:root {
  --bg: #eef1ff;
  --panel: #ffffff;
  --ink: #1b1735;
  --muted: #595479;
  --line: #d7d2ff;
  --line-strong: #a99ffc;
  --accent: #2b2268;
  --brand: #6d4dff;
  --brand-soft: #ece8ff;
  --brand-2: #ff4fa3;
  --brand-3: #31c48d;
  --brand-4: #4aa8ff;
  --ok: #2b7a2b;
  --shadow: 0 16px 36px rgba(59, 30, 154, 0.17);
  --surface-soft: #f8f7ff;
  --surface-soft-2: #f1eeff;
  --progress-track-bg: #e8e5ff;
  --status-done-bg: #def8ef;
  --status-done-ink: #177751;
  --status-pending-bg: #ffe3ef;
  --status-pending-ink: #a60f59;
  --danger: #d04848;
  --on-brand: #ffffff;
  --body-glow-a: rgba(109, 77, 255, 0.34);
  --body-glow-b: rgba(74, 168, 255, 0.3);
  --body-glow-c: rgba(255, 79, 163, 0.22);
  --body-grad-a: #f5f3ff;
  --body-grad-b: #eef9ff;
  --body-grad-c: #fff3fa;
}

:root[data-theme="dark"] {
  --bg: #0d1020;
  --panel: #151a33;
  --ink: #eff0ff;
  --muted: #b8b8d9;
  --line: #30355e;
  --line-strong: #5b5f96;
  --accent: #f0f3ff;
  --brand: #9f75ff;
  --brand-soft: #231f47;
  --brand-2: #ff6fb5;
  --brand-3: #3bd39e;
  --brand-4: #58b2ff;
  --ok: #8de3ac;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  --surface-soft: #1a1f3d;
  --surface-soft-2: #212851;
  --progress-track-bg: #2c3266;
  --status-done-bg: #1a4938;
  --status-done-ink: #94efb9;
  --status-pending-bg: #5a2745;
  --status-pending-ink: #ffaad3;
  --danger: #ff9bcb;
  --on-brand: #ffffff;
  --body-glow-a: rgba(159, 117, 255, 0.28);
  --body-glow-b: rgba(88, 178, 255, 0.24);
  --body-glow-c: rgba(255, 111, 181, 0.18);
  --body-grad-a: #0b0f1d;
  --body-grad-b: #101534;
  --body-grad-c: #1d1433;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Trebuchet MS", Tahoma, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 10%, var(--body-glow-a), transparent 42%),
    radial-gradient(circle at 90% 0%, var(--body-glow-b), transparent 45%),
    radial-gradient(circle at 28% 86%, var(--body-glow-c), transparent 44%),
    linear-gradient(140deg, var(--body-grad-a) 0%, var(--body-grad-b) 48%, var(--body-grad-c) 100%);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  width: min(44vw, 500px);
  height: min(44vw, 500px);
  border-radius: 999px;
  filter: blur(46px);
  z-index: -1;
  opacity: 0.5;
  pointer-events: none;
}

body::before {
  top: -140px;
  left: -120px;
  background: color-mix(in srgb, var(--brand) 68%, transparent);
  animation: float-glow-a 14s ease-in-out infinite alternate;
}

body::after {
  right: -140px;
  bottom: -160px;
  background: color-mix(in srgb, var(--brand-2) 60%, transparent);
  animation: float-glow-b 17s ease-in-out infinite alternate;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 18px 56px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background:
    linear-gradient(
      95deg,
      color-mix(in srgb, var(--brand) 14%, transparent) 0%,
      color-mix(in srgb, var(--brand-4) 10%, transparent) 56%,
      color-mix(in srgb, var(--brand-2) 14%, transparent) 100%
    ),
    color-mix(in srgb, var(--panel) 66%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 74%, transparent);
  box-shadow: 0 10px 30px color-mix(in srgb, var(--brand) 12%, transparent);
}

.site-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 18px;
}

.site-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.site-brand-logo {
  width: 34px;
  height: 34px;
}

.site-brand-text {
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.2px;
  background: linear-gradient(90deg, var(--brand) 0%, var(--brand-2) 55%, var(--brand-4) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.site-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
}

.site-nav-link {
  text-decoration: none;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 6px 12px;
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.1px;
  transition: color 160ms ease, background-color 160ms ease, transform 160ms ease;
}

.site-nav-link:hover {
  color: var(--ink);
  background: color-mix(in srgb, var(--panel) 72%, transparent);
  transform: translateY(-1px);
}

.site-nav-link.is-active {
  color: var(--ink);
  background:
    linear-gradient(
      120deg,
      color-mix(in srgb, var(--brand-soft) 72%, var(--panel)) 0%,
      color-mix(in srgb, var(--brand-soft) 50%, var(--panel)) 100%
    );
  border-color: transparent;
  box-shadow: inset 0 2px 10px color-mix(in srgb, var(--brand) 16%, transparent);
}

.site-footer-link {
  text-decoration: none;
  color: var(--muted);
  border: 1px solid color-mix(in srgb, var(--line) 72%, transparent);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.85rem;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.site-footer-link:hover {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(120deg, var(--brand) 0%, var(--brand-2) 100%);
  transform: translateY(-1px);
}

.site-footer-link.is-active {
  color: #fff;
  background: linear-gradient(120deg, var(--brand) 0%, var(--brand-2) 52%, var(--brand-4) 100%);
  border-color: transparent;
}

.site-nav-dropdown {
  position: relative;
}

.site-nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 210px;
  display: grid;
  gap: 4px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 130ms ease, transform 130ms ease, visibility 130ms ease;
  z-index: 40;
}

.site-nav-dropdown:hover .site-nav-dropdown-menu,
.site-nav-dropdown:focus-within .site-nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.site-nav-dropdown-link {
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 7px 9px;
  font-size: 0.84rem;
}

.site-nav-dropdown-link:hover,
.site-nav-dropdown-link.is-active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(120deg, var(--brand) 0%, var(--brand-2) 100%);
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 28px;
  background:
    linear-gradient(120deg, color-mix(in srgb, var(--brand) 12%, var(--panel)) 0%, color-mix(in srgb, var(--brand-4) 8%, var(--panel)) 45%, color-mix(in srgb, var(--brand-2) 12%, var(--panel)) 100%);
  box-shadow: 0 -10px 30px color-mix(in srgb, var(--brand) 14%, transparent);
}

.site-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 18px;
  display: grid;
  gap: 12px;
}

.site-footer-top {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

.site-footer-title {
  font-size: 1.06rem;
  margin: 0;
}

.site-footer-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--brand-2) 44%, transparent);
  background: color-mix(in srgb, var(--brand-2) 18%, transparent);
  color: var(--ink);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 10px;
}

.site-footer-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.site-footer-meta {
  margin: 2px 0 0;
  font-size: 0.84rem;
  color: var(--muted);
}

.header-card {
  background:
    linear-gradient(140deg, color-mix(in srgb, var(--brand) 7%, var(--panel)) 0%, color-mix(in srgb, var(--brand-2) 5%, var(--panel)) 65%, color-mix(in srgb, var(--brand-4) 7%, var(--panel)) 100%);
  border: 1px solid var(--line);
  border-top: 4px solid color-mix(in srgb, var(--brand) 70%, var(--brand-2));
  box-shadow: var(--shadow);
  border-radius: 18px;
  padding: 22px 20px;
  margin-bottom: 20px;
  animation: reveal-up 360ms ease both;
}

.brand-banner {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(120deg, var(--brand) 0%, var(--brand-2) 50%, var(--brand-4) 100%);
  background-size: 180% 180%;
  color: #fff;
  border-radius: 16px;
  padding: 12px 14px;
  box-shadow: 0 14px 30px color-mix(in srgb, var(--brand) 36%, transparent);
  margin-bottom: 14px;
  animation: gradient-shift 10s ease-in-out infinite alternate;
}

.brand-logo {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.32);
  flex-shrink: 0;
}

.brand-title {
  margin: 0;
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-content {
  flex: 1;
  min-width: 0;
}

.brand-subtitle {
  margin: 3px 0 0;
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.88);
}

.theme-toggle-btn {
  border: 1px solid rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 0.84rem;
  white-space: nowrap;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease;
}

.theme-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.24);
  border-color: rgba(255, 255, 255, 0.82);
  transform: translateY(-1px);
}

h1,
h2,
h3 {
  margin: 0;
}

.page-title {
  font-size: clamp(1.4rem, 2.3vw, 2rem);
  letter-spacing: 0.2px;
}

.subtitle {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.96rem;
}

.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.nav-card {
  display: block;
  text-decoration: none;
  color: var(--ink);
  background: linear-gradient(180deg, color-mix(in srgb, var(--panel) 92%, var(--brand-4)) 0%, color-mix(in srgb, var(--surface-soft) 88%, var(--brand-2)) 100%);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.nav-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--brand) 55%, var(--line));
  box-shadow: 0 14px 28px color-mix(in srgb, var(--brand) 20%, transparent);
  background: linear-gradient(180deg, color-mix(in srgb, var(--panel) 86%, var(--brand-4)) 0%, color-mix(in srgb, var(--surface-soft) 82%, var(--brand-2)) 100%);
}

.pdf-spotlight {
  margin-top: 16px;
  border-color: color-mix(in srgb, var(--brand) 56%, var(--line));
  background: linear-gradient(135deg, color-mix(in srgb, var(--panel) 75%, var(--brand-4)) 0%, color-mix(in srgb, var(--surface-soft) 70%, var(--brand-2)) 100%);
  box-shadow: 0 14px 28px color-mix(in srgb, var(--brand) 24%, transparent);
}

.pdf-spotlight:hover {
  transform: translateY(-5px) scale(1.01);
}

.nav-card-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.tool-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.tool-tag.hot {
  color: #fff;
  background: linear-gradient(120deg, #ff7a18 0%, #ff3d9a 100%);
  box-shadow: 0 0 0 1px color-mix(in srgb, #ff7a18 60%, transparent), 0 0 16px color-mix(in srgb, #ff3d9a 52%, transparent);
  animation: hot-badge-pulse 1.6s ease-in-out infinite;
}

.nav-card.pdf-tool-hot {
  position: relative;
  border-color: color-mix(in srgb, var(--brand-2) 65%, var(--line));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--brand-2) 22%, transparent), 0 12px 24px color-mix(in srgb, var(--brand-2) 18%, transparent);
}

.nav-card.pdf-tool-hot::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: 0 0 16px color-mix(in srgb, var(--brand-2) 42%, transparent), 0 0 28px color-mix(in srgb, var(--brand-4) 26%, transparent);
  opacity: 0.55;
  animation: hot-card-glow 1.8s ease-in-out infinite alternate;
}

.nav-card.pdf-tool-hot:hover {
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--brand-2) 28%, transparent), 0 14px 28px color-mix(in srgb, var(--brand-2) 26%, transparent);
}

.nav-card,
.stat-card,
.subject-progress-item,
.tracker-chapter,
.slide-card {
  animation: reveal-up 420ms ease both;
}

.nav-card:nth-child(2),
.stat-card:nth-child(2) {
  animation-delay: 50ms;
}

.nav-card:nth-child(3),
.stat-card:nth-child(3) {
  animation-delay: 90ms;
}

.nav-card:nth-child(4),
.stat-card:nth-child(4) {
  animation-delay: 120ms;
}

.content-prose {
  margin-top: 16px;
  display: grid;
  gap: 14px;
}

.content-prose section {
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.content-prose h2 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.content-prose p,
.content-prose li {
  color: var(--muted);
  line-height: 1.6;
}

.content-prose ul {
  margin: 0;
  padding-left: 18px;
}

.pdf-showcase {
  margin-top: 10px;
}

.pdf-showcase-note {
  margin: 0;
  color: var(--muted);
}

.pdf-showcase-grid {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 10px;
}

.pdf-showcase-card {
  margin: 0;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  display: grid;
  gap: 8px;
}

.pdf-showcase-card img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.pdf-showcase-card figcaption {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

@keyframes reveal-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes gradient-shift {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 100% 50%;
  }
}

@keyframes float-glow-a {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(34px, 24px) scale(1.08);
  }
}

@keyframes float-glow-b {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(-36px, -26px) scale(1.1);
  }
}

@keyframes hot-badge-pulse {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 0 0 1px color-mix(in srgb, #ff7a18 58%, transparent), 0 0 14px color-mix(in srgb, #ff3d9a 45%, transparent);
  }
  50% {
    transform: scale(1.06);
    box-shadow: 0 0 0 1px color-mix(in srgb, #ff7a18 72%, transparent), 0 0 22px color-mix(in srgb, #ff3d9a 58%, transparent);
  }
}

@keyframes hot-card-glow {
  from {
    opacity: 0.42;
    box-shadow: 0 0 10px color-mix(in srgb, var(--brand-2) 34%, transparent), 0 0 20px color-mix(in srgb, var(--brand-4) 20%, transparent);
  }
  to {
    opacity: 0.9;
    box-shadow: 0 0 22px color-mix(in srgb, var(--brand-2) 56%, transparent), 0 0 38px color-mix(in srgb, var(--brand-4) 34%, transparent);
  }
}

.nav-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.nav-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
}

.feature-logo {
  display: inline-block;
  margin-right: 6px;
}

.top-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.pill-link,
button,
input,
select {
  font: inherit;
}

.pill-link,
button {
  border: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--panel) 92%, var(--brand-4));
  color: var(--ink);
  border-radius: 10px;
  padding: 8px 12px;
  text-decoration: none;
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.pill-link:hover,
button:hover {
  background: color-mix(in srgb, var(--surface-soft) 86%, var(--brand-2));
  border-color: color-mix(in srgb, var(--brand) 48%, var(--line-strong));
  transform: translateY(-1px);
}

button.primary {
  background: linear-gradient(120deg, var(--brand) 0%, var(--brand-2) 58%, var(--brand-4) 100%);
  color: #fff;
  border-color: transparent;
}

button.primary:hover {
  background: linear-gradient(120deg, color-mix(in srgb, var(--brand) 90%, #000) 0%, color-mix(in srgb, var(--brand-2) 90%, #000) 58%, color-mix(in srgb, var(--brand-4) 90%, #000) 100%);
}

.control-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 16px;
}

.control-bar input {
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 8px 10px;
  min-width: 180px;
  background: var(--panel);
  color: var(--ink);
}

.control-bar select {
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 8px 10px;
  min-width: 220px;
  background: var(--panel);
  color: var(--ink);
}

.table-wrap {
  margin-top: 16px;
  overflow: auto;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: var(--panel);
  --table-scroll-min-width: 1100px;
}

.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  min-width: 100%;
  table-layout: fixed;
}

.table-wrap:has(table tr > :nth-child(n+11)) table {
  table-layout: auto;
  min-width: var(--table-scroll-min-width);
}

@supports not selector(.table-wrap:has(table tr > :nth-child(n+11))) {
  .table-wrap table {
    table-layout: auto;
    min-width: var(--table-scroll-min-width);
  }
}

th,
td {
  border: 1px solid var(--line);
  padding: 9px 8px;
  vertical-align: top;
  overflow-wrap: normal;
  word-break: normal;
}

th {
  background: var(--surface-soft-2);
  text-align: left;
  position: sticky;
  top: 0;
  z-index: 1;
}

th:first-child,
td:first-child {
  width: 72px;
}

th:nth-child(2),
td:nth-child(2) {
  min-width: 240px;
}

.chapter-cell {
  cursor: text;
}

.header-cell,
.chapter-editor {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.editable-label {
  flex: 1;
  min-width: 40px;
}

.hover-actions {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 120ms ease;
}

th:hover .hover-actions,
.chapter-cell:hover .hover-actions {
  opacity: 1;
  pointer-events: auto;
}

.inline-icon-btn {
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: var(--surface-soft);
  color: var(--ink);
  padding: 2px 7px;
  min-height: 24px;
  min-width: 24px;
  line-height: 1;
  cursor: pointer;
}

.inline-icon-btn.danger {
  color: #ef4444;
  border-color: color-mix(in srgb, #ef4444 30%, var(--line-strong));
}

.drag-handle {
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--muted);
  cursor: grab;
  user-select: none;
}

.draggable-header,
.draggable-row {
  cursor: grab;
}

.is-drag-over {
  outline: 2px dashed color-mix(in srgb, var(--brand) 65%, transparent);
  outline-offset: -2px;
}

.add-end-cell,
.end-spacer-cell,
.add-end-row td {
  text-align: center;
}

.add-end-btn {
  font-weight: 600;
}

.checkbox-cell {
  text-align: center;
  vertical-align: middle;
}

.checkbox-cell input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--ok);
  cursor: pointer;
}

.badge {
  display: inline-block;
  margin-top: 10px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  color: var(--muted);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.8rem;
}

small.helper {
  display: block;
  color: var(--muted);
  margin-top: 6px;
}

.footer-note {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.9rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.stat-card {
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}

.stat-card h3 {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 6px;
}

.stat-value {
  font-size: 1.1rem;
  font-weight: 700;
}

.subject-progress-list {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.subject-progress-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 10px;
}

.subject-progress-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 7px;
  font-size: 0.92rem;
}

.progress-track {
  background: var(--progress-track-bg);
  border-radius: 99px;
  overflow: hidden;
  height: 9px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--brand), var(--brand-2), var(--brand-4));
  transition: width 260ms ease;
}

.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px;
  margin-top: 8px;
}

.form-grid input,
.form-grid select {
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 8px 10px;
  background: var(--panel);
  color: var(--ink);
}

.delete-row-btn {
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
  background: var(--surface-soft);
  cursor: pointer;
}

.section-heading {
  margin-top: 18px;
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.lecture-tracker-host {
  margin-top: 18px;
}

.tracker-chapter {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
  margin-top: 10px;
  padding: 8px 10px;
}

.tracker-chapter summary {
  cursor: pointer;
  font-weight: 600;
  padding: 6px 2px;
}

.tracker-control {
  margin-bottom: 8px;
}

.tracker-chapter input[type="text"] {
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 7px 9px;
  width: 100%;
  min-width: 120px;
}

.tracker-chapter select {
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 6px 8px;
  background: var(--panel);
  color: var(--ink);
  min-width: 92px;
}

.tracker-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.note-preview {
  display: inline-block;
  max-width: 260px;
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-cell {
  white-space: nowrap;
}

.status-done-tick {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  margin-left: 6px;
  border-radius: 999px;
  background: var(--surface-soft-2);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  opacity: 0;
  transform: scale(0.85);
  transition: opacity 150ms ease, transform 150ms ease;
}

.status-done-tick.is-done {
  background: var(--status-done-bg);
  color: var(--status-done-ink);
}

.status-done-tick.is-pending {
  background: var(--status-pending-bg);
  color: var(--status-pending-ink);
}

.status-done-tick.is-visible {
  opacity: 1;
  transform: scale(1);
}

.subject-progress-details summary {
  cursor: pointer;
  list-style: none;
}

.subject-progress-details summary::-webkit-details-marker {
  display: none;
}

.subject-progress-details .progress-track {
  margin-top: 8px;
}

.chapter-progress-list {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

.tool-grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 10px;
}

.tool-grid label {
  display: grid;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--muted);
}

.tool-grid input,
.tool-grid select {
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 8px 10px;
  background: var(--panel);
  color: var(--ink);
}

.tool-grid textarea {
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 8px 10px;
  background: var(--panel);
  color: var(--ink);
  resize: vertical;
  min-height: 120px;
}

.checkbox-inline {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-weight: 500;
}

.layout-preview-panel {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: var(--surface-soft);
  display: grid;
  gap: 8px;
}

.layout-preview-grid {
  --layout-preview-cols: 2;
  display: grid;
  grid-template-columns: repeat(var(--layout-preview-cols), minmax(0, 1fr));
  gap: 6px;
}

.layout-preview-cell {
  border: 1px solid color-mix(in srgb, var(--brand) 45%, var(--line));
  border-radius: 8px;
  background: color-mix(in srgb, var(--brand) 10%, var(--panel));
  color: var(--ink);
  font-weight: 700;
  font-size: 0.8rem;
  min-height: 26px;
  display: grid;
  place-items: center;
}

.setting-block {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
  padding: 8px 10px;
  display: grid;
  gap: 8px;
}

.setting-block.checkbox-inline {
  display: flex;
  align-items: center;
}

.setting-block select {
  min-width: 0;
}

.upload-dropzone {
  margin-top: 12px;
  border: 2px dashed var(--line-strong);
  border-radius: 14px;
  padding: 18px 14px;
  background: var(--surface-soft);
  text-align: center;
  transition: border-color 150ms ease, background 150ms ease;
}

.upload-dropzone.is-dragging {
  border-color: var(--brand);
  background: var(--brand-soft);
}

.slide-preview-grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(165px, 1fr));
  gap: 10px;
}

.slide-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px;
  background: var(--panel);
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}

.slide-card:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
}

.slide-card.is-selected {
  border-color: var(--brand);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--brand) 25%, transparent);
}

.slide-card-head {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 8px;
}

.slide-thumb {
  width: 100%;
  height: 140px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

:root[data-theme="dark"] .slide-thumb {
  background: #fff;
}

.slide-meta {
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--muted);
}

.progress-inline {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}

.progress-inline .progress-track {
  flex: 1;
  height: 12px;
}

.progress-inline .progress-fill {
  width: 0;
}

.fullscreen-progress-overlay {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: color-mix(in srgb, #070714 60%, transparent);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 180ms ease, visibility 180ms ease;
}

.fullscreen-progress-overlay.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
}

.fullscreen-progress-card {
  width: min(560px, 100%);
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  box-shadow: var(--shadow);
  padding: 16px;
}

.fullscreen-progress-title {
  display: block;
  margin-bottom: 10px;
  font-size: 1rem;
}

.fullscreen-progress-card .progress-track {
  height: 12px;
}

.fullscreen-progress-card .progress-fill {
  width: 0;
}

.fullscreen-progress-meta {
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.pdf-progress-overlay {
  background:
    radial-gradient(circle at 20% 16%, color-mix(in srgb, var(--brand) 30%, transparent), transparent 38%),
    radial-gradient(circle at 80% 78%, color-mix(in srgb, var(--brand-2) 30%, transparent), transparent 42%),
    color-mix(in srgb, #05050f 66%, transparent);
}

.pdf-progress-card {
  position: relative;
  overflow: hidden;
}

.pdf-progress-card::before {
  content: "";
  position: absolute;
  inset: -120% auto auto -40%;
  width: 220px;
  height: 220px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--brand) 28%, transparent);
  filter: blur(16px);
  animation: pdf-progress-glow 2.8s ease-in-out infinite alternate;
  pointer-events: none;
}

.pdf-progress-orb {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2), var(--brand-4));
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--brand) 48%, transparent);
  margin-bottom: 10px;
  animation: pdf-progress-pulse 1.35s ease-out infinite;
}

.pdf-progress-card .progress-fill {
  position: relative;
}

.pdf-progress-card .progress-fill::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.62) 50%, transparent 100%);
  transform: translateX(-100%);
  animation: pdf-progress-sheen 1.1s linear infinite;
}

@keyframes pdf-progress-pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--brand) 45%, transparent); }
  70% { box-shadow: 0 0 0 12px color-mix(in srgb, var(--brand) 0%, transparent); }
  100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--brand) 0%, transparent); }
}

@keyframes pdf-progress-sheen {
  to { transform: translateX(100%); }
}

@keyframes pdf-progress-glow {
  0% { transform: translate3d(0, 0, 0) scale(1); opacity: 0.5; }
  100% { transform: translate3d(46px, 30px, 0) scale(1.22); opacity: 0.82; }
}

.error-text {
  color: var(--danger);
}

.todo-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.todo-item {
  display: grid;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
  padding: 8px 10px;
}

.todo-item-main {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
}

.todo-item-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.todo-item span.is-done {
  text-decoration: line-through;
  color: var(--muted);
}

.todo-sublist {
  border-top: 1px dashed var(--line);
  padding-top: 8px;
}

.todo-sublist-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  display: grid;
  gap: 6px;
}

.todo-subitem {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 8px;
}

.todo-subitem span.is-done {
  text-decoration: line-through;
  color: var(--muted);
}

.todo-subempty {
  color: var(--muted);
  font-size: 0.92rem;
}

.todo-subform {
  margin-top: 8px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}

.todo-subform input {
  min-width: 0;
}

.todo-empty {
  border: 1px dashed var(--line-strong);
  border-radius: 10px;
  background: var(--surface-soft);
  padding: 9px 10px;
  color: var(--muted);
}

.tools-feature-grid .nav-card {
  padding: 12px;
}

.tool-embed-frame {
  width: 100%;
  min-height: 760px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  margin-top: 8px;
}

.coming-soon-banner {
  border-color: color-mix(in srgb, var(--brand-2) 55%, var(--line)) !important;
  background: linear-gradient(120deg, color-mix(in srgb, var(--brand-2) 15%, var(--surface-soft)) 0%, color-mix(in srgb, var(--brand-4) 14%, var(--surface-soft)) 100%) !important;
}

.danger-btn {
  border-color: color-mix(in srgb, var(--danger) 55%, var(--line-strong));
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 10%, var(--panel));
}

.danger-btn:hover {
  border-color: color-mix(in srgb, var(--danger) 75%, var(--line-strong));
  background: color-mix(in srgb, var(--danger) 18%, var(--panel));
}

.study-subject-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
}

.study-subject-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
}

.study-subject-title {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.study-subject-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.study-material-list {
  display: grid;
  gap: 8px;
}

.study-material-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: var(--panel);
}

.study-material-body {
  margin-top: 6px;
  display: grid;
  gap: 8px;
}

.study-file-preview {
  width: 100%;
  max-height: 180px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}

.pomodoro-shell {
  text-align: center;
}

.focus-modes {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 14px;
}

.focus-modes button.is-active {
  background: linear-gradient(120deg, var(--brand) 0%, var(--brand-2) 100%);
  color: var(--on-brand);
  border-color: transparent;
}

.pomodoro-orb-wrap {
  margin: 20px auto 8px;
  width: min(280px, 84vw);
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  position: relative;
}

.pomodoro-orb {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 25%, color-mix(in srgb, #fff 40%, transparent), transparent 45%), linear-gradient(140deg, var(--brand), var(--brand-2), var(--brand-4));
  filter: drop-shadow(0 16px 30px color-mix(in srgb, var(--brand) 35%, transparent));
  animation: orb-float 3.8s ease-in-out infinite;
}

.focus-timer {
  position: relative;
  z-index: 1;
  font-size: clamp(2rem, 8vw, 3rem);
  font-weight: 700;
  color: var(--on-brand);
  text-shadow: 0 6px 18px rgba(0, 0, 0, 0.22);
}

.focus-timer.is-running {
  animation: pulse-timer 1s ease-in-out infinite;
}

@keyframes orb-float {
  0% { transform: translateY(0px) scale(1); }
  50% { transform: translateY(-8px) scale(1.02); }
  100% { transform: translateY(0px) scale(1); }
}

@keyframes pulse-timer {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.04); }
}

.filters-grid {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px;
}

.filters-grid input,
.filters-grid select {
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 8px 10px;
  background: var(--panel);
  color: var(--ink);
}

@media (max-width: 720px) {
  .site-header-inner {
    display: grid;
    justify-content: stretch;
    padding: 10px;
  }

  .site-nav {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    justify-content: flex-start;
    gap: 6px;
  }

  .site-nav > * {
    width: 100%;
  }

  .site-nav-link {
    display: block;
    text-align: center;
  }

  .site-nav-dropdown-menu {
    right: auto;
    left: 0;
    min-width: min(82vw, 260px);
  }

  .app-shell {
    padding: 14px 10px 40px;
  }

  .header-card {
    border-radius: 14px;
    padding: 16px 14px;
  }

  .control-bar {
    align-items: stretch;
  }

  .control-bar > * {
    width: 100%;
    min-width: 0;
  }

  .control-bar input,
  .control-bar select,
  .control-bar button,
  .control-bar .pill-link {
    min-width: 100%;
  }

  .tool-grid,
  .form-grid,
  .filters-grid {
    grid-template-columns: 1fr;
  }

  .pdf-showcase-grid,
  .slide-preview-grid {
    grid-template-columns: 1fr;
  }

  .study-subject-head,
  .subject-progress-head,
  .site-footer-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .study-subject-actions {
    width: 100%;
  }

  .study-subject-actions > * {
    width: 100%;
  }

  .note-preview {
    max-width: 100%;
    white-space: normal;
  }

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

  .brand-banner {
    flex-wrap: wrap;
    align-items: flex-start;
  }

  .theme-toggle-btn {
    margin-top: 2px;
  }

  .slide-thumb {
    height: 160px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}