/* ============================================================
   Seven Summits — Global Stylesheet
   Design System: Premium Outdoor × Wilderness Luxury
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  --color-navy:        #0d1b2a;
  --color-navy-mid:    #162032;
  --color-navy-light:  #1e3048;
  --color-gold:        #c9a84c;
  --color-gold-light:  #e0c47a;
  --color-gold-dim:    #8a6f33;
  --color-stone:       #8c9baa;
  --color-stone-light: #b8c4ce;
  --color-offwhite:    #f4f1eb;
  --color-white:       #ffffff;
  --color-black:       #050d15;

  --font-serif:  'Cormorant Garamond', 'Noto Serif JP', Georgia, serif;
  --font-sans:   'Inter', 'Noto Sans JP', sans-serif;
  --font-mono:   'JetBrains Mono', monospace;

  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  --shadow-card:  0 4px 32px rgba(5, 13, 21, 0.45);
  --shadow-glow:  0 0 40px rgba(201, 168, 76, 0.15);

  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  16px;

  --max-width: 1280px;
  --section-py: clamp(5rem, 10vw, 9rem);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--color-navy);
  color: var(--color-offwhite);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, video { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

ul, ol { list-style: none; }

/* ---------- Typography ---------- */
.font-serif { font-family: var(--font-serif); }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.01em;
}

.text-gold   { color: var(--color-gold); }
.text-stone  { color: var(--color-stone); }
.text-white  { color: var(--color-white); }
.text-offwhite { color: var(--color-offwhite); }

/* ---------- Layout Utilities ---------- */
.container {
  width: min(var(--max-width), 100% - 3rem);
  margin-inline: auto;
}

.section-py { padding-block: var(--section-py); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }

/* ---------- Global Navigation ---------- */
.global-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1.25rem 0;
  transition: background var(--transition-base), padding var(--transition-base);
}

.global-nav.scrolled {
  background: rgba(13, 27, 42, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 0.875rem 0;
  border-bottom: 1px solid rgba(201, 168, 76, 0.15);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.nav-logo .logo-main {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-white);
}
.nav-logo .logo-sub {
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-links a {
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-stone-light);
  transition: color var(--transition-base);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 1px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}
.nav-links a:hover { color: var(--color-white); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--color-gold); }
.nav-links a.active::after { transform: scaleX(1); }

.nav-cta {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold) !important;
  border: 1px solid rgba(201, 168, 76, 0.4);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition-base), border-color var(--transition-base), color var(--transition-base) !important;
}
.nav-cta:hover {
  background: var(--color-gold) !important;
  color: var(--color-navy) !important;
  border-color: var(--color-gold) !important;
}
.nav-cta::after { display: none !important; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-offwhite);
  transition: var(--transition-base);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  transition: var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-gold);
  color: var(--color-navy);
  padding: 1rem 2.25rem;
  border-radius: var(--radius-sm);
}
.btn-primary:hover {
  background: var(--color-gold-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201, 168, 76, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-offwhite);
  padding: 0.9rem 2.25rem;
  border: 1px solid rgba(244, 241, 235, 0.3);
  border-radius: var(--radius-sm);
}
.btn-outline:hover {
  background: rgba(244, 241, 235, 0.08);
  border-color: var(--color-offwhite);
  transform: translateY(-2px);
}

.btn-gold-outline {
  background: transparent;
  color: var(--color-gold);
  padding: 0.9rem 2.25rem;
  border: 1px solid rgba(201, 168, 76, 0.5);
  border-radius: var(--radius-sm);
}
.btn-gold-outline:hover {
  background: rgba(201, 168, 76, 0.1);
  border-color: var(--color-gold);
  transform: translateY(-2px);
}

/* ---------- Section Labels ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 1.25rem;
}
.section-label::before {
  content: '';
  display: block;
  width: 2rem;
  height: 1px;
  background: var(--color-gold);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--color-white);
  margin-bottom: 1.25rem;
}

.section-desc {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-stone-light);
  max-width: 56ch;
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-navy-light);
  border: 1px solid rgba(201, 168, 76, 0.12);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  border-color: rgba(201, 168, 76, 0.3);
}

.card-body { padding: 2rem; }

/* ---------- Dividers ---------- */
.divider-gold {
  width: 3rem;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold), transparent);
  margin-block: 1.5rem;
}

.divider-section {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(201, 168, 76, 0.2), transparent);
  margin-block: 0;
}

/* ---------- Scroll Fade Animation ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ---------- Footer ---------- */
.global-footer {
  background: var(--color-black);
  border-top: 1px solid rgba(201, 168, 76, 0.12);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand .logo-main {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-white);
  display: block;
  margin-bottom: 0.35rem;
}
.footer-brand .logo-sub {
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-gold);
  display: block;
  margin-bottom: 1.25rem;
}
.footer-brand p {
  font-size: 0.875rem;
  color: var(--color-stone);
  line-height: 1.8;
  max-width: 30ch;
}

.footer-col h4 {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 1.25rem;
  font-family: var(--font-sans);
  font-weight: 500;
}
.footer-col ul li { margin-bottom: 0.65rem; }
.footer-col ul a {
  font-size: 0.875rem;
  color: var(--color-stone);
  transition: color var(--transition-base);
}
.footer-col ul a:hover { color: var(--color-offwhite); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-bottom p {
  font-size: 0.78rem;
  color: var(--color-stone);
  letter-spacing: 0.04em;
}
.footer-bottom a {
  font-size: 0.78rem;
  color: var(--color-stone);
  transition: color var(--transition-base);
}
.footer-bottom a:hover { color: var(--color-gold); }

/* ---------- Overlay / Modals ---------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--color-navy);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu a {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  color: var(--color-offwhite);
  letter-spacing: 0.06em;
  transition: color var(--transition-base);
}
.mobile-menu a:hover { color: var(--color-gold); }
.mobile-menu-close {
  position: absolute;
  top: 1.5rem; right: 1.5rem;
  background: none;
  border: none;
  color: var(--color-stone-light);
  font-size: 1.75rem;
  cursor: pointer;
  transition: color var(--transition-base);
}
.mobile-menu-close:hover { color: var(--color-gold); }

/* ---------- Noise Texture Overlay ---------- */
.noise-overlay {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  opacity: 0.5;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --section-py: 4rem; }

  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .section-title { font-size: clamp(1.75rem, 6vw, 2.5rem); }
}