/* ============================================================
   styles.css — Lin Jing Yang Portfolio
   Google Antigravity-inspired: floating, airy, clean
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:opsz,wght@14..32,300;14..32,400;14..32,500;14..32,600;14..32,700&display=swap');

/* ── Variables ── */
:root {
  --blue:   #4285F4;
  --green:  #34A853;
  --red:    #EA4335;
  --yellow: #FBBC05;
  --dark:   #202124;
  --gray:   #5F6368;
  --light:  #F8F9FA;
  --white:  #FFFFFF;
  --border: #E8EAED;
  --radius: 18px;
  --radius-sm: 10px;
  --shadow: 0 2px 10px rgba(32,33,36,0.10);
  --shadow-hover: 0 10px 40px rgba(32,33,36,0.14);
  --nav-h: 64px;
}

/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  color: var(--dark);
  background: var(--white);
  overflow-x: hidden;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ── Typography ── */
h1 { font-size: clamp(2rem, 5vw, 3.8rem); font-weight: 700; line-height: 1.12; letter-spacing: -0.025em; color: var(--dark); }
h2 { font-size: clamp(1.5rem, 3vw, 2.4rem); font-weight: 600; line-height: 1.2; letter-spacing: -0.015em; color: var(--dark); }
h3 { font-size: 1.2rem; font-weight: 600; line-height: 1.3; color: var(--dark); }
p  { color: var(--gray); line-height: 1.75; }

/* ── Layout ── */
.wrap    { max-width: 1100px; margin: 0 auto; padding: 0 36px; }
.section { padding: 96px 0; }

/* ── Navigation ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(255,255,255,0.90);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  z-index: 200;
}
.nav-i {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 36px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav-logo {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue) 0%, var(--green) 100%);
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: -0.5px;
  flex-shrink: 0;
  transition: transform 0.35s cubic-bezier(0.16,1,0.3,1), box-shadow 0.35s;
}
.nav-logo:hover {
  transform: translateY(-3px) scale(1.08);
  box-shadow: 0 6px 20px rgba(66,133,244,0.3);
}
.nav-links { display: flex; align-items: center; gap: 4px; flex: 1; }
.nav-links a {
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray);
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a.active { color: var(--dark); background: var(--light); }
.nav-cta {
  margin-left: auto;
  padding: 8px 20px;
  border-radius: 22px;
  background: var(--blue);
  color: #fff !important;
  font-size: 13px;
  font-weight: 600;
  transition: transform 0.3s cubic-bezier(0.16,1,0.3,1), box-shadow 0.3s;
  white-space: nowrap;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(66,133,244,0.35); }

/* ── Floating Orbs (background, all pages) ── */
.orbs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}
.orb {
  position: absolute;
  border-radius: 50%;
  opacity: 0.055;
  animation: orbDrift linear infinite;
}
@keyframes orbDrift {
  0%   { transform: translateY(0px)   rotate(0deg);  }
  25%  { transform: translateY(-28px) rotate(4deg);  }
  50%  { transform: translateY(-14px) rotate(-2deg); }
  75%  { transform: translateY(-22px) rotate(3deg);  }
  100% { transform: translateY(0px)   rotate(0deg);  }
}

/* ── Core Animations ── */
@keyframes floatUp {
  from { opacity: 0; transform: translateY(44px); }
  to   { opacity: 1; transform: translateY(0);    }
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}
@keyframes gentleFloat {
  0%, 100% { transform: translateY(0px);  }
  50%       { transform: translateY(-9px); }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 0.75s cubic-bezier(0.16,1,0.3,1),
              transform 0.75s cubic-bezier(0.16,1,0.3,1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Stagger helpers */
.reveal-d1 { transition-delay: 0.10s; }
.reveal-d2 { transition-delay: 0.20s; }
.reveal-d3 { transition-delay: 0.30s; }
.reveal-d4 { transition-delay: 0.40s; }
.reveal-d5 { transition-delay: 0.50s; }

/* ── Typing cursor ── */
.tw-cursor {
  display: inline-block;
  font-weight: 300;
  animation: blink 1.1s ease infinite;
  color: var(--blue);
  margin-left: 2px;
}

/* ── Section eyebrow ── */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 16px;
}
.eyebrow::before {
  content: '';
  width: 18px; height: 2px;
  background: var(--blue);
  display: block;
}

/* ── Page hero (inner pages) ── */
.page-hero {
  padding-top: calc(var(--nav-h) + 80px);
  padding-bottom: 56px;
}
.page-hero .lead {
  font-size: 1.1rem;
  color: var(--gray);
  max-width: 580px;
  line-height: 1.7;
  margin-top: 16px;
}

/* ── Cards ── */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  transition: transform 0.35s cubic-bezier(0.16,1,0.3,1),
              box-shadow 0.35s ease,
              border-color 0.2s;
}
.card:hover {
  transform: translateY(-7px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(66,133,244,0.2);
}

/* ── Category badges ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.badge-core     { background: rgba(66,133,244,0.10); color: #1a6be6; }
.badge-exposure { background: rgba(251,188,5,0.14);  color: #9a5f00; }
.badge-hobby    { background: rgba(52,168,83,0.10);  color: #1e7e34; }

/* ── Tags ── */
.tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  background: var(--light);
  color: var(--gray);
}

/* ── Timeline ── */
.timeline { position: relative; padding-left: 0; }
.timeline::before {
  content: '';
  position: absolute;
  left: 19px; top: 6px; bottom: 0;
  width: 2px;
  background: var(--border);
}
.tl-item {
  position: relative;
  padding-left: 54px;
  padding-bottom: 44px;
}
.tl-item:last-child { padding-bottom: 0; }
.tl-dot {
  position: absolute;
  left: 11px; top: 4px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--white);
  border: 2.5px solid var(--blue);
}
.tl-date {
  font-size: 11px;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  margin-bottom: 5px;
}
.tl-title  { font-size: 1.05rem; font-weight: 600; color: var(--dark); margin-bottom: 2px; }
.tl-org    { font-size: 0.875rem; color: var(--gray); margin-bottom: 10px; }
.tl-body   { font-size: 0.88rem; color: var(--gray); line-height: 1.7; }
.tl-body li { padding-left: 14px; position: relative; margin-bottom: 4px; }
.tl-body li::before { content: '–'; position: absolute; left: 0; color: var(--border); }

/* ── Grid helpers ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }

/* ── Divider ── */
.divider { border: none; border-top: 1px solid var(--border); margin: 64px 0; }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  font-size: 13px;
  color: var(--gray);
}
footer a { color: var(--blue); }
footer a:hover { text-decoration: underline; }

/* ── Hamburger button (hidden on desktop) ── */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  margin-left: auto;
  border-radius: 8px;
  transition: background 0.2s;
}
.nav-burger:hover { background: var(--light); }
.nav-burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--dark);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
/* Animate to X when open */
nav.nav-open .nav-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
nav.nav-open .nav-burger span:nth-child(2) { opacity: 0; }
nav.nav-open .nav-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .nav-burger { display: flex; }
  .nav-cta { display: none; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 10px 20px 18px;
    gap: 2px;
    z-index: 199;
  }
  nav.nav-open .nav-links { display: flex; }
  .nav-links a { padding: 11px 16px; border-radius: 10px; font-size: 15px; }
  .wrap { padding: 0 20px; }
  .section { padding: 64px 0; }
  .page-hero { padding-top: calc(var(--nav-h) + 48px); }
  .card { padding: 22px 24px; }
}
@media (max-width: 480px) {
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.45rem; }
}