toggle { display: none; }

@media (max-width: 980px) {
  .nav { padding: 10px 14px; gap: 8px; }
  .nav__brand-text span { display: none; }
  .nav__menu {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg);
    border-radius: var(--radius);
    padding: 12px;
    box-shadow: var(--neo-raised);
    gap: 6px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity var(--transition), transform var(--transition);
  }
  .nav.is-open .nav__menu {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  .nav__link {
    width: 100%;
    text-align: center;
    padding: 14px 16px;
    min-height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    box-shadow: var(--neo-raised-sm);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    letter-spacing: 0.12em;
  }
  .nav__link.is-active {
    box-shadow: var(--neo-pressed);
    background: var(--bg);
  }
  .nav__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-left: auto;
    border-radius: 50%;
    background: var(--bg);
    box-shadow: var(--neo-raised-sm);
    flex-shrink: 0;
  }
  .nav__toggle svg { width: 18px; height: 18px; }
  .nav__lang { padding: 10px 14px; font-size: 0.7rem; }
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  font-family: var(--font-body);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  font-weight: 500;
  text-transform: uppercase;
  border-radius: var(--radius-pill);
  background: var(--bg);
  color: var(--ink);
  box-shadow: var(--neo-raised);
  transition: box-shadow var(--transition), transform var(--transition), color var(--transition);
}
.btn:hover { box-shadow: var(--neo-lift); transform: translateY(-1px); }
.btn:active { box-shadow: var(--neo-pressed); transform: translateY(0); }
.btn svg { width: 14px; height: 14px; transition: transform var(--transition); }
.btn:hover svg { transform: translateX(3px); }

.btn--primary { background: var(--ink); color: var(--system-white); box-shadow: var(--neo-raised); }
.btn--primary:hover { background: var(--gray-8); }
.btn--accent { background: var(--accent); color: white; }
.btn--accent:hover { background: #e5642f; }

/* ============================================================
   Card primitive (raised neomorphic surface)
   ============================================================ */

.card {
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--neo-raised);
  transition: box-shadow var(--transition), transform var(--transition);
}
.card--lifted:hover { box-shadow: var(--neo-lift); transform: translateY(-3px); }
.card--inset { box-shadow: var(--neo-pressed); }

/* ============================================================
   Footer
   ============================================================ */

.footer {
  padding: 80px 0 40px;
  border-top: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--primary-sky), var(--secondary-aqua), var(--secondary-yellow)) 1;
  margin-top: 80px;
  background-image: radial-gradient(ellipse 800px 300px at 50% 0%, rgba(151, 213, 255, 0.06), transparent 70%);
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}
.footer__brand-block { max-width: 320px; }
.footer__brand-block .nav__brand-text strong { font-size: 0.95rem; }
.footer__brand-block p {
  font-size: 0.88rem;
  color: var(--ink-muted);
  margin-top: 16px;
  line-height: 1.7;
}
.footer h4 {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 16px;
}
.footer ul li { margin-bottom: 8px; font-size: 0.88rem; color: var(--ink-muted); }
.footer__bottom {
  text-align: center;
  font-size: 0.78rem;
  color: var(--ink-soft);
  padding-top: 32px;
  border-top: 1px solid rgba(0,0,0,0.04);
}

@media (max-width: 720px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand-block { grid-column: 1 / -1; }
}

/* ============================================================
   Animations
   ============================================================ */

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
@keyframes pulse-soft {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.05); opacity: 0.85; }
}
@keyframes ripple {
  0% { transform: scale(0.8); opacity: 0.6; }
  100% { transform: scale(2.4); opacity: 0; }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 800ms ease, transform 800ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   Utility
   ============================================================ */

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   Mobile touch enhancements
   ============================================================ */

@media (max-width: 640px) {
  .btn {
    padding: 16px 24px;
    font-size: 0.86rem;
    min-height: 52px;
  }
  h1 { font-size: clamp(2rem, 7vw, 3rem); }
  h2 { font-size: clamp(1.6rem, 5vw, 2.2rem); }
}

@media (pointer: coarse) {
  .btn:active { box-shadow: var(--neo-pressed); transform: scale(0.97); }
  .card:active { box-shadow: var(--neo-pressed); transform: scale(0.99); }
  .nav__link:active { box-shadow: var(--neo-pressed) !important; background: var(--bg) !important; }
  .nav__toggle:active { box-shadow: var(--neo-pressed); }
}