/* ============================================================
   JOANITA NAKITYO — PORTFOLIO
   styles.css
   Zero external frameworks. CSS custom properties throughout.
   Breakpoints: 480px | 768px | 1024px | 1280px
   ============================================================ */

/* ─── Custom properties ─────────────────────────────────── */
:root {
  /* Palette */
  --color-bg:          #f8f9fb;
  --color-surface:     #ffffff;
  --color-surface-alt: #f0f2f6;
  --color-border:      #dde1ea;
  --color-text:        #1a2236;
  --color-text-muted:  #4e5a72;
  --color-accent:      #1a6bbf;      /* teal-blue accent */
  --color-accent-dark: #144e8f;
  --color-accent-bg:   #e8f0fb;
  --color-navy:        #0d1b35;
  --color-notice-bg:   #f0f4ff;
  --color-notice-border: #c7d5f5;

  /* Typography */
  --font-sans: -apple-system, "Segoe UI", system-ui, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;

  --leading-tight:  1.2;
  --leading-normal: 1.65;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --max-width: 1100px;
  --nav-height: 64px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.06);

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 200ms;
}


/* ─── Reset & base ───────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

ul, ol {
  list-style: none;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Reduced motion: disable scroll-behavior and transitions */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}


/* ─── Skip navigation ────────────────────────────────────── */
.skip-nav {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  transition: top var(--duration) var(--ease);
}
.skip-nav:focus {
  top: 0;
  outline: 3px solid var(--color-navy);
  outline-offset: 2px;
}


/* ─── Layout helpers ─────────────────────────────────────── */
.container {
  width: min(var(--max-width), 100% - var(--space-8));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-20);
}

.section-alt {
  background-color: var(--color-surface-alt);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-navy);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-8);
  line-height: var(--leading-tight);
}

.section-lead {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  max-width: 60ch;
  margin-bottom: var(--space-10);
}


/* ─── Focus states ───────────────────────────────────────── */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}


/* ─── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.65em 1.4em;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--duration) var(--ease),
              color var(--duration) var(--ease),
              border-color var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
  white-space: nowrap;
}

.btn:hover { text-decoration: none; }

.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #fff;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn-outline:hover,
.btn-outline:focus-visible {
  background-color: var(--color-accent-bg);
  color: var(--color-accent-dark);
}

.btn-ghost {
  background-color: transparent;
  color: rgba(255,255,255,0.9);
  border-color: rgba(255,255,255,0.5);
}
.btn-ghost:hover,
.btn-ghost:focus-visible {
  background-color: rgba(255,255,255,0.15);
  color: #fff;
  border-color: #fff;
}

.btn-sm {
  font-size: var(--text-sm);
  padding: 0.45em 1em;
}


/* ─── Navigation ─────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
}

.nav-bar {
  height: var(--nav-height);
  background-color: rgba(13, 27, 53, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background-color var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
}

.nav-bar.scrolled {
  background-color: var(--color-navy);
  box-shadow: var(--shadow-md);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: min(var(--max-width), 100% - var(--space-8));
  margin-inline: auto;
}

.nav-logo img {
  display: block;
  width: 40px;
  height: 40px;
  object-fit: contain;
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  color: rgba(255,255,255,0.82);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  letter-spacing: 0.01em;
  transition: color var(--duration) var(--ease),
              background-color var(--duration) var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible {
  color: #fff;
  background-color: rgba(255,255,255,0.12);
  text-decoration: none;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}

.hamburger-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: rgba(255,255,255,0.88);
  border-radius: 2px;
  transition: transform var(--duration) var(--ease),
              opacity var(--duration) var(--ease);
}

/* Open state */
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}


/* ─── Hero ───────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background-image: url('../images/hero-image.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  padding-top: var(--nav-height);
}

/* dark overlay for contrast */
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(13, 27, 53, 0.82) 0%,
    rgba(26, 107, 191, 0.55) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  color: #fff;
  padding-block: var(--space-20);
}

/* Subtle grid texture overlay (systems motif — pure CSS, no image) */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.hero-eyebrow {
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-3);
}

.hero-name {
  font-size: clamp(var(--text-3xl), 6vw, var(--text-5xl));
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-3);
  color: #fff;
}

.hero-title {
  font-size: clamp(var(--text-lg), 2.5vw, var(--text-2xl));
  font-weight: 600;
  color: rgba(255,255,255,0.88);
  margin-bottom: var(--space-4);
  letter-spacing: 0.01em;
}

.hero-sub {
  font-size: var(--text-lg);
  color: rgba(255,255,255,0.75);
  max-width: 55ch;
  line-height: var(--leading-normal);
  margin-bottom: var(--space-8);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.hero-relocation {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.6);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}


/* ─── About ──────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-16);
  align-items: start;
}

.about-photo-wrap {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-8));
}

.about-photo {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: top center;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  /* subtle border motif */
  outline: 1px solid var(--color-border);
}

.about-text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
  max-width: 65ch;
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}


/* ─── Selected Work ──────────────────────────────────────── */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

/* Featured research card spans full width */
.project-card--featured {
  grid-column: 1 / -1;
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--duration) var(--ease),
              transform var(--duration) var(--ease);
}
.project-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* Featured card inner layout */
.project-card--featured {
  padding: var(--space-8);
  background: var(--color-navy);
  border-color: rgba(255,255,255,0.08);
  /* subtle grid motif */
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: center;
}

.project-card--featured .project-card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.project-card--featured .project-title {
  color: #fff;
  font-size: var(--text-2xl);
  font-weight: 700;
}

.project-card--featured .project-desc {
  color: rgba(255,255,255,0.75);
  max-width: 70ch;
}

.project-card--featured .tag {
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.85);
  border-color: rgba(255,255,255,0.2);
}

.project-status {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25em 0.75em;
  border-radius: var(--radius-full);
  background: rgba(26,107,191,0.3);
  color: rgba(255,255,255,0.9);
  border: 1px solid rgba(26,107,191,0.5);
  white-space: nowrap;
}

.project-notice {
  margin-top: var(--space-5);
  padding: var(--space-4);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.65);
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
}
.project-notice i {
  margin-top: 0.1em;
  flex-shrink: 0;
  color: rgba(255,255,255,0.45);
}

/* Standard card */
.project-card-img-wrap {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-surface-alt);
}
.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms var(--ease);
}
.project-card:hover .project-img {
  transform: scale(1.03);
}

.project-card-body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  flex: 1;
}

.project-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-navy);
  line-height: var(--leading-tight);
}

.project-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
  flex: 1;
}

/* Tags */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.25em 0.65em;
  border-radius: var(--radius-full);
  background: var(--color-accent-bg);
  color: var(--color-accent-dark);
  border: 1px solid var(--color-border);
  letter-spacing: 0.02em;
}

.work-more {
  margin-top: var(--space-10);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-base);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}
.work-more a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  color: var(--color-accent);
  transition: color var(--duration) var(--ease);
}
.work-more a:hover { color: var(--color-accent-dark); }


/* ─── Experience Timeline ────────────────────────────────── */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}

/* vertical rule */
.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--color-border);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-10);
}
.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--space-8) + 1px);
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.section-alt .timeline-marker {
  border-color: var(--color-surface-alt);
}

.timeline-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-1);
}

.timeline-role {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-navy);
}

.timeline-period {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.timeline-org {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
  letter-spacing: 0.01em;
}

.timeline-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.timeline-bullets li {
  position: relative;
  padding-left: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}
.timeline-bullets li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-border);
}


/* ─── Skills & Education ─────────────────────────────────── */
.skills-education-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

/* Skills */
.skill-groups {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.skill-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.skill-group-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
}

/* Education */
.education-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.education-item {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-5);
}

.education-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-1);
}

.education-degree {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-navy);
}

.education-period {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.education-school {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.education-note {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}


/* ─── Credentials ────────────────────────────────────────── */
.credential-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-5);
}

.credential-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--duration) var(--ease);
}
.credential-item:hover {
  box-shadow: var(--shadow-md);
}

.credential-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-bg);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  font-size: var(--text-lg);
}

.credential-body {
  flex: 1;
  min-width: 0;
}

.credential-name {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-navy);
  line-height: var(--leading-tight);
  margin-bottom: var(--space-1);
}

.credential-issuer {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}


/* ─── Contact ────────────────────────────────────────────── */
.contact-inner {
  max-width: 680px;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  text-decoration: none;
  transition: border-color var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease),
              transform var(--duration) var(--ease);
}
.contact-link:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  text-decoration: none;
  color: var(--color-text);
}

.contact-link-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-bg);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  font-size: var(--text-xl);
  transition: background-color var(--duration) var(--ease);
}
.contact-link:hover .contact-link-icon {
  background-color: var(--color-accent);
  color: #fff;
}

.contact-link-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.contact-link-text strong {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-navy);
}
.contact-link-text span {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}


/* ─── Footer ─────────────────────────────────────────────── */
.site-footer {
  background: var(--color-navy);
  color: rgba(255,255,255,0.7);
  padding-block: var(--space-10);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
  text-align: center;
}

.footer-name {
  font-size: var(--text-base);
  font-weight: 700;
  color: rgba(255,255,255,0.9);
  letter-spacing: 0.02em;
}

.footer-social {
  display: flex;
  gap: var(--space-5);
  align-items: center;
}

.footer-social a {
  color: rgba(255,255,255,0.6);
  font-size: var(--text-xl);
  transition: color var(--duration) var(--ease),
              transform var(--duration) var(--ease);
  display: flex;
  align-items: center;
}
.footer-social a:hover {
  color: #fff;
  transform: translateY(-2px);
  text-decoration: none;
}

.footer-copy {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
}


/* ─── Responsive — 1024px ────────────────────────────────── */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 240px 1fr;
    gap: var(--space-12);
  }

  .skills-education-grid {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
}


/* ─── Responsive — 768px ─────────────────────────────────── */
@media (max-width: 768px) {
  :root {
    --space-20: 4rem;
    --space-16: 3rem;
  }

  /* Nav */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background-color: var(--color-navy);
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: var(--space-3) var(--space-4);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-link {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .about-photo-wrap {
    position: static;
    max-width: 260px;
  }

  /* Hero */
  .hero {
    background-attachment: scroll;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-actions .btn {
    width: auto;
  }

  /* Projects */
  .project-card--featured {
    padding: var(--space-6);
  }

  .project-card--featured .project-title {
    font-size: var(--text-xl);
  }

  /* Skills / Education */
  .skills-education-grid {
    grid-template-columns: 1fr;
  }
}


/* ─── Responsive — 480px ─────────────────────────────────── */
@media (max-width: 480px) {
  :root {
    --space-20: 3rem;
  }

  .section-title {
    font-size: var(--text-2xl);
  }

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

  .credential-list {
    grid-template-columns: 1fr;
  }

  .contact-link {
    gap: var(--space-4);
    padding: var(--space-4);
  }

  .contact-link-text span {
    white-space: normal;
    font-size: 0.72rem;
  }
}

/* Active nav link (set by IntersectionObserver in main.js) */
.nav-link.active {
  color: #fff;
  background-color: rgba(255,255,255,0.14);
}