/* =============================================================
   Học Tiếng Anh Cùng Con — Main Stylesheet
   Font: Nunito (rounded, hỗ trợ tiếng Việt đầy đủ)
   Phong cách: Cambly Kids–inspired · Warm earth tones · Playful
   ============================================================= */

/* ── Custom Properties ─────────────────────────────────────── */
:root {
  /* Brand — warm orange palette */
  --primary:        #FF8F57;   /* Cambly orange */
  --primary-dark:   #E8733A;
  --primary-light:  #FFE0CC;
  --secondary:      #FFB47D;   /* Cambly tan */
  --secondary-dark: #D4874A;
  --secondary-light:#FFF0E3;

  /* Backgrounds — warm cream */
  --bg:             #FAF4EB;
  --bg-card:        #FFFFFF;
  --bg-alt:         #F5EEE4;
  --bg-dark:        #191142;   /* Cambly navy */

  /* Text */
  --text:           #262625;
  --text-secondary: #5E5952;
  --text-muted:     #9E9189;
  --text-on-dark:   #FFFFFF;

  /* Borders */
  --border:         #E4DBD3;
  --border-strong:  #BEB4AB;

  /* Accent colors */
  --accent-purple:  #6840A8;
  --accent-teal:    #44A6CF;
  --accent-green:   #3C7F20;

  /* Shadows — subtle, warm */
  --shadow-xs:      0 1px 4px rgba(94,89,82,.08);
  --shadow-sm:      0 2px 10px rgba(94,89,82,.10);
  --shadow:         0 4px 20px rgba(94,89,82,.12);
  --shadow-hover:   0 8px 32px rgba(255,143,87,.22);
  --shadow-card:    0 2px 12px rgba(94,89,82,.08);

  /* Radii */
  --radius-sm:      10px;
  --radius:         16px;
  --radius-lg:      24px;
  --radius-xl:      32px;
  --radius-pill:    999px;

  /* Spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  48px;
  --space-2xl: 80px;

  /* Container */
  --container-max: 1280px;
  --container-px:  24px;

  --transition: 0.2s ease;
}

/* ── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Nunito', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: 'Nunito', system-ui, sans-serif;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
}

/* ── Top Stripe ─────────────────────────────────────────────── */
.top-stripe {
  height: 4px;
  background: linear-gradient(90deg,
    #FF8F57 0%, #FFB47D 35%, #6840A8 65%, #FF8F57 100%);
  background-size: 200% 100%;
  animation: stripeScroll 5s linear infinite;
}

@keyframes stripeScroll {
  0%   { background-position: 0% 0; }
  100% { background-position: 200% 0; }
}

/* ── Container ──────────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
}

/* ── Section ────────────────────────────────────────────────── */
.section { padding: var(--space-xl) 0; }

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 12px;
}

.section-title {
  font-size: clamp(20px, 3.5vw, 26px);
  font-weight: 800;
  color: var(--text);
}

.see-all {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
  transition: color var(--transition);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 2px solid var(--primary-light);
  background: transparent;
  transition: background var(--transition), color var(--transition);
}
.see-all:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
}

/* ── Navigation ─────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250,244,235,.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1.5px solid var(--border);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
  height: 68px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-logo-dot {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 3px 10px rgba(255,143,87,.35);
  flex-shrink: 0;
}

.nav-logo-name {
  font-size: 17px;
  font-weight: 900;
  color: var(--text);
  line-height: 1.2;
  letter-spacing: -.2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
}

.nav-links a {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
  color: var(--text);
  background: var(--bg-alt);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  background: var(--primary);
  color: #fff !important;
  font-size: 15px;
  font-weight: 800;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  box-shadow: 0 3px 12px rgba(255,143,87,.4);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  flex-shrink: 0;
}

.nav-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 5px 18px rgba(255,143,87,.45);
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 30px;
  background: var(--primary);
  color: #fff;
  font-family: 'Nunito', sans-serif;
  font-size: 16px;
  font-weight: 800;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(255,143,87,.38);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  letter-spacing: .1px;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 7px 22px rgba(255,143,87,.45);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 30px;
  background: transparent;
  color: var(--text);
  font-family: 'Nunito', sans-serif;
  font-size: 16px;
  font-weight: 800;
  border-radius: var(--radius-pill);
  border: 2.5px solid var(--border-strong);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  letter-spacing: .1px;
}

.btn-outline:hover {
  border-color: var(--primary);
  background: var(--secondary-light);
  transform: translateY(-2px);
}

/* ── Hero Banner ─────────────────────────────────────────────── */
.hero {
  background: var(--bg);
  padding: 72px var(--container-px) 64px;
  position: relative;
  overflow: hidden;
}

/* Decorative blobs */
.hero::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,180,125,.25) 0%, transparent 70%);
  top: -150px;
  right: -100px;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(104,64,168,.12) 0%, transparent 70%);
  bottom: -60px;
  left: 5%;
  pointer-events: none;
}

.hero-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text { max-width: 620px; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--secondary-light);
  color: var(--secondary-dark);
  font-size: 13px;
  font-weight: 800;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 22px;
  border: 1.5px solid #F5CEAD;
  letter-spacing: .2px;
}

.hero-text h1 {
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 900;
  margin-bottom: 18px;
  color: var(--text);
  line-height: 1.15;
  letter-spacing: -.5px;
}

.hero-text h1 em {
  font-style: normal;
  color: var(--primary);
}

.hero-text p {
  font-size: clamp(15px, 2.2vw, 18px);
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 500px;
  font-weight: 500;
  line-height: 1.7;
}

.hero-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ── Stat Bar ────────────────────────────────────────────────── */
.stat-bar {
  background: var(--bg-dark);
  padding: 24px var(--container-px);
  display: flex;
  justify-content: center;
  gap: clamp(28px, 8vw, 96px);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #fff;
  min-width: 70px;
}

.stat-num {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 900;
  line-height: 1;
  color: var(--secondary);
  letter-spacing: -.5px;
}

.stat-label {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,.65);
  margin-top: 4px;
}

/* ── Card base ───────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

/* ── Category Grid ───────────────────────────────────────────── */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}

.cat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 14px 20px;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  text-align: center;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.cat-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.cat-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  margin-bottom: 12px;
  flex-shrink: 0;
  line-height: 1;
}

.cat-name {
  font-size: 18px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text);
}

.cat-count {
  font-size: 13px;
  font-weight: 600;
  margin-top: 4px;
  color: var(--text-muted);
  min-height: 2.2em;
  line-height: 1.4;
  text-align: center;
}

/* Category color variants */
.cat-blue   { background: #E8F4FD; border-color: #C5E3F7; }
.cat-blue   .cat-name { color: #0A6FA8; }
.cat-blue:hover   { border-color: #44A6CF; box-shadow: 0 6px 20px rgba(68,166,207,.2); }

.cat-green  { background: #EAF7EC; border-color: #C3E9C8; }
.cat-green  .cat-name { color: #2D7A37; }
.cat-green:hover  { border-color: #3C7F20; box-shadow: 0 6px 20px rgba(60,127,32,.18); }

.cat-orange { background: var(--secondary-light); border-color: #F5CEAD; }
.cat-orange .cat-name { color: var(--primary-dark); }
.cat-orange:hover { border-color: var(--primary); box-shadow: 0 6px 20px rgba(255,143,87,.22); }

.cat-pink   { background: #FDF0F5; border-color: #F5C8DA; }
.cat-pink   .cat-name { color: #B5295A; }
.cat-pink:hover   { border-color: #E06090; box-shadow: 0 6px 20px rgba(224,96,144,.2); }

.cat-purple { background: #F3EEF9; border-color: #D8C9EF; }
.cat-purple .cat-name { color: var(--accent-purple); }
.cat-purple:hover { border-color: var(--accent-purple); box-shadow: 0 6px 20px rgba(104,64,168,.18); }

.cat-yellow { background: #FFFAED; border-color: #FAE89A; }
.cat-yellow .cat-name { color: #9A6E00; }
.cat-yellow:hover { border-color: #F5CE40; box-shadow: 0 6px 20px rgba(245,206,64,.25); }

/* ── Post Grid & Card ────────────────────────────────────────── */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}

.post-card { display: flex; flex-direction: column; }

.post-card-thumb {
  width: 100%;
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--secondary-light), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 44px;
  overflow: hidden;
  flex-shrink: 0;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.post-card-body {
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.post-card-tag {
  display: inline-flex;
  align-self: flex-start;
  font-size: 13px;
  font-weight: 800;
  padding: 4px 12px;
  background: var(--secondary-light);
  color: var(--secondary-dark);
  border-radius: var(--radius-pill);
  letter-spacing: .3px;
  border: 1.5px solid #F5CEAD;
  text-transform: uppercase;
}

.post-card-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  line-height: 1.35;
  transition: color var(--transition);
}

.post-card:hover .post-card-title { color: var(--primary-dark); }

.post-card-meta {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

/* ── Resource Grid & Card ────────────────────────────────────── */
.res-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.res-card { display: flex; flex-direction: column; }

.res-card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.res-card-name {
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
  line-height: 1.35;
  transition: color var(--transition);
}

.res-card:hover .res-card-name { color: var(--primary-dark); }

.res-card-desc {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  line-height: 1.55;
  flex: 1;
}

.res-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}

/* ── Exercise Card ───────────────────────────────────────────── */
.ex-card { display: flex; flex-direction: column; }

.ex-card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.ex-card-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
  line-height: 1.35;
  transition: color var(--transition);
}

.ex-card:hover .ex-card-title { color: var(--primary-dark); }

.ex-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

/* ── Badges ─────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 800;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  letter-spacing: .2px;
}

.badge-free {
  background: #EAF7EC;
  color: #2D7A37;
  border: 1.5px solid #C3E9C8;
}

.badge-pro {
  background: #FFFAED;
  color: #9A6E00;
  border: 1.5px solid #FAE89A;
}

.badge-level {
  background: var(--secondary-light);
  color: var(--primary-dark);
  border: 1.5px solid #F5CEAD;
}

.badge-skill {
  background: #E8F4FD;
  color: #0A6FA8;
  border: 1.5px solid #C5E3F7;
}

.badge-age {
  background: #F3EEF9;
  color: var(--accent-purple);
  border: 1.5px solid #D8C9EF;
}

/* ── Newsletter ──────────────────────────────────────────────── */
.newsletter {
  background: var(--bg-dark);
  padding: 64px var(--container-px);
  position: relative;
  overflow: hidden; 
}

.newsletter::before {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,143,87,.15) 0%, transparent 70%);
  top: -100px;
  right: 0;
  pointer-events: none;
}

.newsletter::after {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(104,64,168,.2) 0%, transparent 70%);
  bottom: -80px;
  left: 5%;
  pointer-events: none;
}

.newsletter-inner {
  max-width: 520px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.newsletter-inner h3 {
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 900;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: -.3px;
}

.newsletter-inner p {
  font-size: 15px;
  font-weight: 500;
  color: rgba(255,255,255,.72);
  margin-bottom: 28px;
  line-height: 1.65;
}

.newsletter-form { display: flex; flex-direction: column; gap: 12px; }

.newsletter-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.newsletter-input {
  flex: 1;
  min-width: 220px;
  padding: 13px 20px;
  border-radius: var(--radius-pill);
  border: 2px solid rgba(255,255,255,.2);
  background: rgba(255,255,255,.1);
  font-family: 'Nunito', sans-serif;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}

.newsletter-input:focus {
  border-color: var(--primary);
  background: rgba(255,255,255,.15);
}

.newsletter-input::placeholder { color: rgba(255,255,255,.45); }

/* ── Filter Bar ──────────────────────────────────────────────── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.filter-pill {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 700;
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1.5px solid var(--border);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.filter-pill:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
  background: var(--secondary-light);
  transform: translateY(-1px);
}

.filter-pill.active {
  background: var(--bg-dark);
  color: #fff;
  border-color: var(--bg-dark);
}

/* ── Breadcrumb ──────────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  padding: 14px 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--primary-dark);
  font-weight: 700;
  transition: color var(--transition);
}

.breadcrumb a:hover { color: var(--primary); }

.breadcrumb-sep {
  color: var(--border-strong);
  font-size: 14px;
}

/* ── Pagination ──────────────────────────────────────────────── */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  padding: 32px 0 8px;
  flex-wrap: wrap;
}

.page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 800;
  border: 2px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.page-btn:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
  transform: translateY(-1px);
}

.page-btn.active {
  background: var(--bg-dark);
  color: #fff;
  border-color: var(--bg-dark);
  box-shadow: 0 3px 12px rgba(25,17,66,.3);
}

/* ── Empty State ─────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 64px 20px;
}

.empty-state-icon {
  font-size: 60px;
  margin-bottom: 18px;
}

.empty-state h3 {
  font-size: 22px;
  margin-bottom: 8px;
  color: var(--text);
}

.empty-state p {
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 500;
}

/* ── Footer Wave Divider ─────────────────────────────────────── */
.footer-wave {
  position: relative;
  background: var(--bg);
  line-height: 0;
  margin-top: var(--space-2xl);
}

.footer-wave svg {
  width: 100%;
  height: 64px;
  display: block;
}

.footer-wave-icons {
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 18px;
  white-space: nowrap;
}

.footer-wave-icons span {
  font-size: 20px;
  opacity: .5;
  animation: waveIconBob 3s ease-in-out infinite;
  display: inline-block;
}

.footer-wave-icons span:nth-child(2) { animation-delay: .3s; }
.footer-wave-icons span:nth-child(3) { animation-delay: .6s; }
.footer-wave-icons span:nth-child(4) { animation-delay: .9s; }
.footer-wave-icons span:nth-child(5) { animation-delay: 1.2s; }
.footer-wave-icons span:nth-child(6) { animation-delay: 1.5s; }
.footer-wave-icons span:nth-child(7) { animation-delay: 1.8s; }
.footer-wave-icons span:nth-child(8) { animation-delay: 2.1s; }

@keyframes waveIconBob {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-5px); }
}

/* ── Footer ──────────────────────────────────────────────────── */
.footer {
  background: var(--bg-dark);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
}

/* Brand + Links row */
.footer-top {
  padding: 48px 0 36px;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 56px;
  align-items: start;
}

/* Brand column */
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-logo-name {
  font-size: 19px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -.2px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-tagline {
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,.5);
  line-height: 1.65;
  margin: 0;
}

/* Social buttons */
.footer-social {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.footer-social-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: rgba(255,255,255,.7);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1.5px solid rgba(255,255,255,.15);
  background: rgba(255,255,255,.06);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.footer-social-btn:hover {
  background: rgba(255,143,87,.18);
  color: var(--secondary);
  border-color: rgba(255,143,87,.4);
}

/* Link columns */
.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 32px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col h4 {
  font-size: 12px;
  font-weight: 800;
  color: rgba(255,255,255,.4);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.footer-col a {
  font-size: 14px;
  font-weight: 600;
  color: rgba(255,255,255,.6);
  transition: color var(--transition);
}

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

/* Bottom bar */
.footer-bottom {
  padding: 18px 0;
  border-top: 1px solid rgba(255,255,255,.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,.28);
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,.35);
  transition: color var(--transition);
}

.footer-bottom-links a:hover { color: rgba(255,255,255,.7); }

/* ── AdSense / Ad units ──────────────────────────────────────── */
.ad-unit {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-alt);
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius);
  min-height: 90px;
  overflow: hidden;
  margin: var(--space-lg) 0;
}

.ad-unit-wide  { width: 100%; min-height: 90px; }
.ad-unit-rect  { width: 100%; min-height: 280px; }

/* ── Rich-text / Article content ────────────────────────────── */
.prose {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.78;
  color: var(--text);
  max-width: 720px;
}

.prose h2 {
  font-size: clamp(18px, 3vw, 22px);
  font-weight: 800;
  color: var(--text);
  margin: 36px 0 14px;
}

.prose h3 {
  font-size: clamp(16px, 2.5vw, 19px);
  font-weight: 800;
  color: var(--text-secondary);
  margin: 26px 0 10px;
}

.prose p  { margin-bottom: 16px; }
.prose ul,
.prose ol { margin: 0 0 16px 24px; }
.prose li { margin-bottom: 6px; }

.prose strong { font-weight: 800; color: var(--text); }

.prose blockquote {
  border-left: 4px solid var(--primary);
  background: var(--secondary-light);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 22px 0;
  color: var(--text-secondary);
  font-style: italic;
  font-weight: 600;
}

.prose img {
  border-radius: var(--radius-lg);
  margin: 24px 0;
  box-shadow: var(--shadow);
}

.prose code {
  background: var(--bg-alt);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: .88em;
  font-family: 'Courier New', monospace;
  color: var(--primary-dark);
  font-weight: 700;
}

.prose pre {
  background: var(--bg-dark);
  color: var(--secondary-light);
  padding: 20px;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: 22px 0;
}

.prose a {
  color: var(--primary-dark);
  font-weight: 700;
}
.prose a:hover { color: var(--primary); }

/* ── Page layout (detail pages) ─────────────────────────────── */
.page-body {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--container-px);
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  align-items: start;
}

.page-main { min-width: 0; }

.page-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 88px;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-card);
}

.sidebar-card h4 {
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1.5px solid var(--border);
  letter-spacing: .3px;
  text-transform: uppercase;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-inner { justify-content: space-between; }

  .hero { padding: 48px var(--container-px) 40px; }
  .hero-btns { flex-direction: column; align-items: flex-start; }
  .btn-primary, .btn-outline { width: 100%; max-width: 300px; }

  .cat-grid { grid-template-columns: repeat(3, 1fr); }

  .post-grid  { grid-template-columns: 1fr; }
  .res-grid   { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }

  .footer-wave { margin-top: var(--space-xl); }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-links { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 10px; }

  .page-body { grid-template-columns: 1fr; }
  .page-sidebar { position: static; }

  .section { padding: 32px 0; }

  .newsletter { padding: 48px var(--container-px); }
  .newsletter-row { flex-direction: column; align-items: stretch; }
  .newsletter-input { min-width: unset; }
  .newsletter-row .btn-primary { width: 100%; }

  .stat-bar { gap: 24px; }
}

@media (max-width: 480px) {
  body { font-size: 15px; }
  .cat-grid { grid-template-columns: repeat(3, 1fr); }
  .filter-bar { gap: 6px; }
  .filter-pill { font-size: 12px; padding: 5px 12px; }
}

@media (min-width: 1100px) {
  .post-grid { grid-template-columns: repeat(3, 1fr); }
}