@import url("https://fonts.googleapis.com/css2?family=Mukta:wght@400;500;600;700;800&display=swap");

:root {
  --navy: #16213e;
  --ink: #14213d;
  --muted: #5b6b7f;
  --line: #d9e3f0;
  --canvas: #f7faff;
  --white: #ffffff;
  --red: #ff3b30;
  --orange: #ff6b35;
  --yellow: #ffc300;
  --lime: #83d91f;
  --green: #00c853;
  --cyan: #00b8d9;
  --blue: #1677ff;
  --violet: #7a4dff;
  --pink: #ff2d95;
  --shadow: 0 18px 50px rgba(22, 33, 62, 0.10);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; overflow-x: hidden; overflow-y: auto; }

body {
  margin: 0;
  min-width: 0;
  min-height: 100dvh;
  background: var(--canvas);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overscroll-behavior-y: auto;
  overflow-x: hidden;
  overflow-y: auto;
  touch-action: pan-y;
  -webkit-tap-highlight-color: transparent;
}

button, input, select { font: inherit; }
button { cursor: pointer; }

.rainbow-line {
  height: 7px;
  background: linear-gradient(90deg, var(--red), var(--orange), var(--yellow), var(--green), var(--cyan), var(--blue), var(--violet), var(--pink));
}

.app-shell { min-height: 100dvh; }

.topbar { 
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: max(11px, env(safe-area-inset-top)) clamp(12px, 3vw, 32px) 11px;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand-lockup { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-identity { display: flex; align-items: center; min-width: 0; }
.brand-logo { display: block; width: 185px; height: 74px; flex: 0 0 auto; object-fit: cover; object-position: center 46%; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  color: var(--white);
  font-size: 25px;
  font-weight: 900;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--blue), var(--violet) 55%, var(--pink));
  box-shadow: 0 8px 18px rgba(122, 77, 255, 0.25);
}

.eyebrow, .kicker {
  margin: 0 0 5px;
  color: var(--muted);
  font-size: 0.71rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.topbar h1 { margin: 0; font-size: clamp(1.15rem, 2vw, 1.5rem); letter-spacing: -0.03em; }
.topbar-actions { display: flex; align-items: center; gap: 9px; min-width: 0; }
.header-website-button { display: inline-flex; align-items: center; min-height: 31px; padding: 6px 9px; color: var(--blue); font-size: .66rem; font-weight: 900; text-decoration: none; border: 1px solid #cfe0f7; border-radius: 10px; background: #f6faff; white-space: nowrap; }
.header-website-button:hover { color: var(--white); border-color: transparent; background: linear-gradient(135deg, var(--blue), var(--violet)); }
.fullscreen-button { display: inline-flex; align-items: center; gap: 7px; min-height: 36px; padding: 7px 11px; color: var(--navy); font-size: .72rem; font-weight: 900; border: 1px solid var(--line); border-radius: 11px; background: #fff; box-shadow: 0 5px 14px rgba(22,33,62,.06); }
.fullscreen-button:hover, .fullscreen-button[aria-pressed="true"] { color: var(--white); border-color: transparent; background: linear-gradient(135deg, var(--blue), var(--violet)); }
.fullscreen-button > span:first-child { font-size: 1rem; line-height: 1; }
.catalogue-pill { display: flex; align-items: center; gap: 8px; padding: 8px 12px; color: var(--navy); font-size: 0.78rem; font-weight: 800; border: 1px solid var(--line); border-radius: 999px; background: var(--white); white-space: nowrap; }
.pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px rgba(0, 200, 83, 0.14); }

.main-content { width: min(1240px, 100%); margin: 0 auto; padding: clamp(12px, 2.4vw, 24px) clamp(14px, 4vw, 48px) 26px; }

.overview-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  min-width: 0;
  padding: clamp(22px, 4vw, 32px);
  color: var(--white);
  overflow: hidden;
  border-radius: 25px;
  background: linear-gradient(120deg, #111b35 0%, #193a6b 58%, #392078 100%);
  box-shadow: var(--shadow);
}
.overview-card::after {
  content: "";
  position: absolute;
  inset: auto -9% -70% 45%;
  height: 175%;
  background: linear-gradient(135deg, rgba(0, 184, 217, .28), rgba(255, 45, 149, .34));
  transform: rotate(-13deg);
  border-radius: 45%;
}
.overview-card > * { position: relative; z-index: 1; }
.overview-copy { min-width: 0; }
.overview-card .kicker { color: #83efff; }
.overview-card h2 { max-width: 680px; margin: 0; font-size: clamp(1.7rem, 4.3vw, 3rem); line-height: 1.04; letter-spacing: -.055em; }
.hero-copy { max-width: 680px; margin: 11px 0 0; color: #d6e6ff; font-size: .92rem; line-height: 1.45; }
.overview-button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 43px;
  margin-top: 18px;
  padding: 9px 12px;
  color: var(--navy);
  font-size: .82rem;
  font-weight: 900;
  border: 1px solid rgba(255,255,255,.35);
  border-radius: 13px;
  background: var(--white);
  box-shadow: 0 8px 18px rgba(0,0,0,.12);
}
.overview-button:hover, .overview-button.active { color: var(--white); background: linear-gradient(135deg, var(--cyan), var(--blue)); }
.overview-button-icon { color: var(--pink); font-size: 1.05rem; }
.overview-button.active .overview-button-icon { color: var(--yellow); }
.overview-arrow { font-size: 1rem; }
.overview-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin-top: 17px; }
.overview-helper { display: inline-flex; align-items: center; gap: 7px; color: #cfe2ff; font-size: .74rem; font-weight: 800; }
.overview-helper > span:first-child { display: grid; place-items: center; width: 23px; height: 23px; color: var(--navy); border-radius: 8px; background: var(--yellow); }
.website-button { display: inline-flex; align-items: center; gap: 8px; min-height: 39px; padding: 8px 12px; color: var(--navy); font-size: .76rem; font-weight: 900; text-decoration: none; border: 1px solid rgba(255,255,255,.35); border-radius: 12px; background: var(--white); box-shadow: 0 8px 18px rgba(0,0,0,.12); }
.website-button:hover { color: var(--white); background: linear-gradient(135deg, var(--pink), var(--violet)); }
.overview-stat-main { display: grid; align-content: center; min-width: 112px; padding: 16px; text-align: center; border: 1px solid rgba(255,255,255,.22); border-radius: 18px; background: rgba(255,255,255,.11); backdrop-filter: blur(9px); }
.overview-stat-main strong { font-size: 2.15rem; line-height: 1; }
.overview-stat-main span { margin-top: 7px; color: #d9e7ff; font-size: .7rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.overview-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 9px; grid-column: 1 / -1; }
.overview-stat { min-width: 0; padding: 11px 13px; border: 1px solid rgba(255,255,255,.16); border-radius: 13px; background: rgba(255,255,255,.10); }
.overview-stat span { display: block; margin-bottom: 5px; color: #c6dbfb; font-size: .65rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.overview-stat strong { display: block; color: var(--white); font-size: .96rem; line-height: 1.1; overflow-wrap: anywhere; }

.grades-section { margin: 16px 0; padding: 18px; border: 1px solid var(--line); border-radius: 21px; background: linear-gradient(135deg, #ffffff 0%, #f2f8ff 52%, #fff5fb 100%); box-shadow: 0 10px 28px rgba(22,33,62,.05); }
.grades-heading { display: flex; align-items: end; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.grades-heading h2 { margin: 0; font-size: 1.35rem; letter-spacing: -.035em; }
.grades-heading > span { color: var(--muted); font-size: .74rem; font-weight: 800; }
.browse-toggle { display: flex; align-items: center; gap: 5px; padding: 4px; color: var(--muted); font-size: .68rem; font-weight: 850; border: 1px solid var(--line); border-radius: 12px; background: rgba(255,255,255,.78); }
.browse-toggle > span { padding: 0 4px 0 6px; }
.browse-toggle button { min-height: 29px; padding: 5px 9px; color: var(--muted); font-size: .7rem; font-weight: 900; border: 0; border-radius: 8px; background: transparent; }
.browse-toggle button:hover, .browse-toggle button.active { color: var(--white); background: linear-gradient(135deg, var(--blue), var(--violet)); box-shadow: 0 4px 10px rgba(73,76,231,.2); }

.hero-card {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  min-height: 190px;
  padding: clamp(22px, 4vw, 36px);
  color: var(--white);
  overflow: hidden;
  position: relative;
  border-radius: 25px;
  background: linear-gradient(120deg, #111b35 0%, #193a6b 58%, #392078 100%);
  box-shadow: var(--shadow);
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: auto -9% -65% 48%;
  height: 170%;
  background: linear-gradient(135deg, rgba(0, 184, 217, 0.30), rgba(255, 45, 149, 0.34));
  transform: rotate(-13deg);
  border-radius: 45%;
}

.hero-card > * { position: relative; z-index: 1; }
.hero-card .kicker { color: #83efff; }
.hero-card h2 { max-width: 680px; margin: 0; font-size: clamp(1.7rem, 4.3vw, 3.2rem); line-height: 1.04; letter-spacing: -0.055em; }
.hero-copy { max-width: 680px; margin: 13px 0 0; color: #d6e6ff; font-size: 0.98rem; line-height: 1.55; }
.hero-stat { display: grid; min-width: 130px; padding: 17px; text-align: center; border: 1px solid rgba(255,255,255,.22); border-radius: 18px; background: rgba(255,255,255,.11); backdrop-filter: blur(9px); }
.hero-stat strong { font-size: 2.2rem; line-height: 1; }
.hero-stat span { margin-top: 7px; color: #d9e7ff; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }

.kpi-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 14px 0 26px; }
.kpi-card { min-height: 91px; padding: 16px 17px; border-radius: 18px; box-shadow: 0 10px 25px rgba(22,33,62,.06); }
.kpi-card span { display: block; margin-bottom: 10px; color: rgba(255,255,255,.88); font-size: .68rem; font-weight: 900; letter-spacing: .10em; }
.kpi-card strong { display: block; color: var(--white); font-size: clamp(1rem, 2vw, 1.32rem); line-height: 1.1; }
.kpi-cyan { background: linear-gradient(135deg, #00a9c6, #00d7bc); }
.kpi-blue { background: linear-gradient(135deg, #1266de, #338eff); }
.kpi-orange { background: linear-gradient(135deg, #f04d27, #ff8950); }
.kpi-violet { background: linear-gradient(135deg, #6938e9, #a061ff); }

.dashboard-layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 16px; align-items: start; }
.control-panel, .catalogue-panel, .addons-section, .commercial-note { border: 1px solid var(--line); background: var(--white); box-shadow: 0 10px 28px rgba(22,33,62,.05); }
.control-panel { position: sticky; top: 91px; padding: 20px; border-radius: 21px; }
.panel-heading h2, .catalogue-toolbar h2, .section-heading h2 { margin: 0; font-size: 1.35rem; letter-spacing: -.035em; }
.field-label { display: grid; gap: 8px; margin-top: 18px; color: var(--ink); font-size: .8rem; font-weight: 800; }
input, select { width: 100%; min-height: 44px; padding: 10px 12px; color: var(--ink); border: 1px solid #cad7e8; border-radius: 12px; outline: none; background: #fbfdff; }
input:focus, select:focus { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(22,119,255,.12); }
.level-heading { display: flex; align-items: center; justify-content: space-between; margin: 22px 0 9px; color: var(--muted); font-size: .71rem; font-weight: 900; letter-spacing: .12em; }
.level-heading button { padding: 0; color: var(--blue); font-size: .76rem; font-weight: 800; border: 0; background: none; }
.level-chips { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; min-width: 0; }
.level-chip { display: grid; grid-template-columns: 32px minmax(0, 1fr) auto; align-items: center; gap: 8px; width: 100%; min-width: 0; min-height: 52px; padding: 8px 10px; color: var(--ink); text-align: left; font-size: .78rem; font-weight: 850; border: 1px solid color-mix(in srgb, var(--chip-accent, var(--blue)) 22%, white); border-radius: 14px; background: color-mix(in srgb, var(--chip-accent, var(--blue)) 9%, white); box-shadow: inset 4px 0 var(--chip-accent, var(--blue)); }
.level-chip:hover, .level-chip.active { color: var(--white); border-color: transparent; background: linear-gradient(135deg, var(--chip-accent, var(--blue)), var(--violet)); box-shadow: 0 7px 16px color-mix(in srgb, var(--chip-accent, var(--blue)) 30%, transparent); }
.chip-badge { display: grid; place-items: center; width: 30px; height: 30px; color: var(--white); font-size: .74rem; font-weight: 950; border-radius: 10px; background: var(--chip-accent, var(--blue)); }
.chip-label { min-width: 0; overflow-wrap: anywhere; }
.chip-arrow { font-size: 1rem; opacity: .65; }
.level-chip.active .chip-arrow { opacity: 1; }
.filter-footer { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 18px; color: var(--muted); font-size: .7rem; font-weight: 750; }
.filter-footer button { padding: 0; color: var(--blue); font-size: .76rem; font-weight: 850; border: 0; background: none; }
.panel-tip { display: flex; gap: 9px; margin-top: 21px; padding: 11px; border-radius: 13px; background: linear-gradient(135deg, #e6fbff, #f6edff); }
.tip-icon { color: var(--pink); font-size: 1rem; }
.panel-tip p { margin: 0; color: var(--muted); font-size: .75rem; line-height: 1.45; }

.catalogue-panel { min-width: 0; padding: 20px; border-radius: 21px; }
.catalogue-toolbar, .section-heading { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.result-summary { display: grid; justify-items: end; gap: 4px; }
.result-count, .section-count { color: var(--blue); font-size: .8rem; font-weight: 900; white-space: nowrap; }
.result-total { color: var(--violet); font-size: .72rem; font-weight: 900; white-space: nowrap; }
.book-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 11px; }
.book-card { position: relative; display: grid; grid-template-columns: 35px minmax(0, 1fr) auto; gap: 11px; align-items: center; min-width: 0; padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: #fff; transition: transform .18s ease, box-shadow .18s ease; }
.book-card:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(22,33,62,.10); }
.book-card::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 5px; border-radius: 16px 0 0 16px; background: var(--accent, var(--blue)); }
.book-index { display: grid; place-items: center; width: 31px; height: 31px; color: var(--white); font-size: .76rem; font-weight: 900; border-radius: 10px; background: var(--accent, var(--blue)); }
.book-copy { min-width: 0; }
.book-title { margin: 0; color: var(--ink); font-size: .94rem; font-weight: 850; line-height: 1.25; overflow-wrap: anywhere; }
.book-subject { display: inline-block; margin-top: 7px; padding: 4px 7px; color: var(--accent, var(--blue)); font-size: .68rem; font-weight: 850; border-radius: 6px; background: color-mix(in srgb, var(--accent, var(--blue)) 11%, white); }
.hindi-title .book-title, .hindi-title .book-subject { font-family: "Mukta", "Noto Sans Devanagari", "Nirmala UI", sans-serif; }
.book-price { min-width: 64px; padding: 9px 8px; color: var(--ink); text-align: center; font-size: .83rem; font-weight: 950; border-radius: 10px; background: #fff3bf; }

.empty-state { padding: 52px 16px; text-align: center; }
.empty-icon { display: grid; place-items: center; width: 52px; height: 52px; margin: 0 auto 12px; color: var(--white); font-size: 1.5rem; border-radius: 16px; background: linear-gradient(135deg, var(--cyan), var(--violet)); }
.empty-state h3 { margin: 0; }
.empty-state p { color: var(--muted); }

.addons-section { margin-top: 16px; padding: 20px; border-radius: 21px; }
.section-heading { align-items: center; }
.addon-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.addon-card { padding: 13px; border: 1px solid #e0d5ff; border-radius: 14px; background: linear-gradient(135deg, #fbf8ff, #f1e8ff); }
.addon-card h3 { margin: 0 0 9px; font-size: .82rem; line-height: 1.25; }
.addon-meta { display: flex; justify-content: space-between; gap: 8px; color: var(--muted); font-size: .72rem; }
.addon-mrp { color: var(--violet); font-weight: 900; white-space: nowrap; }

body.modal-open { overflow: hidden; }
.addon-modal { position: fixed; inset: 0; z-index: 40; display: grid; place-items: center; padding: 24px; }
.addon-modal[hidden] { display: none !important; }
.addon-backdrop { position: absolute; inset: 0; background: rgba(20,33,61,.58); backdrop-filter: blur(8px); }
.addon-dialog { position: relative; z-index: 1; width: min(900px, 100%); max-height: min(760px, calc(100dvh - 32px)); overflow: auto; padding: 22px; border: 1px solid rgba(255,255,255,.7); border-radius: 24px; background: #fff; box-shadow: 0 26px 80px rgba(20,33,61,.28); }
.addon-modal-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
.addon-modal-header h2 { margin: 0; font-size: 1.4rem; }
.addon-modal-header p:last-child { margin: 4px 0 0; color: var(--muted); font-size: .75rem; font-weight: 800; }
.modal-close { display: grid; place-items: center; width: 38px; height: 38px; padding: 0; border: 1px solid var(--line); border-radius: 12px; color: var(--navy); background: #f6faff; font-size: 1.5rem; line-height: 1; }
.modal-close:hover { color: var(--white); border-color: transparent; background: var(--blue); }
.addon-modal-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }

.commercial-note { margin-top: 26px; padding: 13px 15px; color: var(--ink); border-color: #ffd56c; border-radius: 17px; background: #fff6cc; font-size: .72rem; line-height: 1.45; }
.commercial-note p { margin: 0; }
.commercial-note p + p { margin-top: 5px; }
.footer { padding: 25px 16px 34px; color: var(--muted); text-align: center; font-size: .76rem; font-weight: 700; }
.footer-website-button { display: inline-flex; align-items: center; gap: 5px; margin-left: 10px; color: var(--blue); font-size: .7rem; font-weight: 850; text-decoration: none; }
.footer-website-button:hover { color: var(--violet); text-decoration: underline; }

@media (display-mode: standalone), (display-mode: fullscreen) {
  body { background: #eef4ff; }
  .topbar { padding-top: max(14px, env(safe-area-inset-top)); }
  .footer { padding-bottom: max(34px, env(safe-area-inset-bottom)); }
}

@media (max-width: 900px) {
  .dashboard-layout { grid-template-columns: minmax(0, 1fr); min-width: 0; width: 100%; }
  .control-panel { position: static; }
  .control-panel, .catalogue-panel { min-width: 0; width: 100%; max-width: 100%; }
  .level-chips { overflow: visible; min-width: 0; width: 100%; max-width: 100%; }
}

@media (max-width: 650px) {
  html, body { max-width: 100%; overflow-x: hidden; overflow-y: auto; scroll-behavior: auto; }
  .topbar { flex-wrap: wrap; align-items: center; row-gap: 7px; padding: 10px 14px 11px; }
  .topbar, .brand-lockup { min-width: 0; }
  .brand-lockup { flex: 1 1 100%; width: 100%; gap: 8px; }
  .brand-lockup > div { min-width: 0; }
  .brand-logo { width: clamp(132px, 42vw, 168px); height: clamp(53px, 16.8vw, 67px); flex: 0 0 auto; }
  .brand-mark { width: 36px; height: 36px; flex-basis: 36px; font-size: 21px; border-radius: 11px; }
  .brand-lockup .eyebrow { margin-bottom: 3px; font-size: .58rem; line-height: 1; white-space: nowrap; }
  .topbar h1 { font-size: 1.1rem; line-height: 1.08; }
  .topbar-actions { flex: 1 1 100%; width: 100%; justify-content: flex-end; gap: 6px; }
  .catalogue-pill { display: none; }
  .header-website-button { min-height: 29px; padding: 5px 8px; font-size: .62rem; }
  .fullscreen-button { width: 34px; min-width: 34px; min-height: 32px; padding: 6px; justify-content: center; }
  .fullscreen-label { display: none; }
  .main-content, .dashboard-layout, .control-panel, .catalogue-panel, .addons-section, .book-grid, .addon-grid { width: 100%; max-width: 100%; min-width: 0; }
  .main-content { padding: 14px 12px 20px; }
  .dashboard-layout { grid-template-columns: minmax(0, 1fr); }
  .overview-card { grid-template-columns: minmax(0, 1fr); gap: 15px; padding: 20px; border-radius: 20px; }
  .overview-card h2 { font-size: 1.85rem; }
  .overview-actions { align-items: stretch; flex-direction: column; margin-top: 15px; }
  .website-button { justify-content: center; }
  .overview-stat-main { grid-column: 1; min-width: 0; padding: 12px 14px; text-align: left; grid-template-columns: auto auto; align-items: center; justify-content: space-between; }
  .overview-stat-main span { margin-top: 0; }
  .overview-stats { gap: 7px; }
  .overview-stat { padding: 10px; }
  .overview-stat span { font-size: .57rem; }
  .overview-stat strong { font-size: .82rem; }
  .grades-section { padding: 14px; border-radius: 17px; }
  .grades-heading { margin-bottom: 11px; }
  .grades-heading h2 { font-size: 1.15rem; }
  .grades-heading > span { font-size: .68rem; }
  .level-chips { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .level-chip { min-height: 50px; padding: 8px; font-size: .72rem; }
  .chip-badge { width: 28px; height: 28px; border-radius: 9px; }
  .hero-card { min-height: 0; align-items: stretch; flex-direction: column; gap: 18px; padding: 22px 19px; border-radius: 20px; }
  .hero-card h2 { font-size: 2rem; }
  .hero-copy { font-size: .88rem; }
  .hero-stat { width: 100%; grid-template-columns: auto auto; align-items: center; justify-content: space-between; min-width: 0; padding: 12px 14px; }
  .hero-stat span { margin-top: 0; }
  .kpi-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin-bottom: 16px; }
  .kpi-card { min-height: 78px; padding: 12px; border-radius: 14px; }
  .kpi-card span { margin-bottom: 7px; font-size: .59rem; }
  .kpi-card strong { font-size: .92rem; }
  .control-panel, .catalogue-panel, .addons-section { padding: 15px; border-radius: 17px; }
  .catalogue-toolbar { align-items: start; margin-bottom: 14px; }
  .result-summary { gap: 2px; }
  .result-total { font-size: .61rem; }
  .catalogue-toolbar h2, .section-heading h2 { font-size: 1.15rem; }
  .book-grid, .addon-grid { grid-template-columns: minmax(0, 1fr); }
  .book-card { grid-template-columns: 32px minmax(0, 1fr) 61px; width: 100%; max-width: 100%; min-width: 0; padding: 12px; }
  .book-copy { min-width: 0; }
  .book-title { font-size: .84rem; }
  .book-price { display: block; width: 61px; min-width: 61px; max-width: 61px; padding: 8px 6px; }
  .commercial-note { padding: 14px; font-size: .75rem; }
  .addon-modal { padding: 10px; align-items: end; }
  .addon-dialog { max-height: calc(100dvh - 20px); padding: 14px; border-radius: 20px 20px 14px 14px; }
  .addon-modal-header { margin-bottom: 10px; }
  .addon-modal-header h2 { font-size: 1.05rem; }
  .addon-modal-grid { grid-template-columns: minmax(0, 1fr); gap: 7px; }
  .addon-modal-grid .addon-card { padding: 10px; }
  .addon-modal-grid .addon-card h3 { font-size: .72rem; }
  .addon-modal-grid .addon-meta { font-size: .62rem; }
}

/* Compact mobile header: keep the brand clear and every action inside the viewport. */
@media (max-width: 650px) {
  .topbar { flex-wrap: nowrap; padding: max(7px, env(safe-area-inset-top)) 12px 7px; gap: 8px; }
  .brand-lockup { flex: 0 1 auto; width: auto; min-width: 0; }
  .topbar-actions { flex: 0 0 auto; width: auto; margin-left: auto; justify-content: flex-end; flex-wrap: nowrap; gap: 6px; }
  .header-website-button { min-height: 32px; padding: 6px 9px; font-size: .62rem; border-color: #ffb371; color: #713602; background: #fff3e8; box-shadow: 0 3px 10px rgba(255, 107, 53, .12); }
  .fullscreen-button { min-height: 30px; padding: 5px 7px; font-size: .6rem; }
  .fullscreen-label { display: none; }
  .catalogue-pill { display: none; }
  .browse-home .main-content { padding-top: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .book-card { transition: none; }
}

/* Browse screen state: the landing view and the selected catalogue are separate app-like screens. */
.browse-home .catalogue-screen, .browse-home .results-only { display: none; }
.results-open .overview-card { display: none !important; }
.results-open .grades-section { display: none; }
.catalogue-screen { display: none; }
.catalogue-screen.is-open { display: grid; }
body.browse-home, body.subject-browse, body.results-open { min-height: 100%; overflow-y: auto; }
.back-button { display: inline-flex; align-items: center; min-height: 40px; margin: 0 0 10px; padding: 7px 12px; color: var(--blue); font-size: .82rem; font-weight: 900; border: 1px solid #cfe0f7; border-radius: 11px; background: #f6faff; }
.back-button:hover { color: var(--violet); }
.catalogue-screen.is-open .catalogue-panel { min-width: 0; }

/* Distributor-first landing view: keep the catalogue chooser primary and the site link quiet. */
.browse-home .overview-card { padding: 22px clamp(18px, 3vw, 28px); gap: 14px; }
.browse-home .overview-card .hero-copy { margin-top: 7px; font-size: .82rem; }
.browse-home .overview-actions { margin-top: 11px; }
.browse-home .website-button { display: none; }
body.browse-home .overview-stats { display: grid; }
.book-grid[hidden], .special-grid[hidden], .addon-grid[hidden], #addonsSection[hidden] { display: none !important; }

.special-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.preprimary-open .control-panel, .addons-open .control-panel { display: none; }
.preprimary-open .catalogue-screen, .addons-open .catalogue-screen { grid-template-columns: minmax(0, 1fr); }
.section-toggle { display: inline-flex; align-items: center; gap: 8px; min-height: 32px; padding: 5px 9px; color: var(--blue); font-size: .72rem; font-weight: 900; border: 1px solid var(--line); border-radius: 999px; background: #fff; }
.section-toggle > span:last-child { display: grid; place-items: center; width: 18px; height: 18px; color: var(--white); border-radius: 50%; background: var(--blue); font-size: .9rem; line-height: 1; }
.section-toggle.active { color: var(--white); border-color: transparent; background: linear-gradient(135deg, var(--blue), var(--violet)); }
.section-toggle.active > span:last-child { color: var(--blue); background: var(--white); }

/* Keep the original rainbow sequence stable even after adding Pre-Primary. */
.level-chip[data-browse-value="Pre-Primary"] { --chip-accent: #7A4DFF; }
.level-chip[data-browse-value="Grade 1"] { --chip-accent: #FF3B30; }
.level-chip[data-browse-value="Grade 2"] { --chip-accent: #FF6B35; }
.level-chip[data-browse-value="Grade 3"] { --chip-accent: #FFC300; }
.level-chip[data-browse-value="Grade 4"] { --chip-accent: #00C853; }
.level-chip[data-browse-value="Grade 5"] { --chip-accent: #00B8D9; }
.level-chip[data-browse-value="Grade 6"] { --chip-accent: #1677FF; }
.level-chip[data-browse-value="Grade 7"] { --chip-accent: #7A4DFF; }
.level-chip[data-browse-value="Grade 8"] { --chip-accent: #FF2D95; }
.level-chip[data-browse-value="Grade 9"] { --chip-accent: #FF3B30; }
.level-chip[data-browse-value="Grade 10"] { --chip-accent: #FF6B35; }
.special-grid [data-preprimary-level="Nursery"] { --chip-accent: #1677FF; }
.special-grid [data-preprimary-level="LKG"] { --chip-accent: #FF6B35; }
.special-grid [data-preprimary-level="UKG"] { --chip-accent: #00C853; }

@media (max-width: 900px) {
  .catalogue-screen.is-open { grid-template-columns: minmax(0, 1fr); }
  .catalogue-screen.is-open .control-panel { display: none; }
}

@media (max-width: 650px) {
  .grades-heading { align-items: start; flex-direction: column; }
  .browse-toggle { width: 100%; justify-content: space-between; }
  .browse-toggle > span { margin-right: auto; }
  .browse-toggle button { flex: 1 1 0; }
  .catalogue-screen.is-open .catalogue-panel { padding: 15px; border-radius: 17px; }
  .catalogue-screen.is-open .catalogue-toolbar { align-items: start; }
  .footer-website-button { display: block; margin: 7px 0 0; }
  .special-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .special-grid .level-chip { min-height: 50px; padding: 8px; font-size: .72rem; }
  .section-heading { gap: 8px; }
  .section-toggle { min-height: 29px; padding: 4px 8px; font-size: .62rem; }
}

/* Compact mobile chooser: keep the overview premium but make the full grade set reachable immediately. */
@media (max-width: 650px) {
  .browse-home .main-content { padding-top: 10px; padding-bottom: 12px; }
  .browse-home .overview-card { gap: 9px; padding: 15px 16px; border-radius: 18px; }
  .browse-home .overview-card h2 { font-size: 1.62rem; line-height: 1.03; }
  .browse-home .overview-card .hero-copy { margin-top: 3px; font-size: .76rem; }
  .browse-home .overview-actions { margin-top: 5px; }
  .browse-home .overview-helper { gap: 5px; font-size: .66rem; }
  .browse-home .overview-helper > span:first-child { width: 20px; height: 20px; border-radius: 7px; }
  .browse-home .overview-stat-main { padding: 9px 12px; border-radius: 14px; }
  .browse-home .overview-stat-main strong { font-size: 1.78rem; }
  .browse-home .overview-stat-main span { font-size: .62rem; }
  .browse-home .overview-stats { gap: 6px; }
  .browse-home .overview-stat { padding: 8px 9px; border-radius: 11px; }
  .browse-home .overview-stat span { margin-bottom: 3px; font-size: .54rem; }
  .browse-home .overview-stat strong { font-size: .76rem; }
  .browse-home .grades-section { margin: 10px 0; padding: 10px; border-radius: 15px; }
  .browse-home .grades-heading { flex-direction: row; align-items: center; gap: 8px; margin-bottom: 7px; }
  .browse-home .grades-heading h2 { font-size: 1.05rem; }
  .browse-home .grades-heading > span { font-size: .62rem; }
  .browse-home .browse-toggle { width: auto; flex: 0 1 auto; }
  .browse-home .browse-toggle > span { margin-right: 0; font-size: .60rem; }
  .browse-home .browse-toggle button { flex: 0 0 auto; min-height: 27px; padding: 4px 8px; font-size: .64rem; }
  .browse-home .level-chips { gap: 6px; }
  .browse-home .level-chip { grid-template-columns: 26px minmax(0, 1fr) auto; gap: 6px; min-height: 44px; padding: 6px 7px; font-size: .66rem; border-radius: 12px; }
  .browse-home .chip-badge { width: 24px; height: 24px; font-size: .64rem; border-radius: 8px; }
  .browse-home .chip-arrow { font-size: .84rem; }
}

/* Subject browsing intentionally remains scrollable: the full subject list is available below the fold. */
@media (max-width: 650px) {
  body.subject-browse .main-content { padding-top: 10px; }
  body.subject-browse .main-content,
  body.results-open .main-content { min-height: calc(100dvh + 1px); padding-bottom: calc(34px + env(safe-area-inset-bottom)); }
  body.subject-browse .grades-section { margin-top: 10px; padding-bottom: 18px; }
  body.subject-browse .level-chips { overflow: visible; }
  body.subject-browse .level-chip { min-height: 42px; padding: 5px 6px; gap: 5px; font-size: .64rem; }
  body.subject-browse .chip-badge { width: 23px; height: 23px; font-size: .6rem; }
  body.subject-browse .chip-arrow { font-size: .78rem; }
}

    @media (max-width: 350px) {
      .browse-home .overview-helper { display: none; }
      .browse-home .grades-heading { align-items: start; flex-direction: column; }
      .browse-home .browse-toggle { width: 100%; }
      .browse-home .browse-toggle button { flex: 1 1 0; }
      .browse-home .level-chip { min-height: 40px; padding: 5px 6px; }
      .browse-home .chip-badge { width: 23px; height: 23px; }
    }

/* Selected-grade screen: remove the landing overview and keep the catalogue compact. */
@media (max-width: 650px) {
  body.results-open .main-content { padding-top: 10px; }
  body.results-open .catalogue-screen.is-open .catalogue-panel { padding: 10px; border-radius: 14px; }
  body.results-open .catalogue-toolbar { margin-bottom: 8px; gap: 6px; }
  body.results-open .catalogue-toolbar h2 { font-size: 1.08rem; line-height: 1.1; }
  body.results-open .result-count { font-size: .66rem; }
  body.results-open .result-total { font-size: .60rem; }
  body.results-open .back-button { min-height: 38px; margin-bottom: 7px; padding: 6px 11px; font-size: .75rem; }
  body.results-open .book-grid { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; gap: 6px; width: 100%; }
  body.results-open .book-card { grid-template-columns: minmax(0, 1fr) auto; grid-template-areas: "index price" "copy copy"; align-items: start; gap: 5px 6px; min-height: 0; padding: 8px 8px 9px 9px; border-radius: 10px; }
  body.results-open .book-card::before { width: 3px; border-radius: 10px 0 0 10px; }
  body.results-open .book-index { grid-area: index; width: 22px; height: 22px; font-size: .58rem; border-radius: 7px; }
  body.results-open.subject-view .book-index { width: auto; min-width: 52px; padding: 0 5px; font-size: .55rem; }
  body.results-open .book-copy { grid-area: copy; min-width: 0; }
  body.results-open .book-title { font-size: .74rem; line-height: 1.15; display: block; overflow: visible; overflow-wrap: normal; word-break: normal; hyphens: auto; }
  body.results-open .book-subject { display: inline-block; max-width: 100%; margin-top: 4px; padding: 2px 4px; font-size: .56rem; line-height: 1.15; border-radius: 5px; white-space: normal; overflow-wrap: anywhere; }
  body.results-open .book-price { grid-area: price; width: 49px; min-width: 49px; max-width: 49px; padding: 5px 2px; font-size: .61rem; border-radius: 7px; }
  body.results-open .addons-section { margin-top: 11px; padding: 10px; border-radius: 13px; }
  body.results-open .addons-section .section-heading { margin-bottom: 6px; gap: 6px; }
  body.results-open .addons-section .section-heading h2 { font-size: .88rem; }
  body.results-open .addons-section .eyebrow { margin-bottom: 2px; font-size: .58rem; }
  body.results-open .addons-section .section-toggle { min-height: 27px; padding: 3px 7px; font-size: .58rem; }
  body.results-open .addon-card { padding: 10px; }
  body.results-open .addon-card h3 { margin-bottom: 6px; font-size: .72rem; }
  body.results-open .addon-meta { font-size: .62rem; }
  body.results-open .commercial-note { margin-top: 26px; margin-bottom: 15px; padding: 10px 11px; font-size: .64rem; line-height: 1.35; }
  body.results-open .main-content { padding-bottom: calc(42px + env(safe-area-inset-bottom)); }
}