/* ========================================
   DESIGN SYSTEM — Ryan Chin Portfolio
   ======================================== */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ---------- Variables ---------- */
:root {
  /* palette */
  --bg-primary:    #0b0f1a;
  --bg-secondary:  #111827;
  --bg-card:       rgba(17, 24, 39, .55);
  --border-card:   rgba(255, 255, 255, .08);
  --text-primary:  #f1f5f9;
  --text-secondary:#94a3b8;
  --accent-cyan:   #22d3ee;
  --accent-purple: #a78bfa;
  --gradient-main: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));

  /* spacing */
  --section-py: 6rem;
  --container-max: 1120px;

  /* transitions */
  --ease-out: cubic-bezier(.22,1,.36,1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background: var(--bg-primary);
  color: var(--text-primary);
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: 'Outfit', sans-serif; line-height: 1.25; }

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
  width: 90%;
  max-width: var(--container-max);
  margin: 0 auto;
}

/* ---------- Gradient text utility ---------- */
.gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Section headings ---------- */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: .5rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 3rem;
}

section { padding: var(--section-py) 0; }

/* ---------- Glassmorphism card ---------- */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out), border-color .35s var(--ease-out);
}

.glass-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(34, 211, 238, .08);
  border-color: rgba(34, 211, 238, .18);
}

/* ========================================
   NAVIGATION
   ======================================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1rem 0;
  background: rgba(11, 15, 26, .8);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,.05);
  transition: padding .3s var(--ease-out), background .3s var(--ease-out);
}

.navbar.scrolled {
  padding: .6rem 0;
  background: rgba(11, 15, 26, .95);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.35rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: color .25s;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  border-radius: 2px;
  transition: width .3s var(--ease-out);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform .3s, opacity .3s;
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========================================
   HERO
   ======================================== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 5rem;
}

#hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
}

.hero-text { max-width: 600px; }

.hero-greeting {
  font-size: 1.15rem;
  color: var(--accent-cyan);
  font-weight: 500;
  margin-bottom: .25rem;
  letter-spacing: .5px;
}

.hero-name {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 800;
  margin-bottom: .3rem;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  min-height: 2.4rem;
}

.hero-tagline .cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background: var(--accent-cyan);
  margin-left: 3px;
  animation: blink .7s steps(1) infinite;
  vertical-align: text-bottom;
}

@keyframes blink { 50% { opacity: 0; } }

.hero-socials {
  display: flex;
  gap: 1rem;
  margin-top: .5rem;
}

.hero-socials a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  color: var(--text-secondary);
  font-size: 1.2rem;
  transition: color .3s, background .3s, transform .3s var(--ease-out);
}

.hero-socials a:hover {
  color: var(--accent-cyan);
  background: rgba(34,211,238,.08);
  transform: translateY(-3px);
}

.hero-photo {
  position: relative;
  width: 300px; height: 300px;
  flex-shrink: 0;
}

.hero-photo .photo-ring {
  width: 100%; height: 100%;
  border-radius: 50%;
  padding: 6px;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-photo .photo-inner {
  width: 100%; height: 100%;
  border-radius: 50%;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: var(--accent-cyan);
  overflow: hidden;
}

.hero-photo .photo-inner img {
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

/* hero glow blob */
.hero-glow {
  position: absolute;
  width: 500px; height: 500px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: .15;
  pointer-events: none;
}

.hero-glow.cyan  { background: var(--accent-cyan);  top: 10%; left: 5%; }
.hero-glow.purple { background: var(--accent-purple); bottom: 10%; right: 5%; }

/* ========================================
   ABOUT
   ======================================== */
#about .about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.about-bio {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.85;
}

.about-bio strong { color: var(--text-primary); }

.about-details { display: flex; flex-direction: column; gap: 1.25rem; }

.about-detail-card {
  padding: 1.25rem 1.5rem;
}

.about-detail-card h4 {
  font-size: .85rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent-cyan);
  margin-bottom: .35rem;
}

.about-detail-card p {
  color: var(--text-secondary);
  font-size: .95rem;
}

/* ========================================
   EXPERIENCE — Timeline
   ======================================== */
.timeline {
  position: relative;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple));
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.5rem;
  top: .55rem;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(34,211,238,.4);
}

.timeline-date {
  font-size: .85rem;
  color: var(--accent-purple);
  font-weight: 600;
  margin-bottom: .2rem;
}

.timeline-item h3 { font-size: 1.15rem; font-weight: 700; }

.timeline-item .timeline-org {
  color: var(--text-secondary);
  font-size: .95rem;
  margin-bottom: .4rem;
}

.timeline-item p {
  color: var(--text-secondary);
  font-size: .92rem;
}

/* ========================================
   PROJECTS
   ======================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
}

.project-card {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
}

.project-card .project-icon {
  font-size: 2rem;
  margin-bottom: .75rem;
}

.project-card h3 {
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: .5rem;
}

.project-card p {
  color: var(--text-secondary);
  font-size: .92rem;
  margin-bottom: 1rem;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.project-tags span {
  font-size: .75rem;
  font-weight: 600;
  padding: .3rem .75rem;
  border-radius: 999px;
  background: rgba(34,211,238,.08);
  color: var(--accent-cyan);
  border: 1px solid rgba(34,211,238,.15);
  transition: background .25s, color .25s;
}

.project-card:hover .project-tags span {
  background: rgba(34,211,238,.14);
}

/* ========================================
   SKILLS
   ======================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.75rem;
}

.skill-group {
  padding: 1.75rem;
}

.skill-group h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.skill-group h3 span.icon { font-size: 1.3rem; }

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.skill-tag {
  font-size: .82rem;
  font-weight: 500;
  padding: .35rem .85rem;
  border-radius: 8px;
  background: rgba(167,139,250,.07);
  color: var(--accent-purple);
  border: 1px solid rgba(167,139,250,.12);
  transition: transform .25s var(--ease-out), background .25s, box-shadow .25s;
}

.skill-tag:hover {
  transform: translateY(-2px);
  background: rgba(167,139,250,.14);
  box-shadow: 0 4px 16px rgba(167,139,250,.1);
}

/* ========================================
   AWARDS & CERTIFICATIONS
   ======================================== */
.awards-grid,
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.award-card,
.cert-card {
  padding: 1.5rem 1.75rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.award-card .award-icon,
.cert-card .cert-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.award-card h3,
.cert-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: .2rem;
}

.award-card p,
.cert-card p {
  color: var(--text-secondary);
  font-size: .88rem;
}

/* ========================================
   CONTACT
   ======================================== */
#contact {
  padding-bottom: 4rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.contact-card {
  padding: 1.5rem 1.75rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
}

.contact-card .contact-icon {
  font-size: 1.5rem;
  width: 48px; height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(34,211,238,.07);
  flex-shrink: 0;
}

.contact-card h4 {
  font-size: .85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: .15rem;
}

.contact-card p {
  font-size: .95rem;
  font-weight: 600;
}

/* ========================================
   FOOTER
   ======================================== */
footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid rgba(255,255,255,.05);
  color: var(--text-secondary);
  font-size: .85rem;
}

/* ========================================
   PARTICLE CANVAS
   ======================================== */
#particle-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: -1;
}

/* ========================================
   SCROLL REVEAL
   ======================================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
}

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

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
  :root { --section-py: 4rem; }

  .nav-links {
    position: fixed;
    top: 0; right: 0;
    width: 260px; height: 100vh;
    flex-direction: column;
    background: rgba(11,15,26,.97);
    backdrop-filter: blur(16px);
    padding: 5rem 2rem 2rem;
    gap: 1.5rem;
    transform: translateX(100%);
    transition: transform .35s var(--ease-out);
    border-left: 1px solid rgba(255,255,255,.06);
  }

  .nav-links.open { transform: translateX(0); }

  .hamburger { display: flex; }

  #hero .container {
    flex-direction: column-reverse;
    text-align: center;
  }

  .hero-socials { justify-content: center; }

  .hero-photo { width: 200px; height: 200px; }

  #about .about-grid { grid-template-columns: 1fr; }

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

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

  .awards-grid,
  .certs-grid { grid-template-columns: 1fr; }

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

@media (max-width: 480px) {
  .hero-name { font-size: 2rem; }
  .section-title { font-size: 1.6rem; }
}