:root {
  color-scheme: dark;
  --bg: #07111f;
  --bg-2: #0d1d33;
  --panel: rgba(10, 20, 38, 0.72);
  --panel-strong: rgba(14, 26, 49, 0.9);
  --text: #eef4ff;
  --muted: #9fb4d8;
  --line: rgba(159, 180, 216, 0.18);
  --accent: #67d7ff;
  --accent-2: #8dffcb;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f8ff;
  --bg-2: #e6eefc;
  --panel: rgba(255, 255, 255, 0.74);
  --panel-strong: rgba(255, 255, 255, 0.92);
  --text: #122033;
  --muted: #51627c;
  --line: rgba(18, 32, 51, 0.12);
  --accent: #0ea5e9;
  --accent-2: #10b981;
  --shadow: 0 24px 60px rgba(20, 31, 48, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(103, 215, 255, 0.16), transparent 28%),
    radial-gradient(circle at bottom right, rgba(141, 255, 203, 0.12), transparent 30%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  color: var(--text);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
body.history-home::selection { color: #210b16; background: #ff76a8; }

.bg-orb {
  position: fixed;
  inset: auto;
  width: 28rem;
  height: 28rem;
  border-radius: 50%;
  filter: blur(44px);
  opacity: 0.22;
  pointer-events: none;
}

.bg-orb-a { top: -8rem; left: -8rem; background: var(--accent); }
.bg-orb-b { right: -10rem; bottom: -10rem; background: var(--accent-2); }

.topbar, .shell, .footer { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; }
.topbar {
  position: sticky;
  top: 1rem;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  padding: .9rem 1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.brand {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: 1rem;
  letter-spacing: .08em;
  font-weight: 700;
}

.nav {
  display: flex;
  gap: 1rem;
  margin-left: auto;
}

.nav a, .icon-btn {
  color: var(--muted);
}

.nav a:hover, .icon-btn:hover { color: var(--text); }

.icon-btn {
  border: 1px solid var(--line);
  background: var(--panel-strong);
  border-radius: .9rem;
  width: 2.6rem;
  height: 2.6rem;
  cursor: pointer;
}

.menu-btn { display: none; }

.shell { padding: 3rem 0 4rem; }

.hero, .section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  grid-template-columns: 1.4fr .9fr;
  gap: 1.2rem;
  padding: 2rem;
  align-items: center;
}

.hero-copy {
  display: grid;
  align-content: start;
}

.eyebrow {
  margin: 0 0 .5rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .18em;
  font-size: .76rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

h1, h2, .brand { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif; }
h1 { margin: 0; font-size: clamp(2.4rem, 7vw, 5rem); line-height: .95; }
h2 { margin: 0; font-size: clamp(1.4rem, 3vw, 2rem); }
.lead { max-width: 34rem; color: var(--muted); font-size: 1.05rem; line-height: 1.8; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-top: 1.5rem;
}

.btn {
  padding: .85rem 1.1rem;
  border-radius: .95rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #04111c;
  border: 0;
  font-weight: 700;
}

.profile-card, .card {
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 1.2rem;
}

.profile-card {
  padding: 1.3rem;
  display: grid;
  gap: 1rem;
}

.avatar-container {
  width: 260px;
  height: 260px;
  margin: 0 auto 1.5rem;
}

.avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 1rem;
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

.meta {
  display: grid;
  gap: .25rem;
}

.meta span, .card p, .card span { color: var(--muted); }

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .7rem;
}

.stats div, .card {
  padding: 1rem;
}

.stats div {
  border: 1px solid var(--line);
  border-radius: 1rem;
  text-align: center;
}

.stats b {
  display: block;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: 1.4rem;
}

.section { margin-top: 1.2rem; padding: 1.5rem; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 1rem; margin-bottom: 1rem; }

.grid { display: grid; gap: 1rem; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.link-card, .post-card { display: grid; gap: .45rem; }
.link-card .tag {
  width: fit-content;
  padding: .22rem .55rem;
  border-radius: 999px;
  font-size: .72rem;
  letter-spacing: .08em;
  background: rgba(103, 215, 255, .14);
  color: var(--accent);
}
.link-card strong, .post-card strong { font-size: 1.08rem; }

.post-card {
  min-height: 8rem;
  background:
    linear-gradient(180deg, rgba(255,255,255,.02), transparent 65%),
    var(--panel-strong);
}

.featured {
  min-height: 11rem;
  padding: 1.2rem;
  margin-bottom: 1rem;
}

.feed {
  display: grid;
  gap: 1rem;
}

.card h3 {
  margin: 0 0 .4rem;
  font-size: 1.05rem;
}

.quote-card {
  display: grid;
  gap: .6rem;
  align-content: start;
}

.quote-mark {
  margin: 0;
  color: var(--accent);
  font-size: 2.8rem;
  line-height: 1;
}

.large {
  min-height: 100%;
}

.card:hover, .btn:hover, .icon-btn:hover, .link-card:hover, .post-card:hover {
  transform: translateY(-2px);
  transition: .22s ease;
  border-color: var(--accent);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.footer {
  padding: 1.5rem 0 2.5rem;
  text-align: center;
  color: var(--muted);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal.visible, .card:hover, .btn:hover, .icon-btn:hover, .link-card:hover, .post-card:hover {
    transition: none;
    transform: none;
  }
}

@media (max-width: 860px) {
  .hero, .grid.two, .grid.three { grid-template-columns: 1fr; }
  .nav {
    display: none;
    position: absolute;
    top: calc(100% + .6rem);
    left: 0;
    right: 0;
    padding: 1rem;
    flex-direction: column;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 1rem;
  }
  .nav.open { display: flex; }
  .menu-btn { display: inline-grid; margin-left: auto; }
  .topbar { position: relative; }
}

/* ===== Blog platform badges ===== */
.tag.cnblogs { background: rgba(0, 121, 211, 0.15); color: #0079d3; }
.tag.csdn { background: rgba(255, 80, 0, 0.15); color: #ff5000; }
.tag.new-site { background: rgba(103, 215, 255, 0.15); color: var(--accent); }
.tag.reference { background: rgba(255, 200, 50, 0.12); color: #ffc832; }
.tag.pwn { background: rgba(255, 107, 107, 0.15); color: #ff6b6b; }
.tag.asm { background: rgba(78, 205, 196, 0.15); color: #4ecdc4; }
.tag.hook { background: rgba(162, 155, 254, 0.15); color: #a29bfe; }
.tag.STYLE { background: rgba(253, 121, 168, 0.15); color: #fd79a8; }

/* ===== Pond / personal-instruction page ===== */
.pond-page {
  overflow: hidden;
  background: #061a24;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
}
#pondCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
}
.pond-title {
  position: fixed;
  top: 1.8rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  color: rgba(180, 230, 255, 0.6);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-shadow: 0 2px 12px rgba(0,0,0,0.5);
  pointer-events: none;
}
.leaf {
  position: fixed;
  z-index: 3;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.leaf-visual {
  width: 130px;
  height: 115px;
  border-radius: 48% 52% 50% 50% / 55% 50% 50% 45%;
  background: radial-gradient(ellipse at 40% 35%, #6aad50, #2d5a27);
  box-shadow: 0 8px 30px rgba(0,0,0,0.4), inset 0 -8px 20px rgba(0,0,0,0.25), inset 0 8px 20px rgba(120, 200, 80, 0.15);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
  position: relative;
  transform-origin: center center;
}
.leaf-visual::before {
  content: "";
  position: absolute;
  top: 50%;
  left: -6px;
  width: 18px;
  height: 28px;
  background: #061a24;
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  transform: translateY(-50%);
}
.leaf-visual::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 60%;
  height: 60%;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, rgba(100, 180, 70, 0.3), transparent 70%);
  border-radius: 50%;
}
.leaf-label {
  color: rgba(180, 230, 200, 0.85);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-shadow: 0 2px 8px rgba(0,0,0,0.6);
  background: rgba(6, 26, 36, 0.5);
  padding: 0.25rem 0.8rem;
  border-radius: 999px;
  backdrop-filter: blur(4px);
}
.leaf:hover .leaf-visual {
  transform: scale(1.08);
  box-shadow: 0 8px 40px rgba(90, 180, 60, 0.3), inset 0 -8px 20px rgba(0,0,0,0.2);
}
.leaf.active .leaf-visual {
  transform: scale(1.15);
  box-shadow: 0 0 50px rgba(100, 220, 150, 0.5), inset 0 -8px 20px rgba(0,0,0,0.2);
}

/* Content overlay */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
}
.overlay.open { display: flex; }
.content-card {
  background: linear-gradient(160deg, rgba(12, 40, 50, 0.96), rgba(6, 26, 36, 0.98));
  border: 1px solid rgba(100, 200, 255, 0.2);
  border-radius: 1.5rem;
  padding: 2.5rem;
  max-width: 520px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 24px 60px rgba(0,0,0,0.5), 0 0 40px rgba(100, 200, 150, 0.08);
  position: relative;
  animation: cardIn 0.4s ease;
}
@keyframes cardIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.content-card h2 {
  color: #88ddbb;
  font-size: 1.6rem;
  margin: 0 0 1rem;
}
.content-card p {
  color: rgba(200, 230, 255, 0.88);
  line-height: 1.8;
  margin: 0.6rem 0;
}
.content-card blockquote {
  border-left: 3px solid #88ddbb;
  padding: 0.6rem 1rem;
  margin: 1rem 0;
  color: #b0e8cc;
  font-style: italic;
  font-size: 1.05rem;
  background: rgba(100, 200, 150, 0.06);
  border-radius: 0 0.5rem 0.5rem 0;
}
.close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  color: rgba(200,230,255,0.7);
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 0.2s;
}
.close-btn:hover {
  background: rgba(255,80,80,0.2);
  border-color: rgba(255,80,80,0.3);
  color: #ff6b6b;
}

/* Hobby grid */
.hobby-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.4rem 0.8rem;
  margin: 0.8rem 0;
}
.hobby-grid span {
  color: rgba(200, 230, 255, 0.85);
  font-size: 0.92rem;
  padding: 0.3rem 0.5rem;
  background: rgba(100, 200, 150, 0.06);
  border-radius: 0.4rem;
}
.hobby-note {
  margin-top: 1rem !important;
  padding-top: 0.8rem;
  border-top: 1px solid rgba(100, 200, 150, 0.15);
  color: #88ddbb !important;
  font-weight: 500;
}

/* Tech list */
.tech-list {
  list-style: none;
  padding: 0;
  margin: 0.8rem 0;
}
.tech-list li {
  color: rgba(200, 230, 255, 0.85);
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(100, 200, 150, 0.1);
  font-size: 0.95rem;
}
.tech-list li:last-child { border-bottom: none; }
.tech-list li strong {
  color: #88ddbb;
  font-weight: 600;
}

/* Pond footer */
.pond-footer {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
}
.pond-footer a {
  color: rgba(180, 220, 255, 0.5);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  background: rgba(0,0,0,0.3);
  backdrop-filter: blur(4px);
  transition: 0.25s;
}
.pond-footer a:hover {
  color: rgba(180, 220, 255, 0.9);
  background: rgba(0,0,0,0.5);
}

/* Lotus burst */
.lotus-burst {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  pointer-events: none;
  z-index: 4;
}
.lotus-burst.active {
  animation: lotusExplode 0.8s ease-out forwards;
}
@keyframes lotusExplode {
  0% { width: 0; height: 0; opacity: 1; }
  40% { width: 200px; height: 200px; opacity: 0.8; }
  100% { width: 300px; height: 300px; opacity: 0; }
}
.lotus-petal {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 70px;
  border-radius: 50% 50% 30% 30%;
  background: radial-gradient(ellipse at 50% 30%, #ffb8d0, #e8709a);
  transform-origin: bottom center;
  opacity: 0;
}
.lotus-burst.active .lotus-petal {
  animation: petalOut 0.7s ease forwards;
}
.lotus-burst.active .lotus-petal:nth-child(1) { transform: translate(-50%, -100%) rotate(0deg); animation-delay: 0s; }
.lotus-burst.active .lotus-petal:nth-child(2) { transform: translate(-50%, -100%) rotate(45deg); animation-delay: 0.05s; }
.lotus-burst.active .lotus-petal:nth-child(3) { transform: translate(-50%, -100%) rotate(90deg); animation-delay: 0.1s; }
.lotus-burst.active .lotus-petal:nth-child(4) { transform: translate(-50%, -100%) rotate(135deg); animation-delay: 0.15s; }
.lotus-burst.active .lotus-petal:nth-child(5) { transform: translate(-50%, -100%) rotate(180deg); animation-delay: 0.2s; }
.lotus-burst.active .lotus-petal:nth-child(6) { transform: translate(-50%, -100%) rotate(225deg); animation-delay: 0.25s; }
.lotus-burst.active .lotus-petal:nth-child(7) { transform: translate(-50%, -100%) rotate(270deg); animation-delay: 0.3s; }
.lotus-burst.active .lotus-petal:nth-child(8) { transform: translate(-50%, -100%) rotate(315deg); animation-delay: 0.35s; }

@keyframes petalOut {
  0% { opacity: 0; transform: translate(-50%, -100%) rotate(var(--r, 0deg)) scale(0); }
  30% { opacity: 1; transform: translate(-50%, -100%) rotate(var(--r, 0deg)) scale(1.3); }
  70% { opacity: 0.8; transform: translate(-50%, -120%) rotate(var(--r, 0deg)) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -150%) rotate(var(--r, 0deg)) scale(0.5); }
}

/* Mobile */
@media (max-width: 640px) {
  .leaf-visual { width: 100px; height: 90px; }
  .leaf-label { font-size: 0.8rem; }
  .content-card { padding: 1.5rem; }
  .hobby-grid { grid-template-columns: repeat(2, 1fr); }
}