/* ==========================================================================
   Albert Wang — personal site
   Pastel blue / Mt. Fuji theme. Edit tokens in :root to re-theme.
   ========================================================================== */

:root {
  /* color */
  --bg: #EEF4FB;
  --bg-tint: #E3EBF9;
  --surface: #FFFFFF;
  --surface-soft: #F5F8FE;
  --ink: #0E1B3D;
  --ink-2: #33415F;
  --ink-3: #5A6784;
  --line: #D9E3F1;
  --blue-50: #EDF3FD;
  --blue-100: #DCE7FA;
  --blue-300: #A9C4EE;
  --blue-500: #5B7FD6;
  --blue-600: #3F62C0;
  --blue-700: #2D4A9A;
  --sakura: #F6CADB;
  --focus: #2D4A9A;

  /* type */
  --font-display: "Archivo", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Space Grotesk", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;

  /* shape + depth */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --shadow-sm: 0 1px 2px rgba(14, 27, 61, .06), 0 2px 8px rgba(14, 27, 61, .05);
  --shadow-md: 0 10px 30px -12px rgba(14, 27, 61, .22);
  --shadow-lg: 0 40px 80px -30px rgba(14, 27, 61, .38);

  /* motion */
  --ease-out: cubic-bezier(.2, .7, .2, 1);
  --dur-fast: 180ms;
  --dur-med: 320ms;

  /* layout */
  --section: clamp(72px, 10vw, 128px);
  --nav-h: 72px;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; height: auto; }
h1, h2, h3 { font-family: var(--font-display); color: var(--ink); margin: 0; line-height: 1.05; letter-spacing: -.025em; text-wrap: balance; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
dl, dd { margin: 0; }
[hidden] { display: none !important; }

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

.container { width: min(1120px, 100% - 48px); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: 16px; top: -60px; z-index: 1000; background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 999px; transition: top var(--dur-fast); }
.skip-link:focus { top: 12px; }

.icon { width: 1.15em; height: 1.15em; flex: none; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  min-height: 44px; padding: .7rem 1.25rem; border-radius: 999px; border: 1px solid transparent;
  font-family: var(--font-body); font-weight: 600; font-size: .95rem; line-height: 1; cursor: pointer;
  transition: background-color var(--dur-fast), color var(--dur-fast), box-shadow var(--dur-med) var(--ease-out), transform var(--dur-fast);
  touch-action: manipulation;
}
.btn:active { transform: scale(.97); }
.btn--sm { min-height: 40px; padding: .55rem 1.05rem; font-size: .9rem; }
.btn--lg { padding: .95rem 1.6rem; font-size: 1rem; }
.btn--dark { background: var(--ink); color: #fff; box-shadow: 0 6px 18px -8px rgba(14, 27, 61, .6); }
.btn--dark:hover { background: #1D2F63; box-shadow: 0 10px 24px -10px rgba(14, 27, 61, .7); }
.btn--light { background: #fff; color: var(--ink); }
.btn--light:hover { background: var(--blue-50); }
.btn--glass { background: rgba(255, 255, 255, .55); border-color: rgba(255, 255, 255, .9); color: var(--ink); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.btn--glass:hover { background: rgba(255, 255, 255, .8); }
.btn .icon { transition: transform var(--dur-fast); }
.btn:hover .icon { transform: translateX(2px); }

.icon-btn {
  display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 999px; border: 0;
  background: #fff; color: var(--ink); box-shadow: var(--shadow-sm); cursor: pointer;
  transition: background-color var(--dur-fast), transform var(--dur-fast);
}
.icon-btn:hover { background: var(--blue-50); }
.icon-btn:active { transform: scale(.94); }
.icon-btn--glass { background: rgba(255, 255, 255, .16); color: #fff; box-shadow: none; border: 1px solid rgba(255, 255, 255, .35); }
.icon-btn--glass:hover { background: rgba(255, 255, 255, .28); }

.eyebrow { display: inline-flex; align-items: center; gap: .45rem; font-size: .8rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--blue-700); margin-bottom: 14px; }
.eyebrow--glass { text-transform: none; letter-spacing: 0; font-size: .875rem; color: var(--ink); background: rgba(255, 255, 255, .55); border: 1px solid rgba(255, 255, 255, .85); padding: .4rem .9rem; border-radius: 999px; backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.eyebrow--light { color: #D6E2FA; }

.section-title { font-size: clamp(2rem, 4.2vw, 3.25rem); font-weight: 700; }

/* ---------- nav ---------- */
.nav { position: fixed; inset: 0 0 auto; z-index: 50; transition: background-color var(--dur-med), box-shadow var(--dur-med); }
.nav.is-scrolled, .nav.is-open { background: rgba(238, 244, 251, .82); backdrop-filter: saturate(1.4) blur(14px); -webkit-backdrop-filter: saturate(1.4) blur(14px); box-shadow: 0 1px 0 rgba(14, 27, 61, .08); }
.nav__inner { width: min(1200px, 100% - 40px); margin-inline: auto; height: var(--nav-h); display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { display: inline-flex; align-items: center; gap: .6rem; font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; color: var(--ink); letter-spacing: -.02em; }
.logo__mark { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; background: var(--ink); color: var(--blue-100); }
.logo__mark svg { width: 22px; height: 22px; }
.nav__links { display: flex; gap: 6px; }
.nav__links a { display: inline-flex; align-items: center; min-height: 40px; padding: 0 14px; border-radius: 999px; font-size: .95rem; font-weight: 500; color: var(--ink); transition: background-color var(--dur-fast); }
.nav__links a:hover { background: rgba(255, 255, 255, .6); }
.nav__links .nav__cta-mobile { display: none; }
.nav__actions { display: flex; align-items: center; gap: 10px; }
.nav__social { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 999px; color: var(--ink); transition: background-color var(--dur-fast); }
.nav__social:hover { background: rgba(255, 255, 255, .6); }
.nav__toggle { display: none; width: 44px; height: 44px; border: 0; border-radius: 999px; background: rgba(255, 255, 255, .6); cursor: pointer; place-items: center; }
.nav__links a.btn { color: #fff; }

/* ---------- hero ---------- */
.hero { position: relative; isolation: isolate; }
.hero__bg { position: absolute; inset: 0; z-index: -1; overflow: hidden; background: #8FB9E8; }
.hero__art { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero__bg::after { content: ""; position: absolute; inset: auto 0 0; height: 120px; background: linear-gradient(to bottom, rgba(238, 244, 251, 0), var(--bg)); }

.cloud--slow { animation: drift 38s ease-in-out infinite alternate; }
.cloud--mid { animation: drift 26s ease-in-out infinite alternate-reverse; }
.cloud--fast { animation: drift-sm 18s ease-in-out infinite alternate; }
@keyframes drift { from { transform: translateX(-40px); } to { transform: translateX(40px); } }
@keyframes drift-sm { from { transform: translateX(-24px); } to { transform: translateX(24px); } }

.hero__content { text-align: center; padding: calc(var(--nav-h) + clamp(48px, 7vw, 96px)) 0 clamp(300px, 32vw, 430px); display: flex; flex-direction: column; align-items: center; }
.hero__title { font-size: clamp(2.6rem, 6.6vw, 5.4rem); font-weight: 700; letter-spacing: -.035em; line-height: 1; max-width: 13ch; margin: 18px 0 22px; }
.hero__lede { max-width: 620px; color: #22335A; font-size: clamp(1rem, 1.4vw, 1.125rem); }
.hero__cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 30px; }
.muted-sm { font-size: .72rem; color: var(--ink-3); font-weight: 400; }

/* ---------- portfolio ---------- */
.work { padding-block: clamp(56px, 8vw, 96px) var(--section); }
.section-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 24px; margin-bottom: 36px; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; }
.filter { min-height: 44px; padding: 0 18px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font-weight: 500; font-size: .92rem; cursor: pointer; transition: background-color var(--dur-fast), color var(--dur-fast), border-color var(--dur-fast); }
.filter:hover { border-color: var(--blue-300); }
.filter.is-active { background: var(--ink); border-color: var(--ink); color: #fff; }

.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.gallery__item.pop { animation: pop 420ms var(--ease-out) both; }
@keyframes pop { from { opacity: 0; transform: scale(.96) translateY(10px); } to { opacity: 1; transform: none; } }
.tile { position: relative; display: block; width: 100%; aspect-ratio: 1 / 1; padding: 0; border: 0; background: var(--blue-100); border-radius: var(--r-md); overflow: hidden; cursor: zoom-in; text-align: left; box-shadow: var(--shadow-sm); transition: box-shadow var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out); }
.tile img { width: 100%; height: 100%; object-fit: cover; transition: transform 600ms var(--ease-out); }
.tile:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.tile:hover img { transform: scale(1.035); }
.tile__info { position: absolute; inset: auto 0 0; display: grid; gap: 2px; padding: 40px 18px 16px; color: #fff; background: linear-gradient(to top, rgba(14, 27, 61, .82), rgba(14, 27, 61, 0)); opacity: 0; transform: translateY(8px); transition: opacity var(--dur-med), transform var(--dur-med) var(--ease-out); }
.tile__info strong { font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; }
.tile__info em { font-style: normal; font-size: .82rem; opacity: .9; }
.tile:hover .tile__info, .tile:focus-visible .tile__info { opacity: 1; transform: none; }
@media (hover: none) { .tile__info { opacity: 1; transform: none; }}

/* lightbox */
.lightbox { border: 0; padding: 0; background: transparent; width: min(1100px, 100% - 32px); max-width: none; max-height: none; overflow: visible; }
.lightbox::backdrop { background: rgba(14, 27, 61, .78); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
.lightbox[open] { animation: lb-in 260ms var(--ease-out); }
@keyframes lb-in { from { opacity: 0; transform: scale(.97); } to { opacity: 1; transform: none; } }
.lightbox__inner { position: relative; }
.lightbox figure { margin: 0; }
.lightbox img { width: 100%; max-height: 78vh; object-fit: contain; border-radius: var(--r-md); background: rgba(255, 255, 255, .06); }
.lightbox figcaption { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 14px; color: #fff; margin-top: 14px; }
.lightbox figcaption strong { font-family: var(--font-display); font-size: 1.2rem; font-weight: 600; }
.lightbox figcaption span { color: #D2DDF3; font-size: .92rem; }
.lightbox figcaption .muted-sm { margin-left: auto; color: #D2DDF3; }
.lightbox__close { position: absolute; top: -56px; right: 0; }
.lightbox__prev, .lightbox__next { position: absolute; top: calc(50% - 40px); }
.lightbox__prev { left: -22px; }
.lightbox__next { right: -22px; }

/* ---------- about / features ---------- */
.about { display: grid; gap: var(--section); padding-bottom: var(--section); }
.feature { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 80px); align-items: center; }
.feature__text > p { margin-top: 18px; max-width: 52ch; }
.feature__text .section-title { max-width: 16ch; }
.feature__media { position: relative; border-radius: var(--r-lg); overflow: hidden; aspect-ratio: 1 / 1.02; box-shadow: var(--shadow-md); }
.feature__bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

/* ---------- faq ---------- */
.faq { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(32px, 6vw, 80px); padding-block: 0 var(--section); align-items: start; }
.faq__intro p { margin: 16px 0 26px; max-width: 42ch; }
.accordion { display: grid; gap: 12px; }
.acc { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow-sm); transition: box-shadow var(--dur-med); }
.acc[open] { box-shadow: var(--shadow-md); }
.acc summary { list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 18px 20px; min-height: 60px; cursor: pointer; font-weight: 600; color: var(--ink); border-radius: 16px; }
.acc summary::-webkit-details-marker { display: none; }
.acc__icon { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 999px; background: var(--blue-50); flex: none; transition: transform var(--dur-med) var(--ease-out), background-color var(--dur-fast); }
.acc[open] .acc__icon { transform: rotate(45deg); background: var(--blue-100); }
.acc p { padding: 0 20px 20px; color: var(--ink-2); }

/* ---------- contact ---------- */
.contact { padding-bottom: var(--section); }
.contact__card { position: relative; overflow: hidden; isolation: isolate; text-align: center; border-radius: 32px; padding: clamp(56px, 8vw, 96px) 24px clamp(96px, 12vw, 140px); color: #DCE6FA; background: radial-gradient(circle at 50% 110%, rgba(255, 255, 255, .25), transparent 55%), linear-gradient(160deg, #5474C9 0%, #34509F 45%, #16255A 100%); box-shadow: var(--shadow-lg); }
.contact__art { position: absolute; inset: auto 0 0; width: 100%; height: 60%; z-index: -1; }
.contact__card h2 { color: #fff; font-size: clamp(2rem, 4.6vw, 3.5rem); }
.contact__card > p:not(.eyebrow) { margin: 16px auto 30px; max-width: 48ch; }
.contact__actions { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 12px; }

/* ---------- footer ---------- */
.footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; padding-block: 32px 44px; border-top: 1px solid var(--line); }
.footer__links { display: flex; flex-wrap: wrap; gap: 4px; }
.footer__links a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 12px; border-radius: 999px; color: var(--ink-2); }
.footer__links a:hover { color: var(--ink); background: var(--surface); }
.footer__copy { font-size: .88rem; color: var(--ink-3); }

/* ---------- reveal ---------- */
.js .reveal { opacity: 0; transform: translateY(20px); transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out); transition-delay: calc(var(--i, 0) * 90ms); }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .nav__links { position: absolute; top: var(--nav-h); left: 12px; right: 12px; flex-direction: column; gap: 2px; padding: 12px; background: rgba(255, 255, 255, .97); border-radius: 18px; box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transform: translateY(-8px); transition: opacity var(--dur-fast), transform var(--dur-fast), visibility var(--dur-fast); }
  .nav.is-open .nav__links { opacity: 1; visibility: visible; transform: none; }
  .nav__links a { min-height: 48px; padding: 0 14px; font-size: 1.02rem; }
  .nav__links .nav__cta-mobile { display: block; margin-top: 6px; }
  .nav__links .nav__cta-mobile .btn { width: 100%; }
  .nav__actions .btn, .nav__social { display: none; }
  .nav__toggle { display: inline-grid; }

  .intro { grid-template-columns: 1fr; }
  .feature, .faq { grid-template-columns: 1fr; }
  .feature--reverse .feature__text { order: 0; }
  .feature__media { aspect-ratio: 4 / 3.4; }
  .lightbox__prev { left: 8px; } .lightbox__next { right: 8px; }
}

@media (max-width: 600px) {
  .container { width: min(1120px, 100% - 32px); }
  .hero__content { padding-bottom: 320px; }
  .hero__art { top: auto; height: 560px; }
  .hero__cta .btn { width: 100%; }
  .eyebrow--glass { font-size: .78rem; }
  .hero__cta { width: 100%; max-width: 360px; }
  .gallery { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
  .tile__info { padding: 28px 12px 10px; }
  .tile__info strong { font-size: .92rem; }}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
  .js .reveal { opacity: 1; transform: none; }}