:root {
  --bg: #f4fbfa;
  --panel: #eaf6f4;
  --border: rgba(18, 92, 88, 0.14);

  --text: #0f3f3b;
  --muted: #5f8f8a;

  --p1: #e0f3ef;
  --p2: #c7ebe5;
  --p3: #f0fbf9;
  --p4: #d6f1ec;

  --accent: #1fb6a6;
  --accent-soft: rgba(31, 182, 166, 0.22);
  --accent-glow: rgba(31, 182, 166, 0.55);

  --code-bg: #dbf1ee;

  --radius: 18px;
  --radius-sm: 10px;

  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);

  --fast: 0.2s;
  --med: 0.5s;
  --slow: 2.8s;

  /* calm by default */
  --storm: 0.1;

  --shadow-lg:
    0 40px 120px rgba(20, 120, 110, 0.22),
    0 8px 24px rgba(10, 60, 55, 0.12);

  --palm-icon: url("data:image/svg+xml;utf8,\
<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64'>\
<path d='M32 8c-8 6-12 14-12 22 6-4 12-6 18-6-2-8-4-12-6-16z' fill='%231fb6a6'/>\
<path d='M32 8c8 6 12 14 12 22-6-4-12-6-18-6 2-8 4-12 6-16z' fill='%233fe0cf'/>\
<rect x='30' y='28' width='4' height='26' rx='2' fill='%230f5f57'/>\
</svg>");

  --icon-file: url("data:image/svg+xml;utf8,\
<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%2334cfc0'>\
<path d='M6 2h7l5 5v15a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2z'/>\
</svg>");

  --icon-folder: url("data:image/svg+xml;utf8,\
<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%2334cfc0'>\
<path d='M3 6a2 2 0 0 1 2-2h5l2 2h7a2 2 0 0 1 2 2v10a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V6z'/>\
</svg>");
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #020b12;
    --panel: #061821;
    --border: rgba(120, 220, 220, 0.12);

    --text: #e6fbff;
    --muted: #7bb7c0;

    --p1: #04131b;
    --p2: #06202a;
    --p3: #020b12;
    --p4: #082a33;

    --accent: #46ffe8;
    --accent-soft: rgba(70, 255, 232, 0.22);
    --accent-glow: rgba(70, 255, 232, 0.6);

    --code-bg: #051c25;

    /* night breeze */
    --storm: 0.7;

    --shadow-lg:
      0 60px 220px rgba(0, 0, 0, 0.95),
      0 0 120px rgba(70, 255, 232, 0.18);

    --palm-icon: url("data:image/svg+xml;utf8,\
<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64'>\
<path d='M32 8c-8 6-12 14-12 22 6-4 12-6 18-6-2-8-4-12-6-16z' fill='%2334ffd2'/>\
<path d='M32 8c8 6 12 14 12 22-6-4-12-6-18-6 2-8 4-12 6-16z' fill='%236affea'/>\
<rect x='30' y='28' width='4' height='26' rx='2' fill='%23003333'/>\
</svg>");
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 2rem;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1000px 600px at 15% -10%, var(--p2), transparent 60%),
    radial-gradient(800px 500px at 85% 0%, var(--p4), transparent 65%),
    var(--bg);
}

.container {
  max-width: 900px;
  margin: auto;
  position: relative;
  background: linear-gradient(
    180deg,
    rgba(255,255,255,0.75),
    rgba(255,255,255,0.35)
  );
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  backdrop-filter: blur(18px);
}

.container::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      45deg,
      rgba(31,182,166,0.045) 0 1px,
      transparent 1px 26px
    ),
    repeating-linear-gradient(
      -45deg,
      rgba(31,182,166,0.045) 0 1px,
      transparent 1px 26px
    );
  opacity: 0.35;
  pointer-events: none;
}

@media (prefers-color-scheme: dark) {
  .container {
    background: linear-gradient(
      180deg,
      rgba(6,24,33,0.94),
      rgba(2,11,18,0.94)
    );
  }

  .container::before {
    opacity: 0.14;
  }

  /* star reflections on water */
  .container::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
      radial-gradient(1px 1px at 12% 78%, rgba(255,255,255,0.5), transparent),
      radial-gradient(1px 1px at 28% 82%, rgba(255,255,255,0.4), transparent),
      radial-gradient(1px 1px at 46% 76%, rgba(255,255,255,0.45), transparent),
      radial-gradient(1px 1px at 63% 80%, rgba(255,255,255,0.35), transparent),
      radial-gradient(1px 1px at 82% 77%, rgba(255,255,255,0.4), transparent);
    animation: water-stars 18s linear infinite;
    opacity: 0.35;
    pointer-events: none;
  }
}

header {
  text-align: center;
  padding: 3rem 2rem 2.2rem;
  position: relative;
}

header::after {
  content: var(--palm-icon);
  display: block;
  margin: 0.8rem auto 0;
  width: 26px;
  height: 26px;
  opacity: 0.7;
  animation: sway calc(6s - var(--storm) * 2s) ease-in-out infinite;
}

header h1 {
  margin: 0;
  font-size: 2.2rem;
  letter-spacing: 0.28em;
  background: linear-gradient(
    90deg,
    var(--accent),
    #b9fff4,
    #6de8d8,
    var(--accent)
  );
  background-size: 300%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradient-flow 8s linear infinite;
}

@keyframes gradient-flow {
  from { background-position: 0%; }
  to { background-position: 300%; }
}

@keyframes water-stars {
  from { transform: translateX(0); }
  to { transform: translateX(-40px); }
}

.tagline {
  margin-top: 0.6rem;
  color: var(--muted);
  font-style: italic;
  animation: fade-up var(--med) var(--ease-spring);
}

main,
.about,
.buttons,
article,
.category {
  padding: 2.6rem;
}

.about {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(
      120deg,
      var(--accent-soft),
      transparent 60%
    );
}

.date {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.markdown {
  animation: fade-up var(--med) var(--ease-spring);
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.markdown h1,
.markdown h2,
.markdown h3 {
  position: relative;
}

.markdown h2::before {
  content: var(--palm-icon);
  position: absolute;
  left: -1.8rem;
  width: 20px;
  height: 20px;
  opacity: 0.6;
  animation: sway calc(7s - var(--storm) * 2s) ease-in-out infinite;
}

.markdown p { margin: 0.85rem 0; }

.markdown blockquote {
  margin: 1.8rem 0;
  padding: 1.3rem 1.6rem;
  border-radius: var(--radius-sm);
  font-family: ui-serif, Georgia, "Times New Roman", serif;
  font-style: italic;
  position: relative;
  background:
    linear-gradient(
      135deg,
      var(--p4),
      var(--p2)
    );
}

.markdown blockquote::before {
  content: var(--palm-icon);
  position: absolute;
  top: -0.8rem;
  left: 1.2rem;
  width: 22px;
  height: 22px;
  opacity: 0.65;
  animation: sway calc(6.5s - var(--storm) * 2s) ease-in-out infinite;
}

.markdown code {
  background: var(--code-bg);
  padding: 0.25rem 0.45rem;
  border-radius: 6px;
  font-family: ui-monospace, monospace;
}

.markdown pre {
  background: var(--code-bg);
  padding: 1.4rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

.markdown img {
  max-width: 100%;
  display: block;
  margin: 1rem auto;
}

.markdown img.emoji {
  display: inline-block;
  width: 1.15em;
  height: 1.15em;
  vertical-align: -0.2em;
  margin: 0 0.06em;
  object-fit: contain;
}

.markdown .signature {
  display: block;
  margin-top: 1.6rem;
  text-align: left;
  font-weight: bold;
  font-style: italic;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-shadow: 0 0 10px var(--accent-soft);
}

a {
  color: var(--accent);
  text-decoration: none;
  position: relative;
}

a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, currentColor, transparent);
  transform: scaleX(0);
  transition: transform var(--med) var(--ease-spring);
}

a:hover::after {
  transform: scaleX(1);
}

.tree {
  margin-top: 1.6rem;
  font-family: ui-monospace, monospace;
}

.tree-folder {
  margin-top: 1.2rem;
  font-weight: bold;
}

.tree-file {
  margin-left: 1.8rem;
  padding: 0.4rem 0.6rem;
  border-radius: 8px;
  transition:
    transform var(--fast) var(--ease-spring),
    background var(--fast) var(--ease-spring);
}

.tree-file:hover {
  transform: translateX(6px);
  background: var(--accent-soft);
}

.tree-date {
  font-size: 0.75rem;
  color: var(--muted);
  margin-left: 0.5rem;
}

.tree img {
  width: 16px;
  height: 16px;
  margin-right: 6px;
  vertical-align: middle;
  content: var(--icon-file);
}

.tree-folder img {
  content: var(--icon-folder);
}

.buttons {
  text-align: center;
}

.buttons img {
  width: 88px;
  height: 31px;
  margin: 8px;
  border-radius: 6px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
  transition:
    transform var(--fast) var(--ease-spring),
    box-shadow var(--fast) var(--ease-spring);
}

.buttons a:hover img {
  transform: translateY(-6px) scale(1.05);
  box-shadow: 0 20px 50px rgba(0,0,0,0.35);
}

footer {
  text-align: center;
  padding: 1.4rem;
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

@keyframes sway {
  0%, 100% {
    transform: rotate(calc(-3deg - var(--storm) * 2deg));
  }
  50% {
    transform: rotate(calc(5deg + var(--storm) * 3deg));
  }
}

@media (max-width: 768px) {
  body { padding: 1rem; }
  header h1 { font-size: 1.6rem; }
  main, .about, article, .category { padding: 1.4rem; }
}

@media (max-width: 768px) {
  .markdown h1::before,
  .markdown h2::before,
  .markdown h3::before {
    position: relative;
    left: auto;
    display: block;
    margin: 0 auto 0.4rem;
    text-align: center;
    opacity: 0.45;
    animation-duration: 9s;
    transform: scale(0.85);
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}