/* ==========================================================================
   Abdulrahman Al-hilat — Portfolio
   Palette 1: Bench (Light, Physical, Grounded)
   Typography: IBM Plex Sans + Alexandria / Tajawal Arabic
   No rough/pixelated monospace. Clean, unified, highly legible sans-serif.
   ========================================================================== */

:root {
  --bg: #E8ECE9;           /* cool pale grey-green */
  --surface: #F5F7F5;      /* clean physical paper/plate */
  --ink: #1C2522;          /* deep charcoal green ink */
  --muted: #56635E;        /* legible secondary slate */
  --border: #C8D1CC;       /* architectural pencil line */
  --border-light: #DCE3DF; /* quiet division */
  --accent: #2E5B4E;       /* muted PCB solder mask green */
  --accent-light: #D5DFDC; /* calm stage highlight */
  --alert: #B4532A;        /* warm terracotta alert only */

  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-arabic: 'Alexandria', 'Tajawal', 'Readex Pro', 'IBM Plex Sans Arabic', sans-serif;

  --max-w: 1040px;
  --transition: 180ms ease;
}

/* Base reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  background-color: var(--bg);
  color: var(--ink);
}

/* Force all SVG text to inherit clean, smooth IBM Plex Sans */
svg text {
  font-family: var(--font-body) !important;
  letter-spacing: -0.01em;
}

/* Keyboard skip link */
.skip-link {
  position: absolute;
  top: -60px;
  left: 1.5rem;
  background: var(--ink);
  color: var(--surface);
  padding: 0.5rem 1rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  text-decoration: none;
  z-index: 1000;
  transition: top var(--transition);
}
.skip-link:focus {
  top: 1rem;
  outline: 2px solid var(--accent);
}

/* Container */
.wrap {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* Typography */
h1 {
  font-size: clamp(2rem, 3.8vw, 2.75rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
}

h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.7rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink);
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

p {
  color: var(--muted);
  max-width: 66ch;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition);
}
a:hover {
  color: var(--ink);
}

code, .mono {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.9em;
}

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

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  padding-block: 1.25rem;
  background: var(--bg);
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.brand-title {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--ink);
  text-decoration: none;
}

.arabic-name {
  font-family: var(--font-arabic);
  color: var(--muted);
  font-size: 0.95rem;
  margin-inline-start: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
}
.nav-links a:hover {
  color: var(--ink);
}

/* Hero */
.hero {
  padding-block: 4.5rem 3rem;
  border-bottom: 1px solid var(--border);
}

.hero-headline {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.hero-bio {
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--ink);
  margin-top: 1rem;
  margin-bottom: 2rem;
}

.hero-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-light);
}

.meta-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  display: block;
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.meta-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
}

/* The Spine: Sensor to Web/AI Chain */
.spine-section {
  padding-block: 3.5rem 2.5rem;
  border-bottom: 1px solid var(--border);
}

.section-lead {
  margin-top: 0.4rem;
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.spine-diagram {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.5rem 1rem;
}

.spine-svg {
  width: 100%;
  height: auto;
  display: block;
}

.spine-stage-node {
  cursor: pointer;
}
.spine-stage-node rect {
  transition: fill var(--transition), stroke var(--transition);
}
.spine-stage-node:hover rect {
  stroke: var(--accent);
}

/* ==========================================================================
   Projects Section (Clean List: Title + Small Summary -> Project Page)
   ========================================================================== */

.projects-section {
  padding-block: 3.5rem 4.5rem;
  border-bottom: 1px solid var(--border);
}

.projects-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.75rem 2rem;
  transition: border-color var(--transition), transform var(--transition);
  position: relative;
}

.project-card:hover {
  border-color: var(--accent);
}

.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.project-stage-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
}

.project-card-meta {
  font-size: 0.8rem;
  color: var(--muted);
}

.project-card-title {
  margin-bottom: 0.5rem;
}

.project-card-title a {
  color: var(--ink);
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
}

.project-card-title a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.project-card-summary {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
  max-width: 72ch;
}

.project-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-light);
}

.project-card-tags {
  font-size: 0.85rem;
  color: var(--muted);
}

.project-read-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.project-read-link:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* ==========================================================================
   Case Study Pages (Palette 1: Bench)
   ========================================================================== */

.breadcrumb-nav {
  padding-block: 1.25rem 0.5rem;
  font-size: 0.88rem;
}

.breadcrumb-nav a {
  color: var(--muted);
  text-decoration: none;
}

.breadcrumb-nav a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.case-hero {
  padding-block: 1.5rem 2.5rem;
  border-bottom: 1px solid var(--border);
}

.case-stage-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
}

.case-title {
  font-size: clamp(1.85rem, 3.4vw, 2.5rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 1rem;
}

.case-lead {
  font-size: 1.1rem;
  color: var(--muted);
  line-height: 1.6;
  max-width: 68ch;
  margin-bottom: 1.5rem;
}

.case-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-light);
}

.case-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.case-meta-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.case-meta-value {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink);
}

/* Case Body Layout */
.case-body-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 3rem;
  padding-block: 3rem 4rem;
  align-items: start;
}

@media (max-width: 860px) {
  .case-body-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

.case-article {
  min-width: 0;
}

.case-article h2 {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--ink);
  margin-block: 2.25rem 0.85rem;
}

.case-article h2:first-child {
  margin-top: 0;
}

.case-article h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink);
  margin-block: 1.75rem 0.65rem;
}

.case-article p {
  font-size: 1rem;
  color: var(--ink);
  line-height: 1.65;
  margin-bottom: 1.25rem;
  max-width: none;
}

.case-article ul {
  list-style: none;
  margin-bottom: 1.5rem;
}

.case-article li {
  position: relative;
  padding-left: 1.3rem;
  margin-bottom: 0.75rem;
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--ink);
}

[dir="rtl"] .case-article li {
  padding-left: 0;
  padding-right: 1.3rem;
}

.case-article li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent);
}

[dir="rtl"] .case-article li::before {
  left: auto;
  right: 0;
}

/* Schematic Box in Case Study */
.schematic-box {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.5rem;
  margin-block: 1.5rem 2rem;
}

.schematic-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.schematic-svg {
  width: 100%;
  height: auto;
  display: block;
}

/* Video Showcase Box */
.case-video-box {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.5rem;
  margin-block: 1.5rem 2rem;
}

.video-wrapper {
  position: relative;
  width: 100%;
  background: #0D1311;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.video-wrapper video {
  width: 100%;
  height: auto;
  display: block;
  outline: none;
}

/* Interactive Deck Preview Box */
.case-deck-box {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.5rem;
  margin-block: 1.5rem 2rem;
}

.deck-iframe-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #050507;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.deck-iframe-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 1280px;
  height: 720px;
  border: none;
  display: block;
  transform-origin: top left;
  transform: scale(var(--deck-scale, 0.55));
}

.deck-action-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-light);
}

.deck-action-hint {
  font-size: 0.88rem;
  color: var(--muted);
}

/* Technical Challenge Box */
.challenge-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
}

[dir="rtl"] .challenge-card {
  border-left: 1px solid var(--border);
  border-right: 3px solid var(--accent);
}

.challenge-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.4rem;
}

.challenge-card p {
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 0;
  line-height: 1.55;
}

/* Case Study Sidebar */
.case-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.case-sidebar-block {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
}

.case-sidebar-title {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 0.65rem;
}

.case-spec-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.spec-pill {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.25rem 0.55rem;
  font-size: 0.8rem;
  color: var(--ink);
  font-weight: 500;
}

.case-sidebar-fact {
  font-size: 0.95rem;
  color: var(--ink);
  line-height: 1.55;
}

.case-sidebar-fact strong {
  color: var(--accent);
  display: block;
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

/* Case Study Footer Nav */
.case-nav-footer {
  border-top: 1px solid var(--border);
  padding-block: 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

/* Understated Delights */
.oled-preview {
  background: #101614;
  color: #88C2B0;
  border: 1px solid #23302B;
  padding: 0.85rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 1.75rem;
}

.oled-preview-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}

.oled-alert-reading {
  color: var(--alert);
  font-weight: 600;
}

.csv-preview {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  white-space: pre-wrap;
  margin-bottom: 1.75rem;
  color: var(--ink);
}

/* Detail footer */
.detail-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.next-btn {
  background: transparent;
  border: none;
  color: var(--accent);
  font-family: var(--font-body);
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 500;
  padding: 0.4rem 0;
}
.next-btn:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* Plain action buttons */
.button-link {
  display: inline-block;
  background: var(--accent);
  color: var(--surface);
  padding: 0.55rem 1.15rem;
  font-size: 0.9rem;
  text-decoration: none;
  font-weight: 500;
  transition: background var(--transition);
}
.button-link:hover {
  background: var(--ink);
  color: var(--surface);
}

.button-link-secondary {
  display: inline-block;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--border);
  padding: 0.55rem 1.15rem;
  font-size: 0.9rem;
  text-decoration: none;
}
.button-link-secondary:hover {
  border-color: var(--ink);
}

/* Skills grouped by chain */
.skills-section {
  padding-block: 3.5rem 3rem;
  border-bottom: 1px solid var(--border);
}

.skills-chain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.skill-stage {
  border-top: 2px solid var(--border);
  padding-top: 1rem;
}

.skill-stage-header {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.35rem;
}

.skill-stage-title {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.skill-stage-items {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.6;
}

/* About & Certification */
.about-section {
  padding-block: 3.5rem 3rem;
  border-bottom: 1px solid var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 3rem;
  margin-top: 1.5rem;
}

@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.about-prose p {
  margin-bottom: 1rem;
  line-height: 1.65;
  color: var(--ink);
}

.side-panel {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 1.5rem;
}

.side-panel-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.side-panel h4 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.cert-meta {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

/* Contact */
.contact-section {
  padding-block: 3.5rem 4.5rem;
  border-top: 1px solid var(--border);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  margin-top: 1.5rem;
  align-items: start;
}

@media (max-width: 720px) {
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.contact-channels {
  list-style: none;
  border-top: 1px solid var(--border);
}

.contact-channel-row {
  display: flex;
  justify-content: space-between;
  padding-block: 0.85rem;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.95rem;
}

.contact-channel-label {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 2rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ==========================================================================
   Comprehensive Mobile & Phone Layout Improvements (<= 680px)
   ========================================================================== */

@media (max-width: 680px) {
  .wrap {
    padding-inline: 1.15rem;
  }

  /* Header Navigation */
  .site-header {
    padding-block: 1rem;
  }
  .header-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.65rem;
  }
  .nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1.15rem;
    font-size: 0.88rem;
  }

  /* Hero Section */
  .hero {
    padding-block: 2.75rem 2rem;
  }
  .hero-bio {
    font-size: 1.05rem;
    line-height: 1.55;
    margin-block: 0.75rem 1.5rem;
  }
  .hero-meta-grid {
    grid-template-columns: 1fr;
    gap: 1.15rem;
    padding-top: 1.25rem;
  }

  /* Spine Diagram */
  .spine-diagram {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 1rem 0.75rem;
  }
  .spine-svg {
    min-width: 560px;
  }

  /* Project Cards */
  .project-card {
    padding: 1.25rem 1.1rem;
  }
  .project-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
  .project-card-title a {
    font-size: 1.15rem;
  }
  .project-card-summary {
    font-size: 0.94rem;
    margin-bottom: 1rem;
  }
  .project-card-footer {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }
  .project-card-footer > div {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1.15rem !important;
  }

  /* Case Study Pages */
  .case-hero {
    padding-block: 2rem 1.5rem;
  }
  .case-title {
    font-size: 1.65rem;
  }
  .case-lead {
    font-size: 1rem;
    margin-bottom: 1.25rem;
  }
  .case-meta-bar {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    padding-top: 1rem;
  }

  .case-body-layout {
    padding-block: 2rem 3rem;
  }

  /* Video & Deck Showcase Boxes */
  .case-video-box,
  .case-deck-box,
  .schematic-box {
    padding: 1rem 0.75rem;
    margin-block: 1rem 1.5rem;
    overflow-x: auto;
  }

  .schematic-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    font-size: 0.72rem;
    padding-bottom: 0.5rem;
    margin-bottom: 0.75rem;
    line-height: 1.35;
  }

  .schematic-svg {
    min-width: 520px;
  }

  .deck-action-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    margin-top: 0.85rem;
    padding-top: 0.75rem;
  }

  .deck-action-bar .button-link {
    text-align: center;
    width: 100%;
    display: block;
    padding: 0.65rem 1rem;
  }

  .deck-action-hint {
    font-size: 0.84rem;
    line-height: 1.45;
  }

  /* Case Navigation Footer */
  .case-nav-footer {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding-block: 2rem;
  }
  .case-nav-footer a {
    text-align: center;
    width: 100%;
    display: block;
  }

  /* Contact Section */
  .contact-section {
    padding-block: 2.5rem 3rem;
  }
  .contact-channel-row {
    font-size: 0.88rem;
    padding-block: 0.75rem;
  }
}

@media (max-width: 440px) {
  .case-meta-bar {
    grid-template-columns: 1fr;
  }
  .button-link,
  .button-link-secondary {
    width: 100%;
    text-align: center;
    margin-bottom: 0.25rem;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}