/* =============================================
   STEMBridge Stats — Main Stylesheet
   Brand: Forest Green #1a5c2a · Gold #f5c518 · Cream #fafaf7
   ============================================= */

@import url("https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700;800;900&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap");

/* ── CSS Variables ── */
:root {
  --bg: #fafaf7;
  --bg-card: #ffffff;
  --bg-alt: #f0f4f1;
  --bg-gold: #fffbea;

  --text: #111a13;
  --text-muted: #4a6352;

  --accent: #1a5c2a;
  --accent-h: #144821;
  --accent-2: #2e7d46;
  --accent-3: #f5c518;
  --accent-4: #e6b800;
  --accent-5: #22863a;

  --danger: #c0392b;

  --border: #d6e4da;
  --border-gold: #f0d44a;

  --shadow: 0 2px 12px rgba(26, 92, 42, 0.08);
  --shadow-lg: 0 8px 32px rgba(26, 92, 42, 0.14);
  --shadow-gold: 0 4px 20px rgba(245, 197, 24, 0.25);

  --radius: 12px;
  --radius-lg: 20px;

  --font-head: "Playfair Display", Georgia, serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Courier New", monospace;

  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);

  /* Nav height token — mobile-menu top uses this */
  --nav-h: 67px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}

/* ── Typography ── */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-head);
  line-height: 1.2;
  color: var(--text);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
}
h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.4rem);
  font-weight: 800;
}
h3 {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 700;
}
h4 {
  font-size: 1.1rem;
  font-weight: 700;
}

p {
  color: var(--text-muted);
  max-width: 70ch;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--accent-2);
}

/* ── Layout ── */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}
.section-sm {
  padding: 48px 0;
}

/* ══════════════════════════════════════════════
   NAVIGATION
══════════════════════════════════════════════ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--accent);
  border-bottom: 3px solid var(--accent-3);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-family: var(--font-head);
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--accent-3);
  text-decoration: none;
  transition: color var(--transition);
  white-space: nowrap;
}
.nav-logo:hover {
  color: #fff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links > li > a {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 7px 13px;
  border-radius: 8px;
  transition: all var(--transition);
  font-family: var(--font-body);
}

.nav-links > li > a:hover,
.nav-links > li > a.active {
  color: var(--accent-3);
  background: rgba(255, 255, 255, 0.1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-theme {
  display: none !important;
}

/* Hamburger */
.hamburger {
  display: none;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  transition: all var(--transition);
}

.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition);
}

/* ══════════════════════════════════════════════
   DROPDOWN MENU — Desktop
══════════════════════════════════════════════ */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.88rem;
  font-weight: 500;
  font-family: var(--font-body);
  padding: 7px 13px;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition);
}

.nav-dropdown-btn:hover,
.nav-dropdown.open .nav-dropdown-btn {
  color: var(--accent-3);
  background: rgba(255, 255, 255, 0.1);
}

.dropdown-chevron {
  transition: transform var(--transition);
  flex-shrink: 0;
}
.nav-dropdown.open .dropdown-chevron {
  transform: rotate(180deg);
}

/* The dropdown panel */
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  /* FIX: constrain width to viewport so it never overflows on narrow screens */
  width: 560px;
  max-width: calc(100vw - 32px);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 16px;
  z-index: 2000;
  flex-direction: column;
  gap: 0;
}

.nav-dropdown.open .nav-dropdown-menu {
  display: flex;
  animation: dropdownFadeIn 0.18s ease;
}

@keyframes dropdownFadeIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

.dropdown-section {
  width: 100%;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.dropdown-section:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}

.dropdown-section-label-row {
  display: block;
  width: 100%;
  padding: 4px 8px;
  margin-bottom: 8px;
}

.dropdown-section-label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-2);
  padding-bottom: 4px;
  border-bottom: 2px solid var(--accent-3);
}

.dropdown-section-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.nav-dropdown-menu a {
  display: inline-block;
  padding: 6px 12px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  border-radius: 8px;
  transition: all var(--transition);
  font-family: var(--font-body);
  white-space: nowrap;
}

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

.nav-dropdown-menu a.active {
  color: var(--accent);
  background: rgba(26, 92, 42, 0.07);
  font-weight: 600;
}

/* ══════════════════════════════════════════════
   MOBILE MENU
══════════════════════════════════════════════ */
.mobile-menu {
  display: none;
  position: fixed;
  /* FIX: use CSS var so if nav height ever changes this still tracks */
  top: var(--nav-h);
  left: 0;
  right: 0;
  /* FIX: constrain height and allow internal scroll on very short viewports */
  max-height: calc(100dvh - var(--nav-h));
  overflow-y: auto;
  z-index: 9999;
  background: var(--accent);
  border-top: 2px solid var(--accent-3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.mobile-menu.open {
  display: block;
}

.mobile-menu a {
  display: block;
  color: rgba(255, 255, 255, 0.88);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 14px 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  text-decoration: none;
}

.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--accent-3);
  background: rgba(255, 255, 255, 0.06);
}

/* ══════════════════════════════════════════════
   RESPONSIVE — hide desktop nav, show hamburger
══════════════════════════════════════════════ */
@media (max-width: 900px) {
  .nav-links {
    display: none !important;
  }
  .hamburger {
    display: flex;
  }
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-h);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(26, 92, 42, 0.35);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-alt);
  color: var(--accent);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover {
  background: var(--border);
  transform: translateY(-1px);
  color: var(--accent);
}

.btn-gold {
  background: var(--accent-3);
  color: var(--accent);
  font-weight: 700;
}
.btn-gold:hover {
  background: var(--accent-4);
  transform: translateY(-1px);
  box-shadow: var(--shadow-gold);
  color: var(--accent);
}

.btn-success {
  background: var(--accent-5);
  color: #fff;
}
.btn-success:hover {
  background: var(--accent);
  color: #fff;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
  border-radius: 12px;
}
.btn-sm {
  padding: 7px 14px;
  font-size: 0.82rem;
  border-radius: 8px;
}
.btn-full {
  width: 100%;
  justify-content: center;
}

/* FIX: suppress lift on touch devices so cards don't "stick" elevated */
@media (hover: none) {
  .btn-primary:hover,
  .btn-secondary:hover,
  .btn-gold:hover {
    transform: none;
    box-shadow: none;
  }
}

/* ── Hero ── */
.hero {
  padding: 100px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: var(--bg);
}

.hero::before {
  content: "";
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(
    ellipse,
    rgba(245, 197, 24, 0.12) 0%,
    transparent 68%
  );
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--accent-3),
    var(--accent),
    var(--accent-3)
  );
  opacity: 0.4;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(245, 197, 24, 0.15);
  color: var(--accent);
  border: 1.5px solid var(--border-gold);
  padding: 5px 16px;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 24px;
  font-family: var(--font-body);
  letter-spacing: 0.04em;
}

.hero h1 {
  margin-bottom: 20px;
}
.hero h1 em {
  font-style: normal;
  color: var(--accent);
  position: relative;
}
.hero h1 em::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  right: 0;
  height: 4px;
  background: var(--accent-3);
  border-radius: 2px;
}

.hero p {
  font-size: 1.15rem;
  margin: 0 auto 36px;
  max-width: 55ch;
}
.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 64px;
  flex-wrap: wrap;
}

.hero-stat-item {
  text-align: center;
}
.hero-stat-item .stat-num {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent);
  display: block;
}
.hero-stat-item .stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

/* FIX: only apply hover lift on pointer devices — touch taps leave cards stuck */
@media (hover: hover) {
  .card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
  }
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.tool-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 4px;
}

.tool-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
}
.tool-card p {
  font-size: 0.88rem;
  line-height: 1.5;
}

.tool-card .card-arrow {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent);
}

/* ── Grid ── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* ── Section Headers ── */
.section-header {
  text-align: center;
  margin-bottom: 52px;
}

.section-header .eyebrow {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 12px;
  display: block;
}

.section-header h2 {
  margin-bottom: 14px;
}
.section-header p {
  margin: 0 auto;
}

/* ── Tool Page ── */
.tool-page {
  padding: 48px 0 80px;
}
.tool-header {
  margin-bottom: 40px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.breadcrumb a {
  color: var(--text-muted);
}
.breadcrumb a:hover {
  color: var(--accent);
}
.breadcrumb span {
  color: var(--border);
}

.tool-header h1 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  margin-bottom: 10px;
}
.tool-header p {
  font-size: 1rem;
}

.tool-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 28px;
  align-items: start;
}

.tool-main {
  display: flex;
  flex-direction: column;
  gap: 24px;
  /* FIX: prevent main column from overflowing on narrow screens */
  min-width: 0;
}
.tool-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

/* ── Inputs ── */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}
.input-group label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
}
.input-group .hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

input[type="text"],
input[type="number"],
input[type="email"],
textarea,
select {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: all var(--transition);
  outline: none;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26, 92, 42, 0.12);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

/* ── Result Box ── */
.result-box {
  background: var(--bg-alt);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 8px;
}
.result-box.success {
  border-color: var(--accent);
  background: rgba(26, 92, 42, 0.05);
}
.result-box.error {
  border-color: var(--danger);
  background: rgba(192, 57, 43, 0.05);
}

.result-title {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.result-main {
  font-family: var(--font-head);
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 8px;
}

.result-grid {
  display: grid;
  /* FIX: consistent 3-column cap; min 100px prevents single-column on wide screens */
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.result-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
}

.result-item .label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.result-item .value {
  font-family: var(--font-head);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--accent);
}

/* ── Steps ── */
.steps-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.steps-header {
  background: var(--accent);
  padding: 14px 20px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--accent-h);
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
}

.steps-body {
  padding: 20px;
}

.step {
  display: flex;
  gap: 14px;
  margin-bottom: 18px;
}
.step:last-child {
  margin-bottom: 0;
}

.step-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: var(--accent-3);
  color: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 800;
}

.step-content {
  flex: 1;
  /* FIX: prevent step content from overflowing its flex parent */
  min-width: 0;
}
.step-content p {
  font-size: 0.9rem;
  max-width: none;
  color: var(--text);
}
.step-content code {
  display: block;
  margin-top: 8px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  /* FIX: add max-width so code blocks can't push layout wider than the column */
  overflow-x: auto;
  max-width: 100%;
  word-break: break-word;
}

/* ── Formula Box ── */
.formula-box {
  background: var(--bg-gold);
  border-left: 4px solid var(--accent-3);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  margin: 16px 0;
  overflow-x: auto;
}

/* ── Chart Container ── */
.chart-container {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  overflow: hidden;
}
.chart-container canvas {
  max-width: 100%;
  border-radius: 8px;
}

/* ── Tags ── */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--bg-alt);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.tag-blue {
  background: rgba(26, 92, 42, 0.08);
  color: var(--accent);
  border-color: rgba(26, 92, 42, 0.2);
}
.tag-green {
  background: rgba(34, 134, 58, 0.1);
  color: var(--accent-5);
  border-color: rgba(34, 134, 58, 0.2);
}
.tag-amber {
  background: rgba(245, 197, 24, 0.15);
  color: #7a5800;
  border-color: var(--border-gold);
}

/* ── Alert ── */
.alert {
  padding: 14px 18px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.alert-info {
  background: rgba(26, 92, 42, 0.07);
  border: 1px solid rgba(26, 92, 42, 0.2);
  color: var(--text);
}
.alert-success {
  background: rgba(245, 197, 24, 0.12);
  border: 1px solid var(--border-gold);
  color: var(--text);
}
.alert-warn {
  background: rgba(245, 197, 24, 0.18);
  border: 1px solid var(--border-gold);
  color: var(--text);
}
.alert-error {
  background: rgba(192, 57, 43, 0.07);
  border: 1px solid rgba(192, 57, 43, 0.25);
  color: var(--text);
}

/* ── Footer ── */
.footer {
  background: var(--accent);
  border-top: 3px solid var(--accent-3);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--accent-3);
}
.footer-brand-link {
  text-decoration: none;
  color: var(--accent-3);
  display: inline-block;
}
.footer-brand-link:hover {
  color: #fff;
}
.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  max-width: none;
}

.footer-col h4 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-3);
  margin-bottom: 14px;
  font-family: var(--font-body);
}
.footer-col ul {
  list-style: none;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
}
.footer-col ul li a:hover {
  color: var(--accent-3);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.footer-bottom p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
  margin: 0;
}
.footer-bottom a {
  color: rgba(255, 255, 255, 0.55) !important;
}
.footer-bottom a:hover {
  color: var(--accent-3) !important;
}

/* ── Ad Placeholder ── */
.ad-placeholder {
  background: var(--bg-gold);
  border: 2px dashed var(--border-gold);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ── Tabs ── */
.tabs {
  display: flex;
  gap: 6px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 24px;
  /* FIX: allow tab row to scroll horizontally on narrow screens */
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  background: none;
  border: none;
  padding: 10px 18px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition);
  border-radius: 8px 8px 0 0;
  /* FIX: prevent tab labels from wrapping and breaking the tab bar */
  white-space: nowrap;
  flex-shrink: 0;
}
.tab-btn:hover {
  color: var(--text);
  background: var(--bg-alt);
}
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent-3);
}

.tab-pane {
  display: none;
}
.tab-pane.active {
  display: block;
}

/* ── Table ── */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
table {
  width: 100%;
  /* FIX: set a sensible min-width so the table scrolls rather than collapsing */
  min-width: 400px;
  border-collapse: collapse;
  font-size: 0.9rem;
}
thead {
  background: var(--accent);
}
th {
  padding: 12px 16px;
  text-align: left;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.9);
  white-space: nowrap;
}
td {
  padding: 11px 16px;
  border-top: 1px solid var(--border);
  color: var(--text);
}
tr:hover td {
  background: var(--bg-alt);
}
.mono {
  font-family: var(--font-mono);
}

/* ── FAQ ── */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 10px;
}

.faq-q {
  width: 100%;
  background: var(--bg-card);
  border: none;
  padding: 16px 20px;
  text-align: left;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: background var(--transition);
}
.faq-q:hover {
  background: var(--bg-alt);
}
.faq-q span.icon {
  font-size: 1.1rem;
  transition: transform var(--transition);
  flex-shrink: 0;
}
.faq-q.open span.icon {
  transform: rotate(45deg);
}

.faq-a {
  display: none;
  padding: 0 20px 16px;
  font-size: 0.9rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border-top: 2px solid var(--accent-3);
  line-height: 1.7;
}
.faq-a.open {
  display: block;
  padding-top: 14px;
}

/* ── Category Nav ── */
.cat-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.cat-btn {
  padding: 7px 16px;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
}
.cat-btn:hover,
.cat-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ── Copy Button ── */
.copy-btn {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.copy-btn:hover {
  background: var(--border);
  color: var(--text);
}
.copy-btn.copied {
  color: var(--accent);
  border-color: var(--accent);
}

/* ── Related Tools ── */
.related-tools {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.related-tool-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  transition: all var(--transition);
}
.related-tool-link:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.related-tool-link .ricon {
  font-size: 1.1rem;
}

/* ── Curriculum Tags ── */
.curriculum-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

/* ── Spinner ── */
.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ── Highlights ── */
.hl {
  color: var(--accent);
  font-weight: 700;
}
.hl-green {
  color: var(--accent-5);
  font-weight: 700;
}
.hl-amber {
  color: #7a5800;
  font-weight: 700;
}

/* ── Utilities ── */
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-2 {
  gap: 8px;
}
.gap-3 {
  gap: 12px;
}
.gap-4 {
  gap: 16px;
}
.mt-2 {
  margin-top: 8px;
}
.mt-3 {
  margin-top: 12px;
}
.mt-4 {
  margin-top: 16px;
}
.mb-2 {
  margin-bottom: 8px;
}
.mb-3 {
  margin-bottom: 12px;
}
/* FIX: mb-4 was missing from original stylesheet */
.mb-4 {
  margin-bottom: 16px;
}
.text-center {
  text-align: center;
}
.text-right {
  text-align: right;
}
.text-sm {
  font-size: 0.85rem;
}
.text-muted {
  color: var(--text-muted);
}
.font-mono {
  font-family: var(--font-mono);
}
.hidden {
  display: none !important;
}
.w-full {
  width: 100%;
}

/* ══════════════════════════════════════════════
   RESPONSIVE BREAKPOINTS
══════════════════════════════════════════════ */

/* ── 1024px — tablet landscape ── */
@media (max-width: 1024px) {
  .tool-layout {
    grid-template-columns: 1fr;
  }
  /* FIX: sidebar is now full-width; cap its card width so it doesn't stretch */
  .tool-sidebar {
    max-width: 600px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ── 768px — tablet portrait ── */
@media (max-width: 768px) {
  /* FIX: reduce section padding on mobile */
  .section {
    padding: 56px 0;
  }
  .section-sm {
    padding: 36px 0;
  }
  /* FIX: reduce tool-page top/bottom padding */
  .tool-page {
    padding: 32px 0 60px;
  }

  .hero {
    padding: 64px 0 60px;
  }
  .hero-stats {
    gap: 28px;
  }
  /* FIX: grid-2 collapses to single column on tablet portrait */
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .result-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  /* FIX: card padding reduced on small screens */
  .card {
    padding: 20px;
  }
}

/* ── 480px — mobile ── */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .hero h1 {
    font-size: 1.9rem;
  }
  .hero-stats {
    gap: 20px;
  }
  .result-main {
    font-size: 1.8rem;
  }
  /* FIX: result-grid forced to 2 columns minimum on small mobile */
  .result-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  /* FIX: tighter card padding on small mobile */
  .card {
    padding: 16px;
  }
  /* FIX: reduce tool-page padding further on small mobile */
  .tool-page {
    padding: 24px 0 48px;
  }
  /* FIX: sidebar no longer needs a max-width cap at this size */
  .tool-sidebar {
    max-width: none;
  }
  /* FIX: step code blocks become scrollable on very small screens */
  .step-content code {
    font-size: 0.78rem;
  }
  /* FIX: footer bottom stacks at small sizes */
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}

/* ── Page Hero (About / Contact / Privacy) ── */
.page-hero {
  background: var(--accent);
  border-bottom: 3px solid var(--accent-3);
  padding: 60px 0;
  text-align: center;
}
.page-hero h1 {
  margin-bottom: 12px;
  color: #fff;
}
.page-hero p {
  color: rgba(255, 255, 255, 0.75);
  text-align: center;
  margin: 0 auto;
}
.page-hero .hero-badge {
  background: rgba(245, 197, 24, 0.2);
  color: var(--accent-3);
  border-color: rgba(245, 197, 24, 0.4);
}

/* Prose */
.prose {
  max-width: 800px;
  margin: 0 auto;
}
.prose h2 {
  margin: 40px 0 16px;
}
.prose h3 {
  margin: 28px 0 12px;
}
.prose p {
  margin-bottom: 16px;
  max-width: none;
  color: var(--text);
  line-height: 1.75;
}
.prose ul,
.prose ol {
  margin: 12px 0 20px 24px;
}
.prose li {
  margin-bottom: 8px;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.65;
}
.prose a {
  color: var(--accent);
}

/* Contact form */
.contact-form {
  max-width: 600px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* Stripe divider */
.stripe-gold {
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--accent-3), transparent);
  border: none;
  margin: 0;
}