/* ============================================================
   THEME VARIABLES — :root = DARK (default), [data-theme="light"] = LIGHT
   ============================================================ */
:root {
  --bg: #15161b;
  --surface: #25272f;
  --ink: #f2f3f5;
  --muted: #9ba1ac;
  --card: rgba(42, 45, 54, 0.7);
  --border: rgba(255, 255, 255, 0.1);
  --shadow: rgba(0, 0, 0, 0.35);
  --glow-1: rgba(50, 138, 240, 0.14);
  --glow-2: rgba(204, 85, 0, 0.1);
  --cta-hover: rgba(255, 255, 255, 0.12);
  --topleft-bg: rgba(96, 165, 250, 0.2); /* sky blue bg */
  --topleft-fg: #60a5fa; /* sky blue text */
  --topright-bg: rgba(120, 190, 50, 0.18);
  --topright-fg: #a6e56a;
  --bottomleft-bg: rgba(251, 146, 60, 0.22); /* was rgba(204, 85, 0, 0.20) */
  --bottomleft-fg: #ffb680; /* was #ff9a52 */
  --bottomright-bg: rgba(138, 90, 48, 0.22);
  --bottomright-fg: #d5a374;
  --radius: 24px;

  /* ---- Keyword chip tints (DARK) — silver · gold · sky blue ---- */
  --chip-name-tint: 203, 213, 225; /* silver      */
  --chip-role-tint: 251, 191, 36; /* warm gold      */
  --chip-place-tint: 125, 211, 252; /* sky blue       */

  --chip-glass-bg: rgba(255, 255, 255, 0.04);
  --chip-glass-hi: rgba(255, 255, 255, 0.09);
  --chip-glass-line: rgba(255, 255, 255, 0.1);
}
[data-theme="light"] {
  --bg: #eff1f4;
  --surface: #ffffff;
  --ink: #0f1115;
  --muted: #8b8f98;
  --card: rgba(255, 255, 255, 0.6);
  --border: rgba(15, 17, 21, 0.08);
  --shadow: rgba(0, 0, 0, 0.06);
  --glow-1: rgba(50, 138, 240, 0.19);
  --glow-2: rgba(204, 85, 0, 0.16);
  --cta-hover: rgba(0, 0, 0, 0.25);
  --topleft-bg: #dbeafe; /* light sky bg */
  --topleft-fg: #3e85e9; /* deep sky text */
  --topright-bg: #dcf2c4;
  --topright-fg: #4e9d1f;
  --bottomleft-bg: #ffe4cc; /* was #ffd4b8 */
  --bottomleft-fg: #e58248; /* was #cc5500 */
  --bottomright-bg: #ecdfd1;
  --bottomright-fg: #8a5a30;

  /* ---- Keyword chip tints (LIGHT) — deeper, more saturated ---- */
  --chip-name-tint: 71, 85, 105; /* silver      */
  --chip-role-tint: 180, 120, 10; /* rich gold      */
  --chip-place-tint: 14, 165, 233; /* deep sky blue  */

  --chip-glass-bg: rgba(255, 255, 255, 0.55);
  --chip-glass-hi: rgba(255, 255, 255, 0.85);
  --chip-glass-line: rgba(15, 17, 21, 0.08);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  font-family:
    "Inter",
    system-ui,
    -apple-system,
    sans-serif;
  background: var(--bg);
  color: var(--ink);
  overflow-x: hidden;
  transition:
    background 0.35s ease,
    color 0.35s ease;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(60% 50% at 50% 30%, var(--glow-1), transparent 70%),
    radial-gradient(40% 40% at 80% 80%, var(--glow-2), transparent 70%);
  transition: background 0.35s ease;
}

/* ===== NAVBAR ===== */
.navbar {
  position: sticky;
  top: 18px;
  z-index: 50;
  padding: 0 16px;
  animation: dropIn 0.7s ease both;
}
.navbar__inner {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  background: var(--card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 30px var(--shadow);
}

/* ===== BRAND ===== */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
  padding: 8px 18px 8px 8px;
  border-radius: 16px;
  border: 1px solid transparent;
  transition:
    background 0.3s ease,
    border-color 0.3s ease,
    transform 0.25s ease;
}
.brand:hover {
  background: var(--card);
  border-color: var(--border);
  transform: translateY(-1px);
}
.brand__logo {
  width: 40px;
  height: 40px;
  padding: 6px;
  background: var(--surface);
  border-radius: 12px;
  box-shadow: 0 4px 12px var(--shadow);
  border: 1px solid var(--border);
  object-fit: contain;
  display: block;
}
.brand__name {
  font-weight: 600;
  font-size: 1.15rem;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: 22px;
}
.navbar__links a {
  position: relative;
  text-decoration: none;
  color: var(--muted);
  font-weight: 500;
  padding: 6px 2px;
  transition: color 0.25s;
}
.navbar__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: width 0.3s;
}
.navbar__links a:hover {
  color: var(--ink);
}
.navbar__links a:hover::after {
  width: 100%;
}

/* ===== THEME TOGGLE ===== */
.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 4px 12px var(--shadow);
  transition:
    transform 0.2s ease,
    background 0.3s ease,
    color 0.3s ease;
}
.theme-toggle:hover {
  transform: translateY(-2px) rotate(12deg);
}
.theme-toggle .icon {
  transition:
    opacity 0.3s ease,
    transform 0.4s ease;
}
.icon--moon {
  display: none;
}
[data-theme="light"] .icon--sun {
  display: none;
}
[data-theme="light"] .icon--moon {
  display: block;
}

/* ===== HERO ===== */
.hero {
  position: relative;
  max-width: 1240px;
  margin: 0 auto;
  z-index: 1;
  min-height: calc(100vh - 100px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}
.hero__content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 620px;
  margin: 0 auto;
  animation: rise 0.9s ease 0.2s both;
}
.avatar {
  width: 96px;
  height: 96px;
  margin: 0 auto 24px;
  border-radius: 26px;
  box-shadow: 0 12px 30px var(--shadow);
  border: 1px solid var(--border);
  animation: float 5s ease-in-out infinite;
  object-fit: cover;
  object-position: center;
  display: block;
}
.hero__greeting {
  color: var(--muted);
  font-size: 1.4rem;
  font-weight: 600; /* ← add this line */
  margin-bottom: 35px;
}
.hero__title {
  font-size: clamp(1.4rem, 3vw, 2rem); /* ↓ was clamp(1.8rem, 4.5vw, 3rem) */
  font-weight: 700;
  line-height: 2;
  letter-spacing: -0.02em;
  margin-bottom: 45px;
  color: var(--ink);
}
.hero__desc {
  max-width: 520px;
  margin: 0 auto 32px;
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.6;
}

/* ============================================================
   ✨ KEYWORD CHIPS — Editorial Glass
   Yifan Liang · Financial Engineer · Hong Kong
   ============================================================ */
.chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.55em; /* ↑ more space icon↔text */
  padding: 0.32em 0.95em 0.32em 1.1em; /* ↑ looser padding */
  border-radius: 0.75em; /* ↑ softer corners */

  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
  white-space: nowrap;
  vertical-align: middle;

  color: rgb(var(--chip-tint));
  background: linear-gradient(
    180deg,
    var(--chip-glass-hi) 0%,
    var(--chip-glass-bg) 100%
  );
  border: 1px solid var(--chip-glass-line);
  box-shadow:
    0 4px 14px -6px rgba(var(--chip-tint), 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);

  transition:
    transform 0.28s ease,
    box-shadow 0.28s ease,
    border-color 0.28s ease;
}
.chip::before {
  content: "";
  position: absolute;
  left: 0.42em; /* ↑ moved to match new padding */
  top: 22%;
  bottom: 22%;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    rgba(var(--chip-tint), 0.9),
    rgba(var(--chip-tint), 0.2)
  );
}
.chip:hover {
  transform: translateY(-2px);
  border-color: rgba(var(--chip-tint), 0.4);
  box-shadow:
    0 10px 24px -8px rgba(var(--chip-tint), 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}
.chip__icon {
  width: 1em;
  height: 1em;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 1px 2px rgba(var(--chip-tint), 0.35));
}
.chip__text {
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* ✅ Chips inside the huge title get a slightly larger fixed size */
.hero__title .chip {
  font-size: clamp(1.2rem, 2.2vw, 1.6rem);
}

/* Per-chip color identities */
.chip--name {
  --chip-tint: var(--chip-name-tint);
}
.chip--role {
  --chip-tint: var(--chip-role-tint);
}
.chip--place {
  --chip-tint: var(--chip-place-tint);
}

/* ===== CTA BUTTON (shared: main page + 404) ===== */
.cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--ink);
  color: var(--bg);
  text-decoration: none;
  font-weight: 600;
  padding: 15px 26px;
  border-radius: 999px;
  transition:
    transform 0.2s,
    box-shadow 0.2s;
}
.cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px var(--cta-hover);
}
.cta__icon {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ffb347, #ff6b6b);
  color: #fff;
  transition: transform 0.3s;
  flex-shrink: 0;
}
.cta:hover .cta__icon {
  transform: rotate(45deg);
}

/* ===== FLOATING TAGS ===== */
.tag {
  position: absolute;
  z-index: 1;
  padding: 9px 18px 9px 31px;
  border-radius: 16px;
  font-weight: 700;
  box-shadow: 0 12px 28px var(--shadow);
  border: 1px solid var(--border);
  animation: float 6s ease-in-out infinite;
  will-change: transform, translate;
  white-space: nowrap;
  transition:
    background 0.35s ease,
    color 0.35s ease;
}
.tag::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 50%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.7;
  transform: translateY(-50%);
}
.tag--topleft {
  background: var(--topleft-bg);
  color: var(--topleft-fg);
  transform: rotate(-8deg);
  animation-delay: 0s;
}
.tag--topright {
  background: var(--topright-bg);
  color: var(--topright-fg);
  transform: rotate(8deg);
  animation-delay: 1.2s;
}
.tag--bottomleft {
  background: var(--bottomleft-bg);
  color: var(--bottomleft-fg);
  transform: rotate(8deg);
  animation-delay: 0.6s;
}
.tag--bottomright {
  background: var(--bottomright-bg);
  color: var(--bottomright-fg);
  transform: rotate(-6deg);
  animation-delay: 1.8s;
}

/* --- RESPONSIVE TAG POSITIONS --- */
.tag {
  font-size: 0.8rem;
}
.tag--topleft {
  top: 14%;
  left: 0;
}
.tag--topright {
  top: 12%;
  right: 0;
}
.tag--bottomleft {
  top: auto;
  bottom: 1%;
  left: 0;
}
.tag--bottomright {
  top: auto;
  bottom: -2%;
  right: 0;
}
@media (min-width: 640px) {
  .tag {
    font-size: 1.08rem;
    padding: 10px 20px 10px 33px;
  }
  .tag--topleft {
    top: 22%;
    left: 3%;
  }
  .tag--topright {
    top: 20%;
    right: 3%;
  }
  .tag--bottomleft {
    top: auto;
    bottom: 1%;
    left: 5%;
  }
  .tag--bottomright {
    top: auto;
    bottom: -1%;
    right: 5%;
  }
  .hero__greeting {
    font-size: 1.5rem;
  }
  .hero__desc {
    font-size: 1.15rem;
  }
}
@media (min-width: 1025px) {
  .tag {
    font-size: 1.35rem;
    padding: 11px 22px 11px 36px;
  }
  .tag::before {
    left: 15px;
  }
  .tag--topleft {
    top: 28%;
    left: 2%;
  }
  .tag--topright {
    top: 26%;
    right: 2%;
  }
  .tag--bottomleft {
    top: auto;
    bottom: 2%;
    left: 4%;
  }
  .tag--bottomright {
    top: auto;
    bottom: 0;
    right: 4%;
  }
}
@media (min-width: 1400px) {
  .tag {
    font-size: 1.44rem;
  }
  .tag--topleft {
    top: 30%;
    left: 4%;
  }
  .tag--topright {
    top: 28%;
    right: 4%;
  }
  .tag--bottomleft {
    top: auto;
    bottom: 3%;
    left: 6%;
  }
  .tag--bottomright {
    top: auto;
    bottom: 1%;
    right: 6%;
  }
}
@media (max-height: 560px) {
  .tag--topleft,
  .tag--topright {
    top: 10%;
  }
  .tag--bottomleft,
  .tag--bottomright {
    top: auto;
    bottom: 0;
  }
}

/* ===== CONTACT PAGE ===== */
.contact {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
  padding: 60px 20px 20px;
}
.contact__intro {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 40px;
  animation: rise 0.9s ease 0.1s both;
}
.contact__title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--ink);
}
.contact__desc {
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.75;
  max-width: 38rem;
  margin: 0 auto;
}
/* ===== WAVING HAND on CONTACT PAGE ===== */
.contact__wave {
  display: inline-block;
  width: 1em; /* scales with parent font size */
  height: 1em;
  vertical-align: -0.15em; /* aligns nicely with text baseline */
  margin-left: 0.2em;
  /* No CSS animation needed — the .png is self-animating */
}
/* ===== KNOCKED-OUT FACE on 404 PAGE ===== */
.notfound__emoji {
  display: inline-block;
  width: 1.1em;
  height: 1.1em;
  vertical-align: -0.2em;
  margin-left: 0.3em;
}
.contact__frame {
  background: var(--card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 30px var(--shadow);
  padding: 14px;
  overflow: hidden;
  animation: rise 0.9s ease 0.25s both;
}
.contact__embed {
  border-radius: calc(var(--radius) - 8px);
  overflow: hidden;
  transform: translateZ(0);
  line-height: 0;
}
.contact__frame iframe {
  /* +scrollbar width (--sbw set by script.js) so the iframe's own scrollbar,
     which takes layout space on Windows, falls outside the rounded clip. */
  width: calc(100% + var(--sbw, 17px));
  height: 80vh;
  border: 0;
  display: block;
  background: transparent;
}
@media (min-width: 640px) {
  .contact {
    padding: 80px 24px 20px;
  }
}

/* ===== 404 PAGE ===== */
.notfound {
  position: relative;
  z-index: 1;
  min-height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 20px 90px;
}
.notfound__content {
  animation: rise 0.9s ease 0.1s both;
  max-width: 760px;
}
.notfound__title {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  background: linear-gradient(90deg, #2563eb, #93c5fd);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.notfound__desc {
  color: var(--muted);
  font-size: 1.15rem;
  line-height: 1.7;
  margin-bottom: 36px;
}

/* ===== FOOTER ===== */
.site-footer {
  position: relative;
  z-index: 1;
  padding: 70px 16px;
}
.footer__box {
  max-width: 1240px;
  margin: 0 auto;
  background: var(--card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 30px var(--shadow);
  padding: 40px 44px;
}
.footer__box .brand {
  margin-bottom: 24px;
  align-self: flex-start;
}
.footer__text p {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.5;
  margin-bottom: 10px;
}
.footer__text p:last-child {
  margin-bottom: 0;
}
@media (min-width: 640px) {
  .site-footer {
    padding: 90px 24px;
  }
  .footer__box {
    padding: 44px 52px;
  }
}

/* ===== KEYFRAMES ===== */
@keyframes float {
  0%,
  100% {
    translate: 0 0;
  }
  50% {
    translate: 0 -12px;
  }
}
@keyframes dropIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}