/* =========================================================
   GAS O2 KAPITAL — Corporate site
   Design tokens
   ========================================================= */
:root{
  --ink:        #0E2A43;   /* primary navy */
  --ink-deep:   #0A2036;   /* darkest navy, hero/footer bg */
  --steel:      #3D6785;   /* secondary blue */
  --steel-light:#B8C4CD;   /* muted light steel, on-dark text */
  --teal:       #2BA8A0;   /* signal accent */
  --amber:      #C97A3D;   /* heat / signature accent, used sparingly */
  --paper:      #F5F7F9;   /* off-white background */
  --card:       #EAF0F3;   /* card tint */
  --line:       #DCE3E8;   /* hairline borders on light bg */
  --ink-text:   #1B2A36;   /* body text on light */
  --muted:      #5B6B77;   /* secondary text on light */

  --display: "Newsreader", "Noto Serif", Georgia, serif;
  --body:    "Inter", "Noto Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --maxw: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 10px;
}

/* Per-language font overrides — set on <body class="lang-xx"> */
body.lang-zh{ --display: "Noto Serif SC", "Newsreader", serif; --body: "Noto Sans SC", "Inter", sans-serif; }
body.lang-ar{ --display: "Noto Naskh Arabic", "Newsreader", serif; --body: "Noto Sans Arabic", "Inter", sans-serif; }
body.lang-ru{ --display: "Newsreader", serif; --body: "Inter", sans-serif; }
body.lang-es{ --display: "Newsreader", serif; --body: "Inter", sans-serif; }

/* =========================================================
   Reset & base
   ========================================================= */
*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

body{
  margin: 0;
  font-family: var(--body);
  color: var(--ink-text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-align: start;
}

img{ max-width: 100%; display: block; }
a{ color: inherit; }

h1, h2, h3{
  font-family: var(--display);
  color: var(--ink);
  margin: 0;
  line-height: 1.12;
  font-weight: 600;
}

p{ margin: 0; }

.container{
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

section{ padding-block: clamp(3.5rem, 8vw, 6.5rem); }

/* visually-hidden utility */
.vh{ position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }

/* focus visibility */
a:focus-visible, button:focus-visible, select:focus-visible{
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

/* =========================================================
   Eyebrow / manifest-style labels
   ========================================================= */
.eyebrow{
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
  display: flex;
  align-items: center;
  gap: 0.6em;
  margin-block-end: 1rem;
}
.eyebrow::before{
  content: "";
  width: 28px;
  height: 1px;
  background: var(--teal);
  flex: none;
}
[dir="rtl"] .eyebrow::before{ order: 2; }

/* =========================================================
   Top navigation
   ========================================================= */
.topbar{
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  background: rgba(10, 32, 54, 0.82);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid rgba(184, 196, 205, 0.15);
}
.topbar__inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.85rem;
}
.brand{
  display: flex;
  flex-direction: column;
  line-height: 1;
  text-decoration: none;
  flex: none;
}
.brand__main{
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  color: #fff;
}
.brand__sub{
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.28em;
  color: var(--steel-light);
  margin-top: 3px;
}

.nav-links{
  display: flex;
  gap: clamp(1rem, 2vw, 2rem);
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a{
  text-decoration: none;
  font-size: 0.86rem;
  color: var(--steel-light);
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
  white-space: nowrap;
}
.nav-links a:hover{ color: #fff; }

.nav-right{ display: flex; align-items: center; gap: 1rem; }

.langswitch{
  position: relative;
}
.langswitch__btn{
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  background: transparent;
  color: var(--steel-light);
  border: 1px solid rgba(184,196,205,0.35);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.langswitch__btn:hover{ border-color: var(--teal); color: #fff; }
.langswitch__menu{
  position: absolute;
  inset-inline-end: 0;
  top: calc(100% + 0.6rem);
  background: var(--ink-deep);
  border: 1px solid rgba(184,196,205,0.2);
  border-radius: 8px;
  padding: 0.4rem;
  display: none;
  flex-direction: column;
  min-width: 150px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.35);
}
.langswitch.open .langswitch__menu{ display: flex; }
.langswitch__menu button{
  background: transparent;
  border: 0;
  color: var(--steel-light);
  font-family: var(--body);
  font-size: 0.85rem;
  text-align: start;
  padding: 0.5rem 0.7rem;
  border-radius: 6px;
  cursor: pointer;
}
.langswitch__menu button:hover{ background: rgba(43,168,160,0.15); color: #fff; }
.langswitch__menu button[aria-current="true"]{ color: var(--teal); }

.navtoggle{
  display: none;
  background: transparent;
  border: 1px solid rgba(184,196,205,0.35);
  border-radius: 6px;
  width: 40px; height: 36px;
  color: #fff;
  cursor: pointer;
  flex: none;
}

/* =========================================================
   Hero
   ========================================================= */
.hero{
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  color: #fff;
  background: var(--ink-deep);
  overflow: hidden;
  padding-block-start: 6rem;
}
.hero__bg{
  position: absolute;
  inset: 0;
  background-image: linear-gradient(180deg, rgba(10,32,54,0.55) 0%, rgba(10,32,54,0.72) 55%, rgba(10,32,54,0.96) 100%), url("../img/refinery.jpg");
  background-size: cover;
  background-position: center 65%;
  filter: saturate(0.75) contrast(1.05);
}
.hero__grain{
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 15%, rgba(43,168,160,0.16), transparent 45%);
  mix-blend-mode: screen;
}
.hero__content{
  position: relative;
  z-index: 2;
  padding-block-end: clamp(3rem, 8vw, 5.5rem);
  width: 100%;
}
.hero__title{
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  color: #fff;
  max-width: 16ch;
  letter-spacing: -0.01em;
}
.hero__title em{
  font-style: italic;
  color: var(--teal);
}
.hero__subtitle{
  margin-block-start: 1.4rem;
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  color: var(--steel-light);
  max-width: 46ch;
  line-height: 1.55;
}
.hero__ctas{
  display: flex;
  gap: 1rem;
  margin-block-start: 2.2rem;
  flex-wrap: wrap;
}
.btn{
  font-family: var(--body);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, color .2s ease;
}
.btn:hover{ transform: translateY(-2px); }
.btn--solid{ background: var(--teal); color: #072421; }
.btn--solid:hover{ background: #34bdb3; }
.btn--outline{ border-color: rgba(255,255,255,0.4); color: #fff; }
.btn--outline:hover{ border-color: #fff; }

/* Manifest strip — signature element */
.manifest{
  position: relative;
  z-index: 2;
  margin-block-start: 3rem;
  border-top: 1px solid rgba(184,196,205,0.25);
  padding-block-start: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  font-family: var(--mono);
}
.manifest__item{
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.manifest__value{
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  color: #fff;
  font-weight: 600;
}
.manifest__label{
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel-light);
}

/* =========================================================
   Section headers
   ========================================================= */
.section-head{
  max-width: 62ch;
  margin-block-end: clamp(2rem, 5vw, 3.2rem);
}
.section-head h2{
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
}
.section-head p{
  margin-block-start: 1rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.6;
}

.section--tint{ background: #fff; }

/* =========================================================
   Who we are
   ========================================================= */
.who__grid{
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.who__lead{
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
}
.who__body{
  margin-block-start: 1.3rem;
  color: var(--ink-text);
  line-height: 1.7;
  font-size: 1rem;
}
.who__stats{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.9rem;
  margin-block-start: 2rem;
}
.stat-card{
  background: var(--card);
  border-radius: var(--radius);
  padding: 1.2rem 0.9rem;
  text-align: center;
}
.stat-card__value{
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--ink);
}
.stat-card__label{
  margin-block-start: 0.35rem;
  font-size: 0.78rem;
  color: var(--muted);
}
.who__image{
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4/5;
}
.who__image img{ width: 100%; height: 100%; object-fit: cover; }

/* =========================================================
   Pillars
   ========================================================= */
.pillars__grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}
.pillar-card{
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.pillar-card__media{
  aspect-ratio: 4/3;
  overflow: hidden;
}
.pillar-card__media img{ width:100%; height:100%; object-fit: cover; transition: transform 0.5s ease; }
.pillar-card:hover .pillar-card__media img{ transform: scale(1.06); }
.pillar-card__media--solid{
  background: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
}
.pillar-card__media--solid span{
  font-family: var(--mono);
  color: var(--teal);
  letter-spacing: 0.2em;
  font-size: 0.85rem;
}
.pillar-card__body{ padding: 1.2rem 1.3rem 1.5rem; flex: 1; }
.pillar-card__num{
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--teal);
  letter-spacing: 0.1em;
}
.pillar-card__title{
  font-family: var(--display);
  font-size: 1.15rem;
  color: var(--ink);
  margin-block-start: 0.5rem;
  font-weight: 700;
}
.pillar-card__desc{
  margin-block-start: 0.6rem;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.55;
}

/* =========================================================
   Process (timeline)
   ========================================================= */
.process__track{
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  position: relative;
}
.process__track::before{
  content: "";
  position: absolute;
  top: 22px;
  inset-inline: 4%;
  height: 1px;
  background: var(--line);
  z-index: 0;
}
.process-step{ position: relative; z-index: 1; }
.process-step__num{
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--teal);
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.05rem;
  display: flex; align-items: center; justify-content: center;
  margin-inline: auto;
}
.process-step__title{
  margin-block-start: 1.1rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
  text-align: center;
  line-height: 1.35;
}
.process-step__desc{
  margin-block-start: 0.6rem;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.55;
}

/* =========================================================
   Why us
   ========================================================= */
.why__grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.why-card{
  background: var(--card);
  border-radius: var(--radius);
  padding: 1.8rem 1.6rem;
}
.why-card__num{
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--teal);
  color: #072421;
  font-family: var(--display);
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.why-card__title{
  margin-block-start: 1.2rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
}
.why-card__desc{
  margin-block-start: 0.8rem;
  font-size: 0.92rem;
  color: var(--ink-text);
  line-height: 1.6;
}

/* =========================================================
   Global footprint
   ========================================================= */
.global{ background: var(--ink-deep); color: #fff; }
.global .eyebrow{ color: var(--teal); }
.global__grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.global h2{ color: #fff; }
.global__body{
  margin-block-start: 1.2rem;
  color: var(--steel-light);
  line-height: 1.7;
  font-size: 1.02rem;
}
.global__regions{
  list-style: none;
  margin: 1.8rem 0 0; padding: 0;
  display: flex;
  gap: 1.6rem;
  flex-wrap: wrap;
}
.global__regions li{
  display: flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 600;
}
.global__regions li::before{
  content: "";
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--teal);
  flex: none;
}
.global__images{
  display: grid;
  gap: 1rem;
}
.global__images img{
  border-radius: var(--radius);
  aspect-ratio: 16/9;
  object-fit: cover;
  width: 100%;
}

/* =========================================================
   Closing
   ========================================================= */
.closing{
  text-align: center;
  padding-block: clamp(4rem, 10vw, 7rem);
}
.closing h2{
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  max-width: 22ch;
  margin-inline: auto;
}
.closing p{
  max-width: 58ch;
  margin: 1.3rem auto 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.65;
}
.closing__brand{
  margin-block-start: 2.6rem;
}
.closing__brand .brand__main{ color: var(--ink); font-size: 1.6rem; }
.closing__brand .brand__sub{ color: var(--muted); }
.closing__tagline{
  margin-block-start: 1.4rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--teal);
  letter-spacing: 0.04em;
}

/* =========================================================
   Footer
   ========================================================= */
footer{
  background: var(--ink-deep);
  color: var(--steel-light);
  padding-block: 2.2rem;
  font-size: 0.82rem;
}
.footer__inner{
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer__tags{
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--steel-light);
  opacity: 0.75;
}

/* =========================================================
   Scroll reveal
   ========================================================= */
.reveal{
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in{ opacity: 1; transform: none; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 980px){
  .who__grid{ grid-template-columns: 1fr; }
  .who__image{ order: -1; aspect-ratio: 16/9; }
  .pillars__grid{ grid-template-columns: repeat(2, 1fr); }
  .why__grid{ grid-template-columns: 1fr; }
  .process__track{ grid-template-columns: repeat(2, 1fr); row-gap: 2.2rem; }
  .process__track::before{ display: none; }
  .global__grid{ grid-template-columns: 1fr; }
  .global__images{ grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px){
  .nav-links{
    position: fixed;
    inset-inline: 0;
    top: 64px;
    background: var(--ink-deep);
    flex-direction: column;
    padding: 1.2rem var(--gutter) 1.6rem;
    gap: 1rem;
    border-bottom: 1px solid rgba(184,196,205,0.15);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  .nav-links.open{ opacity: 1; transform: none; pointer-events: auto; }
  .nav-links a{ font-size: 1rem; }
  .navtoggle{ display: block; }
  .who__stats{ grid-template-columns: 1fr; }
  .pillars__grid{ grid-template-columns: 1fr; }
  .process__track{ grid-template-columns: 1fr; }
  .global__images{ grid-template-columns: 1fr; }
  .manifest{ gap: 1.2rem 1.8rem; }
  .hero{ align-items: center; padding-block: 7rem 3rem; }
}

/* =========================================================
   RTL adjustments
   ========================================================= */
[dir="rtl"] .hero__title em{ font-style: normal; }
[dir="rtl"] .langswitch__btn svg{ transform: scaleX(-1); }