/* ============================================================
   Abdalla Maher — Portfolio  |  Pentagram-Enhanced Style
   ============================================================ */

/* --- Design Tokens --- */
:root {
  --c-black: #0A0A0A;
  --c-white: #FAFAF8;
  --c-accent: #D53829;
  --c-accent-on-dark: #E0422E;
  --c-accent-dim: rgba(213, 56, 41, 0.15);
  --c-grid: rgba(255, 255, 255, 0.06);
  --c-border: rgba(255, 255, 255, 0.10);
  --c-text: rgba(250, 250, 248, 0.88);
  --c-text-dim: rgba(250, 250, 248, 0.55);
  --c-bg-alt: #111111;

  --f-body: 'IBM Plex Sans', 'IBM Plex Sans Arabic', 'Noto Sans TC', sans-serif;
  --f-heading: 'IBM Plex Sans', 'IBM Plex Sans Arabic', 'Noto Sans TC', sans-serif;
  --f-mono: 'IBM Plex Mono', monospace;

  --grid-cols: 12;
  --grid-gap: 1px;
  --container: 1280px;
  --section-pad: clamp(60px, 10vw, 120px);

  --radius: 2px;
  --transition: 0.2s ease;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-black);
  min-height: 100vh;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* --- Focus --- */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}

/* --- Container --- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
}

/* --- Grid Divider Lines (Swiss 1px) --- */
.section-header,
.services-grid,
.work-grid,
.skills-grid,
.contact-grid,
.about-grid,
.footer-grid {
  position: relative;
}

/* --- Typography --- */
h1, h2, h3 {
  font-family: var(--f-heading);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(36px, 6vw, 72px); }
h2 { font-size: clamp(28px, 4vw, 56px); }
h3 { font-size: clamp(18px, 2.5vw, 28px); }
p { max-width: 65ch; }
.accent { color: var(--c-accent-on-dark); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius);
  transition: all var(--transition);
}
.btn-primary {
  background: var(--c-accent);
  color: var(--c-white);
}
.btn-primary:hover {
  background: #b92d20;
  transform: translateY(-1px);
}
.btn-outline {
  border: 1px solid var(--c-border);
  color: var(--c-white);
}
.btn-outline:hover {
  border-color: var(--c-accent-on-dark);
  color: var(--c-accent-on-dark);
}

/* ===================== NAVBAR ===================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-grid);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  font-family: var(--f-heading);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-dim);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--c-accent-on-dark); }
.nav-actions { display: flex; align-items: center; gap: 16px; }

/* Language Switcher */
.lang-switcher { display: flex; gap: 4px; }
.lang-btn {
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  font-family: var(--f-mono);
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  transition: all var(--transition);
  color: var(--c-text-dim);
}
.lang-btn:hover { color: var(--c-white); }
.lang-btn.active {
  background: var(--c-accent);
  color: var(--c-white);
}

/* Mobile Menu */
.menu-toggle { display: none; }

/* ===================== HERO ===================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-label {
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent-on-dark);
  margin-bottom: 16px;
}
.hero-title {
  margin-bottom: 20px;
  letter-spacing: -0.04em;
}
.hero-desc {
  font-size: 18px;
  line-height: 1.7;
  color: var(--c-text-dim);
  margin-bottom: 40px;
}
.hero-stats {
  display: flex;
  gap: 40px;
  margin-bottom: 40px;
}
.stat-num {
  display: block;
  font-family: var(--f-mono);
  font-size: 36px;
  font-weight: 500;
  color: var(--c-white);
  line-height: 1;
}
.stat-label {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-text-dim);
  margin-top: 6px;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-visual {
  position: relative;
  height: 400px;
}
.hero-accent-line {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 100%;
  background: var(--c-accent);
}
.hero-accent-line::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 1px;
  width: clamp(200px, 30vw, 400px);
  height: 1px;
  background: var(--c-grid);
}
.hero-accent-line::after {
  content: '';
  position: absolute;
  bottom: 30%;
  left: 1px;
  width: clamp(150px, 20vw, 300px);
  height: 1px;
  background: var(--c-grid);
}

/* ===================== SECTIONS ===================== */
section {
  padding: var(--section-pad) 0;
  border-top: 1px solid var(--c-grid);
}
.section-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 48px;
}
.section-num {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--c-accent-on-dark);
}
.section-title {
  position: relative;
}

/* ===================== ABOUT ===================== */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 60px;
}
.about-text p { margin-bottom: 20px; }
.about-meta {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-left: 40px;
  border-left: 1px solid var(--c-grid);
}
.meta-label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-text-dim);
  margin-bottom: 4px;
}
.meta-value {
  font-size: 16px;
  font-weight: 500;
}

/* ===================== SERVICES ===================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
}
.service-card {
  padding: 32px 24px;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-grid);
  transition: all var(--transition);
}
.service-card:hover {
  background: var(--c-black);
  border-color: var(--c-accent-on-dark);
}
.service-icon {
  margin-bottom: 20px;
  color: var(--c-accent-on-dark);
}
.service-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
}
.service-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-dim);
}

/* ===================== WORK ===================== */
.work-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
}
.project-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-grid);
  transition: all var(--transition);
  overflow: hidden;
}
.project-card:hover {
  border-color: rgba(213, 56, 41, 0.4);
}
.project-img-wrap {
  overflow: hidden;
  aspect-ratio: 3/2;
}
.project-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.project-card:hover .project-img-wrap img {
  transform: scale(1.03);
}
.project-info {
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.project-tag {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-accent-on-dark);
  margin-bottom: 8px;
}
.project-info h3 {
  font-size: 20px;
  margin-bottom: 12px;
}
.project-info p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-dim);
  margin-bottom: 16px;
  flex: 1;
}
.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--c-accent-on-dark);
  transition: gap var(--transition);
}
.project-link:hover { gap: 10px; }

/* ===================== SKILLS ===================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
}
.skill-group {
  padding: 32px 28px;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-grid);
}
.skill-group h3 {
  font-size: 16px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-grid);
}
.skill-list li {
  font-size: 14px;
  padding: 8px 0;
  border-bottom: 1px solid var(--c-grid);
  color: var(--c-text-dim);
  transition: color var(--transition);
}
.skill-list li:last-child { border-bottom: none; }
.skill-list li:hover { color: var(--c-white); }

/* ===================== CONTACT ===================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 60px;
  max-width: 560px;
  margin: 0 auto;
}
.contact-form { display: flex; flex-direction: column; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-dim);
}
.form-group input,
.form-group textarea {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  padding: 12px 16px;
  color: var(--c-white);
  font-family: var(--f-body);
  font-size: 15px;
  border-radius: var(--radius);
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--c-accent-on-dark);
  outline: none;
}
.form-group textarea { resize: vertical; }
.form-status {
  font-size: 13px;
  margin-top: 8px;
}
.form-status.success { color: #2ecc71; }
.form-status.error { color: var(--c-accent-on-dark); }

.contact-social {
  padding-left: 0;
  border-left: none;
}
.social-intro {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-text-dim);
  margin-bottom: 24px;
}
.social-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}
.social-links a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--c-text-dim);
  transition: color var(--transition);
}
.social-links a:hover { color: var(--c-accent-on-dark); }
.social-links svg { flex-shrink: 0; }

.contact-email a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--c-text-dim);
  transition: color var(--transition);
}
.contact-email a:hover { color: var(--c-accent-on-dark); }

/* ===================== FOOTER ===================== */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--c-grid);
}
.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.footer-brand p {
  font-size: 13px;
  color: var(--c-text-dim);
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  font-size: 13px;
  color: var(--c-text-dim);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--c-accent-on-dark); }
.footer-copy p {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--c-text-dim);
}

/* ===================== RTL (Arabic) ===================== */
html[dir="rtl"] {
  --f-body: 'IBM Plex Sans Arabic', 'IBM Plex Sans', 'Noto Sans TC', sans-serif;
  --f-heading: 'Amiri', 'IBM Plex Sans Arabic', serif;
}
html[dir="rtl"] .hero-stats { direction: rtl; }
html[dir="rtl"] .about-meta {
  padding-left: 0;
  padding-right: 40px;
  border-left: none;
  border-right: 1px solid var(--c-grid);
}
html[dir="rtl"] .contact-social {
  padding-right: 0;
  border-right: none;
}

/* ===================== zh-TW ===================== */
html[lang="zh-TW"] {
  --f-body: 'Noto Sans TC', 'IBM Plex Sans', sans-serif;
  --f-heading: 'Noto Sans TC', 'IBM Plex Sans', sans-serif;
}

/* ===================== RESPONSIVE ===================== */

/* Tablet: 768px–1280px */
@media (max-width: 1280px) {
  .hero-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .work-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .menu-toggle { display: flex; }

  /* Mobile nav overlay */
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 10, 0.97);
    padding: 80px 40px;
    gap: 24px;
    z-index: 99;
  }
  .nav-links.open a {
    font-size: 24px;
    text-transform: none;
    letter-spacing: 0;
  }

  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero-visual { display: none; }
  .hero-stats { gap: 24px; }

  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-meta {
    padding-left: 0;
    border-left: none;
    border-top: 1px solid var(--c-grid);
    padding-top: 24px;
    flex-direction: row;
    gap: 32px;
  }
  html[dir="rtl"] .about-meta {
    padding-right: 0;
    border-right: none;
  }

  .services-grid { grid-template-columns: 1fr; }

  .project-card { grid-template-columns: 1fr; }
  .project-img-wrap { aspect-ratio: 16/9; }

  .skills-grid { grid-template-columns: 1fr; }

  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .contact-social {
    padding-left: 0;
    border-left: none;
  }
  html[dir="rtl"] .contact-social {
    padding-right: 0;
    border-right: none;
  }

  .footer-grid {
    flex-direction: column;
    text-align: center;
  }
  .footer-links { flex-wrap: wrap; justify-content: center; }
}

@media (max-width: 480px) {
  .hero-stats { flex-direction: column; gap: 16px; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; justify-content: center; }
  .about-meta { flex-direction: column; gap: 16px; }
  .btn { padding: 12px 20px; font-size: 13px; }
}

/* ===================== A11Y & UX ENHANCEMENTS ===================== */
.skip-link {
  position: absolute;
  top: -52px;
  inset-inline-start: 12px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--c-accent);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  transition: top var(--transition);
}
.skip-link:focus { top: 12px; color: #fff; }

section[id] { scroll-margin-top: 76px; }

.nav-links a[aria-current="true"] { color: var(--c-accent-on-dark); }

.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.back-to-top {
  position: fixed;
  bottom: 24px;
  inset-inline-end: 24px;
  z-index: 90;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-accent);
  color: #fff;
  border-radius: var(--radius);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition);
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: #b92d20; color: #fff; }

/* ===================== HERO SKILL CHIPS ===================== */
.hero-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}
.hero-chip {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  padding: 7px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  color: var(--c-text-dim);
  background: var(--c-bg-alt);
  transition: all var(--transition);
}
.hero-chip:hover {
  color: var(--c-white);
  border-color: var(--c-accent-on-dark);
  background: var(--c-accent-dim);
}

/* ===================== HERO VIDEO ===================== */
.hero-video-frame {
  position: relative;
  width: 100%;
  max-width: 560px;
  aspect-ratio: 16 / 9;
  margin: 0 auto;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-bg-alt);
}
.hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.hero-video-cap {
  position: absolute;
  bottom: 0;
  inset-inline-start: 0;
  z-index: 2;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 12px;
  background: rgba(10, 10, 10, 0.85);
  color: var(--c-text-dim);
}

/* ===================== CREDENTIALS ===================== */
.about-creds {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--c-grid);
}
.about-creds h3 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-text-dim);
  margin-bottom: 20px;
}
.cred-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 0;
  border-bottom: 1px solid var(--c-grid);
}
.cred-item:last-child { border-bottom: none; }
.cred-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--c-white);
}
.cred-issuer {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--c-text-dim);
}

/* ===================== LATEST VIDEOS STRIP ===================== */
.latest-strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 220px;
  gap: 1px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  border: 1px solid var(--c-grid);
  background: var(--c-grid);
  margin-bottom: 48px;
  -webkit-overflow-scrolling: touch;
}
.latest-strip:empty { display: none; }
.latest-card {
  scroll-snap-align: start;
  background: var(--c-bg-alt);
  padding: 0 0 14px;
  display: block;
  transition: background var(--transition);
}
.latest-card:hover { background: var(--c-black); }
.latest-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}
.latest-title {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.45;
  padding: 10px 12px 0;
  color: var(--c-text);
}
.latest-meta {
  display: block;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--c-text-dim);
  padding: 4px 12px 0;
}

@media (max-width: 768px) {
  .latest-strip { grid-auto-columns: 180px; }
  .hero-video-frame { max-width: 100%; }
}

@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;
  }
}