:root {
  --ink: #1B2A4A;
  --paper: #FAF7F0;
  --paper-raised: #FFFFFF;
  --kraft: #8B6F4E;
  --stamp-red: #B0433D;
  --ledger-green: #3F6B4F;
  --slate: #6B7280;
  --line: #E4DDCB;
  --display: 'Zilla Slab', Georgia, serif;
  --body: 'Inter', -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', monospace;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  -webkit-font-smoothing: antialiased;
}

body {
  padding-bottom: calc(24px + var(--safe-bottom));
}

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

/* Auth gate (full screen) */
:root {
  --gate-bg: #EAF6F0;
  --gate-ink: #0B2B22;
  --gate-teal-900: #0F3D31;
  --gate-teal-700: #12664F;
  --gate-teal-600: #1B8266;
  --gate-line: #CFE8DE;
}
.auth-gate {
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--gate-bg);
  padding: calc(16px + var(--safe-top)) 20px calc(24px + var(--safe-bottom));
}
.gate-topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 380px;
  margin: 0 auto 28px;
}
.gate-back {
  color: var(--gate-teal-700);
  text-decoration: none;
  font-size: 20px;
  line-height: 1;
}
.gate-brand {
  font-weight: 700;
  color: var(--gate-teal-900);
  font-size: 17px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.gate-brand-pill {
  background: #DCF0E7;
  color: var(--gate-teal-700);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border-radius: 999px;
}
.gate-header {
  max-width: 380px;
  margin: 0 auto;
  text-align: center;
}
.gate-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px; height: 64px;
  background: var(--gate-teal-700);
  border-radius: 18px;
  margin-bottom: 18px;
  box-shadow: 0 8px 20px rgba(18,102,79,0.25);
}
.gate-title { font-family: var(--body); font-weight: 700; font-size: 26px; margin: 0 0 8px; color: var(--gate-ink); }
.gate-sub { color: var(--gate-teal-600); font-size: 15px; margin: 0 0 24px; }
.auth-gate-inner {
  width: 100%;
  max-width: 380px;
  margin: 0 auto;
  background: #fff;
  border-radius: 20px;
  padding: 26px 22px;
  box-shadow: 0 1px 3px rgba(11,43,34,0.06);
}
.gate-divider {
  display: flex; align-items: center; gap: 10px;
  color: var(--gate-teal-600); font-size: 11px;
  font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  margin: 18px 0;
}
.gate-divider::before, .gate-divider::after {
  content: ""; flex: 1; height: 1px; background: var(--gate-line);
}
#authForm { display: flex; flex-direction: column; gap: 16px; text-align: left; }
#authForm label { display: flex; flex-direction: column; gap: 6px; font-size: 13.5px; font-weight: 700; color: var(--gate-ink); }
#gateNameField[hidden] { display: none; }
#gatePasswordField[hidden] { display: none; }
#authForm input[type="email"], #authForm input[type="password"], #authForm input[type="text"] {
  padding: 13px 14px;
  border: 1.5px solid var(--gate-line);
  border-radius: 10px;
  font-size: 15px;
  font-family: var(--body);
  color: var(--gate-ink);
}
#authForm input:focus-visible { outline: 2px solid var(--gate-teal-700); outline-offset: 1px; }
.gate-row {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13.5px;
}
.gate-row[hidden] { display: none; }
.remember-label { display: flex; align-items: center; gap: 8px; color: var(--gate-ink); font-weight: 500; }
.remember-label input[type="checkbox"] { accent-color: var(--gate-teal-700); width: 16px; height: 16px; }
.link-btn {
  background: none; border: none; padding: 0; cursor: pointer;
  color: var(--gate-teal-700); font-weight: 700; font-size: 13.5px; font-family: var(--body);
}
.link-btn.block { display: block; width: 100%; text-align: center; margin-top: 18px; font-size: 14px; }
.link-btn.strong { color: var(--gate-teal-700); }
.gate-toggle { margin: 18px 0 0; color: var(--slate); font-size: 14px; }
.form-notice {
  background: #E7F5EF; color: var(--gate-teal-700);
  font-size: 13.5px; padding: 12px 14px; border-radius: 12px; margin: 0 0 18px;
  border: 1px solid #BEE3D3;
}
.form-error {
  background: #FDECEE; color: #B0263E;
  font-size: 13.5px; padding: 12px 14px; border-radius: 12px; margin: 0 0 18px;
  border: 1px solid #F5C2CC;
}
.primary-btn {
  width: 100%;
  background: var(--gate-teal-700);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 15px;
  font-family: var(--body);
  font-weight: 700;
  font-size: 15.5px;
  cursor: pointer;
}
.primary-btn:disabled { opacity: 0.6; }
.google-btn {
  width: 100%;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  background: var(--paper-raised);
  border: 1.5px solid var(--gate-line);
  border-radius: 12px;
  padding: 13px;
  font-family: var(--body);
  font-weight: 600;
  font-size: 14.5px;
  color: var(--ink);
  cursor: pointer;
}
.google-btn:hover { background: var(--paper); }
.google-btn:focus-visible { outline: 2px solid var(--gate-teal-700); outline-offset: 2px; }

/* Topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(14px + var(--safe-top)) 16px 14px;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 3px solid var(--stamp-red);
}
.topbar-title { display: flex; align-items: baseline; gap: 8px; }
.topbar-mark {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 13px;
  background: var(--stamp-red);
  color: var(--paper);
  padding: 3px 6px;
  border-radius: 3px;
  letter-spacing: 0.03em;
}
.topbar-name {
  font-family: var(--display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.01em;
}
.topbar-name em { font-style: normal; color: #C9A876; }

.ghost-btn {
  background: transparent;
  border: 1.5px solid rgba(250,247,240,0.5);
  color: var(--paper);
  font-family: var(--body);
  font-weight: 500;
  font-size: 14px;
  padding: 7px 14px;
  border-radius: 20px;
  cursor: pointer;
}
.ghost-btn:hover { border-color: var(--paper); }
.ghost-btn:focus-visible { outline: 2px solid #C9A876; outline-offset: 2px; }

/* Search */
.search-wrap { padding: 16px; }
#searchInput {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  background: var(--paper-raised);
  font-family: var(--body);
  font-size: 15px;
  color: var(--ink);
}
#searchInput:focus-visible {
  outline: 2px solid var(--stamp-red);
  outline-offset: 1px;
}

/* Subject drawer tabs */
.drawer-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 16px 10px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.drawer-tabs::-webkit-scrollbar { display: none; }
.drawer-tab {
  flex: none;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 8px 14px;
  border-radius: 6px 6px 0 0;
  background: var(--paper-raised);
  border: 1.5px solid var(--line);
  border-bottom: none;
  color: var(--slate);
  cursor: pointer;
  white-space: nowrap;
}
.drawer-tab.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.drawer-tab:focus-visible { outline: 2px solid var(--stamp-red); outline-offset: 2px; }

/* Type filter chips */
.type-filters {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 16px 16px;
  border-bottom: 1.5px solid var(--line);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.type-filters::-webkit-scrollbar { display: none; }
.type-chip {
  flex: none;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: 20px;
  border: 1.5px solid currentColor;
  background: transparent;
  cursor: pointer;
  white-space: nowrap;
}
.type-chip.active { color: var(--paper) !important; background: var(--stamp-color, var(--ink)); border-color: var(--stamp-color, var(--ink)); }

/* Catalog grid */
.catalog {
  padding: 16px;
  display: grid;
  gap: 12px;
}
@media (min-width: 640px) {
  .catalog { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .catalog { grid-template-columns: repeat(3, 1fr); }
}

.loading { color: var(--slate); font-size: 14px; padding: 20px 0; text-align: center; }

.res-card {
  background: var(--paper-raised);
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  position: relative;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  text-align: left;
  font-family: var(--body);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.res-card:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(27,42,74,0.08); }
.res-card:focus-visible { outline: 2px solid var(--stamp-red); outline-offset: 2px; }

.res-stamp {
  align-self: flex-start;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: 3px;
  color: #fff;
  transform: rotate(-2deg);
}
.res-title {
  font-family: var(--display);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
  margin: 0;
}
.res-meta {
  font-size: 12.5px;
  color: var(--slate);
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.res-meta span:not(:last-child)::after { content: "·"; margin-left: 6px; color: var(--line); }
.res-unavailable {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--kraft);
  margin-top: 2px;
}
.res-actions { display: flex; gap: 8px; margin-top: 4px; }
.res-action-btn {
  flex: 1;
  font-family: var(--body);
  font-weight: 600;
  font-size: 13px;
  padding: 8px 0;
  border-radius: 7px;
  border: 1.5px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.res-action-btn.primary { background: var(--ink); color: var(--paper); }
.res-action-btn:focus-visible { outline: 2px solid var(--stamp-red); outline-offset: 2px; }
.res-action-btn:disabled { opacity: 0.4; cursor: default; }

/* Empty state */
.empty-state { text-align: center; padding: 60px 24px; color: var(--slate); }
.stamp-mark {
  display: inline-block;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stamp-red);
  border: 1.5px solid var(--stamp-red);
  padding: 3px 10px;
  border-radius: 3px;
  transform: rotate(-2deg);
  margin-bottom: 10px;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(27,42,74,0.55);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 100;
}
.modal-backdrop[hidden] {
  display: none;
}
@media (min-width: 640px) {
  .modal-backdrop { align-items: center; }
}
.modal.card-catalog {
  background: var(--paper-raised);
  width: 100%;
  max-width: 420px;
  border-radius: 16px 16px 0 0;
  padding: 28px 22px calc(24px + var(--safe-bottom));
  position: relative;
  border-top: 3px solid var(--stamp-red);
}
@media (min-width: 640px) {
  .modal.card-catalog { border-radius: 16px; border-top: 3px solid var(--stamp-red); }
}
.modal-close {
  position: absolute;
  top: 14px; right: 16px;
  background: none; border: none;
  font-size: 22px; color: var(--slate);
  cursor: pointer;
}
.modal h2 { font-family: var(--display); margin: 6px 0 18px; font-size: 22px; }

/* Viewer */
.viewer {
  position: fixed;
  inset: 0;
  background: var(--ink);
  z-index: 200;
  display: flex;
  flex-direction: column;
}
.viewer[hidden] {
  display: none;
}
.viewer-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: calc(12px + var(--safe-top)) 14px 12px;
  background: var(--ink);
  border-bottom: 2px solid var(--stamp-red);
}
.viewer-title {
  color: var(--paper);
  font-family: var(--display);
  font-size: 15px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.viewer-pages {
  flex: 1;
  overflow-y: auto;
  background: #525659;
  padding: 16px 0;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}
.viewer-page-wrap {
  position: relative;
  max-width: 900px;
  margin: 0 auto 14px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.35);
}
.viewer-page-wrap canvas {
  display: block;
  width: 100%;
  height: auto;
  -webkit-user-drag: none;
  pointer-events: none;
}
.viewer-watermark {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  place-items: center;
  opacity: 0.16;
}
.viewer-watermark span {
  font-family: var(--mono);
  font-size: 11px;
  color: #000;
  transform: rotate(-28deg);
  white-space: nowrap;
}
.viewer-loading {
  color: var(--paper);
  text-align: center;
  padding: 40px 16px;
  font-size: 14px;
}