/* =========================================================
   TABLE OF CONTENTS
   1. Custom properties (design tokens)
   2. Reset & base
   3. Utility classes
   4. Buttons
   5. Navigation
   6. Hero
   7. Section shell
   8. About
   9. Skills
   10. Projects + filter + modal
   11. Experience timeline
   12. Education
   13. Certifications
   14. Resume panel
   15. Contact
   16. Footer
   17. Scroll reveal animation
   18. Responsive
   19. Reduced motion / accessibility
   ========================================================= */

/* ---------- 1. CUSTOM PROPERTIES ---------- */
:root {
  /* Color: greyish-black premium base, blue + yellow accents */
  --bg: #18181A;
  --bg-alt: #1D1D20;
  --panel: #222225;
  --panel-2: #28282C;
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text: #ECEAE3;
  --text-dim: #9DA0A6;
  --text-faint: #717479;

  --violet: #4C7EF0;
  --violet-soft: #182338;
  --cyan: #F2C94C;
  --cyan-soft: #33290F;

  /* Type */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --max-width: 1200px;
  --section-pad-y: 130px;

  /* Motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.2s var(--ease);
  --transition-med: 0.4s var(--ease);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
ul { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.mono { font-family: var(--font-mono); }

/* Skip link for keyboard/screen-reader users */
.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  background: var(--violet);
  color: #0B0D12;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  z-index: 999;
  transition: top var(--transition-fast);
}
.skip-link:focus { top: 16px; }

/* Visible keyboard focus everywhere */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 3. UTILITIES ---------- */
.text-gradient {
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.text-accent { color: var(--cyan); }

.kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 12px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan);
  border: 1px solid var(--cyan-soft);
  background: var(--cyan-soft);
  padding: 7px 14px;
  border-radius: 30px;
  margin-bottom: 26px;
}
.eyebrow__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px var(--cyan-soft);
}

.tag-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.tag-list li {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 20px;
  white-space: nowrap;
}

.optional-flag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
  font-weight: 400;
}

/* ---------- 4. BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-size: 0.94rem;
  font-weight: 500;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}
.btn--primary {
  background: linear-gradient(90deg, var(--violet), #6558E0);
  color: #fff;
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px -10px rgba(76, 126, 240, 0.6); }

.btn--ghost {
  border: 1px solid var(--border-strong);
  color: var(--text);
}
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-2px); }

.btn--pill { padding: 9px 20px; border-radius: 30px; font-size: 0.85rem; border: 1px solid var(--border-strong); }
.btn--pill:hover { border-color: var(--violet); color: var(--violet); }

.btn--lg { padding: 16px 32px; font-size: 1rem; }

/* ---------- 5. NAVIGATION ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 13, 18, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 6vw;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav__logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
}
.nav__logo span { color: var(--violet); }

.nav__menu {
  display: flex;
  gap: 30px;
  flex: 1;
  justify-content: center;
}
.nav__link {
  font-size: 0.92rem;
  color: var(--text-dim);
  position: relative;
  transition: color var(--transition-fast);
}
.nav__link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 1.5px;
  background: var(--cyan);
  transition: width var(--transition-fast);
}
.nav__link:hover,
.nav__link.is-active { color: var(--text); }
.nav__link:hover::after,
.nav__link.is-active::after { width: 100%; }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}
.nav__toggle span {
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ---------- 6. HERO ---------- */
.hero {
  position: relative;
  padding: 100px 6vw 80px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 60px;
  align-items: center;
  min-height: 60vh;
}

.hero__title {
  font-size: clamp(2.4rem, 4.6vw, 3.8rem);
  margin-bottom: 22px;
}

.hero__intro {
  color: var(--text-dim);
  max-width: 54ch;
  font-size: 1.06rem;
  margin-bottom: 34px;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero__stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.hero__stat { display: flex; flex-direction: column; gap: 4px; }
.hero__stat-num {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--cyan);
}
.hero__stat-label {
  font-size: 0.8rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
}

.hero__visual {
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background:
    radial-gradient(circle at 30% 20%, var(--violet-soft), transparent 60%),
    radial-gradient(circle at 75% 75%, var(--cyan-soft), transparent 55%),
    var(--panel);
  background-image:
    radial-gradient(circle at 30% 20%, var(--violet-soft), transparent 60%),
    radial-gradient(circle at 75% 75%, var(--cyan-soft), transparent 55%),
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: auto, auto, 32px 32px, 32px 32px;
  overflow: hidden;
  position: relative;
}

.scroll-cue {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 1.5px solid var(--border-strong);
  border-radius: 20px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.scroll-cue span {
  width: 4px; height: 8px;
  background: var(--cyan);
  border-radius: 3px;
  animation: scrollCue 1.8s infinite;
}
@keyframes scrollCue {
  0% { opacity: 1; transform: translateY(0); }
  70% { opacity: 0; transform: translateY(14px); }
  100% { opacity: 0; }
}

/* ---------- 7. SECTION SHELL ---------- */
.section {
  padding: var(--section-pad-y) 6vw;
  max-width: var(--max-width);
  margin: 0 auto;
}
.section--alt {
  max-width: none;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section--alt > * { max-width: var(--max-width); margin-left: auto; margin-right: auto; }

.section__head { margin-bottom: 56px; max-width: 640px; }
.section__title { font-size: clamp(1.7rem, 3vw, 2.4rem); margin-bottom: 12px; }
.section__intro { color: var(--text-dim); }

/* ---------- 8. ABOUT ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: start;
}

.readout {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 8px 26px;
}
.readout__row {
  display: flex;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.readout__row:last-child { border-bottom: none; }
.readout__row span:first-child { color: var(--text-dim); }
.readout__row span:last-child { font-family: var(--font-mono); }

.about__content p { color: var(--text-dim); margin-bottom: 18px; }
.about__content strong { color: var(--text); }
.about__edit-note {
  font-size: 0.85rem;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  color: var(--text-faint);
}

/* ---------- 9. SKILLS ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.skill-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}
.skill-panel:hover { border-color: var(--violet); transform: translateY(-4px); }
.skill-panel__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--violet);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}
.skill-panel h3 { font-size: 1.02rem; }

/* ---------- 10. PROJECTS ---------- */
.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.filter-btn {
  padding: 9px 18px;
  border-radius: 30px;
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}
.filter-btn:hover { color: var(--text); }
.filter-btn.is-active {
  background: var(--violet);
  color: #fff;
  border-color: var(--violet);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.project-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-med), border-color var(--transition-fast);
}
.project-card:hover { transform: translateY(-6px); border-color: var(--border-strong); }

.project-card__image {
  aspect-ratio: 16 / 10;
  background: linear-gradient(140deg, var(--violet-soft), var(--cyan-soft));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  text-align: center;
  padding: 16px;
}

.project-card__body { padding: 22px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.project-card__category {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cyan);
}
.project-card__body h3 { font-size: 1.1rem; }
.project-card__body p { color: var(--text-dim); font-size: 0.9rem; flex: 1; }

.project-card__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
}
.project-card__links { display: flex; gap: 14px; }
.icon-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.icon-link:hover { color: var(--cyan); border-color: var(--cyan); }

.project-card__details-btn {
  font-size: 0.82rem;
  color: var(--violet);
  font-weight: 500;
}
.project-card__details-btn:hover { text-decoration: underline; }

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px;
}
.modal[hidden] { display: none; }

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(6, 7, 10, 0.75);
  backdrop-filter: blur(6px);
}

.modal__panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  max-width: 720px;
  width: 100%;
  max-height: 88vh;
  overflow-y: auto;
  z-index: 1;
  animation: modalIn 0.35s var(--ease);
}
@keyframes modalIn {
  from { opacity: 0; transform: translateY(20px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal__close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  font-size: 1.4rem;
  line-height: 1;
  display: flex; align-items: center; justify-content: center;
  z-index: 2;
}
.modal__close:hover { background: rgba(255,255,255,0.14); }

.modal__image {
  aspect-ratio: 16/8;
  background: linear-gradient(140deg, var(--violet-soft), var(--cyan-soft));
}

.modal__body { padding: 30px 32px 34px; }
.modal__category {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.modal__body h3 { font-size: 1.5rem; margin: 10px 0 14px; }
.modal__body > p { color: var(--text-dim); margin-bottom: 24px; }

.modal__meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 28px;
}
.modal__meta-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--text-faint);
  display: block;
  margin-bottom: 8px;
}
.modal__meta p { color: var(--text-dim); font-size: 0.92rem; }

.modal__actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 11. EXPERIENCE TIMELINE ---------- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 130px;
  top: 8px; bottom: 8px;
  width: 1px;
  background: var(--border-strong);
}
.timeline__item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 30px;
  padding: 24px 0;
}
.timeline__marker { position: relative; text-align: right; padding-right: 30px; }
.timeline__marker::after {
  content: '';
  position: absolute;
  right: -5px; top: 4px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}
.timeline__date { font-size: 0.8rem; color: var(--text-dim); }

.timeline__card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 26px;
  transition: border-color var(--transition-fast);
}
.timeline__card:hover { border-color: var(--border-strong); }
.timeline__type {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  color: var(--violet);
  background: var(--violet-soft);
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
}
.timeline__card h3 { font-size: 1.08rem; margin-bottom: 4px; }
.timeline__role { color: var(--text-faint); font-size: 0.85rem; margin-bottom: 10px; }
.timeline__card p:last-child { color: var(--text-dim); font-size: 0.92rem; }

/* ---------- 12. EDUCATION ---------- */
.edu-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  max-width: 760px;
}
.edu-card__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 16px;
}
.edu-card__school { color: var(--text-dim); font-size: 0.92rem; margin-top: 4px; }
.edu-card__dates { color: var(--cyan); font-size: 0.82rem; white-space: nowrap; }
.edu-card > p { color: var(--text-dim); }

/* ---------- 13. CERTIFICATIONS ---------- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.cert-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}
.cert-card:hover { transform: translateY(-4px); border-color: var(--violet); }
.cert-card h3 { font-size: 1rem; margin-bottom: 6px; }
.cert-card__issuer { color: var(--text-dim); font-size: 0.85rem; }
.cert-card__date {
  display: block;
  color: var(--text-faint);
  font-size: 0.76rem;
  margin: 10px 0 14px;
}
.cert-card__link { color: var(--cyan); font-size: 0.85rem; }
.cert-card__link:hover { text-decoration: underline; }

/* ---------- 14. RESUME PANEL ---------- */
.resume-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 46px;
}

/* ---------- 15. CONTACT ---------- */
.contact-panel {
  text-align: center;
  background: radial-gradient(circle at 50% 0%, var(--violet-soft), var(--panel) 65%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 64px 6vw;
}
.contact-panel .kicker { justify-content: center; }
.contact-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 30px;
}

/* ---------- 16. FOOTER ---------- */
.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 6vw;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 0.85rem;
}
.site-footer__socials { display: flex; gap: 20px; }
.site-footer__socials a:hover { color: var(--text); }

.back-to-top {
  width: 40px; height: 40px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}
.back-to-top:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-3px); }

/* ---------- 17. SCROLL REVEAL ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 18. RESPONSIVE ---------- */
@media (max-width: 980px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { order: -1; max-width: 420px; margin: 0 auto; }
  .about__grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .project-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .modal__meta { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  .nav__menu {
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: 10px 6vw 20px;
    transform: translateY(-110%);
    opacity: 0;
    transition: transform var(--transition-med), opacity var(--transition-med);
  }
  .nav__menu.is-open { transform: translateY(0); opacity: 1; }
  .nav__menu li { border-bottom: 1px solid var(--border); }
  .nav__menu .nav__link { display: block; padding: 14px 0; }
  .nav__toggle { display: flex; }
  .nav__resume { display: none; }

  .timeline::before { left: 8px; }
  .timeline__item { grid-template-columns: 1fr; gap: 10px; }
  .timeline__marker { text-align: left; padding-left: 26px; padding-right: 0; }
  .timeline__marker::after { left: 3px; right: auto; }
}

@media (max-width: 640px) {
  .skills-grid { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr; }
  .hero__stats { gap: 24px; }
  .resume-panel { flex-direction: column; text-align: center; }
  section, .section { padding-left: 6vw; padding-right: 6vw; }
  :root { --section-pad-y: 90px; }
}

/* ---------- 19. REDUCED MOTION ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-cue span { animation: none; }
  .btn--primary:hover,
  .btn--ghost:hover,
  .skill-panel:hover,
  .project-card:hover,
  .cert-card:hover,
  .back-to-top:hover { transform: none; }
}