*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #FFFEF2;
  --surface: #F7F6EE;
  --surface-2: #EEEDE5;
  --text: #070707;
  --text-secondary: #5c5854;
  --text-muted: #a09c96;
  --border: #E8E6DA;
  --border-hover: #D0CEC2;
  --accent: #0A0A0B;
  --accent-dim: rgba(10, 10, 11, 0.06);
  --radius: 10px;
  --max-width: 860px;

  --floppy-body: #E8E5D8;
  --floppy-body-dark: #D6D3C6;
  --floppy-shutter: #C8C5B8;
  --floppy-slot: #B0ADA0;
  --floppy-label: #F5F3E8;
  --floppy-label-border: #D6D3C6;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 3px;
  border-radius: 4px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ─── Daily Fact Strip ─── */

.fact-strip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-secondary);
  opacity: 0;
  transform: translateY(-100%);
  transition: opacity 0.4s, transform 0.4s;
}
.fact-strip.visible {
  opacity: 1;
  transform: translateY(0);
}

.fact-label {
  flex-shrink: 0;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  background: var(--surface-2);
  padding: 2px 8px;
  border-radius: 3px;
}

.fact-text {
  flex: 1;
  min-width: 0;
}

.fact-source {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px dashed var(--border);
  transition: color 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.fact-source:hover {
  color: var(--text);
  border-color: var(--text);
}

.fact-close {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  padding: 0 2px;
  transition: color 0.2s;
}
.fact-close:hover { color: var(--text); }

@media (max-width: 640px) {
  .fact-strip {
    flex-wrap: wrap;
    gap: 6px 10px;
    padding: 10px 16px;
    font-size: 12px;
  }
  .fact-source { order: 4; }
  .fact-close { order: 5; margin-left: auto; }
}

/* ─── Hero (minimal) ─── */

.hero {
  min-height: 42vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 24px 36px;
  text-align: center;
}

.hero-name {
  font-family: 'Inter', sans-serif;
  font-size: clamp(42px, 7vw, 64px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 16px;
  color: var(--text);
  opacity: 0;
  transform: translateY(20px);
  animation: heroIn 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.1s forwards;
}

.hero-bio {
  font-size: 15px;
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 22px;
  letter-spacing: 0.005em;
  line-height: 1.7;
  max-width: 460px;
  opacity: 0;
  transform: translateY(16px);
  animation: heroIn 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.25s forwards;
}

@keyframes heroIn {
  to { opacity: 1; transform: translateY(0); }
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  opacity: 0;
  transform: translateY(12px);
  animation: heroIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.4s forwards;
}

.hero-links a {
  font-size: 12px;
  color: var(--text-secondary);
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 100px;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  letter-spacing: 0.02em;
}

.hero-links a:hover {
  color: var(--text);
  border-color: var(--border-hover);
  background: var(--surface);
}

/* ─── Must Visits Floating Widget ─── */

.mv-float {
  position: fixed;
  top: 72px;
  right: 20px;
  z-index: 900;
}

.mv-fab {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.25s;
}
.mv-fab svg { width: 18px; height: 18px; }
.mv-fab:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 18px rgba(0,0,0,0.22);
}
.mv-fab.hidden {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.8);
  position: absolute;
}

.mv-panel {
  width: 300px;
  max-height: 420px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 36px rgba(0,0,0,0.14);
  opacity: 0;
  transform: translateY(-8px) scale(0.96);
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  flex-direction: column;
}
.mv-panel.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.mv-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.mv-panel-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.mv-panel-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.2s;
}
.mv-panel-close:hover { color: var(--text); }

.mv-panel-list {
  overflow-y: auto;
  padding: 6px 0;
  flex: 1;
}
.mv-panel-list::-webkit-scrollbar { width: 4px; }
.mv-panel-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.mv-item {
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  transition: background 0.15s;
  border-bottom: 1px solid var(--border);
}
.mv-item:last-child { border-bottom: none; }
.mv-item:hover { background: var(--surface); }

.mv-name {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 1px;
}
.mv-desc {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

@media (max-width: 400px) {
  .mv-panel { width: calc(100vw - 40px); }
}

/* ─── Spotify Floating Player ─── */

.sp-float {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 900;
}

.sp-fab {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #1DB954;
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 12px rgba(29, 185, 84, 0.3);
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.25s;
}
.sp-fab:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 20px rgba(29, 185, 84, 0.4);
}
.sp-fab.hidden {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.8);
  position: absolute;
}
.sp-fab svg { width: 22px; height: 22px; }

.sp-player {
  width: 300px;
  background: #1A1A1E;
  border-radius: 12px;
  padding: 10px 12px 12px;
  box-shadow: 0 6px 32px rgba(0, 0, 0, 0.35);
  opacity: 0;
  transform: translateY(-8px) scale(0.96);
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  position: absolute;
  top: 0;
  right: 0;
}
.sp-player.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.sp-player-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  margin-bottom: 8px;
}

.sp-shuffle-btn {
  background: none;
  border: none;
  color: #666;
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: color 0.2s, background 0.2s;
}
.sp-shuffle-btn svg { width: 16px; height: 16px; }
.sp-shuffle-btn:hover {
  color: #1DB954;
  background: rgba(29, 185, 84, 0.1);
}

.sp-close-btn {
  background: none;
  border: none;
  color: #666;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: color 0.2s;
}
.sp-close-btn:hover { color: #fff; }

.sp-player-embed {
  border-radius: 8px;
  overflow: hidden;
}

@media (max-width: 400px) {
  .sp-player { width: calc(100vw - 40px); }
}

/* ─── Floppy Grid ─── */

.floppy-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 60px;
}

.floppy-section-label {
  text-align: center;
  font-size: 14px;
  font-weight: 400;
  color: var(--text-muted);
  margin-bottom: 32px;
  letter-spacing: 0.01em;
  opacity: 0;
  transform: translateY(10px);
  animation: heroIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) 0.55s forwards;
}

.floppy-row {
  display: flex;
  justify-content: center;
  gap: 28px;
  margin-bottom: 12px;
}

/* ─── Floppy Disk (3D) ─── */

.floppy {
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 170px;
  flex-shrink: 0;
  perspective: 600px;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.floppy:hover {
  transform: translateY(-8px);
}

.floppy.open {
  transform: translateY(-3px);
}

.floppy-disk {
  width: 100%;
  max-width: 190px;
  aspect-ratio: 1 / 1.03;
  position: relative;
  transform-style: preserve-3d;
  transform: rotateX(8deg) rotateY(-4deg);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              filter 0.35s ease;
  filter: drop-shadow(2px 6px 10px rgba(0,0,0,0.10))
          drop-shadow(0 2px 4px rgba(0,0,0,0.06));
}

.floppy-disk::before,
.floppy-disk::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 8px;
  background: var(--floppy-body);
  border: 1px solid var(--floppy-body-dark);
  transform-style: preserve-3d;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.35s ease,
              box-shadow 0.35s ease;
  z-index: -1;
  pointer-events: none;
}

.floppy-disk::before {
  background: #DDD9CC;
  border-color: #CCC8BB;
  transform: translateZ(-4px) translate(3px, 3px);
  opacity: 0.5;
  box-shadow: 1px 2px 6px rgba(0,0,0,0.06);
}

.floppy-disk::after {
  background: #E2DFCF;
  border-color: #D3D0C3;
  transform: translateZ(-2px) translate(1.5px, 1.5px);
  opacity: 0.65;
  box-shadow: 1px 1px 4px rgba(0,0,0,0.05);
}

.floppy:hover .floppy-disk {
  transform: rotateX(6deg) rotateY(-2deg) scale(1.03);
  filter: drop-shadow(3px 12px 24px rgba(0,0,0,0.14))
          drop-shadow(0 4px 8px rgba(0,0,0,0.08));
}

.floppy:hover .floppy-disk::before {
  transform: translateZ(-6px) translate(8px, 10px) rotateZ(2.5deg);
  opacity: 0.85;
  box-shadow: 2px 4px 12px rgba(0,0,0,0.09);
}

.floppy:hover .floppy-disk::after {
  transform: translateZ(-3px) translate(4px, 5px) rotateZ(1deg);
  opacity: 0.9;
  box-shadow: 1px 3px 8px rgba(0,0,0,0.07);
}

.floppy:active .floppy-disk {
  transform: rotateX(10deg) rotateY(-3deg) scale(0.97);
  transition-duration: 0.1s;
}

.floppy:active .floppy-disk::before {
  transform: translateZ(-4px) translate(4px, 4px) rotateZ(1deg);
  transition-duration: 0.1s;
}

.floppy:active .floppy-disk::after {
  transform: translateZ(-2px) translate(2px, 2px) rotateZ(0.5deg);
  transition-duration: 0.1s;
}

.floppy.open .floppy-disk {
  transform: rotateX(6deg) rotateY(-3deg) scale(1.01);
  filter: drop-shadow(2px 8px 18px rgba(0,0,0,0.12))
          drop-shadow(0 3px 6px rgba(0,0,0,0.07));
}

.floppy.open .floppy-disk::before {
  transform: translateZ(-6px) translate(7px, 9px) rotateZ(2deg);
  opacity: 0.8;
}

.floppy.open .floppy-disk::after {
  transform: translateZ(-3px) translate(3.5px, 4.5px) rotateZ(0.8deg);
  opacity: 0.85;
}

.floppy-disk svg {
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  position: relative;
  z-index: 1;
}

.floppy-count {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 10px;
  text-align: center;
  letter-spacing: 0.01em;
}

/* ─── Folder Content (accordion) ─── */

.folder-wrapper {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.5s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.35s ease,
              margin 0.4s ease;
  margin: 0;
}

.folder-wrapper.expanded {
  opacity: 1;
  margin: 8px 0 16px;
  overflow: visible;
}

.folder-content {
  padding: 28px 0 12px;
  border-top: 1px solid var(--border);
}

.folder-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.folder-title {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 28px;
  font-weight: 500;
  font-style: italic;
  color: var(--text);
  letter-spacing: -0.02em;
}

.folder-close {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  line-height: 1;
}

.folder-close:hover {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.folder-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  letter-spacing: 0.01em;
}

/* ─── File Cards (Deepdives) ─── */

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.card {
  --file-accent: var(--text-muted);
  display: block;
  padding: 18px 22px 16px 22px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--file-accent);
  border-radius: 0;
  background: #FFFFFF;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
  position: relative;
  overflow: hidden;
}

/* Dog-ear fold */
.card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 20px; height: 20px;
  background: linear-gradient(225deg, var(--bg) 50%, var(--surface-2) 50%);
  box-shadow: -1px 1px 1px rgba(0, 0, 0, 0.03);
  z-index: 2;
  transition: width 0.3s ease, height 0.3s ease;
}

.card:hover {
  border-color: var(--border-hover);
  border-left-color: var(--file-accent);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.card:hover::before {
  width: 26px;
  height: 26px;
}

/* Category color coding */
.card[data-cat="voice-ai"]  { --file-accent: #993025; }
.card[data-cat="infra"]     { --file-accent: #1a4a7a; }
.card[data-cat="ecomm"]     { --file-accent: #1e6b3c; }
.card[data-cat="fintech"]   { --file-accent: #2a7a5c; }
.card[data-cat="agents"]    { --file-accent: #5a2080; }
.card[data-cat="design"]    { --file-accent: #6b3fa0; }

.card-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--file-accent);
  padding: 0;
  border: none;
  background: none;
}

/* Tiny file icon before tag */
.card-tag::before {
  content: '';
  display: inline-block;
  width: 10px; height: 13px;
  border: 1.2px solid var(--file-accent);
  border-radius: 1px;
  background: linear-gradient(225deg, transparent 3px, white 3px);
  opacity: 0.7;
  flex-shrink: 0;
}

.card h3 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
  margin-top: 8px;
  line-height: 1.3;
  color: var(--text);
  position: relative;
  z-index: 1;
}

.card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.card-date {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  font-weight: 400;
  position: relative;
  z-index: 1;
}

/* ─── Blog List (file entries) ─── */

.blog-list {
  display: flex;
  flex-direction: column;
}

.blog-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 8px;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  transition: padding-left 0.2s, background 0.2s;
  margin: 0 -8px;
}

.blog-item:first-child {
  border-top: 1px solid var(--border);
}

.blog-item:hover {
  padding-left: 16px;
  background: var(--surface);
}

/* File icon for blog entries */
.blog-item::before {
  content: '';
  display: block;
  width: 16px; height: 20px;
  min-width: 16px;
  border: 1.2px solid var(--border-hover);
  border-radius: 1px;
  background:
    linear-gradient(225deg, var(--surface-2) 5px, white 5px);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  transition: border-color 0.2s;
}

.blog-item:hover::before {
  border-color: var(--text-muted);
}

.blog-date {
  font-size: 11px;
  color: var(--text-muted);
  min-width: 100px;
  flex-shrink: 0;
  letter-spacing: 0.03em;
  font-variant-numeric: tabular-nums;
}

.blog-item h3 {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  flex: 1;
  color: var(--text);
  transition: color 0.2s;
}

.blog-arrow {
  font-size: 12px;
  color: var(--text-muted);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.2s, transform 0.2s, color 0.2s;
  flex-shrink: 0;
}

.blog-item:hover .blog-arrow {
  opacity: 1;
  transform: translateX(0);
  color: var(--text);
}

/* ─── Knowledge Card (Fintech) ─── */

.knowledge-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.knowledge-card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.knowledge-header {
  margin-bottom: 14px;
}

.knowledge-theme {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  background: var(--accent-dim);
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid var(--border);
}

.knowledge-card h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--text);
}

.knowledge-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.knowledge-tags span {
  font-size: 12px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 100px;
  letter-spacing: 0.01em;
}

/* ─── Reading List ─── */

.reading-list-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-top: 28px;
  margin-bottom: 0;
}

.reading-list {
  border-top: 1px solid var(--border);
  margin-top: 12px;
}

.reading-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.15s;
}

.reading-item:hover {
  padding-left: 6px;
}

.reading-item::before {
  content: '';
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
  margin-top: 7px;
  transition: background 0.15s;
}

.reading-item:hover::before {
  background: var(--text);
}

.reading-title {
  font-size: 13px;
  color: var(--text-secondary);
  flex: 1;
  line-height: 1.5;
  transition: color 0.15s;
}

.reading-item:hover .reading-title {
  color: var(--text);
}

.reading-ext {
  font-size: 12px;
  color: var(--text-muted);
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
  flex-shrink: 0;
}

.reading-item:hover .reading-ext {
  opacity: 1;
  color: var(--text);
}

/* ─── Thesis Cards (flat, no carousel) ─── */

.thesis-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.thesis-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
  position: relative;
  overflow: hidden;
}

.thesis-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.thesis-number {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 72px;
  font-weight: 500;
  color: rgba(0, 0, 0, 0.03);
  position: absolute;
  top: -12px;
  right: 8px;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.thesis-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.thesis-theme {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  background: var(--accent-dim);
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid var(--border);
}

.thesis-arrow {
  font-size: 14px;
  color: var(--text-muted);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.2s, transform 0.2s;
}

.thesis-card:hover .thesis-arrow {
  opacity: 1;
  transform: translateX(0);
}

.thesis-card h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
  line-height: 1.3;
  color: var(--text);
}

.thesis-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.72;
  margin-bottom: 16px;
  flex: 1;
}

.thesis-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.thesis-tags span {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.02em;
}

/* ─── Agent Experience Banner ─── */

.ax-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #EDEBE3;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.ax-banner:hover {
  border-color: var(--border-hover);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}
.ax-banner-left {
  display: flex;
  align-items: center;
  gap: 14px;
}
.ax-banner-badge {
  flex-shrink: 0;
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #fff;
  background: #5a2080;
  padding: 3px 10px;
  border-radius: 100px;
}
.ax-banner-title {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 17px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 2px;
}
.ax-banner-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.ax-banner-arrow {
  font-size: 18px;
  color: var(--text-muted);
  flex-shrink: 0;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.2s, transform 0.2s, color 0.2s;
}
.ax-banner:hover .ax-banner-arrow {
  opacity: 1;
  transform: translateX(0);
  color: var(--text);
}

@media (max-width: 520px) {
  .ax-banner { flex-direction: column; align-items: flex-start; }
  .ax-banner-arrow { display: none; }
}

/* ─── Topic List (AI/ML + Maths) ─── */

.topic-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
}

.topic-list li {
  font-size: 14px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  transition: border-color 0.2s, background 0.2s, color 0.2s, box-shadow 0.2s, transform 0.2s;
  overflow: hidden;
}

.topic-list li:hover {
  border-color: var(--border-hover);
  background: var(--surface-2);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.06);
  color: var(--text);
  transform: translateY(-1px);
}

.topic-list li a,
.topic-list li > span {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 13px 16px;
  color: inherit;
}

.topic-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.topic-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

.topic-list li:hover .topic-subtitle {
  color: var(--text-secondary);
}

.phase-label {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-top: 28px;
  margin-bottom: 14px;
}

.phase-label .phase-name {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
}

.phase-label .phase-tag {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* ─── Stagger animation on folder open ─── */

.folder-wrapper .card,
.folder-wrapper .thesis-card,
.folder-wrapper .blog-item,
.folder-wrapper .knowledge-card,
.folder-wrapper .topic-list li,
.folder-wrapper .nomad-showcase {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.25s, background 0.25s, box-shadow 0.25s;
}

.folder-wrapper.expanded .card,
.folder-wrapper.expanded .thesis-card,
.folder-wrapper.expanded .blog-item,
.folder-wrapper.expanded .knowledge-card,
.folder-wrapper.expanded .topic-list li,
.folder-wrapper.expanded .nomad-showcase {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Shutter slide on open ─── */

.floppy-shutter {
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  transform-origin: center top;
}

.floppy.open .floppy-shutter {
  transform: translateY(-6px);
}

/* ─── Study Plan Toggle ─── */

.study-plan-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 14px 18px;
  margin-top: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  font-family: 'Newsreader', Georgia, serif;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  transition: background 0.2s, border-color 0.2s;
}

.study-plan-toggle:hover {
  background: var(--surface-2);
  border-color: var(--border-hover);
}

.study-plan-arrow {
  font-family: 'Inter', sans-serif;
  font-size: 18px;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  line-height: 1;
}

.study-plan-toggle[aria-expanded="true"] .study-plan-arrow {
  transform: rotate(45deg);
}

.study-plan-collapsible {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.3s ease;
}

.study-plan-collapsible.open {
  max-height: 60vh;
  opacity: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.study-plan-collapsible.open::-webkit-scrollbar {
  width: 5px;
}

.study-plan-collapsible.open::-webkit-scrollbar-track {
  background: transparent;
}

.study-plan-collapsible.open::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.study-plan-collapsible.open::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ─── Back to Top ─── */

.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.3s, transform 0.3s, background 0.2s, color 0.2s, border-color 0.2s;
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

/* ─── Footer ─── */

footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 36px;
  border-top: 1px solid var(--border);
  text-align: center;
}

footer p {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ─── Animations ─── */

.fade-in {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.55s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-stagger {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: var(--stagger-delay, 0ms);
}

.animate-stagger.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Responsive ─── */

@media (max-width: 768px) {
  .floppy-row {
    gap: 20px;
  }

  .floppy {
    width: 140px;
  }

  .hero h1 {
    font-size: 38px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .blog-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .blog-item::before {
    display: none;
  }

  .blog-date {
    min-width: unset;
  }

  .blog-arrow {
    display: none;
  }

  .topic-list {
    grid-template-columns: 1fr;
  }

  .thesis-grid {
    grid-template-columns: 1fr;
  }

  .folder-title {
    font-size: 24px;
  }
}

@media (max-width: 520px) {
  .floppy-row {
    flex-wrap: wrap;
    gap: 16px;
  }

  .floppy {
    width: 120px;
  }

  .floppy-count {
    font-size: 10px;
  }

  .hero {
    padding: 60px 20px 28px;
  }

  .floppy-section {
    padding: 0 16px 40px;
  }
}

/* ─── AI Chat Widget ─── */

.chat-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 800;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.3s;
}
.chat-fab-icon { width: 24px; height: 24px; }
.chat-fab:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 28px rgba(0,0,0,0.3);
}
.chat-fab.hidden {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.7);
}
.chat-fab-ping {
  position: absolute;
  top: -2px;
  right: -2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #e25c3d;
  border: 2.5px solid var(--bg);
  animation: chatPing 2s infinite;
}
@keyframes chatPing {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}

.chat-window {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 850;
  width: 380px;
  height: 520px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 16px 56px rgba(0,0,0,0.18), 0 0 0 1px rgba(0,0,0,0.03);
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(20px) scale(0.93);
  pointer-events: none;
  transition: opacity 0.35s cubic-bezier(0.16,1,0.3,1), transform 0.35s cubic-bezier(0.16,1,0.3,1);
}
.chat-window.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--surface);
  border-radius: 16px 16px 0 0;
}
.chat-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}
.chat-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  position: relative;
}
.chat-online {
  position: absolute;
  bottom: -1px;
  right: -1px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #4CAF50;
  border: 2px solid var(--surface);
}
.chat-header-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.chat-header-status {
  font-size: 11px;
  color: var(--text-muted);
  transition: color 0.3s;
}
.chat-header-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}
.chat-header-close:hover { color: var(--text); background: var(--accent-dim); }

.chat-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
}
.chat-body::-webkit-scrollbar { width: 4px; }
.chat-body::-webkit-scrollbar-track { background: transparent; }
.chat-body::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.chat-msg { display: flex; }
.chat-msg.bot { justify-content: flex-start; }
.chat-msg.user { justify-content: flex-end; }

.chat-animate {
  animation: chatSlideIn 0.35s cubic-bezier(0.16,1,0.3,1) both;
}
@keyframes chatSlideIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.chat-bubble {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
}
.chat-msg.bot .chat-bubble {
  background: var(--surface);
  border-bottom-left-radius: 4px;
}
.chat-msg.user .chat-bubble {
  background: var(--text);
  color: var(--bg);
  border-bottom-right-radius: 4px;
}

.chat-bubble a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--border-hover);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.2s;
}
.chat-bubble a:hover { text-decoration-color: var(--text); }
.chat-msg.bot .chat-bubble a { font-weight: 500; }

.chat-link-card {
  display: block;
  margin-top: 8px;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.chat-link-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  text-decoration: none;
}
.chat-link-card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}
.chat-link-card-desc {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

.chat-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 4px;
}
.chat-chip {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 5px 14px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.chat-chip:hover {
  background: var(--surface);
  border-color: var(--border-hover);
  color: var(--text);
}

.chat-typing {
  display: inline-flex;
  gap: 5px;
  padding: 12px 16px;
  background: var(--surface);
  border-radius: 14px;
  border-bottom-left-radius: 4px;
}
.chat-typing span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: chatDot 1.4s infinite ease-in-out;
}
.chat-typing span:nth-child(2) { animation-delay: 0.2s; }
.chat-typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes chatDot {
  0%, 70%, 100% { opacity: 0.25; transform: translateY(0); }
  35% { opacity: 1; transform: translateY(-4px); }
}

.chat-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--bg);
  border-radius: 0 0 16px 16px;
}
.chat-input {
  flex: 1;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.chat-input::placeholder { color: var(--text-muted); }
.chat-input:focus {
  border-color: var(--text);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.chat-send {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--text);
  color: var(--bg);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: opacity 0.2s, transform 0.15s;
}
.chat-send svg { width: 16px; height: 16px; }
.chat-send:hover { opacity: 0.85; }
.chat-send:active { transform: scale(0.93); }

.chat-extra {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 6px;
  line-height: 1.5;
  padding: 8px 12px;
  background: var(--bg);
  border-left: 2px solid var(--border);
  border-radius: 0 6px 6px 0;
}

@media (max-width: 440px) {
  .chat-window {
    right: 8px;
    left: 8px;
    bottom: 8px;
    width: auto;
    height: calc(100dvh - 16px);
    border-radius: 14px;
  }
  .chat-header { border-radius: 14px 14px 0 0; }
  .chat-input-row { border-radius: 0 0 14px 14px; }
}

/* ─── Nomad Design Showcase ─── */

.nomad-showcase {
  margin-top: 20px;
}

.nomad-showcase-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
}

.nomad-showcase-title {
  font-family: 'Newsreader', serif;
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.nomad-showcase-meta {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.nomad-showcase-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 24px;
  max-width: 480px;
}

.nomad-phone-row {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding-bottom: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  -webkit-overflow-scrolling: touch;
}

.nomad-phone-row::-webkit-scrollbar {
  height: 4px;
}

.nomad-phone-row::-webkit-scrollbar-track {
  background: transparent;
}

.nomad-phone-row::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.nomad-phone-item {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.nomad-phone-frame {
  position: relative;
  width: 160px;
  height: 320px;
  border-radius: 24px;
  border: 4px solid var(--text);
  background: var(--text);
  overflow: hidden;
  box-shadow: 0 12px 40px -8px rgba(0, 0, 0, 0.18);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.4s ease;
}

.nomad-phone-item:hover .nomad-phone-frame {
  transform: translateY(-4px);
  box-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.24);
}

.nomad-phone-notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 16px;
  background: var(--text);
  border-radius: 0 0 10px 10px;
  z-index: 10;
}

.nomad-phone-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 20px;
  pointer-events: none;
}

.nomad-phone-label {
  font-family: 'Newsreader', serif;
  font-size: 14px;
  font-weight: 500;
}

.nomad-phone-sublabel {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-top: -4px;
}

@media (max-width: 600px) {
  .nomad-phone-frame {
    width: 140px;
    height: 280px;
    border-radius: 20px;
    border-width: 3px;
  }
  .nomad-phone-notch {
    width: 48px;
    height: 14px;
  }
  .nomad-phone-frame iframe {
    border-radius: 17px;
  }
  .nomad-phone-row {
    gap: 14px;
  }
}