/* ========================================
   CELEN CHAMBERS — BASE STYLES
   Design Tokens | Reset | Typography | 
   Utilities | Shared Components | Animations
   ======================================== */

/* ── CSS Custom Properties (Design Tokens) ── */
:root {
  /* Colors */
  --white: #FFFFFF;
  --off-white: #F7F9FC;
  --light-blue-grey: #E8EDF5;
  --border-light: #D0D8E8;
  --blue-accent: #1E5AA8;
  --deep-blue: #0F2B52;
  --text-primary: #0F1A2E;
  --text-secondary: #4A5570;
  --text-muted: #8A95AA;
  --navy-dark: #0A1525;
  --warm-sand: #E8DFD0;
  --success: #2E8B57;
  --error: #C0392B;

  /* Spacing */
  --section-padding: 12rem;
  --section-padding-lg: 16rem;
  --content-max: 120rem;
  --content-narrow: 72rem;
  --grid-gap: 3.2rem;
  --element-gap: 2.4rem;
  --element-gap-sm: 1.2rem;

  /* Border Radius */
  --radius-sm: 0.4rem;
  --radius-md: 0.8rem;
  --radius-lg: 1.2rem;

  /* Animation Easing */
  --ease-default: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-gentle: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Animation Durations */
  --dur-fast: 300ms;
  --dur-normal: 500ms;
  --dur-slow: 800ms;
  --dur-hero: 1200ms;

  /* Font Scale (1rem = 10px) */
  font-size: 62.5%;
}

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

html {
  scroll-behavior: smooth;
  font-size: 62.5%;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', sans-serif;
  font-size: 1.6rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.menu-open {
  overflow: hidden;
  touch-action: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

ul, ol {
  list-style: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 2rem;
  background: var(--blue-accent);
  color: var(--white);
  padding: 1rem 2rem;
  border-radius: var(--radius-sm);
  font-size: 1.3rem;
  font-weight: 500;
  z-index: 10000;
  transition: top var(--dur-fast);
}
.skip-link:focus {
  top: 2rem;
}

/* ── Typography ── */
.font-display {
  font-family: 'Cormorant Garamond', serif;
}

.font-body {
  font-family: 'Inter', sans-serif;
}

/* Display sizes with fluid scaling */
.display-xl {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(3.2rem, 6vw, 7.2rem);
  line-height: 0.95;
  font-weight: 300;
  letter-spacing: -0.02em;
}

.display-l {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2.8rem, 4.5vw, 5.6rem);
  line-height: 1.0;
  font-weight: 300;
  letter-spacing: -0.015em;
}

.heading-l {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2.8rem, 4vw, 4.2rem);
  line-height: 1.05;
  font-weight: 400;
  letter-spacing: -0.01em;
}

.heading-m {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2.4rem, 3vw, 3.2rem);
  line-height: 1.1;
  font-weight: 400;
}

.heading-s {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2rem, 2.5vw, 2.4rem);
  line-height: 1.15;
  font-weight: 500;
}

.label-xl {
  font-family: 'Inter', sans-serif;
  font-size: 1.4rem;
  line-height: 1.3;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.label-l {
  font-family: 'Inter', sans-serif;
  font-size: 1.2rem;
  line-height: 1.3;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.body-l {
  font-family: 'Inter', sans-serif;
  font-size: clamp(1.5rem, 1.6vw, 1.7rem);
  line-height: 1.65;
  font-weight: 400;
  letter-spacing: -0.01em;
}

.body-m {
  font-family: 'Inter', sans-serif;
  font-size: 1.5rem;
  line-height: 1.6;
  font-weight: 400;
}

.caption {
  font-family: 'Inter', sans-serif;
  font-size: 1.2rem;
  line-height: 1.4;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.nav-link {
  font-family: 'Inter', sans-serif;
  font-size: 1.3rem;
  line-height: 1.0;
  font-weight: 400;
  letter-spacing: 0.08em;
}

/* ── Layout Utilities ── */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 4rem;
}

.container-narrow {
  max-width: var(--content-narrow);
  margin: 0 auto;
  padding: 0 4rem;
}

.section-padding {
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
}

.section-padding-lg {
  padding-top: var(--section-padding-lg);
  padding-bottom: var(--section-padding-lg);
}

/* ── Section Header Pattern ── */
.section-header {
  text-align: center;
  margin-bottom: 6rem;
}

.section-header .label-xl {
  color: var(--blue-accent);
}

.section-header .heading-l {
  color: var(--text-primary);
  margin-top: 1.6rem;
}

.section-header .body-m {
  color: var(--text-secondary);
  margin-top: 1.2rem;
}

.section-header .decorative-line {
  width: 6rem;
  height: 1px;
  background: var(--border-light);
  margin: 2rem auto;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding: 1.4rem 3.2rem;
  border-radius: var(--radius-sm);
  font-family: 'Inter', sans-serif;
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-spring);
  white-space: nowrap;
}

.btn-primary {
  background: var(--blue-accent);
  color: var(--white);
  border: 1px solid var(--blue-accent);
}

.btn-primary:hover {
  background: var(--deep-blue);
  border-color: var(--deep-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(15, 43, 82, 0.2);
}

.btn-secondary {
  background: transparent;
  color: var(--blue-accent);
  border: 1px solid var(--blue-accent);
}

.btn-secondary:hover {
  background: var(--blue-accent);
  color: var(--white);
}

.btn-secondary-white {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--white);
}

.btn-secondary-white:hover {
  background: var(--white);
  color: var(--deep-blue);
}

.btn-tertiary {
  background: transparent;
  color: var(--blue-accent);
  border: none;
  padding: 0;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
}

.btn-tertiary .arrow {
  display: inline-block;
  transition: transform var(--dur-fast) var(--ease-default);
}

.btn-tertiary:hover .arrow {
  transform: translateX(8px);
}

.btn-full {
  width: 100%;
}

/* ── Link Underline Animation ── */
.link-underline {
  position: relative;
  display: inline-block;
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease-spring);
}

.link-underline:hover::after,
.link-underline.active::after {
  transform: scaleX(1);
}

/* ── Navigation ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 7.2rem;
  padding: 0 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 1000;
  transition: background var(--dur-fast) var(--ease-smooth),
              box-shadow var(--dur-fast) var(--ease-smooth),
              backdrop-filter var(--dur-fast);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: 'Cormorant Garamond', serif;
  font-size: 2rem;
  font-weight: 500;
  color: var(--text-primary);
  z-index: 1001;
}

.navbar__logo-icon {
  width: 2.4rem;
  height: 2.4rem;
  color: var(--blue-accent);
}

.navbar__nav {
  display: flex;
  align-items: center;
  gap: 3.2rem;
}

.navbar__nav a {
  font-family: 'Inter', sans-serif;
  font-size: 1.3rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  position: relative;
}

.navbar__nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--blue-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease-spring);
}

.navbar__nav a:hover::after,
.navbar__nav a.active::after {
  transform: scaleX(1);
}

/* ── Language Dropdown ── */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown__toggle {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: 'Inter', sans-serif;
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast);
}

.dropdown__toggle:hover {
  background: rgba(0, 0, 0, 0.04);
}

.navbar.scrolled .dropdown__toggle:hover {
  background: rgba(0, 0, 0, 0.04);
}

.dropdown__menu {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 14rem;
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--dur-fast) var(--ease-spring);
  padding: 0.8rem 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.dropdown:hover .dropdown__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown__menu button, .dropdown__menu--static button {
  text-align: left;
  width: 100%;
  padding: 0.8rem 1.6rem;
  font-family: 'Inter', sans-serif;
  font-size: 1.3rem;
  color: var(--text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  transition: background var(--dur-fast), color var(--dur-fast);
}

.dropdown__menu button:hover, .dropdown__menu--static button:hover {
  background: var(--light-blue-grey);
  color: var(--blue-accent);
}

.dropdown__menu button.active, .dropdown__menu--static button.active {
  color: var(--blue-accent);
  font-weight: 500;
  background: rgba(30, 90, 168, 0.04);
}

/* Hamburger */
.navbar__toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 3.2rem;
  height: 2.4rem;
  cursor: pointer;
  z-index: 1001;
  background: none;
  border: none;
  padding: 0;
  position: relative;
}

.navbar__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--dur-normal) var(--ease-spring),
              opacity var(--dur-fast) var(--ease-smooth),
              background-color var(--dur-fast) var(--ease-smooth);
}

.navbar__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(11px) rotate(45deg);
}

.navbar__toggle[aria-expanded="true"] span:nth-child(2) {
  transform: translateY(-11px) rotate(-45deg);
}

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-normal) var(--ease-smooth);
  padding: 4rem 2rem;
  overflow-y: auto;
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu a {
  font-family: 'Cormorant Garamond', serif;
  font-size: 3.2rem;
  font-weight: 400;
  color: var(--text-primary);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur-normal) var(--ease-gentle),
              transform var(--dur-normal) var(--ease-gentle),
              color var(--dur-fast) var(--ease-smooth);
}

.mobile-menu a:hover,
.mobile-menu a:active {
  color: var(--blue-accent);
}

.mobile-menu.open a {
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu.open a:nth-child(1) { transition-delay: 50ms; }
.mobile-menu.open a:nth-child(2) { transition-delay: 100ms; }
.mobile-menu.open a:nth-child(3) { transition-delay: 150ms; }
.mobile-menu.open a:nth-child(4) { transition-delay: 200ms; }
.mobile-menu.open a:nth-child(5) { transition-delay: 250ms; }

.mobile-menu__lang {
  display: flex;
  justify-content: center;
  width: 100%;
  margin-top: 1rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur-normal) var(--ease-gentle) 300ms,
              transform var(--dur-normal) var(--ease-gentle) 300ms;
}

.mobile-menu.open .mobile-menu__lang {
  opacity: 1;
  transform: translateY(0);
}

.dropdown__menu--static {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem;
  background: var(--off-white);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  width: 100%;
  max-width: 32rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
  border: 1px solid var(--border-light);
}

.mobile-lang-header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding-bottom: 1.2rem;
  font-family: 'Inter', sans-serif;
  font-size: 1.2rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 0.8rem;
  background: transparent;
}

.mobile-lang-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding: 1.2rem;
  font-family: 'Inter', sans-serif;
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.02);
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 0.4rem;
}

.mobile-lang-header svg {
  color: var(--blue-accent);
}

.dropdown__menu--static button {
  text-align: center;
  padding: 1rem;
  font-size: 1.4rem;
  border-radius: var(--radius-sm);
}

.dropdown__menu--static button.active {
  background: var(--blue-accent);
  color: var(--white);
}

.lang-icon {
  color: var(--text-muted);
  transition: color var(--dur-fast);
}

.dropdown:hover .lang-icon {
  color: var(--blue-accent);
}


/* ── Footer ── */
.footer {
  background: var(--navy-dark);
  padding-top: 10rem;
  padding-bottom: 6rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: 4rem;
}

.footer__brand {
  font-family: 'Cormorant Garamond', serif;
  font-size: 2.4rem;
  font-weight: 400;
  color: var(--white);
}

.footer__tagline {
  font-size: 1.5rem;
  color: var(--text-muted);
  margin-top: 1.2rem;
}

.footer__socials {
  display: flex;
  gap: 1.6rem;
  margin-top: 2rem;
}

.footer__socials a {
  color: var(--text-muted);
  transition: color var(--dur-fast);
}

.footer__socials a:hover {
  color: var(--white);
}

.footer__heading {
  font-family: 'Inter', sans-serif;
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 2rem;
}

.footer__links li {
  margin-bottom: 1.2rem;
}

.footer__links a {
  font-size: 1.5rem;
  color: var(--text-muted);
  transition: color var(--dur-fast), transform var(--dur-fast);
  display: inline-block;
}

.footer__links a:hover {
  color: var(--white);
  transform: translateX(4px);
}

.footer__contact p {
  font-size: 1.5rem;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

.footer__contact a {
  color: var(--text-muted);
  transition: color var(--dur-fast);
}

.footer__contact a:hover {
  color: var(--white);
}

.footer__contact .btn-secondary-white {
  margin-top: 2rem;
  padding: 1rem 2.4rem;
  font-size: 1.2rem;
}

.footer__bottom {
  margin-top: 6rem;
  padding-top: 2.4rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer__bottom p,
.footer__bottom a {
  font-size: 1.2rem;
  color: var(--text-muted);
}

.footer__bottom a:hover {
  color: var(--white);
}

/* ── Page Header (shared across inner pages) ── */
.page-header {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 12rem 4rem 4rem;
}

.page-header__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.page-header__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(15, 43, 82, 0.85);
}

.page-header__content {
  position: relative;
  z-index: 1;
  max-width: 80rem;
}

.page-header .label-xl {
  color: rgba(255, 255, 255, 0.5);
}

.page-header .display-l {
  color: var(--white);
  margin-top: 1.6rem;
}

.page-header .body-l {
  color: rgba(255, 255, 255, 0.7);
  margin-top: 2rem;
}

.page-header__breadcrumb {
  margin-top: 3rem;
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.4);
}

.page-header__breadcrumb a {
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--dur-fast);
}

.page-header__breadcrumb a:hover {
  color: var(--white);
}

/* ── Animations ── */

/* Hero entrance keyframes */
@keyframes heroBgScale {
  from { transform: scale(1.05); }
  to { transform: scale(1); }
}

@keyframes heroFadeUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes heroFadeUpSmall {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollIndicator {
  0% { transform: translateY(0); }
  100% { transform: translateY(3.6rem); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Scroll Animation System ── */
[data-animate] {
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-smooth),
              transform var(--dur-slow) var(--ease-smooth);
}

[data-animate="fade-up"] {
  transform: translateY(40px);
}

[data-animate="fade-left"] {
  transform: translateX(-40px);
}

[data-animate="fade-right"] {
  transform: translateX(40px);
}

[data-animate="scale-in"] {
  transform: scale(1.03);
}

[data-animate="heading"] {
  transform: translateY(30px);
  transition-timing-function: var(--ease-gentle);
}

[data-animate].is-visible {
  opacity: 1;
  transform: translate(0) scale(1);
}

/* Stagger delays */
[data-delay="1"] { transition-delay: 100ms; }
[data-delay="2"] { transition-delay: 200ms; }
[data-delay="3"] { transition-delay: 300ms; }
[data-delay="4"] { transition-delay: 400ms; }
[data-delay="5"] { transition-delay: 500ms; }
[data-delay="6"] { transition-delay: 600ms; }
[data-delay="7"] { transition-delay: 700ms; }
[data-delay="8"] { transition-delay: 800ms; }

/* ── Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
  
  [data-animate] {
    opacity: 1;
    transform: none;
  }
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 6rem;
    --section-padding-lg: 8rem;
  }
  
  .container,
  .container-narrow {
    padding: 0 2rem;
  }
  
  .navbar {
    padding: 0 2rem;
  }
  
  .navbar__nav,
  .navbar__lang {
    display: none;
  }
  
  .navbar__toggle {
    display: flex;
  }
  
  .footer__grid {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
  
  .footer__bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .page-header {
    min-height: 40vh;
    padding-top: 10rem;
  }
}