/* =========================================================
   Daniel Ho portfolio v2: dark-first landing page
   Tailwind (CDN) handles layout; this file handles theme + effects.
   ========================================================= */

/* ---------- Theme tokens ---------- */
:root,
[data-theme="dark"] {
  --bg: #0B0B0F;
  --fg: #F5F5F7;
  --muted: #9A9AA5;
  --accent-text: #FF8A3D;           /* small orange text: 8.4:1 on bg */
  --accent-graphic: #FF8A3D;
  --accent-soft: rgba(255, 138, 61, 0.14);
  --accent-soft-strong: rgba(255, 138, 61, 0.32);
  --grad-a: #BF5700;
  --grad-b: #FF8A3D;
  --line: rgba(255, 255, 255, 0.08);
  --glass: rgba(255, 255, 255, 0.04);
  --glass-hover: rgba(255, 255, 255, 0.07);
  --glass-border: rgba(255, 255, 255, 0.08);
  --card-solid: #111116;
  --nav-bg: rgba(17, 17, 22, 0.6);
  --sheet-bg: rgba(11, 11, 15, 0.92);
  --bubble: rgba(255, 255, 255, 0.06);
  --dot: rgba(255, 255, 255, 0.07);
  --aurora-1: rgba(191, 87, 0, 0.55);
  --aurora-2: rgba(255, 138, 61, 0.35);
  --aurora-3: rgba(255, 186, 120, 0.18);
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #FAF7F2;
  --fg: #16161A;
  --muted: #5B6168;                 /* 5.8:1 on bg */
  --accent-text: #A34A00;           /* 5.5:1 on bg */
  --accent-graphic: #BF5700;
  --accent-soft: rgba(191, 87, 0, 0.1);
  --accent-soft-strong: rgba(191, 87, 0, 0.24);
  --grad-a: #A34A00;
  --grad-b: #D9661A;
  --line: rgba(22, 22, 26, 0.1);
  --glass: rgba(255, 255, 255, 0.7);
  --glass-hover: rgba(255, 255, 255, 0.95);
  --glass-border: rgba(22, 22, 26, 0.08);
  --card-solid: #FFFFFF;
  --nav-bg: rgba(255, 255, 255, 0.7);
  --sheet-bg: rgba(250, 247, 242, 0.96);
  --bubble: rgba(22, 22, 26, 0.04);
  --dot: rgba(22, 22, 26, 0.09);
  --aurora-1: rgba(191, 87, 0, 0.22);
  --aurora-2: rgba(255, 138, 61, 0.2);
  --aurora-3: rgba(255, 186, 120, 0.16);
  --shadow: 0 20px 50px -24px rgba(22, 22, 26, 0.25);
  color-scheme: light;
}

/* ---------- Base ---------- */
html {
  background: var(--bg);
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}
body {
  background: var(--bg);
  overflow-x: hidden;
  transition: background-color .4s ease, color .4s ease;
}
::selection { background: var(--accent-soft-strong); }

:focus-visible {
  outline: 2px solid var(--accent-graphic);
  outline-offset: 3px;
  border-radius: 8px;
}

.skip-link {
  position: fixed; left: 16px; top: -60px; z-index: 100;
  padding: 10px 16px; border-radius: 10px;
  background: var(--card-solid); color: var(--fg);
  border: 1px solid var(--glass-border);
  transition: top .2s ease;
}
.skip-link:focus { top: 16px; }

.glass {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.grad-text {
  background: linear-gradient(90deg, var(--grad-a), var(--grad-b));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  padding-right: .06em; /* keep italic edge from clipping */
}

.eyebrow {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent-text);
}

.section-title {
  font-size: clamp(2rem, 4.6vw, 3.25rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

/* ---------- Buttons ---------- */
.btn-solid,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  line-height: 1.2;
  cursor: pointer;
  transition: transform .25s cubic-bezier(.22,1,.36,1), box-shadow .25s ease, background-color .2s ease, border-color .2s ease, color .2s ease;
}
.btn-solid svg, .btn-ghost svg {
  fill: none; stroke: currentColor; stroke-width: 2;
  stroke-linecap: round; stroke-linejoin: round;
}
.btn-solid {
  color: #0B0B0F;                   /* 6.6–8.4:1 across the gradient */
  background: linear-gradient(135deg, #FF8A3D, #E8761F);
  box-shadow: 0 10px 28px -10px rgba(255, 138, 61, .7), inset 0 1px 0 rgba(255, 255, 255, .35);
}
.btn-solid:hover { transform: translateY(-2px); box-shadow: 0 16px 36px -10px rgba(255, 138, 61, .8), inset 0 1px 0 rgba(255, 255, 255, .35); }
.btn-solid:active, .btn-ghost:active { transform: translateY(0) scale(.98); }
.btn-ghost {
  color: var(--fg);
  background: var(--glass);
  border: 1px solid var(--glass-border);
}
.btn-ghost:hover { transform: translateY(-2px); background: var(--glass-hover); border-color: var(--accent-soft-strong); }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px; height: 38px;
  border-radius: 999px;
  color: var(--fg);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: background-color .2s ease, transform .2s ease;
}
.icon-btn:hover { background: var(--glass-hover); }
.icon-btn:active { transform: scale(.94); }
.icon-btn svg {
  width: 18px; height: 18px;
  fill: none; stroke: currentColor; stroke-width: 2;
  stroke-linecap: round; stroke-linejoin: round;
}
.i-moon { display: none; }
[data-theme="light"] .i-sun { display: none; }
[data-theme="light"] .i-moon { display: block; }

/* ---------- Floating pill nav ---------- */
.nav-wrap {
  position: fixed;
  top: 14px; left: 0; right: 0;
  z-index: 50;
  display: flex;
  justify-content: center;
  padding: 0 14px;
  pointer-events: none;
}
.nav-pill {
  pointer-events: auto;
  width: 100%;
  max-width: 760px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 7px 7px 8px;
  border-radius: 999px;
  background: var(--nav-bg);
  border: 1px solid var(--glass-border);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  backdrop-filter: saturate(160%) blur(16px);
  box-shadow: var(--shadow);
  transition: background-color .3s ease, box-shadow .3s ease;
}
.logo {
  display: inline-grid;
  place-items: center;
  width: 38px; height: 38px;
  border-radius: 999px;
  background: linear-gradient(135deg, #BF5700, #FF8A3D);
  color: #0B0B0F;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: .85rem;
  transition: transform .3s cubic-bezier(.22,1,.36,1);
}
.logo:hover { transform: rotate(-8deg) scale(1.06); }
.nav-link {
  display: block;
  padding: 7px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 500;
  transition: color .2s ease, background-color .2s ease;
}
.nav-link:hover, .nav-link.is-active { color: var(--fg); background: var(--glass-hover); }
.nav-cta { display: none; padding: 8px 16px; font-size: .875rem; }

/* burger: 2 bars → X */
.burger { gap: 0; }
.burger span {
  grid-area: 1 / 1;
  width: 16px; height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .3s cubic-bezier(.22,1,.36,1);
}
.burger span:nth-child(1) { transform: translateY(-3.5px); }
.burger span:nth-child(2) { transform: translateY(3.5px); }
.burger[aria-expanded="true"] span:nth-child(1) { transform: rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { transform: rotate(-45deg); }

/* full-screen mobile sheet */
.sheet {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  flex-direction: column;
  padding: 112px 24px 40px;
  background: var(--sheet-bg);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s ease, visibility .3s;
}
.sheet.is-open { opacity: 1; visibility: visible; }
.sheet-link {
  display: block;
  padding: 10px 4px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--fg);
  border-bottom: 1px solid var(--line);
  transform: translateY(12px);
  opacity: 0;
  transition: transform .45s cubic-bezier(.22,1,.36,1), opacity .45s ease, color .2s ease;
}
.sheet-link:hover { color: var(--accent-text); }
.sheet.is-open .sheet-link { transform: none; opacity: 1; }
.sheet.is-open li:nth-child(2) .sheet-link { transition-delay: .04s; }
.sheet.is-open li:nth-child(3) .sheet-link { transition-delay: .08s; }
.sheet.is-open li:nth-child(4) .sheet-link { transition-delay: .12s; }
.sheet-cta { margin-top: 40px; width: 100%; justify-content: center; }

@media (min-width: 720px) {
  .nav-cta { display: inline-flex; }
  .burger, .sheet { display: none; }
}

/* ---------- Hero ---------- */
.hero::before {               /* faint dot grid */
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--dot) 1px, transparent 1.2px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 35%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 35%, #000 30%, transparent 75%);
  pointer-events: none;
}
.aurora { position: absolute; inset: 0; pointer-events: none; }
.aurora__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  will-change: transform;
}
.aurora__blob--1 {
  width: 520px; height: 360px; left: 50%; top: 60px; margin-left: -380px;
  background: var(--aurora-1);
  animation: drift1 16s ease-in-out infinite alternate;
}
.aurora__blob--2 {
  width: 440px; height: 320px; left: 50%; top: 20px; margin-left: -40px;
  background: var(--aurora-2);
  animation: drift2 20s ease-in-out infinite alternate;
}
.aurora__blob--3 {
  width: 360px; height: 240px; left: 50%; top: 240px; margin-left: -180px;
  background: var(--aurora-3);
  animation: drift1 24s ease-in-out infinite alternate-reverse;
}
@keyframes drift1 { to { transform: translate(60px, 30px) scale(1.12); } }
@keyframes drift2 { to { transform: translate(-70px, 40px) scale(.92); } }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 12px;
  border-radius: 999px;
  font-size: .82rem;
  font-weight: 500;
  color: var(--fg);
  background: var(--glass);
  border: 1px solid var(--glass-border);
}
.badge__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #22C55E;
  box-shadow: 0 0 0 0 rgba(34, 197, 94, .6);
  animation: ping 2s ease-out infinite;
}
@keyframes ping { 70%, 100% { box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); } }

.hero-title {
  font-size: clamp(2.75rem, 8vw, 6rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--fg);
  text-wrap: balance;
}

.plot-card { padding-bottom: 6px; box-shadow: var(--shadow); text-align: left; }
.plot { display: block; width: 100%; height: auto; }
.plot__grid line { stroke: var(--line); stroke-width: 1; }
.plot__pts circle { fill: var(--accent-soft-strong); }
.plot__fit {
  stroke: url(#fit-grad);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 600;
  stroke-dashoffset: 600;
  animation: draw 1.8s cubic-bezier(.65,0,.35,1) .5s forwards;
}
@keyframes draw { to { stroke-dashoffset: 0; } }

/* ---------- Marquee ---------- */
.marquee {
  display: flex;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.marquee__track {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  animation: marquee 36s linear infinite;
}
.marquee:hover .marquee__track { animation-play-state: paused; }
.marquee__track li {
  display: flex;
  align-items: center;
  padding: 0 22px;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--muted);
  white-space: nowrap;
  transition: color .2s ease;
}
.marquee__track li:hover { color: var(--fg); }
.marquee__track li::after {
  content: "";
  width: 5px; height: 5px;
  margin-left: 44px;
  border-radius: 50%;
  background: var(--accent-graphic);
  opacity: .6;
}
@keyframes marquee { to { transform: translateX(-100%); } }

/* ---------- Stats ---------- */
.stat {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  padding: 28px;
  transition: transform .3s ease, border-color .3s ease;
}
.stat:hover { transform: translateY(-3px); border-color: var(--accent-soft-strong); }
.stat__num {
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
}

/* ---------- Bento ---------- */
.bento {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
.tile {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 24px;
  transition: transform .35s cubic-bezier(.22,1,.36,1), border-color .3s ease, box-shadow .35s ease;
}
.tile::before {               /* cursor-following glow */
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(360px circle at var(--mx, 50%) var(--my, 50%), var(--accent-soft-strong), transparent 60%);
  opacity: 0;
  transition: opacity .3s ease;
  pointer-events: none;
}
.tile:hover { transform: translateY(-4px); border-color: var(--accent-soft-strong); box-shadow: var(--shadow); }
.tile:hover::before { opacity: .55; }
.tile > * { position: relative; }

.tile__kicker {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}
.tile__title {
  margin-top: 6px;
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.tile__desc { margin-top: 10px; color: var(--muted); font-size: .95rem; line-height: 1.6; flex-grow: 1; }

.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 18px; }
.tags li {
  padding: 4px 10px;
  border-radius: 999px;
  font-size: .76rem;
  font-weight: 500;
  color: var(--muted);
  background: var(--glass);
  border: 1px solid var(--glass-border);
}
.tile__link {
  align-self: flex-start;
  margin-top: 18px;
  font-size: .92rem;
  font-weight: 600;
  color: var(--accent-text);
}
.tile__link span { display: inline-block; transition: transform .25s ease; }
.tile__link:hover span { transform: translateX(4px); }

.mini { display: block; width: 100%; height: 70px; margin-bottom: 20px; }
.mini__line { fill: none; stroke: var(--accent-graphic); stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.mini__area { fill: var(--accent-soft); }
.mini__bar { fill: var(--accent-soft-strong); transition: fill .3s ease; }
.mini__bar--hi, .tile:hover .mini__bar:hover { fill: var(--accent-graphic); }
.mini__bracket { fill: none; stroke: var(--muted); stroke-width: 2; opacity: .55; stroke-linejoin: round; }
.mini__dot { fill: var(--accent-graphic); }

.tile--featured .tile__title { font-size: clamp(1.75rem, 3.6vw, 2.5rem); }
.tile--featured .tile__body { display: flex; flex-direction: column; }

/* mock chat */
.chat { display: flex; flex-direction: column; gap: 10px; margin-top: 28px; }
.chat__msg {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 16px 16px 16px 4px;
  font-size: .9rem;
  line-height: 1.45;
  color: var(--fg);
  background: var(--bubble);
  border: 1px solid var(--glass-border);
}
.chat__who { display: block; margin-bottom: 2px; font-size: .72rem; font-weight: 600; color: var(--accent-text); }
.chat__msg--me {
  align-self: flex-end;
  border-radius: 16px 16px 4px 16px;
  color: #0B0B0F;
  font-weight: 600;
  background: linear-gradient(135deg, #FF8A3D, #E8761F);
  border-color: transparent;
}
.chat__msg--me .chat__who { color: #0B0B0F; }
.js .tile--featured .chat__msg { opacity: 0; transform: translateY(8px); }
.js .tile--featured.is-visible .chat__msg { animation: pop .5s cubic-bezier(.22,1,.36,1) forwards; }
.js .tile--featured.is-visible .chat__msg:nth-child(2) { animation-delay: .35s; }
.js .tile--featured.is-visible .chat__msg:nth-child(3) { animation-delay: .7s; }
.js .tile--featured.is-visible .chat__msg:nth-child(4) { animation-delay: 1.05s; }
@keyframes pop { to { opacity: 1; transform: none; } }

@media (min-width: 720px) {
  .bento { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .tile--featured {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: center;
    padding: 36px;
  }
  .tile--featured .chat { margin-top: 0; }
}

/* ---------- About ---------- */
.steps { display: grid; gap: 12px; }
.step {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 18px 20px;
  border-radius: 16px;
  transition: transform .3s ease, border-color .3s ease;
}
.step:hover { transform: translateX(4px); border-color: var(--accent-soft-strong); }
.step__n { font-size: .9rem; font-weight: 700; color: var(--accent-text); padding-top: 2px; }
.step__t { font-weight: 600; color: var(--fg); }
.step__d { margin-top: 2px; font-size: .92rem; color: var(--muted); }

.timeline { border-left: 1px solid var(--line); margin-left: 4px; display: grid; gap: 22px; }
.timeline li { position: relative; padding-left: 22px; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -5px; top: 6px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: linear-gradient(135deg, #BF5700, #FF8A3D);
  box-shadow: 0 0 0 4px var(--bg);
}
.timeline__date { font-size: .78rem; font-weight: 600; color: var(--accent-text); }
.timeline__t { font-weight: 600; color: var(--fg); }
.timeline__d { font-size: .92rem; color: var(--muted); }

/* ---------- Final CTA ---------- */
.cta-card {
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: clamp(48px, 8vw, 96px) 22px;
  border-radius: 28px;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--card-solid), var(--card-solid)) padding-box,
    linear-gradient(135deg, #BF5700, #FF8A3D 45%, var(--glass-border) 80%) border-box;
  box-shadow: var(--shadow);
}
.cta-card__glow {
  position: absolute;
  left: 50%; top: -180px;
  width: 640px; height: 360px;
  margin-left: -320px;
  border-radius: 50%;
  background: var(--aurora-1);
  filter: blur(90px);
  opacity: .7;
  pointer-events: none;
}
.cta-title {
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.footer-link { transition: color .2s ease; }
.footer-link:hover { color: var(--fg); }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%; bottom: 24px;
  z-index: 60;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--fg);
  background: var(--card-solid);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  transform: translate(-50%, 16px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .3s cubic-bezier(.22,1,.36,1);
}
.toast.is-shown { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Reveal on scroll ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .8s cubic-bezier(.22,1,.36,1), transform .8s cubic-bezier(.22,1,.36,1);
}
.js .reveal.is-visible { opacity: 1; transform: none; }
.js .tile.reveal.is-visible,
.js .stat.reveal.is-visible {
  transition: opacity .8s cubic-bezier(.22,1,.36,1), transform .35s cubic-bezier(.22,1,.36,1), border-color .3s ease, box-shadow .35s ease;
}

/* ---------- Reduced motion: everything static and visible ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  .js .reveal,
  .js .tile--featured .chat__msg,
  .sheet-link { opacity: 1 !important; transform: none !important; }
  .plot__fit { stroke-dashoffset: 0; }
  .marquee { -webkit-mask-image: none; mask-image: none; justify-content: center; }
  .marquee__track { flex-wrap: wrap; justify-content: center; flex-shrink: 1; row-gap: 10px; padding: 0 16px; }
  .marquee__track[aria-hidden="true"] { display: none; }
  .marquee__track li { padding: 0 12px; }
  .marquee__track li::after { margin-left: 24px; }
}