/* =========================================================
   LearnLeaf — shared stylesheet
   All pages import this file so brand/theme stays consistent.
   ========================================================= */

:root {
  --color-bg: #fbfaf6;
  --color-surface: #ffffff;
  --color-text: #2b2a28;
  --color-text-muted: #6b6a67;
  --color-primary: #2f7a5f;      /* deep leaf green */
  --color-primary-dark: #235d47;
  --color-accent: #e8a13a;       /* warm amber */
  --color-border: #e7e4db;
  --radius-lg: 18px;
  --radius-md: 12px;
  --shadow-card: 0 2px 6px rgba(43, 42, 40, 0.06), 0 1px 2px rgba(43, 42, 40, 0.08);
  --shadow-card-hover: 0 10px 20px rgba(43, 42, 40, 0.10), 0 2px 6px rgba(43, 42, 40, 0.08);
  --max-width: 1120px;
  --font-heading: "Poppins", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.5em;
}

p { margin: 0 0 1em; }

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

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

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

/* ---------- Header ---------- */

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 16px;
  padding-bottom: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-primary-dark);
}

.brand-mark {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  gap: 28px;
}

.main-nav a {
  font-weight: 500;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary-dark);
  border-color: var(--color-accent);
}

/* ---------- Categories dropdown ---------- */

.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 5px;
  background: none;
  border: none;
  font-family: inherit;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-dropdown-toggle:hover,
.nav-dropdown.open .nav-dropdown-toggle {
  color: var(--color-primary-dark);
  border-color: var(--color-accent);
}

.nav-dropdown-toggle .chevron {
  width: 9px;
  height: 9px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.15s ease;
  margin-top: -3px;
}

.nav-dropdown.open .nav-dropdown-toggle .chevron {
  transform: rotate(-135deg);
  margin-top: 3px;
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 240px;
  max-height: 70vh;
  overflow-y: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card-hover);
  padding: 8px;
  z-index: 30;
}

.nav-dropdown.open .nav-dropdown-menu {
  display: flex;
  flex-direction: column;
}

.nav-dropdown-menu a {
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
}

.nav-dropdown-menu a:hover {
  background: var(--color-bg);
  color: var(--color-primary-dark);
}

.main-nav a.subscribe-link {
  background: var(--color-primary);
  color: #fff;
  border-radius: 999px;
  padding: 7px 16px;
  border-bottom: none;
}

.main-nav a.subscribe-link:hover {
  background: var(--color-primary-dark);
  color: #fff;
  border-color: transparent;
}

/* ---------- Search ---------- */

.search-box {
  position: relative;
  width: 240px;
  flex-shrink: 0;
}

.search-input {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 9px 14px 9px 36px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b6a67' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'/%3E%3C/svg%3E") no-repeat 12px center;
  background-size: 15px 15px;
  color: var(--color-text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 15%, transparent);
}

.search-input::-webkit-search-cancel-button { display: none; }

.search-results {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 320px;
  max-height: 420px;
  overflow-y: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card-hover);
  padding: 8px;
  z-index: 30;
}

.search-group-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  padding: 8px 10px 4px;
}

.search-result {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
}

.search-result:hover,
.search-result:focus {
  background: var(--color-bg);
}

.search-result-subject span:last-child {
  font-weight: 600;
}

.search-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.search-result-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.search-result-title {
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-result-meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.search-result mark {
  background: color-mix(in srgb, var(--color-accent) 35%, white);
  color: inherit;
  border-radius: 3px;
}

.search-empty {
  padding: 14px 10px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
}

@media (max-width: 640px) {
  .search-box, .search-results { width: 100%; }
}

/* ---------- Hero ---------- */

.hero {
  padding: 64px 0 48px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  color: var(--color-primary-dark);
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.hero p.lede {
  max-width: 560px;
  margin: 0 auto;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.hero-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 22px;
  flex-wrap: wrap;
}

.hero-badge {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ---------- Section heading ---------- */

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 22px;
  flex-wrap: wrap;
  gap: 8px;
}

.section-heading h2 {
  font-size: 1.5rem;
  color: var(--color-text);
}

.section-heading .sub {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* ---------- Category grid (home page) ---------- */

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 22px;
  padding-bottom: 72px;
}

.category-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  display: block;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent);
}

.category-thumb {
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.category-thumb svg { width: 56%; height: 56%; }
.category-thumb img { width: 56%; height: 56%; object-fit: contain; border-radius: 50%; }

.category-body {
  padding: 16px 18px 20px;
}

.category-body h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.category-body p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

.category-count {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  background: color-mix(in srgb, var(--color-primary) 12%, white);
  border-radius: 999px;
  padding: 3px 10px;
}

/* ---------- Worksheet grid (subject page) ---------- */

.worksheet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  padding-bottom: 72px;
}

.worksheet-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.worksheet-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent);
}

.worksheet-thumb {
  aspect-ratio: 3 / 4;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: #f1efe8;
}

.worksheet-thumb svg { width: 50%; height: 50%; }

.worksheet-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

.age-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(255,255,255,0.92);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 9px;
  color: var(--color-text);
}

.worksheet-body {
  padding: 14px 16px 18px;
}

.worksheet-body h3 {
  font-size: 0.98rem;
  margin-bottom: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--color-primary);
  color: #fff;
  transition: background 0.15s ease;
}

.btn:hover { background: var(--color-primary-dark); }

.btn-block { width: 100%; justify-content: center; }

/* ---------- Subcategory quick-nav ---------- */

.subcat-nav {
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 8px;
  padding: 20px 0 14px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
  -webkit-mask-image: linear-gradient(to right, transparent, black 16px, black calc(100% - 24px), transparent);
  mask-image: linear-gradient(to right, transparent, black 16px, black calc(100% - 24px), transparent);
}

.subcat-chip {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  flex: 0 0 auto;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.subcat-chip:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

.subject-section {
  scroll-margin-top: 88px;
  padding-top: 40px;
}

.subject-section h2 {
  font-size: 1.3rem;
}

.subject-section h2 .count {
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* ---------- Subject page header ---------- */

.subject-hero {
  padding: 44px 0 12px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.subject-hero .icon-badge {
  width: 68px;
  height: 68px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.subject-hero .icon-badge svg { width: 60%; height: 60%; }

.subject-hero h1 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  margin-bottom: 2px;
}

.subject-hero p {
  color: var(--color-text-muted);
  margin-bottom: 0;
}

.breadcrumb {
  padding-top: 22px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.breadcrumb a { color: var(--color-primary-dark); font-weight: 500; }

/* ---------- Footer ---------- */

.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.85);
  margin-top: 40px;
}

.site-footer .wrap {
  padding: 40px 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.site-footer .brand { color: #fff; }

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.8);
}

.footer-links a:hover { color: #fff; }

.footer-note {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.55);
  margin-top: 18px;
  width: 100%;
}

.footer-legal {
  font-size: 0.8rem;
  margin-top: 6px;
  width: 100%;
}

.footer-legal a {
  color: rgba(255,255,255,0.65);
  text-decoration: underline;
}

.footer-legal a:hover {
  color: #fff;
}

@media (max-width: 640px) {
  .main-nav { gap: 16px; }
  .site-header .wrap { flex-direction: column; gap: 12px; padding-bottom: 14px;}
  .subject-hero { flex-direction: column; text-align: center; }
}

/* ---------- Subscribe page ---------- */

.subscribe-hero {
  padding: 56px 0 8px;
  text-align: center;
}

.subscribe-hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  color: var(--color-primary-dark);
  max-width: 640px;
  margin: 0 auto 12px;
}

.subscribe-hero .lede {
  max-width: 520px;
  margin: 0 auto;
  color: var(--color-text-muted);
}

.subscribe-form-section {
  max-width: 560px;
  padding: 32px 24px 80px;
}

.subscribe-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 26px;
  box-shadow: var(--shadow-card);
}

.field-label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 8px;
}

.field-hint {
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: 0.82rem;
}

.text-input {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 11px 14px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-bg);
  color: var(--color-text);
  margin-bottom: 22px;
}

.text-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 15%, transparent);
}

.interest-group {
  border: none;
  padding: 0;
  margin: 0 0 22px;
}

.interest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 8px;
}

.interest-check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.interest-check:hover {
  border-color: var(--color-accent);
  background: var(--color-bg);
}

.interest-check input {
  accent-color: var(--color-primary);
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.subscribe-submit {
  width: 100%;
  border: none;
  font-size: 0.95rem;
  padding: 12px 14px;
}

.form-note {
  margin: 12px 0 0;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* ---------- Thank-you page ---------- */

.thank-you-hero {
  padding: 72px 24px;
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.thank-you-hero .check-badge {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.8rem;
}

.thank-you-hero h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--color-primary-dark);
  margin-bottom: 10px;
}

.thank-you-hero p {
  color: var(--color-text-muted);
}

.survey-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 28px;
  text-align: left;
}

.survey-card h2 {
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.survey-card p {
  font-size: 0.9rem;
  margin-bottom: 16px;
}

/* ---------- Homepage stats counter ---------- */

.stats-counter {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 18px;
  padding-bottom: 48px;
}

.stat-tile {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px 16px;
  text-align: center;
}

.stat-number {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  color: var(--color-primary-dark);
  line-height: 1.1;
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ---------- Our Mission page ---------- */

.mission-hero {
  padding: 56px 0 8px;
  text-align: center;
}

.mission-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  color: var(--color-primary-dark);
}

.mission-hero .lede {
  color: var(--color-text-muted);
}

.mission-content {
  max-width: 720px;
  padding: 32px 24px 80px;
}

.mission-block {
  margin-bottom: 40px;
}

.mission-block h2 {
  font-size: 1.3rem;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.mission-block p {
  color: var(--color-text);
  margin-bottom: 14px;
}

.partner-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 26px;
  box-shadow: var(--shadow-card);
}

.partner-block h2 {
  margin-bottom: 14px;
}

/* ---------- Blog ---------- */

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 22px;
  padding-bottom: 72px;
}

.blog-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 22px 24px 24px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent);
}

.blog-card h3 {
  font-size: 1.15rem;
  margin: 10px 0 8px;
  color: var(--color-text);
}

.blog-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.blog-card-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary-dark);
}

.post-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
  background: color-mix(in srgb, var(--color-primary) 12%, white);
  border-radius: 999px;
  padding: 3px 10px;
}

.post-hero {
  padding: 48px 0 8px;
  max-width: 720px;
}

.post-hero h1 {
  font-size: clamp(1.7rem, 4vw, 2.2rem);
  color: var(--color-primary-dark);
  margin: 14px 0 6px;
}

.post-meta {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.post-content {
  max-width: 720px;
  padding: 24px 24px 80px;
}

.post-content h2 {
  font-size: 1.3rem;
  color: var(--color-primary-dark);
  margin: 32px 0 12px;
}

.post-content p {
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.7;
}

.post-list {
  margin: 0 0 20px;
  padding-left: 22px;
  color: var(--color-text);
  line-height: 1.8;
}

.post-list li {
  margin-bottom: 4px;
}

.post-back {
  margin-top: 40px;
  font-weight: 600;
}

.post-content a,
.mission-block a {
  color: var(--color-primary-dark);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 600;
}

.post-content a:hover,
.mission-block a:hover {
  color: var(--color-accent);
}

.post-back a {
  color: var(--color-primary-dark);
  text-decoration: none;
}

.post-back a:hover {
  text-decoration: underline;
}