/* =========================================================
   BARA M. HAMMADEH — ACADEMIC RESEARCH SITE
   Notion-inspired stylesheet (v5)
   ---------------------------------------------------------
   Theme:  Clean, modern, Notion-aesthetic
   Palette: Off-white surfaces, charcoal ink, signature
            purple primary, pastel feature card tints,
            deep navy hero band.
   Type:   Inter (Notion-Sans equivalent) everywhere,
           JetBrains Mono for code/data labels.
   ---------------------------------------------------------
   Sections:
   1.  Tokens & Reset
   2.  Typography
   3.  Layout primitives
   4.  Header / Navigation
   5.  Hero
   6.  About — profile + bio
   7.  CV — accordion
   8.  Content TOC
   9.  Section heads
   10. Video cards
   11. PPTX panel
   12. Buttons
   13. Meta-analysis tool page
   14. Footer
   15. Scroll-reveal motion system
   16. Responsive
   ========================================================= */


/* ---------- 1. TOKENS & RESET ---------- */
:root {
  /* --- Notion colours --- */
  --color-primary:        #5645d4;   /* signature purple CTA */
  --color-primary-pressed:#4534b3;
  --color-primary-deep:   #3a2a99;
  --color-on-primary:     #ffffff;

  --color-brand-navy:     #0a1530;   /* hero band */
  --color-brand-navy-deep:#070f24;
  --color-brand-navy-mid: #1a2a52;

  --color-link:           #0075de;
  --color-link-pressed:   #005bab;

  /* Pastel feature tints */
  --tint-peach:    #ffe8d4;
  --tint-rose:     #fde0ec;
  --tint-mint:     #d9f3e1;
  --tint-lavender: #e6e0f5;
  --tint-sky:      #dcecfa;
  --tint-yellow:   #fef7d6;
  --tint-yellow-bold:#f9e79f;
  --tint-cream:    #f8f5e8;
  --tint-gray:     #f0eeec;

  /* Brand accent text colors (for tag chips) */
  --brand-purple-800: #391c57;
  --brand-orange-deep:#793400;
  --brand-green:      #1aae39;
  --brand-orange:     #dd5b00;
  --brand-pink:       #ff64c8;

  /* Surfaces */
  --color-canvas:       #ffffff;
  --color-surface:      #f6f5f4;
  --color-surface-soft: #fafaf9;

  /* Hairlines */
  --color-hairline:        #e5e3df;
  --color-hairline-soft:   #ede9e4;
  --color-hairline-strong: #c8c4be;

  /* Ink (text) */
  --color-ink-deep: #000000;
  --color-ink:      #1a1a1a;
  --color-charcoal: #37352f;
  --color-slate:    #5d5b54;
  --color-steel:    #787671;
  --color-stone:    #a4a097;
  --color-muted:    #bbb8b1;
  --color-on-dark:  #ffffff;
  --color-on-dark-muted:#a4a097;

  --color-success: #1aae39;
  --color-warning: #dd5b00;
  --color-error:   #e03131;

  /* Type families */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
               Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  /* Spacing scale (Notion tokens) */
  --space-xxs: 4px;
  --space-xs:  8px;
  --space-sm:  12px;
  --space-md:  16px;
  --space-lg:  20px;
  --space-xl:  24px;
  --space-xxl: 32px;
  --space-xxxl:40px;
  --space-section-sm: 48px;
  --space-section:    64px;
  --space-section-lg: 96px;
  --space-hero:       120px;

  /* Radii */
  --radius-xs:  4px;
  --radius-sm:  6px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-xxl: 20px;
  --radius-full:9999px;

  /* Shadows */
  --shadow-card: 0 1px 2px rgba(15, 15, 15, 0.04);
  --shadow-card-hover: 0 4px 12px rgba(15, 15, 15, 0.06);
  --shadow-mockup: 0 24px 48px -8px rgba(15, 15, 15, 0.20);
  --shadow-header: 0 1px 0 rgba(15, 15, 15, 0.05);

  /* Layout */
  --container-max: 1200px;
  --header-height: 64px;

  /* Motion */
  --easing: cubic-bezier(.4, 0, .2, 1);
  --duration-fast: 150ms;
  --duration: 200ms;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--color-charcoal);
  background: var(--color-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a  { color: inherit; text-decoration: none; }
button { font-family: inherit; }

::selection {
  background: var(--color-primary);
  color: var(--color-on-primary);
}


/* ---------- 2. TYPOGRAPHY ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--color-ink);
  margin: 0 0 var(--space-md);
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.5rem, 5.6vw, 5rem);     /* hero-display 80px */
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 600;
}

h2 {
  font-size: clamp(1.75rem, 3.6vw, 3rem);    /* heading-1/2 48–36px */
  line-height: 1.15;
  letter-spacing: -0.015em;
}

h3 {
  font-size: clamp(1.4rem, 2.4vw, 1.75rem);  /* heading-3 28px */
  line-height: 1.25;
}

h4 {
  font-size: 1.375rem;                       /* heading-4 22px */
  line-height: 1.30;
}

h5 { font-size: 1.125rem; line-height: 1.40; }

p { margin: 0 0 var(--space-md); }

p strong { font-weight: 600; color: var(--color-ink); }

.lead {
  font-size: 1.125rem;
  line-height: 1.50;
  color: var(--color-slate);
  font-weight: 400;
}

.eyebrow {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.0875em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  font-family: var(--font-sans);
}

.eyebrow.on-dark { color: var(--color-on-dark-muted); }

.accent { color: var(--color-primary); }

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-surface);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-xs);
  color: var(--color-charcoal);
}

pre {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.55;
  background: var(--color-charcoal);
  color: #f5f5f5;
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  overflow-x: auto;
  margin: 0 0 var(--space-md);
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
  border-radius: 0;
}


/* ---------- 3. LAYOUT PRIMITIVES ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--space-xl);
  padding-right: var(--space-xl);
}

.section {
  padding: var(--space-section) 0;
}

.section--lg { padding: var(--space-section-lg) 0; }
.section--sm { padding: var(--space-section-sm) 0; }

.section-title {
  margin-bottom: var(--space-xxl);
}
.section-title .num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--color-steel);
  margin-bottom: var(--space-sm);
}
.section-title h2 { margin: 0; }


/* ---------- 4. HEADER / NAVIGATION ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration) var(--easing),
              background var(--duration) var(--easing),
              box-shadow var(--duration) var(--easing);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--color-hairline);
  box-shadow: var(--shadow-header);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5em;
  font-weight: 600;
  color: var(--color-ink);
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.brand span {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--color-steel);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

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

.nav a {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-charcoal);
  transition: background var(--duration-fast) var(--easing),
              color var(--duration-fast) var(--easing);
}

.nav a:hover {
  background: var(--color-surface);
  color: var(--color-ink);
}

.nav a.active {
  color: var(--color-primary);
  background: var(--tint-lavender);
}

/* Mobile nav toggle (hamburger) */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-ink);
}

.nav-toggle:hover { background: var(--color-surface); }


/* ---------- 5. HERO ---------- */
.hero {
  position: relative;
  background: var(--color-brand-navy);
  color: var(--color-on-dark);
  padding: var(--space-section-lg) 0 var(--space-section-lg);
  overflow: hidden;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  opacity: 0.4;
  pointer-events: none;
}

/* Decorative sticky-note dots */
.hero::before {
  width: 120px;
  height: 120px;
  background:
    radial-gradient(circle at 20% 30%, var(--brand-orange) 14px, transparent 15px),
    radial-gradient(circle at 70% 60%, var(--brand-pink) 12px, transparent 13px),
    radial-gradient(circle at 40% 80%, var(--color-primary) 10px, transparent 11px);
  top: 8%;
  left: 6%;
  filter: blur(0);
  opacity: 0.85;
  background-color: transparent;
}

.hero::after {
  width: 140px;
  height: 140px;
  background:
    radial-gradient(circle at 30% 30%, var(--color-success) 14px, transparent 15px),
    radial-gradient(circle at 80% 70%, #f5d75e 12px, transparent 13px),
    radial-gradient(circle at 50% 50%, #2a9d99 10px, transparent 11px);
  bottom: 14%;
  right: 6%;
  filter: blur(0);
  opacity: 0.85;
  background-color: transparent;
}

.hero__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 920px;
}

.hero h1 {
  color: var(--color-on-dark);
  margin-bottom: var(--space-xl);
}

.hero h1 .accent {
  color: #c4baff;
}

.hero__lead {
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.78);
  margin: 0 auto var(--space-xl);
  max-width: 640px;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md) var(--space-xl);
  margin-top: var(--space-xl);
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.78);
}

.hero__meta span strong {
  color: var(--color-on-dark);
  font-weight: 600;
}

.hero__cta-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-xxl);
}


/* ---------- 6. ABOUT ---------- */
.about-split {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--space-xxxl);
  align-items: start;
}

/* Profile card */
.profile-card {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  position: sticky;
  top: calc(var(--header-height) + 24px);
  box-shadow: var(--shadow-card);
}

.profile-card__image {
  width: 100%;
  aspect-ratio: 1;
  background: var(--tint-lavender);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 3rem;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
}

.profile-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.profile-card__name {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-ink);
  margin: 0 0 var(--space-xxs);
}

.profile-card__role {
  font-size: 0.875rem;
  color: var(--color-steel);
  margin: 0 0 var(--space-lg);
}

.profile-card__contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  border-top: 1px solid var(--color-hairline);
  padding-top: var(--space-md);
}

.profile-card__contact li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  font-size: 0.8125rem;
}

.profile-card__contact li > span:first-child {
  color: var(--color-steel);
  font-weight: 500;
  flex-shrink: 0;
}

.profile-card__contact li a {
  color: var(--color-link);
  font-weight: 500;
  text-align: right;
}

.profile-card__contact li a:hover { text-decoration: underline; }
.profile-card__contact li > span:last-child:not(:first-child) {
  color: var(--color-charcoal);
  text-align: right;
}

/* Bio area */
.bio h2 { margin-top: var(--space-xs); }
.bio p {
  color: var(--color-slate);
  font-size: 1rem;
  line-height: 1.65;
}

/* Bio stat highlights -- pastel mini cards */
.bio__highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-xxl);
}

.stat {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xxs);
  transition: border-color var(--duration-fast) var(--easing),
              transform var(--duration-fast) var(--easing);
}

.stat:hover {
  border-color: var(--color-hairline-strong);
  transform: translateY(-1px);
}

.stat:nth-child(1) { background: var(--tint-lavender); border-color: transparent; }
.stat:nth-child(2) { background: var(--tint-peach);    border-color: transparent; }
.stat:nth-child(3) { background: var(--tint-mint);     border-color: transparent; }
.stat:nth-child(4) { background: var(--tint-sky);      border-color: transparent; }

.stat-num {
  font-size: 1.875rem;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: -0.02em;
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-charcoal);
  font-weight: 500;
  letter-spacing: 0.02em;
}


/* ---------- 7. CV ACCORDION ---------- */
.cv {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.cv-item {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--duration-fast) var(--easing),
              box-shadow var(--duration-fast) var(--easing);
}

.cv-item[open],
.cv-item:hover {
  border-color: var(--color-hairline-strong);
  box-shadow: var(--shadow-card);
}

.cv-item summary {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg) var(--space-xl);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.cv-item summary::-webkit-details-marker { display: none; }

.cv-item summary .label {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  flex: 1;
  min-width: 0;
}

.cv-item summary .num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-steel);
  font-weight: 500;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

.cv-item summary .title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-ink);
}

.cv-item summary .count {
  font-size: 0.75rem;
  color: var(--color-steel);
  font-family: var(--font-mono);
  background: var(--color-surface);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
}

.cv-item summary .icon {
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-steel);
  font-size: 1.1rem;
  font-weight: 400;
  transition: transform var(--duration) var(--easing),
              background var(--duration-fast) var(--easing);
  flex-shrink: 0;
}

.cv-item[open] summary .icon {
  transform: rotate(45deg);
  background: var(--color-surface);
  color: var(--color-ink);
}

.cv-item__body {
  padding: var(--space-md) var(--space-xl) var(--space-xl);
  border-top: 1px solid var(--color-hairline-soft);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.cv-entry {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.cv-entry .date {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-steel);
  letter-spacing: 0.02em;
  padding-top: 2px;
}

.cv-entry .content h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-ink);
  margin: 0 0 var(--space-xs);
}

.cv-entry .content p {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--color-slate);
  margin: 0 0 var(--space-xs);
}

.cv-entry .content p:last-child { margin-bottom: 0; }

.cv-entry .content .meta {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--color-steel);
  font-family: var(--font-mono);
  background: var(--color-surface);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  margin-top: var(--space-xxs);
}

.cv-entry .content a {
  color: var(--color-link);
  font-weight: 500;
}
.cv-entry .content a:hover { text-decoration: underline; }

.cv-tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
  margin-right: var(--space-xs);
}
.cv-tag--ongoing {
  background: var(--tint-yellow-bold);
  color: var(--brand-orange-deep);
}


/* ---------- 8. CONTENT TABLE OF CONTENTS ---------- */
.toc {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xxl);
  border: 1px solid var(--color-hairline);
}

.toc__title {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.0875em;
  color: var(--color-primary);
  margin: 0 0 var(--space-lg);
}

.toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xs);
}

.toc__list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-ink);
  transition: border-color var(--duration-fast) var(--easing),
              background var(--duration-fast) var(--easing),
              transform var(--duration-fast) var(--easing);
}

.toc__list a:hover {
  border-color: var(--color-primary);
  background: var(--tint-lavender);
  transform: translateX(2px);
}

.toc__list a .num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-steel);
  letter-spacing: 0.05em;
}

.toc__list a:hover .num { color: var(--color-primary); }


/* ---------- 9. CONTENT SECTION HEADS ---------- */
.content-section { padding-top: var(--space-section); padding-bottom: var(--space-section); }

.content-section__head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  margin-bottom: var(--space-xxl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-hairline);
}

.content-section__icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  background: var(--tint-lavender);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.content-section__icon svg { width: 26px; height: 26px; }

.content-section .text { flex: 1; min-width: 0; }

.content-section__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 0.075em;
  text-transform: uppercase;
  margin: 0 0 var(--space-xs);
}

.content-section__title {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  margin: 0 0 var(--space-xs);
  letter-spacing: -0.015em;
}

.content-section__desc {
  margin: 0;
  color: var(--color-slate);
  font-size: 1rem;
  max-width: 720px;
}

/* Per-section icon tints */
.content-section:nth-of-type(odd) .content-section__icon { background: var(--tint-lavender); color: var(--color-primary); }
#basics .content-section__icon       { background: var(--tint-lavender); color: var(--color-primary); }
#writing .content-section__icon      { background: var(--tint-peach);    color: var(--brand-orange-deep); }
#by-design .content-section__icon    { background: var(--tint-mint);     color: var(--brand-green); }
#designs .content-section__icon      { background: var(--tint-sky);      color: var(--color-link); }
#stats .content-section__icon        { background: var(--tint-rose);     color: #a02e6d; }
#publication .content-section__icon  { background: var(--tint-yellow);   color: var(--brand-orange-deep); }
#pptx .content-section__icon         { background: var(--tint-lavender); color: var(--color-primary); }
#format .content-section__icon       { background: var(--tint-mint);     color: var(--brand-green); }
#parameters .content-section__icon   { background: var(--tint-sky);      color: var(--color-link); }
#run .content-section__icon          { background: var(--tint-yellow-bold); color: var(--brand-orange-deep); }


/* ---------- 10. VIDEO CARDS ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.video-card {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color var(--duration-fast) var(--easing),
              transform var(--duration) var(--easing),
              box-shadow var(--duration) var(--easing);
}

.video-card:hover {
  border-color: var(--color-hairline-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.video-card__embed {
  aspect-ratio: 16 / 9;
  background: var(--color-surface);
  position: relative;
  overflow: hidden;
}

.video-card__embed.placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, transparent 49%, var(--color-hairline) 49%, var(--color-hairline) 51%, transparent 51%);
  background-size: 8px 8px;
  opacity: 0.6;
}

.video-card__embed.placeholder::after {
  content: "▶";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--color-stone);
}

.video-card__embed iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.video-card__body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  flex: 1;
}

.video-card__tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--tint-lavender);
  color: var(--brand-purple-800);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-xs);
}

#writing .video-card__tag,
.video-card__tag.is-orange   { background: var(--tint-peach); color: var(--brand-orange-deep); }
#by-design .video-card__tag,
.video-card__tag.is-green    { background: var(--tint-mint); color: var(--brand-green); }
#designs .video-card__tag,
.video-card__tag.is-sky      { background: var(--tint-sky); color: var(--color-link); }
#stats .video-card__tag,
.video-card__tag.is-rose     { background: var(--tint-rose); color: #a02e6d; }
#publication .video-card__tag,
.video-card__tag.is-yellow   { background: var(--tint-yellow); color: var(--brand-orange-deep); }

.video-card__title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 0;
  color: var(--color-ink);
  line-height: 1.30;
}

.video-card__desc {
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-slate);
  margin: 0;
  flex: 1;
}

.video-card__meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-steel);
  margin-top: var(--space-xs);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-hairline-soft);
}


/* ---------- 11. PPTX PANEL ---------- */
.pptx-section {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-xxl);
  border: 1px solid var(--color-hairline);
}

.pptx-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.pptx-item {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  gap: var(--space-md);
  transition: border-color var(--duration-fast) var(--easing),
              box-shadow var(--duration-fast) var(--easing);
}

.pptx-item:hover {
  border-color: var(--color-hairline-strong);
  box-shadow: var(--shadow-card-hover);
}

.pptx-item__icon {
  width: 44px;
  height: 44px;
  background: var(--tint-peach);
  color: var(--brand-orange-deep);
  border-radius: var(--radius-sm);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.pptx-item__body { flex: 1; min-width: 0; }

.pptx-item__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-ink);
  margin: 0 0 var(--space-xs);
}

.pptx-item__desc {
  font-size: 0.8125rem;
  color: var(--color-slate);
  margin: 0 0 var(--space-md);
  line-height: 1.50;
}

.pptx-item__actions {
  display: flex;
  gap: var(--space-xs);
}


/* ---------- 12. BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  height: 40px;
  padding: 0 var(--space-md);
  background: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0;
  cursor: pointer;
  transition: background var(--duration-fast) var(--easing),
              border-color var(--duration-fast) var(--easing),
              color var(--duration-fast) var(--easing),
              transform var(--duration-fast) var(--easing);
  text-decoration: none;
  white-space: nowrap;
  font-family: var(--font-sans);
}

.btn:hover {
  background: var(--color-surface);
  border-color: var(--color-charcoal);
}

.btn:active { transform: translateY(1px); }

.btn:disabled,
.btn[aria-disabled="true"] {
  background: var(--color-hairline);
  color: var(--color-muted);
  border-color: var(--color-hairline);
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-on-primary);
}

.btn--primary:hover {
  background: var(--color-primary-pressed);
  border-color: var(--color-primary-pressed);
  color: var(--color-on-primary);
}

.btn--dark {
  background: var(--color-ink-deep);
  border-color: var(--color-ink-deep);
  color: var(--color-on-dark);
}

.btn--dark:hover {
  background: var(--color-charcoal);
  border-color: var(--color-charcoal);
}

.btn--on-dark {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.4);
  color: var(--color-on-dark);
}

.btn--on-dark:hover {
  background: rgba(255, 255, 255, 0.10);
  border-color: rgba(255, 255, 255, 0.7);
}

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

.btn--ghost:hover { background: var(--color-surface); }

.btn--lg {
  height: 48px;
  padding: 0 var(--space-lg);
  font-size: 0.9375rem;
}

.btn--sm {
  height: 32px;
  padding: 0 var(--space-sm);
  font-size: 0.8125rem;
}


/* ---------- 13. META-ANALYSIS TOOL PAGE ---------- */
.tool-hero {
  background: var(--color-brand-navy);
  color: var(--color-on-dark);
  padding: var(--space-section-lg) 0 var(--space-section);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.tool-hero h1 {
  color: var(--color-on-dark);
  font-size: clamp(2rem, 4.5vw, 3.75rem);
  margin-bottom: var(--space-md);
}

.tool-hero p {
  color: rgba(255, 255, 255, 0.78);
  font-size: 1.125rem;
  max-width: 720px;
  margin: 0 auto var(--space-md);
}

.tool-hero .badges {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xl);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.10);
  color: var(--color-on-dark);
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.badge--purple { background: var(--color-primary); border-color: transparent; }

/* Steps grid (uses pastel feature cards) */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xxl);
}

.step-card {
  border-radius: var(--radius-lg);
  padding: var(--space-xxl);
  color: var(--color-charcoal);
}

.step-card .num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-canvas);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-ink);
  margin-bottom: var(--space-md);
}

.step-card h3 {
  font-size: 1.125rem;
  margin: 0 0 var(--space-xs);
  color: var(--color-ink);
}

.step-card p {
  font-size: 0.9375rem;
  margin: 0;
  color: var(--color-charcoal);
  line-height: 1.55;
  opacity: 0.85;
}

.step-card.is-peach    { background: var(--tint-peach); }
.step-card.is-mint     { background: var(--tint-mint); }
.step-card.is-lavender { background: var(--tint-lavender); }
.step-card.is-sky      { background: var(--tint-sky); }
.step-card.is-yellow   { background: var(--tint-yellow); }
.step-card.is-rose     { background: var(--tint-rose); }


/* Format guide */
.format-guide {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.format-card {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.format-card h4 {
  font-size: 0.9375rem;
  margin: 0 0 var(--space-xs);
  color: var(--color-ink);
}

.format-card .desc {
  font-size: 0.8125rem;
  color: var(--color-slate);
  margin: 0 0 var(--space-md);
}

.format-card .cols {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.format-card .cols li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-charcoal);
  background: var(--color-surface);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
}


/* Banner — yellow-bold */
.banner-yellow {
  background: var(--tint-yellow-bold);
  border-radius: var(--radius-lg);
  padding: var(--space-xxl);
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  margin-top: var(--space-xxl);
  color: var(--color-charcoal);
}

.banner-yellow .icon {
  width: 44px;
  height: 44px;
  background: var(--color-canvas);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--brand-orange-deep);
}

.banner-yellow .content h3 {
  font-size: 1.125rem;
  margin: 0 0 var(--space-xs);
}
.banner-yellow .content p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-charcoal);
}


/* Upload form */
.tool-form {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-xxl);
  margin-top: var(--space-xl);
  box-shadow: var(--shadow-card);
}

.dropzone {
  border: 2px dashed var(--color-hairline-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-xxxl);
  text-align: center;
  background: var(--color-surface-soft);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--easing),
              background var(--duration-fast) var(--easing);
}

.dropzone:hover,
.dropzone.is-dragover {
  border-color: var(--color-primary);
  background: var(--tint-lavender);
}

.dropzone.has-file {
  border-color: var(--color-success);
  border-style: solid;
  background: var(--tint-mint);
}

.dropzone .icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.dropzone p {
  font-size: 0.9375rem;
  color: var(--color-slate);
  margin: 0;
}

.dropzone strong { color: var(--color-ink); font-weight: 600; }

.dropzone .filename {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-ink);
  font-weight: 500;
  margin-top: var(--space-xs);
}

.dropzone input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

/* Parameter form fields */
.param-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

/* Output toggles — checkbox grid */
.output-toggles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
  margin-bottom: var(--space-xl);
}

.toggle {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-fast) var(--easing),
              border-color var(--duration-fast) var(--easing);
}
.toggle:hover {
  background: #faf9f7;
  border-color: var(--color-hairline-strong);
}
.toggle input[type="checkbox"] {
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--color-primary);
  cursor: pointer;
}
.toggle__body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.toggle__body strong {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-ink);
}
.toggle__hint {
  font-size: 0.75rem;
  color: var(--color-steel);
  line-height: 1.4;
}
/* When the checkbox is checked, give the card a soft purple wash. */
.toggle:has(input:checked) {
  background: #f5f3ff;
  border-color: #d6cffb;
}
.toggle:has(input:focus-visible) {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
/* Heavy outputs get a tinted card so users notice them */
.toggle--warn {
  background: #fdf6e8;
  border-color: #f0d690;
}
.toggle--warn:hover { background: #fbf0d4; border-color: #e6c66b; }
.toggle--warn:has(input:checked) {
  background: #fbeac0;
  border-color: #d4a832;
}

.field { display: flex; flex-direction: column; gap: var(--space-xs); }

.field label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-ink);
}

.field label .hint {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 400;
  color: var(--color-steel);
}

.field select,
.field input[type="text"],
.field input[type="number"] {
  width: 100%;
  height: 40px;
  padding: 0 var(--space-md);
  background: var(--color-canvas);
  color: var(--color-ink);
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-family: var(--font-sans);
  transition: border-color var(--duration-fast) var(--easing),
              box-shadow var(--duration-fast) var(--easing);
  appearance: none;
  -webkit-appearance: none;
}

.field select {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'><path d='M1 1.5L6 6.5L11 1.5' stroke='%23787671' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.field select:focus,
.field input:focus {
  outline: none;
  border-color: var(--color-primary);
  border-width: 2px;
  padding-left: calc(var(--space-md) - 1px);
}

.field .help {
  font-size: 0.6875rem;
  color: var(--color-steel);
  margin: 0;
}

.tool-form__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: center;
  margin-top: var(--space-xxl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-hairline);
}

/* Status / results pane */
.status {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  display: none;
  border: 1px solid transparent;
  line-height: 1.55;
}

.status.is-active { display: block; }
.status.is-info  { background: var(--tint-sky);    color: #003a73;  border-color: #b8d8f5; }
.status.is-ok    { background: var(--tint-mint);   color: #0d6b22; border-color: #a8e3b8; }
.status.is-warn  { background: var(--tint-yellow); color: #793400; border-color: #f1d877; }
.status.is-error { background: #ffe0e0;            color: #a01f1f; border-color: #f5b8b8; }

.status code {
  background: rgba(255,255,255,0.5);
}

.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid currentColor;
  border-right-color: transparent;
  animation: spin 0.8s linear infinite;
  margin-right: 8px;
  vertical-align: -2px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.results {
  display: none;
  margin-top: var(--space-xl);
}

.results.is-visible { display: block; }

.results h3 {
  margin: 0 0 var(--space-md);
  font-size: 1.25rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
}

.result-item {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  transition: border-color var(--duration-fast) var(--easing);
}

.result-item:hover { border-color: var(--color-primary); }

.result-item .ext {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--tint-lavender);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.result-item .ext.is-xlsx { background: var(--tint-mint); color: var(--brand-green); }
.result-item .ext.is-pdf  { background: var(--tint-rose); color: #a02e6d; }
.result-item .ext.is-zip  { background: var(--tint-yellow-bold); color: var(--brand-orange-deep); }

.result-item .meta {
  flex: 1;
  min-width: 0;
}
.result-item .meta strong {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.result-item .meta span {
  font-size: 0.75rem;
  color: var(--color-steel);
}

.result-item a.btn { flex-shrink: 0; }


/* ---------- 14. FOOTER ---------- */
.site-footer {
  background: var(--color-canvas);
  border-top: 1px solid var(--color-hairline);
  padding: var(--space-section) 0 var(--space-xxl);
  margin-top: var(--space-section-lg);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.8125rem;
  color: var(--color-steel);
}


/* ---------- 15. SCROLL-REVEAL ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 600ms var(--easing),
              transform 600ms var(--easing);
  will-change: opacity, transform;
}

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

.reveal-stagger { /* container */ }
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 480ms var(--easing),
              transform 480ms var(--easing);
}

.reveal-stagger.is-visible > * { opacity: 1; transform: none; }
.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 60ms; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 120ms; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 180ms; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 240ms; }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 300ms; }
.reveal-stagger.is-visible > *:nth-child(7) { transition-delay: 360ms; }
.reveal-stagger.is-visible > *:nth-child(8) { transition-delay: 420ms; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal, .reveal-stagger > * { opacity: 1; transform: none; }
}


/* ---------- 16. RESPONSIVE ---------- */
@media (max-width: 1023px) {
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0;
         flex-direction: column; align-items: stretch; gap: 0;
         background: var(--color-canvas); border-bottom: 1px solid var(--color-hairline);
         padding: var(--space-sm) var(--space-md);
         box-shadow: var(--shadow-card-hover); }
  .nav.is-open { display: flex; }
  .nav a { height: 44px; padding: 0 var(--space-md); border-radius: var(--radius-sm); }
  .nav-toggle { display: inline-flex; }

  .about-split { grid-template-columns: 1fr; gap: var(--space-xl); }
  .profile-card { position: static; max-width: 100%; }
}

@media (max-width: 767px) {
  :root { --space-section-lg: 64px; --space-section: 48px; --space-hero: 64px; }

  .container { padding-left: var(--space-md); padding-right: var(--space-md); }

  .hero { padding: var(--space-section-lg) 0; }
  .hero::before { width: 80px; height: 80px; top: 4%; left: 4%; }
  .hero::after { width: 90px; height: 90px; bottom: 6%; right: 4%; }

  .cv-entry { grid-template-columns: 1fr; gap: var(--space-xs); }
  .cv-entry .date { font-size: 0.75rem; }

  .content-section__head { flex-direction: column; gap: var(--space-md); }
  .content-section__icon { width: 48px; height: 48px; }
  .content-section__icon svg { width: 22px; height: 22px; }

  .toc { padding: var(--space-lg); }
  .toc__list { grid-template-columns: 1fr; }

  .pptx-section { padding: var(--space-lg); }
  .pptx-list { grid-template-columns: 1fr; }
  .pptx-item { flex-direction: column; }

  .tool-form { padding: var(--space-lg); }
  .dropzone { padding: var(--space-xl) var(--space-md); }

  .site-header__inner { position: relative; }

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

  .bio__highlights { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 479px) {
  h1 { font-size: 2.25rem; }
  .hero__meta { flex-direction: column; gap: var(--space-xs); }
  .bio__highlights { grid-template-columns: 1fr; }
  .tool-form__actions { flex-direction: column; align-items: stretch; }
  .tool-form__actions .btn { width: 100%; }
}