/* ==========================================================================
   isamahdi.studio — v4
   base.css · نظام التصميم الأساسي
   المرحلة 1 — لا يحتوي أي أنماط خاصة بصفحة بعينها
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. الرموز التصميمية (Design Tokens)
   -------------------------------------------------------------------------- */

:root {
  /* الألوان */
  --ink:        #14161A;
  --ink-soft:   #1C1F24;
  --ink-deep:   #0E0F12;
  --gold:       #C9A24B;
  --gold-dim:   #8A6F33;
  --bone:       #EDE8DF;
  --bone-dim:   #9A958C;

  --line:       rgba(237, 232, 223, 0.12);
  --line-soft:  rgba(237, 232, 223, 0.06);
  --gold-glow:  rgba(201, 162, 75, 0.18);

  /* الخطوط */
  --font-display: "Bodoni Moda", "Playfair Display", Georgia, serif;
  --font-body:    "Instrument Sans", "Inter", system-ui, -apple-system, sans-serif;
  --font-mono:    "JetBrains Mono", "SFMono-Regular", Menlo, monospace;
  --font-arabic:  "IBM Plex Sans Arabic", "Segoe UI", Tahoma, sans-serif;

  /* سلم الأحجام */
  --step--1: clamp(0.78rem, 0.76rem + 0.10vw, 0.84rem);
  --step-0:  clamp(0.95rem, 0.92rem + 0.15vw, 1.05rem);
  --step-1:  clamp(1.15rem, 1.08rem + 0.35vw, 1.40rem);
  --step-2:  clamp(1.45rem, 1.30rem + 0.75vw, 2.05rem);
  --step-3:  clamp(1.90rem, 1.60rem + 1.50vw, 3.10rem);
  --step-4:  clamp(2.40rem, 1.85rem + 2.75vw, 4.60rem);
  --step-5:  clamp(3.00rem, 2.00rem + 5.00vw, 7.00rem);

  /* المسافات */
  --sp-1: 0.5rem;
  --sp-2: 1rem;
  --sp-3: 1.5rem;
  --sp-4: 2.5rem;
  --sp-5: 4rem;
  --sp-6: 6rem;
  --sp-7: 9rem;

  /* التخطيط */
  --wrap:     1440px;
  --wrap-mid: 1080px;
  --wrap-read: 68ch;
  --gutter:   clamp(1.25rem, 4vw, 4rem);
  --header-h: 72px;

  /* الحركة */
  --ease:      cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:   cubic-bezier(0.7, 0, 0.84, 0);
  --dur-fast:  240ms;
  --dur-base:  450ms;
  --dur-slow:  700ms;

  --radius: 2px;
  --z-header: 100;
  --z-progress: 110;
  --z-overlay: 200;
}

/* --------------------------------------------------------------------------
   2. إعادة الضبط (Reset)
   -------------------------------------------------------------------------- */

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

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

body {
  margin: 0;
  background-color: var(--ink);
  color: var(--bone);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, video, svg, iframe { display: block; max-width: 100%; }
img, video { height: auto; }

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

h1, h2, h3, h4, p, figure, blockquote { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

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

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

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   3. الطباعة (Typography)
   -------------------------------------------------------------------------- */

.display,
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

h1, .t-hero  { font-size: var(--step-5); }
h2, .t-major { font-size: var(--step-4); }
h3, .t-mid   { font-size: var(--step-2); }

.t-lead {
  font-size: var(--step-1);
  line-height: 1.5;
  color: var(--bone);
  max-width: var(--wrap-read);
}

.t-body {
  max-width: var(--wrap-read);
  color: var(--bone-dim);
}

.t-body strong { color: var(--bone); font-weight: 600; }

/* التايم كود — العنصر المميّز في هوية الموقع */
.tc {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bone-dim);
  font-variant-numeric: tabular-nums;
}

.tc--gold { color: var(--gold); }

.tc-rule {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.tc-rule::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--line);
}

/* --------------------------------------------------------------------------
   4. التخطيط (Layout)
   -------------------------------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--mid { max-width: var(--wrap-mid); }

.section {
  padding-block: var(--sp-6);
  position: relative;
}

.section--tight { padding-block: var(--sp-5); }
.section--tall  { padding-block: var(--sp-7); }
.section--soft  { background-color: var(--ink-soft); }

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-block-end: var(--sp-4);
}

.grid {
  display: grid;
  gap: var(--sp-3);
  grid-template-columns: repeat(12, 1fr);
}

.grid--gallery {
  grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
}

.grid--split {
  grid-template-columns: repeat(auto-fit, minmax(min(340px, 100%), 1fr));
  gap: var(--sp-4);
}

.stack     { display: flex; flex-direction: column; gap: var(--sp-2); }
.stack--lg { gap: var(--sp-4); }
.row       { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-2); }

/* --------------------------------------------------------------------------
   5. الأزرار
   -------------------------------------------------------------------------- */

.btn {
  --btn-fg: var(--ink);
  --btn-bg: var(--gold);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  padding: 0.85em 1.7em;
  border: 1px solid var(--btn-bg);
  border-radius: var(--radius);
  background-color: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    background-color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease);
}

.btn:hover {
  background-color: transparent;
  color: var(--gold);
  transform: translateY(-1px);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--bone);
  border-color: var(--line);
}

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

/* رابط بخط سفلي متحرك */
.link {
  position: relative;
  color: var(--bone);
  transition: color var(--dur-fast) var(--ease);
}

.link::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  bottom: -3px;
  width: 100%;
  height: 1px;
  background-color: var(--gold);
  transform: scaleX(0);
  transform-origin: inline-start;
  transition: transform var(--dur-base) var(--ease);
}

.link:hover { color: var(--gold); }
.link:hover::after { transform: scaleX(1); }

/* --------------------------------------------------------------------------
   6. الوسائط
   -------------------------------------------------------------------------- */

.media {
  position: relative;
  overflow: hidden;
  background-color: var(--ink-soft);
  border-radius: var(--radius);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid var(--line-soft);
  pointer-events: none;
}

.media--16x9  { aspect-ratio: 16 / 9; }
.media--4x5   { aspect-ratio: 4 / 5; }
.media--1x1   { aspect-ratio: 1 / 1; }
.media--cine  { aspect-ratio: 2.39 / 1; }

.media > img,
.media > video,
.media > iframe {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: 0;
}

/* --------------------------------------------------------------------------
   7. بطاقة المشروع
   -------------------------------------------------------------------------- */

.card {
  display: block;
  position: relative;
  isolation: isolate;
}

.card__media {
  overflow: hidden;
  margin-block-end: var(--sp-2);
}

.card__media img,
.card__media video {
  transition: transform var(--dur-slow) var(--ease), filter var(--dur-slow) var(--ease);
  filter: saturate(0.85);
}

.card:hover .card__media img,
.card:hover .card__media video {
  transform: scale(1.04);
  filter: saturate(1);
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--step-2);
  line-height: 1.15;
  transition: color var(--dur-fast) var(--ease);
}

.card:hover .card__title { color: var(--gold); }

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em 1.1em;
  margin-block-start: 0.4em;
}

/* --------------------------------------------------------------------------
   8. الهيدر
   -------------------------------------------------------------------------- */

.header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: var(--z-header);
  height: var(--header-h);
  display: flex;
  align-items: center;
  background-color: transparent;
  transition:
    background-color var(--dur-base) var(--ease),
    border-color var(--dur-base) var(--ease);
  border-block-end: 1px solid transparent;
}

.header.is-stuck {
  background-color: rgba(20, 22, 26, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-block-end-color: var(--line);
}

.header__inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
}

.brand {
  font-family: var(--font-display);
  font-size: var(--step-1);
  letter-spacing: 0.01em;
  line-height: 1;
  white-space: nowrap;
}

.brand em {
  font-style: normal;
  color: var(--gold);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bone-dim);
  transition: color var(--dur-fast) var(--ease);
}

.nav__link:hover,
.nav__link[aria-current="page"] { color: var(--bone); }

.nav__link[aria-current="page"] { color: var(--gold); }

.lang {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  color: var(--bone-dim);
  padding: 0.4em 0.8em;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.lang:hover { border-color: var(--gold); color: var(--gold); }

/* زر القائمة على الجوال */
.burger {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  position: relative;
}

.burger span {
  position: absolute;
  inset-inline: 8px;
  height: 1px;
  background-color: var(--bone);
  transition: transform var(--dur-base) var(--ease), opacity var(--dur-fast) var(--ease);
}

.burger span:nth-child(1) { top: 15px; }
.burger span:nth-child(2) { top: 24px; }

.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { transform: translateY(-4.5px) rotate(-45deg); }

/* --------------------------------------------------------------------------
   9. قائمة الجوال
   -------------------------------------------------------------------------- */

.menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background-color: var(--ink-deep);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--sp-3);
  padding: var(--gutter);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease), visibility var(--dur-base);
}

.menu.is-open { opacity: 1; visibility: visible; }

.menu__link {
  font-family: var(--font-display);
  font-size: var(--step-3);
  line-height: 1.1;
  color: var(--bone);
  transition: color var(--dur-fast) var(--ease);
}

.menu__link:hover { color: var(--gold); }

/* --------------------------------------------------------------------------
   10. شريط التقدّم الذهبي
   -------------------------------------------------------------------------- */

.progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline-start: 0;
  z-index: var(--z-progress);
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: inline-start;
  background: linear-gradient(90deg, var(--gold-dim), var(--gold));
  will-change: transform;
}

/* --------------------------------------------------------------------------
   11. الفوتر
   -------------------------------------------------------------------------- */

.footer {
  background-color: var(--ink-deep);
  border-block-start: 1px solid var(--line);
  padding-block: var(--sp-5) var(--sp-3);
}

.footer__grid {
  display: grid;
  gap: var(--sp-4);
  grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr));
  margin-block-end: var(--sp-4);
}

.footer__note {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--sp-2);
  padding-block-start: var(--sp-3);
  border-block-start: 1px solid var(--line-soft);
}

/* --------------------------------------------------------------------------
   12. الحركة والكشف عند التمرير
   -------------------------------------------------------------------------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--dur-slow) var(--ease),
    transform var(--dur-slow) var(--ease);
}

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

[data-reveal-delay="1"] { transition-delay: 80ms; }
[data-reveal-delay="2"] { transition-delay: 160ms; }
[data-reveal-delay="3"] { transition-delay: 240ms; }

/* الستارة السينمائية التمهيدية */
.curtain {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  pointer-events: none;
}

.curtain__bar {
  position: absolute;
  inset-inline: 0;
  height: 50%;
  background-color: var(--ink-deep);
  transition: transform 1100ms var(--ease);
}

.curtain__bar--top    { top: 0; }
.curtain__bar--bottom { bottom: 0; }

.curtain.is-open .curtain__bar--top    { transform: translateY(-100%); }
.curtain.is-open .curtain__bar--bottom { transform: translateY(100%); }

/* --------------------------------------------------------------------------
   13. الأدوات المساعدة
   -------------------------------------------------------------------------- */

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip {
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 0;
  z-index: calc(var(--z-overlay) + 1);
  padding: 0.8em 1.4em;
  background-color: var(--gold);
  color: var(--ink);
  transform: translateY(-120%);
  transition: transform var(--dur-fast) var(--ease);
}

.skip:focus { transform: none; }

.muted   { color: var(--bone-dim); }
.gold    { color: var(--gold); }
.center  { text-align: center; }
.mt-auto { margin-block-start: auto; }

/* --------------------------------------------------------------------------
   14. النسخة العربية (RTL)
   -------------------------------------------------------------------------- */

[dir="rtl"] {
  --font-display: var(--font-arabic);
  --font-body: var(--font-arabic);
}

[dir="rtl"] body { line-height: 1.85; }

[dir="rtl"] .display,
[dir="rtl"] h1,
[dir="rtl"] h2,
[dir="rtl"] h3 {
  letter-spacing: 0;
  line-height: 1.25;
  font-weight: 600;
}

/* التايم كود يبقى لاتينيًا في النسختين — جزء من الهوية */
[dir="rtl"] .tc,
[dir="rtl"] .btn,
[dir="rtl"] .nav__link,
[dir="rtl"] .lang {
  font-family: var(--font-mono);
  direction: ltr;
}

/* --------------------------------------------------------------------------
   15. نقاط الانكسار (Breakpoints)
   -------------------------------------------------------------------------- */

@media (max-width: 860px) {
  :root { --header-h: 60px; }

  .nav { display: none; }
  .burger { display: block; }

  .section       { padding-block: var(--sp-5); }
  .section--tall { padding-block: var(--sp-6); }
}

@media (min-width: 861px) {
  .menu { display: none; }
}

/* --------------------------------------------------------------------------
   16. احترام تقليل الحركة — إلزامي
   -------------------------------------------------------------------------- */

@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;
  }

  [data-reveal] { opacity: 1; transform: none; }
  .curtain { display: none; }
}