:root {
  --bg-color: #0b1220;
  --bg-alt: #101b2d;
  --panel: rgba(15, 23, 42, 0.8);
  --panel-strong: #111d30;
  --surface: rgba(148, 163, 184, 0.08);
  --surface-border: rgba(148, 163, 184, 0.2);
  --text: #e6eef8;
  --muted: #a7b7ce;
  --primary: #7bd5ff;
  --primary-strong: #2ea4ff;
  --accent: #9d7bff;
  --success: #67db9d;
  --shadow: 0 22px 60px rgba(2, 6, 23, 0.42);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(123, 213, 255, 0.12), transparent 30%),
    radial-gradient(circle at bottom right, rgba(157, 123, 255, 0.14), transparent 28%),
    var(--bg-color);
  color: var(--text);
}

img {
  max-width: 100%;
  display: block;
}

a,
button,
input,
select {
  font: inherit;
}

button,
select,
input {
  border-radius: 12px;
}

.page-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px 72px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 20px 18px;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--surface-border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #071421;
  font-weight: 800;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.7rem;
  font-weight: 700;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: 1.25rem;
}

.top-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.top-links a {
  text-decoration: none;
  color: var(--muted);
  transition: color 0.2s ease;
}

.top-links a:hover,
.top-links a:focus-visible {
  color: var(--text);
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 26px;
  align-items: center;
  padding: 48px 0 28px;
}

.hero-copy h2 {
  margin-bottom: 16px;
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -0.06em;
}

.hero-copy p {
  max-width: 640px;
  color: var(--muted);
  line-height: 1.7;
  font-size: 1.06rem;
}

.hero-actions,
.submit-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.primary-btn,
.secondary-btn,
.ghost-btn,
.pdf-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.primary-btn,
.secondary-btn,
.ghost-btn {
  padding: 12px 18px;
}

.primary-btn {
  background: linear-gradient(135deg, var(--primary), #a8eeff);
  color: #071421;
}

.secondary-btn {
  background: rgba(148, 163, 184, 0.08);
  border: 1px solid var(--surface-border);
  color: var(--text);
}

.ghost-btn {
  background: transparent;
  border: 1px solid var(--surface-border);
  color: var(--muted);
  cursor: pointer;
}

.primary-btn:hover,
.primary-btn:focus-visible,
.secondary-btn:hover,
.secondary-btn:focus-visible,
.ghost-btn:hover,
.ghost-btn:focus-visible,
.pdf-link:hover,
.pdf-link:focus-visible {
  transform: translateY(-1px);
}

.hero-panel,
.filters-panel,
.submit-panel,
.guide-card,
.pdf-card {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.8), rgba(17, 24, 39, 0.92));
  border: 1px solid var(--surface-border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 22px;
}

.panel-header {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(110px, 1fr));
  gap: 16px;
}

.stats div {
  padding: 16px 14px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 18px;
}

.stats strong {
  display: block;
  font-size: 1.7rem;
  margin-bottom: 5px;
}

.stats span {
  color: var(--muted);
  font-size: 0.8rem;
}

.filters-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 28px;
  padding: 20px;
}

.search-box {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.search-box label,
.filter-row label,
.mini-label {
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 600;
}

#searchInput,
#categorySelect,
#tagSelect,
#sortSelect {
  width: 100%;
  background: rgba(15, 23, 42, 0.82);
  border: 1px solid var(--surface-border);
  color: var(--text);
  padding: 12px 14px;
  outline: none;
}

#searchInput:focus,
#categorySelect:focus,
#tagSelect:focus,
#sortSelect:focus {
  border-color: rgba(123, 213, 255, 0.7);
  box-shadow: 0 0 0 4px rgba(123, 213, 255, 0.08);
}

.filter-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(140px, 1fr));
  gap: 14px;
}

.toolbar-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-chip {
  padding: 8px 12px;
  border: 1px solid var(--surface-border);
  background: rgba(148, 163, 184, 0.05);
  color: var(--muted);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-chip.is-active {
  background: rgba(123, 213, 255, 0.09);
  border-color: rgba(123, 213, 255, 0.4);
  color: var(--text);
}

.library-section,
.guide-section {
  margin-top: 14px;
}

.section-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.section-header h3 {
  font-size: clamp(1.8rem, 2.5vw, 2.4rem);
  margin-bottom: 0;
}

.result-summary {
  color: var(--muted);
  margin-bottom: 0;
}

.pdf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.pdf-card {
  display: flex;
  flex-direction: column;
  min-height: 310px;
  padding: 22px;
}

.pdf-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.pdf-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(123, 213, 255, 0.18), rgba(157, 123, 255, 0.22));
  border: 1px solid rgba(123, 213, 255, 0.26);
  color: var(--primary);
  font-weight: 800;
  letter-spacing: 0.05em;
}

.document-category {
  color: var(--primary);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  color: var(--muted);
  font-size: 0.72rem;
  margin-bottom: 12px;
}

.pdf-title {
  font-size: 1.32rem;
  margin-bottom: 10px;
  line-height: 1.35;
}

.pdf-description {
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 18px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
  margin-bottom: 18px;
}

.tag-list span {
  display: inline-flex;
  align-items: center;
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.08);
  border: 1px solid rgba(148, 163, 184, 0.18);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
}

.card-actions {
  margin-top: auto;
}

.pdf-link {
  width: 100%;
  background: linear-gradient(135deg, var(--primary), #b0f0ff);
  color: #071421;
  padding: 12px 14px;
}

.pdf-link[aria-disabled="true"] {
  pointer-events: none;
  opacity: 0.42;
  filter: grayscale(0.35);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.guide-card {
  padding: 22px;
}

.guide-card span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: rgba(123, 213, 255, 0.12);
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 14px;
}

.guide-card h4 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.guide-card p {
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 0;
}

.submit-panel {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  margin-top: 34px;
  padding: 26px 22px;
}

.submit-copy p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.7;
  max-width: 680px;
}

.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 260px;
  text-align: center;
  padding: 36px 18px;
  color: var(--muted);
}

.empty-state h4 {
  font-size: 1.5rem;
  color: var(--text);
  margin-bottom: 8px;
}

@media (max-width: 820px) {
  .topbar,
  .submit-panel,
  .toolbar-row,
  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .filter-row {
    grid-template-columns: 1fr;
  }

  .top-links {
    flex-wrap: wrap;
  }
}