/* ==========================================================================
   Yuukari_ne — personal site (v2)
   Vibrant glassmorphism over an interactive Three.js Saturn scene (bg.js).
   Content renders from content.json (edit via admin/ Decap CMS).

   MOTION SYSTEM — every animation is defined here:
   · tokens    : --dur-1/2/3 + --ease-out/--ease-spring set the tempo
   · reveal    : sections rise 28px + fade over --dur-3
   · stagger   : card grids cascade in, 60ms per card (--i from main.js)
   · hover     : cards lift 5px + border brightens over --dur-2, sheen sweeps
   · topbar    : nav pills slide their underline; CTA lifts with glow
   · avatar    : conic ring spins 14s; photo counter-spins; gentle 6s bob
   · fallbacks : all of the above collapse instantly under
                 prefers-reduced-motion
   ========================================================================== */

:root {
  --bg: #0b0d16;
  --panel: rgba(255, 255, 255, 0.045);
  --panel-strong: rgba(255, 255, 255, 0.08);
  --line: rgba(255, 255, 255, 0.1);
  --fg: #ffffff;
  --dim: #e2e8f0;
  --mute: #94a3b8;

  --violet: #8b5cf6;
  --pink: #ec4899;
  --cyan: #22d3ee;
  --amber: #f59e0b;
  --green: #4ade80;

  --grad: linear-gradient(100deg, var(--violet), var(--pink) 50%, var(--cyan));

  --disp: "Sora", "Be Vietnam Pro", system-ui, sans-serif;
  --sans: "Be Vietnam Pro", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, monospace;

  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4.5rem;

  --topbar-h: 64px;
  --page: 1080px;

  /* motion tokens */
  --dur-1: 160ms;
  --dur-2: 320ms;
  --dur-3: 640ms;
  --ease-out: cubic-bezier(0.33, 0.12, 0.16, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar-h) + var(--sp-5));
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip {
  position: fixed;
  top: -100px;
  left: var(--sp-4);
  z-index: 300;
  padding: var(--sp-2) var(--sp-4);
  font-size: 0.85rem;
  background: var(--fg);
  color: var(--bg);
  border-radius: 8px;
  transition: top var(--dur-2) var(--ease-out);
}
.skip:focus {
  top: var(--sp-4);
}

/* --- 3D background & CSS aurora ------------------------------------- */

#bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.aurora {
  position: fixed;
  inset: -20%;
  z-index: 0;
  pointer-events: none;
  filter: blur(90px);
  opacity: 0.55;
  background:
    radial-gradient(38% 42% at 22% 28%, rgba(139, 92, 246, 0.5), transparent 70%),
    radial-gradient(34% 38% at 78% 22%, rgba(34, 211, 238, 0.35), transparent 70%),
    radial-gradient(40% 44% at 62% 78%, rgba(236, 72, 153, 0.4), transparent 70%),
    radial-gradient(30% 34% at 15% 80%, rgba(245, 158, 11, 0.22), transparent 70%);
  animation: aurora-drift 26s ease-in-out infinite alternate;
}

@keyframes aurora-drift {
  0% {
    transform: translate3d(-3%, -2%, 0) rotate(0deg) scale(1);
  }
  50% {
    transform: translate3d(2%, 3%, 0) rotate(6deg) scale(1.08);
  }
  100% {
    transform: translate3d(-2%, 2%, 0) rotate(-4deg) scale(1.02);
  }
}

body:not(.no-webgl) .aurora {
  opacity: 0.26;
}

/* ==========================================================================
   TOPBAR
   ========================================================================== */

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  padding: 0 var(--sp-5);
  font-family: var(--disp);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 2px solid transparent;
  background: var(--grad) border-box;
  transition: transform var(--dur-2) var(--ease-spring);
}
.brand:hover .brand-avatar {
  transform: rotate(8deg) scale(1.1);
}

.brand-dot {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav {
  display: flex;
  gap: var(--sp-1);
  margin-inline: auto;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav::-webkit-scrollbar {
  display: none;
}

/* pill with a sliding gradient underline */
.nav-link {
  position: relative;
  padding: var(--sp-2) var(--sp-4);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dim);
  transition: color var(--dur-2) var(--ease-out), background var(--dur-2) var(--ease-out);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
  transform: translateX(-50%);
  transition: width var(--dur-2) var(--ease-out);
}

.nav-link:hover {
  color: var(--fg);
}

.nav-link.is-active {
  color: var(--fg);
  background: var(--panel-strong);
}
.nav-link.is-active::after,
.nav-link:hover::after {
  width: 60%;
}

.topbar-cta {
  flex-shrink: 0;
  padding: var(--sp-2) var(--sp-5);
  border: 0;
  cursor: pointer;
  font-family: var(--disp);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--bg);
  background: var(--grad);
  transition: transform var(--dur-2) var(--ease-spring), box-shadow var(--dur-2) var(--ease-out);
}

.topbar-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -8px rgba(139, 92, 246, 0.6);
}

@media (max-width: 760px) {
  .topbar {
    gap: var(--sp-3);
    padding-inline: var(--sp-4);
  }
  .brand-name {
    display: none;
  }
  .topbar-cta {
    margin-left: auto;
  }
  .nav {
    margin-inline: 0;
  }
}

/* ==========================================================================
   PAGE LAYOUT
   ========================================================================== */

.page {
  position: relative;
  z-index: 1;
  max-width: var(--page);
  margin-inline: auto;
  padding: var(--sp-7) var(--sp-4) var(--sp-8);
  display: flex;
  flex-direction: column;
  gap: var(--sp-8);
}

.noscript-note {
  padding: var(--sp-5);
  border-radius: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--dim);
}

.section {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.sec-head {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.sec-kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.sec-title {
  font: 700 clamp(1.6rem, 4.5vw, 2.2rem)/1.15 var(--disp);
  letter-spacing: -0.5px;
  position: relative;
  width: fit-content;
  margin-bottom: var(--sp-2); /* Extra breathing room below the gradient line */
}

/* gradient underline that draws in when the section reveals */
.sec-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  height: 3px;
  width: 100%;
  border-radius: 3px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 700ms var(--ease-out) 250ms;
}
.reveal.in .sec-title::after {
  transform: scaleX(1);
}

.sec-sub {
  color: var(--mute);
  font-size: 0.95rem;
  max-width: 60ch;
}

/* ==========================================================================
   HERO
   ========================================================================== */

.hero {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: var(--sp-6);
  align-items: center;
  padding: var(--sp-6);
  border-radius: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 30px 60px -35px rgba(0, 0, 0, 0.8);
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(120deg, rgba(139, 92, 246, 0.55), transparent 30%, transparent 65%, rgba(34, 211, 238, 0.45));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.hero-greeting {
  font-size: 1rem;
  color: var(--dim);
}

.hero-name {
  font: 800 clamp(2.4rem, 7vw, 4rem)/1.05 var(--disp);
  letter-spacing: -1.5px;
  background: linear-gradient(100deg, var(--fg) 30%, var(--violet) 60%, var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-alias {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--pink);
  margin-top: var(--sp-1);
}


.hero-tagline {
  color: var(--dim);
  margin-top: var(--sp-4);
  max-width: 48ch;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-4);
  margin-top: var(--sp-4);
  font-size: 0.85rem;
  color: var(--mute);
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-status {
  color: var(--green);
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  border-radius: 999px;
  font-family: var(--disp);
  font-weight: 700;
  font-size: 0.92rem;
  overflow: hidden;
  transition: transform var(--dur-2) var(--ease-spring), box-shadow var(--dur-2) var(--ease-out),
    background var(--dur-2) var(--ease-out), border-color var(--dur-2) var(--ease-out);
}

/* sheen sweep on hover */
.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 40%, rgba(255, 255, 255, 0.35) 50%, transparent 60%);
  transform: translateX(-120%);
  transition: transform 600ms var(--ease-out);
}
.btn:hover::after {
  transform: translateX(120%);
}
.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  color: var(--bg);
  background: var(--grad);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px -10px rgba(139, 92, 246, 0.65);
}

.btn-ghost {
  color: var(--fg);
  border: 1px solid var(--line);
  background: var(--panel);
}
.btn-ghost:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.3);
  background: var(--panel-strong);
}

.hero-side {
  display: flex;
  justify-content: center;
  position: relative;
}

.hero-avatar {
  width: min(240px, 60vw);
  aspect-ratio: 1;
  border-radius: 50%;
  padding: 6px;
  background: conic-gradient(from 210deg, var(--violet), var(--pink), var(--amber), var(--cyan), var(--violet));
  animation: avatar-spin 14s linear infinite, avatar-bob 6s ease-in-out infinite;
}
.hero-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 5px solid var(--bg);
  animation: avatar-spin 14s linear infinite reverse;
}

@keyframes avatar-spin {
  to {
    transform: rotate(360deg);
  }
}
@keyframes avatar-bob {
  50% {
    translate: 0 -10px;
  }
}

/* scroll hint under the hero */
.scroll-hint {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-top: var(--sp-5);
  color: var(--mute);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}
.scroll-hint i {
  display: block;
  width: 1px;
  height: 28px;
  background: linear-gradient(var(--dim), transparent);
  animation: hint-drop 1.8s var(--ease-out) infinite;
  transform-origin: top;
}
@keyframes hint-drop {
  0% {
    transform: scaleY(0);
  }
  45% {
    transform: scaleY(1);
  }
  100% {
    transform: scaleY(0);
    opacity: 0;
  }
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
    padding: var(--sp-5) var(--sp-4);
  }
  .hero-tagline,
  .hero-meta,
  .scroll-hint {
    justify-content: center;
  }
}

/* ==========================================================================
   ABOUT
   ========================================================================== */

.about-card {
  padding: var(--sp-6);
  border-radius: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.about-bio {
  color: var(--dim);
  font-size: 1.02rem;
  max-width: 68ch;
}

.chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-5);
}

.chip {
  padding: var(--sp-2) var(--sp-4);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--dim);
  background: var(--panel-strong);
  border: 1px solid var(--line);
  transition: transform var(--dur-2) var(--ease-spring), color var(--dur-2) var(--ease-out),
    border-color var(--dur-2) var(--ease-out);
}

.chip:hover {
  transform: translateY(-3px);
  color: var(--fg);
  border-color: rgba(139, 92, 246, 0.6);
}

/* ==========================================================================
   CARDS GRID
   ========================================================================== */

.cards {
  display: grid;
  gap: var(--sp-4);
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.glass {
  position: relative;
  border-radius: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  overflow: hidden;
  transition: transform var(--dur-2) var(--ease-out), border-color var(--dur-2) var(--ease-out),
    box-shadow var(--dur-2) var(--ease-out);
}

/* diagonal sheen that sweeps across on hover */
.glass::after {
  content: "";
  position: absolute;
  top: -60%;
  bottom: -60%;
  left: -30%;
  width: 36%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.07), transparent);
  transform: translateX(-160%) rotate(12deg);
  transition: transform 700ms var(--ease-out);
  pointer-events: none;
}
.glass:hover::after {
  transform: translateX(460%) rotate(12deg);
}

.glass:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow: 0 24px 48px -24px rgba(0, 0, 0, 0.85);
}

/* --- skill card ------------------------------------------------------ */

.skill {
  --el: var(--violet);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  padding: var(--sp-5);
}

a.skill:hover {
  box-shadow: 0 24px 48px -22px color-mix(in srgb, var(--el) 35%, transparent);
  border-color: color-mix(in srgb, var(--el) 55%, transparent);
}

.skill-top {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
}

.skill-name {
  font: 700 1.1rem var(--disp);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.skill-name::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--el);
  box-shadow: 0 0 14px var(--el);
  flex-shrink: 0;
}

.skill-note {
  color: var(--dim);
  font-size: 0.88rem;
  flex: 1;
}

/* --- vibe card ---------------------------------------------------------- */

.vibe-card {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  padding: var(--sp-5);
  text-align: center;
  align-items: center;
}

.vibe-icon {
  font-size: 1.8rem;
  line-height: 1;
}

.vibe-title {
  font: 700 1.05rem var(--disp);
}

.vibe-note {
  color: var(--dim);
  font-size: 0.88rem;
}

/* --- media card -------------------------------------------------------- */

.media {
  height: 200px;
}

.media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.68) saturate(0.9);
  transition: transform 500ms var(--ease-out), filter 500ms var(--ease-out);
}

.media:hover img {
  transform: scale(1.07);
  filter: brightness(0.95) saturate(1.05);
}

.media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(to top, rgba(11, 13, 22, 0.92) 12%, transparent 62%);
}

.media-idx {
  position: absolute;
  top: var(--sp-3);
  left: var(--sp-3);
  z-index: 2;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 1.5px;
  color: var(--fg);
  background: rgba(11, 13, 22, 0.55);
  border: 1px solid var(--line);
  padding: 2px 8px;
  border-radius: 999px;
}

.media-tag {
  position: absolute;
  top: var(--sp-3);
  right: var(--sp-3);
  z-index: 2;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--bg);
  background: var(--grad);
}

.media-title {
  position: absolute;
  left: var(--sp-4);
  bottom: var(--sp-3);
  z-index: 2;
  font: 600 0.98rem var(--disp);
}

/* --- link card ----------------------------------------------------------- */

.link-card {
  --el: var(--violet);
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-4) var(--sp-5);
}

.link-card:hover {
  border-color: color-mix(in srgb, var(--el) 60%, transparent);
  box-shadow: 0 20px 40px -22px color-mix(in srgb, var(--el) 40%, transparent);
}

.link-glyph {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  font: 700 0.8rem var(--disp);
  font-size: 1.1rem;
  letter-spacing: 0.5px;
  color: var(--el);
  background: color-mix(in srgb, var(--el) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--el) 40%, transparent);
  transition: transform var(--dur-2) var(--ease-spring);
}
.link-card:hover .link-glyph {
  transform: scale(1.1) rotate(-4deg);
}

.link-name {
  font: 600 1rem var(--disp);
  display: block;
}

.link-handle {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--mute);
  display: block;
}

.link-go {
  margin-left: auto;
  color: var(--mute);
  transition: color var(--dur-1) var(--ease-out), transform var(--dur-1) var(--ease-out);
}
.link-card:hover .link-go {
  color: var(--el);
  transform: translate(2px, -2px);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.foot {
  position: relative;
  z-index: 1;
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 var(--sp-4) var(--sp-7);
  text-align: center;
  color: var(--mute);
  font-size: 0.82rem;
}

.foot a {
  color: var(--dim);
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}
.foot a:hover {
  color: var(--fg);
}

/* ==========================================================================
   REVEAL + STAGGER (armed only when JS is present)
   ========================================================================== */

html.js .reveal,
html.js .cards > * {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out);
}
html.js .reveal.in,
html.js .cards.in > * {
  opacity: 1;
  transform: none;
}

/* cards cascade: main.js sets --i per card */
html.js .cards > * {
  transition-delay: calc(var(--i, 0) * 60ms);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  html.js .reveal,
  html.js .cards > * {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .aurora,
  .hero-avatar,
  .hero-avatar img,
  .scroll-hint i {
    animation: none;
  }
  * {
    transition-duration: 0.01ms !important;
  }
}