/* ============================================================
   ESC · Elite Solution Consulting — 官网 v0.1 演示稿
   设计语言：深藏青 × 香槟金 × 米白（editorial corporate）
   Display: Playfair Display (latin) + Songti/SimSun (CJK serif)
   Body: system sans (PingFang/YaHei)
   ============================================================ */

:root {
  --ink: #0B1B33;          /* deep navy */
  --navy: #0E2A4A;
  --navy-deep: #071323;
  --gold: #C6A15B;
  --gold-deep: #A8823F;
  --gold-soft: #E7D3A7;
  --paper: #F7F5EF;
  --cream: #FCFAF5;
  --white: #FFFFFF;
  --text: #25313D;
  --muted: #64717E;
  --line: #DFD9CB;
  --line-dark: rgba(255, 255, 255, .16);
  --font-display: "Playfair Display", "Songti SC", "SimSun", "STSong", "Noto Serif CJK SC", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-arabic: "Noto Naskh Arabic", "Geeza Pro", "Al Nile", "Al Bayan", "Traditional Arabic", "Segoe UI", Tahoma, "Noto Sans Arabic", "PingFang SC", sans-serif;
  --nav-h: 76px;
  --pad-x: clamp(20px, 5vw, 64px);
  --shadow-lg: 0 30px 80px -30px rgba(7, 19, 35, .45);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: 0; background: none; }

::selection { background: var(--gold); color: var(--navy-deep); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--pad-x); }
.container-narrow { max-width: 860px; margin: 0 auto; padding: 0 var(--pad-x); }

/* ---------- type ---------- */
.eyebrow {
  font-size: 12px;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--gold-deep);
  font-weight: 600;
}
.eyebrow--light { color: var(--gold-soft); }
h1, h2, h3, .display {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--navy);
  line-height: 1.18;
  letter-spacing: .01em;
}
.display-xl { font-size: clamp(2.7rem, 5.2vw, 4.4rem); }
.display-lg  { font-size: clamp(2.1rem, 3.6vw, 3.1rem); }
.display-md  { font-size: clamp(1.5rem, 2.4vw, 2rem); }
.lead {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 1.7vw, 1.4rem);
  line-height: 1.65;
  color: var(--navy);
}
.text-muted { color: var(--muted); }
.en-caps {
  font-size: 12px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 500;
}
.num-slab {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4vw, 3.6rem);
  line-height: 1;
  color: var(--gold);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .08em;
  border-radius: 0;
  transition: all .25s ease;
  white-space: nowrap;
}
.btn-gold { background: var(--gold); color: var(--navy-deep); }
.btn-gold:hover { background: var(--gold-deep); color: var(--white); }
.btn-navy { background: var(--navy); color: var(--white); }
.btn-navy:hover { background: var(--ink); }
.btn-ghost { border: 1px solid rgba(255,255,255,.55); color: #fff; }
.btn-ghost:hover { background: #fff; color: var(--navy-deep); }
.btn-ghost-dark { border: 1px solid var(--navy); color: var(--navy); }
.btn-ghost-dark:hover { background: var(--navy); color: #fff; }
.btn .arrow { transition: transform .25s ease; }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- nav ---------- */
.site-nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--nav-h);
  transition: background .3s ease, box-shadow .3s ease;
  color: #fff;
}
.site-nav.scrolled { background: rgba(7, 19, 35, .92); backdrop-filter: blur(14px); box-shadow: 0 1px 0 var(--line-dark); }
.site-nav .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 40px; height: 40px; flex: none;
  border: 1px solid var(--gold);
  display: grid; place-items: center;
  font-family: var(--font-display);
  font-size: 21px; color: var(--gold);
  background: rgba(11, 27, 51, .35);
}
.brand-mark-img {
  width: 44px; height: 44px; flex: none;
  background: #fff;
  display: grid; place-items: center;
  padding: 3px;
  box-shadow: 0 2px 10px rgba(7,19,35,.25);
}
.brand-mark-img img { width: 100%; height: 100%; object-fit: contain; }
.brand-text b { display: block; font-size: 14px; font-weight: 700; letter-spacing: .12em; color: #fff; font-family: var(--font-display); }
.brand-text b em { font-style: normal; color: var(--gold-soft); }
.brand-text span { display: block; font-size: 12px; letter-spacing: .18em; color: rgba(255,255,255,.85); margin-top: 1px; }
.nav-links { display: flex; align-items: center; gap: 38px; }
.nav-links a.nav-item {
  font-size: 15px; letter-spacing: .06em; color: rgba(255,255,255,.92);
  position: relative; padding: 6px 0;
}
.nav-links a.nav-item::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--gold); transition: width .3s ease;
}
.nav-links a.nav-item:hover::after, .nav-links a.nav-item.active::after { width: 100%; }
.nav-links a.nav-item.active { color: var(--gold-soft); }
.nav-cta { padding: 11px 22px; font-size: 14px; }
.nav-burger { display: none; flex-direction: column; gap: 6px; padding: 8px; }
.nav-burger span { width: 24px; height: 2px; background: #fff; transition: .3s; }
.nav-burger.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: 0; z-index: 99;
  background: var(--navy-deep);
  display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 8px;
  opacity: 0; pointer-events: none; transition: opacity .3s ease;
}
.mobile-menu.open { opacity: 1; pointer-events: auto; }
.mobile-menu a {
  font-family: var(--font-display);
  font-size: 1.9rem; color: #fff; padding: 12px 0;
  border-bottom: 1px solid transparent;
}
.mobile-menu a:hover { color: var(--gold-soft); }

/* ---------- hero carousel ---------- */
.carousel { position: relative; height: min(100vh, 1000px); min-height: 620px; overflow: hidden; background: var(--navy-deep); }
.slide { position: absolute; inset: 0; opacity: 0; transition: opacity 1.4s ease; z-index: 1; }
.slide.active { opacity: 1; z-index: 2; }
.slide-media {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
/* light readability scrim only (keeps the raw-video feel) */
.slide::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(7,19,35,.32) 0%, rgba(7,19,35,.10) 38%, rgba(7,19,35,.42) 72%, rgba(7,19,35,.72) 100%),
    linear-gradient(90deg, rgba(7,19,35,.30) 0%, rgba(7,19,35,.05) 45%);
}
.slide-body {
  position: relative; z-index: 3; height: 100%;
  display: flex; flex-direction: column; justify-content: flex-end;
  max-width: 1200px; margin: 0 auto; padding: 0 var(--pad-x);
  padding-top: 90px;
  padding-bottom: 128px;
}
.slide-body > * { opacity: 0; transform: translateY(16px); transition: opacity .7s ease, transform .7s ease; }
.slide.active .slide-body > * { opacity: 1; transform: none; }
.slide.active .slide-body > *:nth-child(1) { transition-delay: .10s; }
.slide.active .slide-body > *:nth-child(2) { transition-delay: .25s; }
.slide.active .slide-body > *:nth-child(3) { transition-delay: .40s; }
.slide.active .slide-body > *:nth-child(4) { transition-delay: .55s; }
.slide.active .slide-body > *:nth-child(5) { transition-delay: .70s; }
.slide-body .eyebrow { margin-bottom: 22px; display: flex; align-items: center; gap: 16px; }
.slide-body .eyebrow::before { content: ""; width: 44px; height: 1px; background: var(--gold); }
.slide-body h1 { color: #fff; max-width: 15em; margin-bottom: 22px; text-shadow: 0 2px 30px rgba(0,0,0,.25); }
.slide-body .slide-sub { color: rgba(255,255,255,.88); font-size: clamp(1rem, 1.4vw, 1.18rem); max-width: 40em; }
.slide-body .slide-actions { display: flex; gap: 14px; margin-top: 38px; flex-wrap: wrap; }
.slide--en h1 { max-width: 20em; }

/* ---------- Arabic (RTL) hero slide ---------- */
.slide--ar .slide-body { direction: rtl; text-align: right; align-items: flex-start; }
.slide--ar .slide-body .eyebrow {
  font-family: var(--font-arabic);
  font-size: 14px; letter-spacing: 0; text-transform: none;
}
.slide--ar .slide-body h1 {
  font-family: var(--font-arabic);
  font-weight: 700; line-height: 1.5; letter-spacing: 0;
  max-width: 24em;
}
.slide--ar .slide-body .slide-sub {
  font-family: var(--font-arabic);
  line-height: 2; letter-spacing: 0; max-width: 36em;
}
.slide--ar .btn { font-family: var(--font-arabic); letter-spacing: 0; }
.slide--ar .btn .arrow { margin-right: 8px; margin-left: 0; }

.carousel-dots {
  position: absolute; z-index: 5; bottom: 34px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 12px;
}
.carousel-dots button {
  width: 9px; height: 9px; border-radius: 50%;
  background: rgba(255,255,255,.35); transition: .3s;
}
.carousel-dots button.active { background: var(--gold); transform: scale(1.25); }
.carousel-arrow {
  position: absolute; z-index: 5; top: 50%; transform: translateY(-50%);
  width: 52px; height: 52px; border: 1px solid rgba(255,255,255,.35);
  color: #fff; font-size: 20px; display: grid; place-items: center;
  transition: .3s; background: rgba(7,19,35,.2);
}
.carousel-arrow:hover { background: var(--gold); color: var(--navy-deep); border-color: var(--gold); }
.carousel-arrow.prev { left: 28px; }
.carousel-arrow.next { right: 28px; }

/* ---------- page hero (inner pages) ---------- */
.page-hero {
  position: relative; min-height: 46vh; display: flex; align-items: flex-end;
  color: #fff; padding: calc(var(--nav-h) + 60px) 0 70px; overflow: hidden;
}
.page-hero .ph-bg {
  position: absolute; inset: 0; background-size: cover; background-position: center;
}
.page-hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(7,19,35,.62), rgba(7,19,35,.25) 55%, rgba(7,19,35,.82));
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero .crumb { font-size: 12.5px; letter-spacing: .3em; text-transform: uppercase; color: rgba(255,255,255,.75); margin-bottom: 14px; }
.page-hero .crumb i { color: var(--gold-soft); font-style: normal; }
.page-hero h1 { color: #fff; margin-bottom: 14px; }
.page-hero p { color: rgba(255,255,255,.85); max-width: 42em; }

/* ---------- sections ---------- */
.section { padding: clamp(72px, 9vw, 128px) 0; }
.section--paper { background: var(--paper); }
.section--cream { background: var(--cream); }
.section--navy { background: var(--navy-deep); color: rgba(255,255,255,.85); }
.section--navy h2, .section--navy h3 { color: #fff; }
.section-head { max-width: 760px; margin-bottom: clamp(44px, 6vw, 76px); }
.section-head .eyebrow { margin-bottom: 20px; display: block; }
.section-head p { margin-top: 18px; max-width: 58em; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* intro / lead pair */
.intro-pair { display: grid; grid-template-columns: 1fr 1.2fr; gap: clamp(36px, 6vw, 90px); align-items: start; }
.intro-pair .lead-col .en-caps { margin-bottom: 26px; display: block; }
.divider-gold { width: 58px; height: 2px; background: var(--gold); margin: 26px 0 0; }

/* capability rows */
.cap-row {
  display: grid; grid-template-columns: 120px 300px 1fr; gap: 26px; align-items: baseline;
  padding: 30px 0; border-bottom: 1px solid var(--line);
}
.cap-row:first-of-type { border-top: 1px solid var(--line); }
.cap-row h3 { font-size: 1.32rem; }
.cap-row .cap-no { font-family: var(--font-display); font-size: 1.05rem; color: var(--gold-deep); letter-spacing: .1em; padding-top: 6px; }
.cap-row p { color: var(--muted); max-width: 52ch; }

/* logo wall */
.logo-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.logo-tile {
  background: var(--white); border: 1px solid var(--line);
  padding: 34px 24px; display: flex; flex-direction: column; align-items: center; gap: 14px;
  text-align: center; transition: .3s; min-height: 190px; justify-content: center;
}
.logo-tile:hover { border-color: var(--gold); box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.logo-tile .mono {
  width: 54px; height: 54px; border: 1px solid var(--gold);
  display: grid; place-items: center;
  font-family: var(--font-display); font-size: 26px; color: var(--navy);
}
.logo-tile img.lo { max-height: 44px; max-width: 80%; object-fit: contain; }
.logo-tile b { font-size: 16.5px; color: var(--navy); font-weight: 700; }
.logo-tile span { font-size: 12px; color: var(--muted); letter-spacing: .12em; text-transform: uppercase; }
.tile-note { margin-top: 26px; font-size: 12.5px; color: var(--muted); }

/* client case cards */
.case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(26px, 4vw, 52px); }
.case-card { background: var(--white); border: 1px solid var(--line); transition: .35s; display: flex; flex-direction: column; }
.case-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: rgba(198,161,91,.5); }
.case-media { aspect-ratio: 16 / 10; overflow: hidden; }
.case-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s ease; }
.case-card:hover .case-media img { transform: scale(1.05); }
.case-body { padding: 30px 32px 34px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.case-body .co-logo { max-height: 42px; width: auto; max-width: 55%; object-fit: contain; margin: 4px 0 2px; }
.case-body .tag { align-self: flex-start; font-size: 12px; letter-spacing: .22em; color: var(--gold-deep); text-transform: uppercase; border: 1px solid var(--gold); padding: 4px 12px; }
.case-body h3 { font-size: 1.4rem; }
.case-body .co-en { font-size: 12.5px; letter-spacing: .18em; text-transform: uppercase; color: var(--muted); }
.case-body p { color: var(--muted); font-size: 15px; }
.case-body .todo-line { margin-top: auto; font-size: 12.5px; color: var(--gold-deep); border-top: 1px dashed var(--line); padding-top: 14px; }

/* services list */
.svc-item {
  display: grid; grid-template-columns: 110px 1fr; gap: 30px;
  padding: clamp(30px, 4vw, 48px) 0; border-bottom: 1px solid var(--line);
}
.svc-item:first-of-type { border-top: 1px solid var(--line); }
.svc-item h3 { font-size: clamp(1.3rem, 2vw, 1.7rem); margin-bottom: 10px; }
.svc-item .svc-desc { color: var(--muted); max-width: 58ch; }

/* quote band */
.band-quote { background: var(--navy); color: #fff; position: relative; overflow: hidden; }
.band-quote::before {
  content: "“"; position: absolute; top: -30px; left: 20px;
  font-family: var(--font-display); font-size: 340px; color: rgba(255,255,255,.05); line-height: 1;
}
.band-quote .q-body { font-family: var(--font-display); font-size: clamp(1.5rem, 2.6vw, 2.2rem); line-height: 1.5; max-width: 22em; }
.band-quote .q-sub { margin-top: 24px; color: var(--gold-soft); letter-spacing: .2em; font-size: 13px; text-transform: uppercase; }

/* feature mini list (why us) */
.feat-list > li { display: grid; grid-template-columns: 34px 1fr; gap: 22px; padding: 26px 0; border-bottom: 1px solid var(--line); }
.feat-list > li:first-child { border-top: 1px solid var(--line); }
.feat-list .fk { font-family: var(--font-display); color: var(--gold); font-size: 1.15rem; padding-top: 3px; }
.feat-list b { display: block; color: var(--navy); font-size: 1.1rem; margin-bottom: 4px; }
.feat-list span { color: var(--muted); font-size: 15px; }

/* split media-text */
.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(40px, 6vw, 90px); align-items: center; }
.split .media { overflow: hidden; }
.split .media img { width: 100%; height: 100%; object-fit: cover; }
.split .media--ratio { aspect-ratio: 4/3.2; }
.frame-gold { outline: 1px solid rgba(198,161,91,.4); outline-offset: 12px; }

/* CTA band */
.cta-band { position: relative; overflow: hidden; color: #fff; }
.cta-band .cta-bg { position: absolute; inset: 0; background-size: cover; background-position: center; }
.cta-band::after { content: ""; position: absolute; inset: 0; background: linear-gradient(100deg, rgba(7,19,35,.93) 20%, rgba(7,19,35,.62) 70%, rgba(7,19,35,.35)); }
.cta-band .container { position: relative; z-index: 2; padding-top: clamp(70px, 8vw, 110px); padding-bottom: clamp(70px, 8vw, 110px); }
.cta-band h2 { color: #fff; margin: 16px 0; max-width: 16em; }
.cta-band p { color: rgba(255,255,255,.85); max-width: 44em; }
.cta-band .row-actions { display: flex; gap: 16px; margin-top: 36px; flex-wrap: wrap; }

/* ---------- footer / contact ---------- */
.site-footer { background: var(--navy-deep); color: rgba(255,255,255,.8); }
.contact-top { padding: clamp(70px, 8vw, 110px) 0 60px; }
.contact-top .section-head p { color: rgba(255,255,255,.75); }
.contact-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 44px; margin-top: 50px; }
.contact-col h4 { font-size: 12.5px; letter-spacing: .3em; text-transform: uppercase; color: var(--gold-soft); font-weight: 600; margin-bottom: 20px; }
.contact-col b { display: block; font-family: var(--font-display); font-size: 1.35rem; color: #fff; margin-bottom: 10px; font-weight: 600; }
.contact-col li { font-size: 15px; padding: 5px 0; color: rgba(255,255,255,.75); }
.contact-col li i { font-style: normal; color: var(--gold); margin-right: 4px; }
.contact-col .todo { color: rgba(255,255,255,.45); font-style: italic; }
.footer-bottom {
  border-top: 1px solid var(--line-dark);
  padding: 26px 0; font-size: 13px; color: rgba(255,255,255,.55);
  display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap;
}
.footer-bottom a:hover { color: var(--gold-soft); }
.todo-mark {
  border-bottom: 1px dashed var(--gold); cursor: help;
}

/* ---------- reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s ease; }
[data-reveal].is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .slide-body > *, .slide.active .slide-body > * { opacity: 1; transform: none; transition: none; transition-delay: 0s !important; }
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .intro-pair, .split { grid-template-columns: 1fr; }
  .split .media { order: -1; }
  .cap-row { grid-template-columns: 70px 1fr; }
  .cap-row p { grid-column: 2; }
  .logo-strip { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; }
  .contact-col:first-child { grid-column: 1 / -1; }
  .nav-links, .nav-cta { display: none; }
  .nav-burger { display: flex; }
}
@media (max-width: 640px) {
  .case-grid, .logo-strip { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-col:first-child { grid-column: auto; }
  .svc-item { grid-template-columns: 1fr; gap: 8px; }
  .carousel-arrow { display: none; }
  .slide-body { padding-bottom: 104px; }
  .cap-row { grid-template-columns: 1fr; }
  .cap-row p { grid-column: 1; }
}