/* ============================================================
   SURUP RAJBHANDARI — Personal Website
   Shared stylesheet — used by all pages
   ============================================================ */


/* ============================================================
   1. DESIGN TOKENS
   ============================================================ */
:root {
  /* Backgrounds */
  --bg:             #0e0d0b;
  --surface:        #161412;
  --surface-raised: #1e1b17;

  /* Borders */
  --border:         rgba(255, 255, 255, 0.07);
  --border-warm:    rgba(201, 151, 58, 0.20);

  /* Text */
  --text-primary:   #f0ebe2;
  --text-secondary: #9e9485;
  --text-dim:       #524c44;

  /* Accent — used sparingly */
  --gold:           #c9973a;
  --gold-subtle:    rgba(201, 151, 58, 0.09);
  --gold-line:      rgba(201, 151, 58, 0.22);

  /* Typography */
  --font-display:   'Space Grotesk', 'Segoe UI', system-ui, sans-serif;
  --font-body:      'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono:      'Courier New', 'Courier', monospace;

  /* Layout */
  --max-width:      1100px;
  --px:             2rem;

  /* Radius */
  --r-sm:   6px;
  --r-md:   10px;
  --r-lg:   16px;
  --r-full: 999px;

  /* Transitions */
  --t: 0.18s ease;
}


/* ============================================================
   2. RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

img, video {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* Focus ring — visible on keyboard navigation */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}


/* ============================================================
   3. NAVIGATION
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(14, 13, 11, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

/* SR monogram */
.nav__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.nav__mark-ring {
  width: 34px;
  height: 34px;
  border: 1.5px solid var(--gold-line);
  border-radius: 50%;
  display: block;
  transition: border-color var(--t);
}

.nav__mark:hover .nav__mark-ring {
  border-color: var(--gold);
}

.nav__mark-text {
  position: absolute;
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

/* Nav links — desktop */
.nav__links {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.nav__links a {
  position: relative;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.45rem 0.8rem;
  border-radius: var(--r-sm);
  transition: color var(--t);
}

/* Active underline */
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: 0.1rem;
  left: 0.8rem;
  right: 0.8rem;
  height: 1.5px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t);
}

.nav__links a:hover {
  color: var(--text-primary);
}

.nav__links a.active,
.nav__links a[aria-current="page"] {
  color: var(--text-primary);
}

.nav__links a.active::after,
.nav__links a[aria-current="page"]::after {
  transform: scaleX(1);
}

/* Mobile hamburger toggle */
.nav__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  transition: border-color var(--t);
}

.nav__toggle:hover {
  border-color: var(--border-warm);
}

.nav__toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: transform var(--t), opacity var(--t);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }


/* ============================================================
   4. FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 1.75rem 2rem;
  margin-top: auto;
}

.footer__inner {
  max-width: var(--max-width);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer__copy {
  color: var(--text-dim);
  font-size: 0.8rem;
}

.footer__links {
  display: flex;
  gap: 1.25rem;
}

.footer__links a {
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  transition: color var(--t);
}

.footer__links a:hover {
  color: var(--text-primary);
}


/* ============================================================
   5. SHARED COMPONENTS
   ============================================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.7rem 1.2rem;
  border-radius: var(--r-md);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: all var(--t);
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background: var(--surface-raised);
  border-color: var(--border-warm);
  color: var(--text-primary);
}

.btn--primary:hover {
  border-color: var(--gold);
  background: rgba(201, 151, 58, 0.08);
}

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

.btn--ghost:hover {
  border-color: var(--border-warm);
  color: var(--text-primary);
}

/* Inline arrow link */
.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--t), gap var(--t);
}

.arrow-link:hover {
  color: var(--gold);
  gap: 0.5rem;
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.5rem;
}

.card--warm {
  border-color: var(--border-warm);
}

.card--interactive {
  transition: border-color var(--t), transform var(--t);
}

.card--interactive:hover {
  border-color: rgba(201, 151, 58, 0.35);
  transform: translateY(-2px);
}

/* Section label — small uppercase marker */
.section-label {
  display: block;
  color: var(--gold);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

/* Status indicators */
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--r-full);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.status::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status--progress {
  background: rgba(201, 151, 58, 0.10);
  border: 1px solid rgba(201, 151, 58, 0.18);
  color: var(--gold);
}
.status--progress::before { background: var(--gold); }

.status--completed {
  background: rgba(100, 175, 120, 0.10);
  border: 1px solid rgba(100, 175, 120, 0.18);
  color: #7dba8e;
}
.status--completed::before { background: #7dba8e; }

.status--archived {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.status--archived::before { background: var(--text-dim); }

/* Horizontal rule */
.rule {
  border: none;
  border-top: 1px solid var(--border);
  margin: 3.5rem 0;
}


/* ============================================================
   6. PAGE LAYOUT SHELL
   ============================================================ */
.page-main {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 0 var(--px) 6rem;
}

/* Compact hero for inner pages */
.page-hero {
  padding: 3.5rem 0 2.75rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3.5rem;
}

.page-hero__eyebrow {
  color: var(--gold);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.65rem;
}

.page-hero__title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.5vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.7rem;
}

.page-hero__sub {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 54ch;
  line-height: 1.7;
}


/* ============================================================
   7. HOME PAGE
   ============================================================ */
.home-hero {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 6rem var(--px) 5rem;
}

.home-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  margin-bottom: 1.5rem;
}

.home-hero__eyebrow::before {
  content: '';
  width: 20px;
  height: 1px;
  background: var(--gold);
  flex-shrink: 0;
}

.home-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5.5vw, 4.8rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.06;
  max-width: 15ch;
  margin-bottom: 1.5rem;
}

.home-hero__intro {
  color: var(--text-secondary);
  font-size: clamp(0.9375rem, 1.5vw, 1.0625rem);
  max-width: 52ch;
  line-height: 1.8;
  margin-bottom: 2.25rem;
}

.home-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Home teaser sections */
.home-sections {
  border-top: 1px solid var(--border);
}

.home-section {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 3rem var(--px);
  border-bottom: 1px solid var(--border);
}

/* Project teaser on home */
.project-teaser__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.project-teaser__title {
  font-family: var(--font-display);
  font-size: 1.175rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.project-teaser__desc {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.project-teaser__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Inline tech chips */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  padding: 0.2rem 0.55rem;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

/* Interest strip on home */
.interest-area {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 0.25rem;
}

.interest-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.interest-chip {
  padding: 0.4rem 0.85rem;
  border-radius: var(--r-full);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.875rem;
}


/* ============================================================
   8. ABOUT PAGE
   ============================================================ */
.about-layout {
  display: grid;
  grid-template-columns: 1fr minmax(220px, 300px);
  gap: 3.5rem;
  align-items: start;
  margin-bottom: 3.5rem;
}

/* Bio text */
.about-bio__para {
  color: var(--text-secondary);
  margin-bottom: 1.1rem;
  line-height: 1.8;
}

.about-bio__para:last-child {
  margin-bottom: 0;
}

/* Photo placeholder */
.photo-slot {
  aspect-ratio: 3 / 4;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 1.5rem;
}

/* ===================================================
   PHOTO REPLACEMENT INSTRUCTIONS
   When you have a profile photo:
   1. Copy your photo to: assets/photo.jpg (or .png, .webp)
   2. Replace the entire .photo-slot div with:
      <img src="../assets/photo.jpg"
           alt="Surup Rajbhandari"
           class="photo-image">
   3. The .photo-image class provides the styling below
   =================================================== */
.photo-image {
  width: 100%;
  border-radius: var(--r-lg);
  object-fit: cover;
  display: block;
}

.photo-slot__monogram {
  display: block;
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--border-warm);
  margin-bottom: 0.5rem;
}

.photo-slot__label {
  color: var(--text-dim);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Education block */
.education-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--gold-line);
  border-radius: var(--r-md);
  padding: 1.2rem 1.4rem;
  margin-top: 1.75rem;
}

.education-block__institution {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.education-block__degree {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0.15rem;
}

.education-block__meta {
  color: var(--text-dim);
  font-size: 0.8rem;
}

/* Learning strip */
.learning-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  margin-bottom: 3rem;
}

.learning-strip__label {
  color: var(--gold);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}

.learning-strip__items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.learning-strip__item {
  padding: 0.25rem 0.6rem;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.775rem;
}

/* Interest tiles */
.interests-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
  margin-bottom: 3.5rem;
}

.interest-tile {
  padding: 1.25rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}

.interest-tile__icon {
  font-size: 1.3rem;
  margin-bottom: 0.6rem;
}

.interest-tile__title {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.interest-tile__desc {
  color: var(--text-dim);
  font-size: 0.8rem;
  line-height: 1.6;
}

/* Connect section */
.about-connect {
  padding-top: 3rem;
  border-top: 1px solid var(--border);
}

.about-connect__heading {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.about-connect__sub {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
}

.connect-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}


/* ============================================================
   9. PROJECTS PAGE
   ============================================================ */
.projects-intro {
  color: var(--text-secondary);
  max-width: 58ch;
  margin-bottom: 2.5rem;
  line-height: 1.75;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

/* Project card */
.project-card {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: border-color var(--t), transform var(--t);
}

.project-card:hover {
  border-color: rgba(201, 151, 58, 0.3);
  transform: translateY(-2px);
}

.project-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.project-card__title {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.3;
}

.project-card__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.75;
  flex-grow: 1;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.28rem 0.6rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
  transition: all var(--t);
}

.project-card__link:hover {
  border-color: var(--border-warm);
  color: var(--text-primary);
}

.project-card__link--dim {
  opacity: 0.38;
  pointer-events: none;
  cursor: default;
}

/* Empty state */
.empty-notice {
  padding: 3rem 0;
  color: var(--text-secondary);
  max-width: 52ch;
  font-size: 0.9375rem;
  line-height: 1.75;
}


/* ============================================================
   10. CERTIFICATES PAGE
   ============================================================ */
.certs-intro {
  color: var(--text-secondary);
  max-width: 54ch;
  margin-bottom: 2.5rem;
  line-height: 1.75;
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.cert-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color var(--t), transform var(--t);
}

.cert-card:hover {
  border-color: rgba(201, 151, 58, 0.3);
  transform: translateY(-2px);
}

.cert-card__top {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.cert-seal {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1.5px solid var(--gold-line);
  background: var(--gold-subtle);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: var(--gold);
  font-size: 0.8rem;
}

.cert-card__title {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.cert-card__meta {
  color: var(--text-secondary);
  font-size: 0.825rem;
}

.cert-card__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.cert-badge {
  padding: 0.22rem 0.55rem;
  border-radius: var(--r-full);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.cert-badge--physical,
.cert-badge.physical {
  background: rgba(201, 151, 58, 0.10);
  border: 1px solid rgba(201, 151, 58, 0.18);
  color: var(--gold);
}

.cert-badge--digital,
.cert-badge.digital {
  background: rgba(100, 150, 210, 0.10);
  border: 1px solid rgba(100, 150, 210, 0.18);
  color: #7aabe0;
}

.cert-card__action {
  margin-top: auto;
}

.cert-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--t), gap var(--t);
}

.cert-card__link:hover {
  color: var(--gold);
  gap: 0.5rem;
}


/* ============================================================
   11. CONTACT PAGE
   ============================================================ */
.contact-intro {
  color: var(--text-secondary);
  max-width: 50ch;
  margin-bottom: 2.5rem;
  line-height: 1.75;
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1rem;
  max-width: 860px;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: border-color var(--t), transform var(--t);
}

.contact-link:hover {
  border-color: var(--border-warm);
  transform: translateY(-2px);
}

.contact-link__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: var(--gold-subtle);
  border: 1px solid var(--border-warm);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: var(--gold);
}

.contact-link__icon svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.contact-link__body {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.contact-link__label {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.1rem;
}

.contact-link__value {
  color: var(--text-secondary);
  font-size: 0.8rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.contact-note {
  margin-top: 2.5rem;
  max-width: 480px;
  padding: 1.1rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--gold-line);
  border-radius: var(--r-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.65;
}


/* ============================================================
   12. CERTIFICATE DETAIL PAGE (certs/sep.html)
   ============================================================ */
.cert-detail {
  max-width: 740px;
  margin-inline: auto;
  padding: 3.5rem var(--px) 5.5rem;
}

.cert-detail__back {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 2rem;
  transition: color var(--t), gap var(--t);
}

.cert-detail__back:hover {
  color: var(--text-primary);
  gap: 0.5rem;
}

.cert-detail__shell {
  background: var(--surface);
  border: 1px solid var(--border-warm);
  border-radius: var(--r-lg);
  padding: 1.75rem;
}

.cert-detail__header {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  margin-bottom: 0.3rem;
}

.cert-detail__title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 600;
  line-height: 1.15;
}

.cert-detail__meta {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.cert-detail__frame {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 0.85rem;
  margin-bottom: 1.5rem;
}

.cert-detail__frame iframe,
.cert-detail__frame img {
  width: 100%;
  display: block;
  border: 0;
  border-radius: var(--r-sm);
}

.cert-detail__frame iframe {
  height: 68vh;
  min-height: 400px;
}

.cert-detail__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.cert-detail__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}


/* ============================================================
   13. SCROLL REVEAL ANIMATION
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered reveal for grids */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 65ms; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 130ms; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 195ms; }

.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Page load fade-up */
@keyframes page-fade-up {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.page-enter {
  animation: page-fade-up 0.4s ease both;
}


/* ============================================================
   14. RESPONSIVE — TABLET (≤ 900px)
   ============================================================ */
@media (max-width: 900px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .photo-slot {
    max-width: 260px;
    aspect-ratio: 1 / 1;
  }
}


/* ============================================================
   15. RESPONSIVE — MOBILE (≤ 720px)
   ============================================================ */
@media (max-width: 720px) {
  :root {
    --px: 1.25rem;
  }

  /* Nav: show toggle, hide links by default */
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0.75rem 1.25rem 1rem;
    background: rgba(14, 13, 11, 0.97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    display: none;
  }

  .nav__links.open {
    display: flex;
  }

  .nav__links a {
    width: 100%;
    padding: 0.7rem 0.2rem;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
  }

  .nav__links a:last-child {
    border-bottom: none;
  }

  .nav__links a::after {
    display: none;
  }

  /* Home hero */
  .home-hero {
    padding: 4rem var(--px) 3.5rem;
  }

  /* Grids: single column */
  .projects-grid,
  .certs-grid,
  .contact-links {
    grid-template-columns: 1fr;
  }

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

  /* Footer */
  .footer__inner {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }

  .footer__links {
    justify-content: center;
  }

  /* Page hero */
  .page-hero {
    padding: 2.5rem 0 2rem;
    margin-bottom: 2.5rem;
  }

  .project-teaser__footer {
    flex-direction: column;
    align-items: flex-start;
  }
}


/* ============================================================
   16. RESPONSIVE — SMALL MOBILE (≤ 480px)
   ============================================================ */
@media (max-width: 480px) {
  .home-hero__actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .home-hero__actions .btn {
    width: 100%;
  }

  .connect-links {
    flex-direction: column;
  }

  .connect-links .btn {
    width: 100%;
    justify-content: center;
  }

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

  .cert-detail__actions {
    flex-direction: column;
  }

  .cert-detail__actions .btn {
    width: 100%;
  }
}


/* ============================================================
   17. REDUCED MOTION
   ============================================================ */
@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;
    transition: none;
  }

  .page-enter {
    animation: none;
  }
}