/* ==========================================================================
   components.css — every UI component in the site
   Ordered roughly by appearance: chrome → hero → content sections → footer →
   overlays → motion primitives.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--text);
  --btn-border: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-block-size: 2.875rem;          /* ≥44px touch target (WCAG 2.2 AA) */
  padding-inline: var(--space-5);
  padding-block: var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  white-space: nowrap;
  color: var(--btn-fg);
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring),
              background-color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn[disabled] { opacity: 0.55; pointer-events: none; }

.btn-primary {
  --btn-bg: var(--accent);
  --btn-fg: var(--accent-contrast);
  box-shadow: var(--shadow-accent);
}
.btn-primary:hover { --btn-bg: var(--accent-hover); color: var(--accent-contrast); }

.btn-secondary {
  --btn-bg: var(--surface);
  --btn-border: var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover {
  --btn-border: var(--accent-border);
  --btn-bg: var(--accent-subtle);
  color: var(--text);
}

.btn-ghost { --btn-fg: var(--text-secondary); padding-inline: var(--space-4); }
.btn-ghost:hover { --btn-fg: var(--text); --btn-bg: var(--bg-inset); }

/* Circular icon-only control (social links, theme toggle, back-to-top). */
.btn-icon {
  display: inline-grid;
  place-items: center;
  inline-size: 2.75rem;
  block-size: 2.75rem;
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring),
              color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              background-color var(--duration-fast) var(--ease-out);
}
.btn-icon:hover {
  transform: translateY(-2px);
  color: var(--accent-text);
  border-color: var(--accent-border);
  background: var(--accent-subtle);
}
.btn-icon .icon { inline-size: 1.125rem; block-size: 1.125rem; }

/* --------------------------------------------------------------------------
   Icons
   Inline SVG sprite — replaces the Bootstrap Icons webfont (100KB CSS +
   132KB woff2) with ~4KB of markup, no extra request, no FOUT, and glyphs
   that scale/recolour with currentColor.
   -------------------------------------------------------------------------- */
.icon {
  inline-size: 1.25em;
  block-size: 1.25em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: none;
}
.icon-solid { fill: currentColor; stroke: none; }

/* --------------------------------------------------------------------------
   Site header
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 100;
  block-size: var(--header-height);
  display: flex;
  align-items: center;
  border-block-end: 1px solid transparent;
  transition: background-color var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out),
              backdrop-filter var(--duration-base) var(--ease-out);
}
.site-header.is-stuck {
  background: var(--surface-overlay);
  backdrop-filter: blur(14px) saturate(180%);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  border-block-end-color: var(--border);
}

.site-header > .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  font-size: var(--text-base);
}
.brand-mark {
  display: grid;
  place-items: center;
  inline-size: 2.25rem;
  block-size: 2.25rem;
  border-radius: var(--radius-md);
  background: var(--accent);
  color: var(--accent-contrast);
  font-size: var(--text-sm);
  font-weight: var(--weight-black);
  letter-spacing: 0;
  box-shadow: var(--shadow-accent);
}
.brand-name { white-space: nowrap; }

.nav-list { display: flex; align-items: center; gap: var(--space-1); }

.nav-link {
  position: relative;
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out);
}
.nav-link::after {
  content: "";
  position: absolute;
  inset-block-end: 0.25rem;
  inset-inline-start: var(--space-3);
  inline-size: calc(100% - var(--space-3) * 2);
  block-size: 2px;
  border-radius: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--duration-base) var(--ease-out);
}
.nav-link:hover { color: var(--text); }
.nav-link:hover::after,
.nav-link[aria-current="true"]::after { transform: scaleX(1); }
.nav-link[aria-current="true"] { color: var(--text); font-weight: var(--weight-semibold); }

.header-actions { display: flex; align-items: center; gap: var(--space-2); }

.lang-toggle {
  min-block-size: 2.75rem;
  padding-inline: var(--space-4);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
  transition: color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              background-color var(--duration-fast) var(--ease-out);
}
.lang-toggle:hover {
  color: var(--accent-text);
  border-color: var(--accent-border);
  background: var(--accent-subtle);
}

/* Theme toggle swaps which glyph is visible rather than rewriting classes
   from JS — keeps the icon state purely declarative off [data-theme]. */
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }

.nav-toggle { display: none; }

/* --- Mobile navigation ---------------------------------------------------- */
@media (max-width: 63.999rem) {
  .nav-toggle { display: inline-grid; }

  .site-nav {
    position: fixed;
    inset-block: var(--header-height) 0;
    inset-inline-end: 0;
    inline-size: min(20rem, 82vw);
    padding: var(--space-6) var(--space-5);
    background: var(--surface);
    border-inline-start: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transition: transform var(--duration-base) var(--ease-out),
                visibility var(--duration-base);
  }

  /* The closed and open states are written as mutually exclusive selectors
     (:not([data-open="true"]) vs [data-open="true"]) rather than a base rule
     plus an override. The override form ties on specificity with the
     [dir="rtl"] flip — 0,2,0 each — leaving correctness dependent on source
     order, which is exactly the kind of thing that silently breaks when rules
     get moved. Mutually exclusive selectors simply cannot conflict.
     Transforms don't respond to logical properties, so RTL needs its own
     off-canvas direction. */
  .site-nav:not([data-open="true"]) {
    transform: translateX(100%);
    visibility: hidden;
  }
  [dir="rtl"] .site-nav:not([data-open="true"]) {
    transform: translateX(-100%);
  }
  .site-nav[data-open="true"] {
    transform: none;
    visibility: visible;
  }

  .nav-list { flex-direction: column; align-items: stretch; gap: var(--space-1); }
  .nav-link { padding: var(--space-4); font-size: var(--text-base); }
  .nav-link::after { display: none; }
  .nav-link[aria-current="true"] { background: var(--accent-subtle); color: var(--accent-text); }

  .nav-scrim {
    position: fixed;
    inset: 0;
    z-index: 99;
    background: rgba(4, 5, 10, 0.5);
    backdrop-filter: blur(2px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-base) var(--ease-out), visibility var(--duration-base);
  }
  .nav-scrim[data-open="true"] { opacity: 1; visibility: visible; }
}

@media (min-width: 64rem) {
  .nav-scrim { display: none; }
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: calc(var(--header-height) + clamp(3rem, 8vw, 6rem)) var(--section-gap);
  overflow: hidden;
  isolation: isolate;
}

/* Layered decorative background: a faint blueprint grid, two soft colour
   washes, and a mask that fades the whole thing out toward the bottom.
   All pointer-events:none and aria-hidden — purely atmospheric. */
.hero-backdrop {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}
.hero-backdrop::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 4rem 4rem;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  will-change: transform;
}
.hero-glow-1 {
  inline-size: min(38rem, 90vw);
  block-size: min(38rem, 90vw);
  inset-block-start: -14rem;
  inset-inline-start: -10rem;
  background: var(--hero-glow-1);
  animation: drift-a 22s var(--ease-in-out) infinite alternate;
}
.hero-glow-2 {
  inline-size: min(30rem, 80vw);
  block-size: min(30rem, 80vw);
  inset-block-start: -6rem;
  inset-inline-end: -8rem;
  background: var(--hero-glow-2);
  animation: drift-b 26s var(--ease-in-out) infinite alternate;
}
@keyframes drift-a {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(4rem, 3rem, 0) scale(1.12); }
}
@keyframes drift-b {
  from { transform: translate3d(0, 0, 0) scale(1.08); }
  to   { transform: translate3d(-3rem, 4rem, 0) scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-glow { animation: none; }
}

.hero-grid {
  display: grid;
  gap: clamp(var(--space-7), 5vw, var(--space-10));
  align-items: center;
}
@media (min-width: 62rem) {
  .hero-grid { grid-template-columns: 1.15fr 0.85fr; }
}

.hero-availability {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  color: var(--accent-text);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-pill);
  align-self: start;
}
.status-dot {
  inline-size: 0.5rem;
  block-size: 0.5rem;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--success) 70%, transparent);
  animation: pulse-dot 2.4s var(--ease-out) infinite;
}
@keyframes pulse-dot {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--success) 70%, transparent); }
  70%  { box-shadow: 0 0 0 0.5rem color-mix(in srgb, var(--success) 0%, transparent); }
  100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--success) 0%, transparent); }
}
@media (prefers-reduced-motion: reduce) { .status-dot { animation: none; } }

.hero-title { margin-block: var(--space-5) var(--space-4); }
.hero-title .accent { color: var(--accent-text); }

.hero-lede {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  max-inline-size: 40ch;
}

.hero-actions { margin-block-start: var(--space-7); }
.hero-social { margin-block-start: var(--space-7); }

/* Terminal-style visual — a code artefact instead of a stock illustration.
   Reads as "engineer" far more than a generic hero image would. */
.hero-panel {
  position: relative;
  border-radius: var(--radius-xl);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.hero-panel-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-inset);
  border-block-end: 1px solid var(--border);
}
.hero-panel-dot { inline-size: 0.6875rem; block-size: 0.6875rem; border-radius: 50%; background: var(--border-strong); }
.hero-panel-title {
  margin-inline-start: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}
.hero-code {
  margin: 0;
  padding: var(--space-5);
  font-family: var(--font-mono);
  font-size: clamp(0.75rem, 0.68rem + 0.32vw, 0.875rem);
  line-height: 1.85;
  color: var(--text-secondary);
  overflow-x: auto;
  direction: ltr;              /* code is always LTR, even in Arabic */
  text-align: start;
  tab-size: 2;
}
.hero-code .tok-key { color: var(--accent-text); }
.hero-code .tok-str { color: var(--success); }
.hero-code .tok-cls { color: var(--text); font-weight: var(--weight-semibold); }
.hero-code .tok-com { color: var(--text-muted); font-style: italic; }

.scroll-cue {
  display: grid;
  place-items: center;
  inline-size: 2.5rem;
  block-size: 2.5rem;
  margin-inline: auto;
  margin-block-start: var(--space-9);
  color: var(--text-muted);
  border-radius: 50%;
  animation: nudge 2.2s var(--ease-in-out) infinite;
}
.scroll-cue:hover { color: var(--accent-text); }
@keyframes nudge {
  0%, 100% { transform: translateY(0); opacity: 0.7; }
  50%      { transform: translateY(0.4rem); opacity: 1; }
}
@media (prefers-reduced-motion: reduce) { .scroll-cue { animation: none; } }

/* --------------------------------------------------------------------------
   Section headers
   -------------------------------------------------------------------------- */
.section-head { margin-block-end: clamp(var(--space-7), 4vw, var(--space-9)); }
.section-head-center { text-align: center; margin-inline: auto; max-inline-size: 44rem; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--accent-text);
}
.eyebrow::before {
  content: "";
  inline-size: 1.5rem;
  block-size: 1px;
  background: currentColor;
}
.section-head-center .eyebrow::before { display: none; }

:lang(ar) .eyebrow { letter-spacing: var(--tracking-normal); text-transform: none; }

.section-title { margin-block: var(--space-4) var(--space-4); }
.section-lede {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-inline-size: 52ch;
  line-height: var(--leading-relaxed);
}
.section-head-center .section-lede { margin-inline: auto; }

/* --------------------------------------------------------------------------
   Card
   -------------------------------------------------------------------------- */
.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out);
}
.card-pad { padding: clamp(var(--space-5), 3vw, var(--space-6)); }
.card-interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

/* --------------------------------------------------------------------------
   About — stat strip + fact list
   -------------------------------------------------------------------------- */
.stat-row { --col-min: 8rem; --grid-gap: var(--space-4); margin-block-start: var(--space-7); }
.stat { text-align: start; }
.stat-value {
  font-size: var(--text-2xl);
  font-weight: var(--weight-black);
  letter-spacing: var(--tracking-tight);
  color: var(--accent-text);
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--text-muted);
  letter-spacing: var(--tracking-wide);
}

.fact-list { display: grid; gap: var(--space-5); }
.fact { display: flex; align-items: flex-start; gap: var(--space-4); }
.fact-icon {
  display: grid;
  place-items: center;
  inline-size: 2.75rem;
  block-size: 2.75rem;
  flex: none;
  border-radius: var(--radius-md);
  color: var(--accent-text);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
}
.fact-label { font-size: var(--text-xs); color: var(--text-muted); letter-spacing: var(--tracking-wide); }
.fact-value { font-weight: var(--weight-semibold); word-break: break-word; }
a.fact-value { color: var(--text); }
a.fact-value:hover { color: var(--accent-text); }

/* --------------------------------------------------------------------------
   Skills
   -------------------------------------------------------------------------- */
.skill-group { --grid-gap: var(--space-5); --col-min: 15rem; }

.skill-group-title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  color: var(--text);
  margin-block-end: var(--space-5);
}
.skill-group-title .icon { color: var(--accent-text); }

.skill + .skill { margin-block-start: var(--space-4); }
.skill-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
  margin-block-end: var(--space-2);
  font-size: var(--text-sm);
}
.skill-name { font-weight: var(--weight-medium); }
.skill-level { font-size: var(--text-xs); color: var(--text-muted); font-variant-numeric: tabular-nums; }

.skill-track {
  block-size: 0.375rem;
  border-radius: var(--radius-pill);
  background: var(--bg-inset);
  overflow: hidden;
}
.skill-bar {
  block-size: 100%;
  inline-size: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent) 55%, var(--success)));
  transform-origin: inline-start;
  transition: inline-size var(--duration-slower) var(--ease-out);
}

/* --------------------------------------------------------------------------
   Projects
   -------------------------------------------------------------------------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin-block-end: var(--space-7);
}
.chip {
  min-block-size: 2.375rem;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              background-color var(--duration-fast) var(--ease-out);
}
.chip:hover { color: var(--text); border-color: var(--accent-border); }
.chip[aria-pressed="true"] {
  color: var(--accent-contrast);
  background: var(--accent);
  border-color: var(--accent);
}

.project-grid { --col-min: 20rem; --grid-gap: var(--space-5); }

.project-card { display: flex; flex-direction: column; overflow: hidden; block-size: 100%; }

.project-media {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--bg-inset);
  overflow: hidden;
}
.project-media img {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}
.project-card:hover .project-media img { transform: scale(1.04); }

.project-status {
  position: absolute;
  inset-block-start: var(--space-3);
  inset-inline-end: var(--space-3);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--text);
  background: var(--surface-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
}
.project-status .status-dot { animation: none; }
.project-status[data-status="1"] .status-dot { background: var(--success); }
.project-status[data-status="2"] .status-dot { background: var(--accent); }
.project-status[data-status="3"] .status-dot { background: var(--text-muted); }

.project-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: var(--space-3);
  padding: var(--space-5);
}
.project-title { font-size: var(--text-lg); }
.project-desc { font-size: var(--text-sm); color: var(--text-secondary); flex: 1; }

.tag-list { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.tag {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.project-links { display: flex; gap: var(--space-2); margin-block-start: var(--space-2); }
.project-links .btn { flex: 1; padding-inline: var(--space-3); font-size: var(--text-xs); }

/* --------------------------------------------------------------------------
   Timeline (experience / education)
   -------------------------------------------------------------------------- */
.timeline { position: relative; padding-inline-start: var(--space-7); }
.timeline::before {
  content: "";
  position: absolute;
  inset-inline-start: 0.3125rem;
  inset-block: 0.5rem;
  inline-size: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--border) 65%, transparent);
}

.timeline-item { position: relative; padding-block-end: var(--space-7); }
.timeline-item:last-child { padding-block-end: 0; }

.timeline-marker {
  position: absolute;
  inset-inline-start: calc(var(--space-7) * -1);
  inset-block-start: 0.3125rem;
  inline-size: 0.75rem;
  block-size: 0.75rem;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.timeline-item[data-current="true"] .timeline-marker {
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-subtle);
}

.timeline-period {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  color: var(--accent-text);
  margin-block-end: var(--space-2);
}
.timeline-title { font-size: var(--text-lg); }
.timeline-org { font-size: var(--text-sm); color: var(--text-secondary); margin-block: var(--space-1) var(--space-3); }
.timeline-desc { font-size: var(--text-sm); color: var(--text-secondary); }

/* --------------------------------------------------------------------------
   Certificates
   -------------------------------------------------------------------------- */
.cert-grid { --col-min: 17rem; }
.cert { display: flex; gap: var(--space-4); align-items: flex-start; block-size: 100%; }
.cert-icon {
  display: grid;
  place-items: center;
  inline-size: 2.75rem;
  block-size: 2.75rem;
  flex: none;
  border-radius: var(--radius-md);
  color: var(--accent-text);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
}
.cert-name { font-size: var(--text-base); font-weight: var(--weight-semibold); }
.cert-issuer { font-size: var(--text-sm); color: var(--text-secondary); }
.cert-date { font-size: var(--text-xs); color: var(--text-muted); margin-block-start: var(--space-1); }
.cert-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-block-start: var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
}

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */
.field { display: grid; gap: var(--space-2); }
.field-label { font-size: var(--text-sm); font-weight: var(--weight-medium); }
.field-label .req { color: var(--danger); margin-inline-start: 0.15em; }

.input {
  inline-size: 100%;
  min-block-size: 2.875rem;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--text);
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out),
              background-color var(--duration-fast) var(--ease-out);
}
.input::placeholder { color: var(--text-muted); }
.input:focus {
  outline: none;
  background: var(--surface);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}
.input[aria-invalid="true"] { border-color: var(--danger); }
textarea.input { min-block-size: 8rem; resize: vertical; line-height: var(--leading-normal); }

.field-error {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--danger);
}
.field-error[hidden] { display: none; }

.form-foot { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; }

.spinner {
  inline-size: 1.125rem;
  block-size: 1.125rem;
  border: 2px solid color-mix(in srgb, currentColor 25%, transparent);
  border-block-start-color: currentColor;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  padding-block: var(--space-8);
  background: var(--bg-subtle);
  border-block-start: 1px solid var(--border);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.footer-note { font-size: var(--text-xs); color: var(--text-muted); }
.footer-social { display: flex; gap: var(--space-2); }

/* --------------------------------------------------------------------------
   Back to top
   -------------------------------------------------------------------------- */
.to-top {
  position: fixed;
  inset-block-end: var(--space-5);
  inset-inline-end: var(--space-5);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transform: translateY(0.75rem);
  transition: opacity var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out),
              visibility var(--duration-base);
}
.to-top[data-visible="true"] { opacity: 1; visibility: visible; transform: translateY(0); }

/* --------------------------------------------------------------------------
   Toast
   -------------------------------------------------------------------------- */
.toast-region {
  position: fixed;
  inset-block-end: var(--space-5);
  inset-inline-start: var(--space-5);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-inline-size: min(24rem, calc(100vw - var(--space-8)));
}
.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text);
  background: var(--surface-raised);
  border: 1px solid var(--border-strong);
  border-inline-start: 3px solid var(--toast-accent, var(--accent));
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: toast-in var(--duration-base) var(--ease-out);
}
.toast[data-tone="success"] { --toast-accent: var(--success); }
.toast[data-tone="error"] { --toast-accent: var(--danger); }
.toast .icon { color: var(--toast-accent); margin-block-start: 0.1em; }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(0.75rem) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.toast.is-leaving { opacity: 0; transform: translateY(0.5rem); transition: opacity var(--duration-fast), transform var(--duration-fast); }

/* --------------------------------------------------------------------------
   Empty / error states
   -------------------------------------------------------------------------- */
.state {
  display: grid;
  place-items: center;
  gap: var(--space-3);
  padding: var(--space-9) var(--space-5);
  text-align: center;
  color: var(--text-muted);
  grid-column: 1 / -1;
}
.state .icon { inline-size: 2rem; block-size: 2rem; opacity: 0.6; }

/* Skeleton placeholder shown while a section's data is in flight. */
.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--bg-inset);
  border-radius: var(--radius-lg);
}
.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--text) 6%, transparent), transparent);
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer { to { transform: translateX(100%); } }
@media (prefers-reduced-motion: reduce) { .skeleton::after { animation: none; } }

/* --------------------------------------------------------------------------
   Scroll reveal — strictly progressive enhancement.

   The hidden start state is gated behind html.reveal-ready, which reveal.js
   only adds once it has confirmed IntersectionObserver support AND armed a
   failsafe timer. Without that class, content is simply visible. This matters:
   if the reveal machinery ever fails to run (JS error, no IO support, a
   non-rendering/background tab that never fires callbacks), the page must
   still show its content rather than a screen of opacity:0 elements.
   -------------------------------------------------------------------------- */
.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
.reveal-ready [data-reveal="fade"] { transform: none; }
.reveal-ready [data-reveal="left"] { transform: translateX(-1.5rem); }
.reveal-ready [data-reveal="right"] { transform: translateX(1.5rem); }
.reveal-ready [data-reveal="scale"] { transform: scale(0.96); }

.reveal-ready [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  will-change: auto;
}