/* ============================================================
   سیرت گروپ — Luxury design system
   Warm graphite + champagne gold. RTL-first via logical properties.
   ============================================================ */

:root {
  /* palette */
  --ink: #0E0F12;
  --graphite: #15171B;
  --slate: #1C1F24;
  --hairline: #2C2F36;
  --gold: #C7A662;
  --champagne: #E7D6A8;
  --bronze: #977B4E;
  --pearl: #EDEAE3;
  --silver: #A29C90;
  --ash: #726C61;

  --gradient-gold: linear-gradient(135deg, var(--champagne), var(--gold) 45%, var(--bronze));

  /* type */
  --font-body: "Vazirmatn", system-ui, sans-serif;
  --font-latin: "Playfair Display", serif;

  /* rhythm */
  --container: 1200px;
  --section-y: clamp(4rem, 9vw, 9rem);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--ink);
  color: var(--pearl);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.4s var(--ease);
}

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

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

section {
  padding-block: var(--section-y);
}

/* ── typography ── */
h1,
h2,
h3 {
  font-weight: 300;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--pearl);
}

h1 { font-size: clamp(2.4rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 3rem); }

.overline {
  font-size: 0.8rem;
  letter-spacing: 0.35em;
  color: var(--gold);
}

.text-muted { color: var(--silver); }

.gold-text {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* hairline with a metallic accent segment */
.rule {
  height: 1px;
  background: var(--hairline);
  position: relative;
  max-width: 520px;
}

.rule::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 0;
  width: 56px;
  height: 1px;
  background: var(--gradient-gold);
}

/* ── buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 2rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  border: 1px solid var(--hairline);
  border-radius: 2px;
  cursor: pointer;
  /* Deliberately not `all`: that also animates visibility, which kept this
     button focusable for half a second after the mobile drawer closed. */
  transition: color 0.5s var(--ease), background 0.5s var(--ease),
              border-color 0.5s var(--ease), transform 0.5s var(--ease),
              filter 0.5s var(--ease);
}

.btn-gold {
  border-color: transparent;
  color: var(--ink);
  background: var(--gradient-gold);
}

.btn-gold:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--pearl);
}

.btn-ghost:hover {
  border-color: var(--gold);
  color: var(--champagne);
}

/* ── header ── */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 50;
  transition: background 0.5s var(--ease), backdrop-filter 0.5s var(--ease),
    border-color 0.5s var(--ease);
  border-block-end: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(14, 15, 18, 0.82);
  backdrop-filter: blur(14px);
  border-block-end-color: var(--hairline);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.4rem;
}

.brand__mark {
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--pearl);
}

.brand__sub {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--silver);
}

.nav {
  display: flex;
  align-items: center;
  gap: 2.4rem;
  font-size: 0.98rem;
}

.nav a:hover { color: var(--champagne); }
.nav__cta { color: var(--ink); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 4px;
}

.nav__toggle span {
  width: 26px;
  height: 1.5px;
  background: var(--pearl);
}

/* ── hero ── */
.hero {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  position: relative;
  background: radial-gradient(120% 120% at 82% 0%, #1b1d22 0%, var(--ink) 55%);
}

.hero__inner {
  padding-block-start: 8rem;
  max-width: 820px;
}

.hero__lead {
  font-size: 1.15rem;
  max-width: 54ch;
  margin-block: 2rem;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__rule {
  margin-block-start: 4rem;
}

/* ── inner page headers ── */
.page-head {
  padding-block: clamp(9rem, 16vw, 13rem) var(--section-y);
}

.page-head__lead {
  max-width: 56ch;
  margin-block: 1.6rem 3rem;
  font-size: 1.1rem;
}

/* ── footer ── */
.site-footer {
  border-block-start: 1px solid var(--hairline);
  background: var(--graphite);
  padding-block: var(--section-y) 2rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 3rem;
}

.footer__links,
.footer__contact {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.footer h4 {
  font-size: 0.8rem;
  letter-spacing: 0.25em;
  color: var(--gold);
  margin-block-end: 0.5rem;
}

.footer__tag {
  color: var(--silver);
  max-width: 28ch;
  margin-block-start: 1rem;
}

.footer__links a:hover,
.footer__legal a:hover { color: var(--champagne); }

.footer__bar {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-block-start: 3rem;
  padding-block-start: 2rem;
  border-block-start: 1px solid var(--hairline);
  font-size: 0.82rem;
  color: var(--ash);
}

/* ── reveal-on-scroll ── */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* stagger successive reveals within a block */
[data-reveal].is-visible { transition-delay: 0.05s; }

/* ── responsive ── */
@media (max-width: 820px) {
  .footer__grid { grid-template-columns: 1fr; gap: 2.4rem; }

  .nav__toggle { display: flex; }

  /* Drawer. inset-inline-end is logical (RTL -> anchored to the left edge)
     while translateX is physical, so the hidden offset must point the same way
     the panel is anchored — otherwise it slides *into* view instead of out.
     --nav-hidden keeps that correct in either direction. */
  .nav {
    --nav-hidden: -100%;
    position: fixed;
    inset-block-start: 0;
    inset-inline-end: 0;
    height: 100dvh;
    width: min(80vw, 340px);
    flex-direction: column;
    justify-content: center;
    gap: 2.4rem;
    background: var(--graphite);
    border-inline-start: 1px solid var(--hairline);
    transform: translateX(var(--nav-hidden));
    /* Closed: not paintable, not tabbable, not tappable. Visibility flips only
       after the slide finishes so the transition stays visible. */
    visibility: hidden;
    transition: transform 0.6s var(--ease), visibility 0s linear 0.6s;
  }

  .nav.is-open {
    transform: translateX(0);
    visibility: visible;
    transition: transform 0.6s var(--ease), visibility 0s;
  }
}

html[dir="ltr"] .nav { --nav-hidden: 100%; }

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
  /* Keep the drawer's own transform — clearing it would park the closed
     panel on top of the page, which is the bug this rule set fixes. */
  .nav { transform: translateX(var(--nav-hidden)); }
  .nav.is-open { transform: translateX(0); }
}