/* ===== CSS Variables ===== */
:root {
  --color-bg: #ffffff;
  --color-accent: #3b82f6;
  --color-accent-dark: #2563eb;
  --color-accent-light: #eff6ff;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-surface: #f8fafc;
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --shadow-lg: 0 4px 24px rgba(0,0,0,.12);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --transition: 0.2s ease;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}
img { max-width: 100%; display: block; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, textarea, select { font-family: inherit; font-size: inherit; }

/* ===== Layout ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}
.container--narrow { max-width: 760px; }

/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav__logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}
.nav__logo-icon {
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1rem;
}
.nav__links {
  display: flex;
  list-style: none;
  gap: 8px;
  align-items: center;
}
.nav__links a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}
.nav__links a:hover,
.nav__links a.active { color: var(--color-accent); background: var(--color-accent-light); }

/* Hamburger (mobile) */
.nav__toggle { display: none; }
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: none;
}
.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

@media (max-width: 768px) {
  .nav__hamburger { display: flex; }
  .nav__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 16px 20px;
    gap: 4px;
    box-shadow: var(--shadow);
  }
  .nav__links a { display: block; padding: 12px 16px; font-size: 1rem; }
  .nav__toggle:checked ~ .nav__links { display: flex; }
  .nav__toggle:checked ~ .nav__hamburger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav__toggle:checked ~ .nav__hamburger span:nth-child(2) { opacity: 0; }
  .nav__toggle:checked ~ .nav__hamburger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  min-height: 48px;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(59,130,246,.3);
}
.btn-primary:hover { background: var(--color-accent-dark); box-shadow: 0 4px 16px rgba(59,130,246,.4); }
.btn-primary:disabled { background: #94a3b8; box-shadow: none; cursor: not-allowed; transform: none; }
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover { background: var(--color-accent-light); border-color: var(--color-accent); color: var(--color-accent); }
.btn-lg { padding: 18px 36px; font-size: 1.1rem; }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, #eff6ff 0%, #ffffff 60%);
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--color-border);
}
.hero__tag {
  display: inline-block;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: 20px;
  max-width: 700px;
}
.hero p {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin-bottom: 32px;
}
.hero__cta { display: flex; gap: 16px; flex-wrap: wrap; }
.hero__trust {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.hero__trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.hero__trust-item .icon { color: var(--color-success); font-size: 1rem; }

/* ===== Tool Section ===== */
.tool-section {
  padding: 60px 0;
}
.section-header {
  margin-bottom: 40px;
}
.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 10px;
}
.section-header p { color: var(--color-text-muted); font-size: 1.05rem; }

/* Steps indicator */
.steps {
  display: flex;
  gap: 0;
  margin-bottom: 40px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}
.step {
  flex: 1;
  padding: 14px 20px;
  background: var(--color-surface);
  display: flex;
  align-items: center;
  gap: 12px;
  border-right: 1px solid var(--color-border);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
}
.step:last-child { border-right: none; }
.step.active { background: var(--color-accent-light); color: var(--color-accent); }
.step__num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-border);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
}
.step.active .step__num { background: var(--color-accent); color: #fff; }

/* Tool card */
.tool-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.tool-card__body { padding: 32px; }

/* Input tabs */
.input-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.tab-btn {
  flex: 1;
  padding: 12px 20px;
  border: none;
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  border-right: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
}
.tab-btn:last-child { border-right: none; }
.tab-btn.active { background: var(--color-accent); color: #fff; }
.tab-btn:hover:not(.active) { background: var(--color-accent-light); color: var(--color-accent); }

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

/* Form elements */
label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 0.95rem;
}
label .optional { font-weight: 400; color: var(--color-text-muted); font-size: 0.85rem; }
textarea {
  width: 100%;
  min-height: 180px;
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  resize: vertical;
  transition: border-color var(--transition);
  background: var(--color-surface);
  color: var(--color-text);
  line-height: 1.6;
}
textarea:focus { outline: none; border-color: var(--color-accent); background: #fff; box-shadow: 0 0 0 3px rgba(59,130,246,.1); }
input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
  background: var(--color-surface);
  color: var(--color-text);
}
input[type="text"]:focus,
input[type="password"]:focus {
  outline: none;
  border-color: var(--color-accent);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(59,130,246,.1);
}

/* File upload area */
.upload-area {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-sm);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
}
.upload-area:hover, .upload-area.dragover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}
.upload-area input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}
.upload-icon { font-size: 2.5rem; margin-bottom: 12px; }
.upload-area p { color: var(--color-text-muted); font-size: 0.95rem; }
.upload-area strong { color: var(--color-accent); }
.img-preview {
  margin-top: 16px;
  max-height: 200px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  display: none;
  margin-left: auto;
  margin-right: auto;
}
.img-preview.visible { display: block; }

/* API key section */
.api-key-section {
  margin-top: 24px;
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}
.api-key-row {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}
.api-key-row .field { flex: 1; }
.api-key-hint {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 8px;
}
.api-key-hint a { color: var(--color-accent); }

/* Tool actions */
.tool-actions {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.disclaimer-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 12px;
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

/* Results */
.results-section {
  margin-top: 40px;
  display: none;
}
.results-section.visible { display: block; }
.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}
.results-header h3 { font-size: 1.3rem; font-weight: 700; }
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.result-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 24px;
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
}
.result-card__icon { font-size: 1.5rem; margin-bottom: 10px; }
.result-card h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  font-weight: 600;
}
.result-card p { font-size: 1rem; line-height: 1.6; }
.result-card.full-width { grid-column: 1 / -1; }

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
}
.badge-mild { background: #dcfce7; color: #15803d; }
.badge-moderate { background: #fef3c7; color: #92400e; }
.badge-serious { background: #fee2e2; color: #991b1b; }

.side-effects-list { list-style: none; }
.side-effects-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}
.side-effects-list li:last-child { border-bottom: none; }
.warnings-list { list-style: none; }
.warnings-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}
.warnings-list li::before { content: "⚠️"; flex-shrink: 0; }

.affiliate-callout {
  margin-top: 20px;
  padding: 16px 20px;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.affiliate-callout p { margin: 0; color: var(--color-text); }
.affiliate-callout__label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin: 0;
}
.affiliate-callout__link {
  display: inline-block;
  font-weight: 600;
  color: #16a34a;
  text-decoration: none;
  font-size: 0.9rem;
}
.affiliate-callout__link:hover { text-decoration: underline; }

.result-disclaimer {
  margin-top: 24px;
  padding: 16px 20px;
  background: #fef9c3;
  border: 1px solid #fde68a;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: #78350f;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

/* Loading spinner */
.spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
.spinner.visible { display: block; }
@keyframes spin { to { transform: rotate(360deg); } }

.skeleton {
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border) 50%, var(--color-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
  border-radius: 6px;
  height: 16px;
  margin-bottom: 8px;
}
@keyframes shimmer { to { background-position: -200% 0; } }

/* Alert / banner */
.alert {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 16px;
}
.alert-info { background: var(--color-accent-light); color: #1e40af; border: 1px solid #bfdbfe; }
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.alert-success { background: #dcfce7; color: #15803d; border: 1px solid #86efac; }
.alert .close-btn { margin-left: auto; cursor: pointer; background: none; border: none; color: inherit; font-size: 1.1rem; flex-shrink: 0; padding: 0 4px; }

/* ===== Features Grid ===== */
.features {
  padding: 60px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 40px;
}
.feature-card {
  background: var(--color-bg);
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}
.feature-card__icon { font-size: 2rem; margin-bottom: 14px; }
.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 0.95rem; color: var(--color-text-muted); }

/* ===== FAQ Page ===== */
.page-hero {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--color-border);
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 800; margin-bottom: 12px; }
.page-hero p { font-size: 1.1rem; color: var(--color-text-muted); max-width: 600px; }

.faq-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  padding: 60px 0;
  align-items: start;
}
.faq-sidebar {
  position: sticky;
  top: 80px;
}
.sidebar-widget {
  background: var(--color-accent-light);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  padding: 24px;
}
.sidebar-widget h3 { font-size: 1rem; font-weight: 700; color: var(--color-accent-dark); margin-bottom: 12px; }
.sidebar-widget p { font-size: 0.92rem; color: #1e40af; margin-bottom: 16px; line-height: 1.5; }

.accordion-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
}
.accordion-btn {
  width: 100%;
  padding: 20px 24px;
  background: var(--color-bg);
  border: none;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: background var(--transition);
}
.accordion-btn:hover { background: var(--color-surface); }
.accordion-btn[aria-expanded="true"] { background: var(--color-accent-light); color: var(--color-accent-dark); }
.accordion-chevron {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  transition: transform var(--transition);
}
.accordion-btn[aria-expanded="true"] .accordion-chevron { transform: rotate(180deg); }
.accordion-panel {
  display: none;
  padding: 0 24px 20px;
  background: var(--color-bg);
  font-size: 0.97rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}
.accordion-panel.open { display: block; }
.accordion-panel p + p { margin-top: 12px; }
.abbr-table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 0.9rem; }
.abbr-table th, .abbr-table td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--color-border); }
.abbr-table th { background: var(--color-surface); font-weight: 600; }

@media (max-width: 768px) {
  .faq-layout { grid-template-columns: 1fr; }
  .faq-sidebar { position: static; }
}

/* ===== Blog ===== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
  padding: 60px 0;
}
.blog-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition), transform var(--transition);
}
.blog-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.blog-card__image {
  height: 180px;
  background: linear-gradient(135deg, var(--color-accent-light), #dbeafe);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}
.blog-card__body { padding: 24px; }
.blog-card__tag {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 8px;
}
.blog-card h3 { font-size: 1.05rem; font-weight: 700; line-height: 1.4; margin-bottom: 10px; }
.blog-card p { font-size: 0.92rem; color: var(--color-text-muted); margin-bottom: 16px; line-height: 1.6; }
.blog-card__read-more { font-size: 0.9rem; font-weight: 600; color: var(--color-accent); }

/* ===== About Page ===== */
.about-content { padding: 60px 0; }
.about-section { margin-bottom: 48px; }
.about-section h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 2px solid var(--color-accent-light); }
.about-section p { color: var(--color-text-muted); line-height: 1.8; margin-bottom: 14px; }
.how-it-works-steps { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; margin-top: 24px; }
.hiw-step { padding: 24px; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-sm); }
.hiw-step__num { width: 40px; height: 40px; border-radius: 50%; background: var(--color-accent); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 12px; }
.hiw-step h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; }
.hiw-step p { font-size: 0.9rem; color: var(--color-text-muted); }

/* ===== Footer ===== */
.footer {
  background: var(--color-text);
  color: #94a3b8;
  padding: 48px 0 24px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer__brand { }
.footer__logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  text-decoration: none;
}
.footer__logo-icon {
  width: 30px;
  height: 30px;
  background: var(--color-accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.9rem;
}
.footer__desc { font-size: 0.9rem; line-height: 1.6; max-width: 260px; }
.footer__col h4 { color: #fff; font-weight: 600; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 16px; }
.footer__col ul { list-style: none; }
.footer__col ul li { margin-bottom: 10px; }
.footer__col ul a { color: #94a3b8; font-size: 0.9rem; text-decoration: none; transition: color var(--transition); }
.footer__col ul a:hover { color: #fff; }
.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
}
.footer__legal { display: flex; gap: 20px; }
.footer__legal a { color: #94a3b8; text-decoration: none; }
.footer__legal a:hover { color: #fff; }

@media (max-width: 768px) {
  .footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
}

/* ===== Misc ===== */
.section-divider { height: 1px; background: var(--color-border); margin: 40px 0; }
.text-muted { color: var(--color-text-muted); }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mb-4 { margin-bottom: 16px; }

/* Tools nav grid (homepage) */
.tools-nav { padding: 60px 0; }
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 36px;
}
.tool-nav-card {
  display: block;
  padding: 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  box-shadow: 0 1px 4px rgba(0,0,0,.04);
}
.tool-nav-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  text-decoration: none;
}
.tool-nav-card__icon { font-size: 1.8rem; margin-bottom: 12px; }
.tool-nav-card h3 { font-size: 0.97rem; font-weight: 700; color: var(--color-text); margin-bottom: 6px; }
.tool-nav-card p { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.5; }

/* Pill tool specific */
.pill-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
}
@media (max-width: 600px) {
  .steps { flex-direction: column; }
  .step { border-right: none; border-bottom: 1px solid var(--color-border); }
  .step:last-child { border-bottom: none; }
  .result-grid { grid-template-columns: 1fr; }
  .pill-fields { grid-template-columns: 1fr; }
  .tool-actions { flex-direction: column; }
  .tool-actions .btn { width: 100%; }
  .hero { padding: 48px 0 40px; }
  .hero__cta { flex-direction: column; }
  .hero__cta .btn { width: 100%; text-align: center; }
}

@media (max-width: 1024px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

/* ===== Spoke Tool Layout (two-column with sidebar) ===== */
.spoke-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
}
@media (max-width: 1023px) {
  .spoke-layout { grid-template-columns: 1fr; }
}

/* Sticky sidebar (desktop) */
.spoke-sidebar { position: sticky; top: 84px; }
.spoke-sidebar-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.spoke-sidebar-card h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}
.spoke-sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.spoke-sidebar-link:last-child { border-bottom: none; }
.spoke-sidebar-link:hover { color: var(--color-accent); text-decoration: none; }
.spoke-sidebar-link .icon { font-size: 1.1rem; flex-shrink: 0; }

/* Mobile related-tools chips */
.spoke-related-panel { display: none; }
@media (max-width: 1023px) {
  .spoke-sidebar { display: none; }
  .spoke-related-panel {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding: 16px 0 4px;
    margin-top: 24px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .spoke-related-panel::-webkit-scrollbar { display: none; }
  .spoke-chip {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--color-text);
    background: var(--color-surface);
    white-space: nowrap;
    transition: border-color var(--transition), color var(--transition);
  }
  .spoke-chip:hover { border-color: var(--color-accent); color: var(--color-accent); text-decoration: none; }
}

/* ===== Pricing Banner ===== */
.pricing-banner {
  background: var(--color-accent-light);
  border-bottom: 1px solid #bfdbfe;
  text-align: center;
  padding: 12px 20px;
  font-size: 0.92rem;
}
.pricing-banner a { font-weight: 600; }

/* ===== Paywall blur overlay ===== */
.paywall-gate { position: relative; }
.result-blurred { filter: blur(5px); pointer-events: none; user-select: none; }
.paywall-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 0%, rgba(255,255,255,.88) 38%, #fff 62%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 36px;
  border-radius: var(--radius);
}
.paywall-overlay__lock { font-size: 2.2rem; margin-bottom: 8px; }
.paywall-overlay h3 { font-size: 1.1rem; margin-bottom: 8px; }
.paywall-overlay p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  text-align: center;
  max-width: 320px;
}

/* ===== Upgrade Modal ===== */
.upgrade-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0,0,0,.52);
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.upgrade-modal.open { display: flex; }
.upgrade-modal__box {
  background: #fff;
  border-radius: var(--radius);
  padding: 40px;
  max-width: 480px;
  width: 100%;
  position: relative;
  box-shadow: var(--shadow-lg);
}
.upgrade-modal__close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--color-text-muted);
  line-height: 1;
  padding: 4px;
}
.upgrade-modal__close:hover { color: var(--color-text); }
.upgrade-modal__heading { text-align: center; font-size: 1.35rem; margin-bottom: 6px; }
.upgrade-modal__features {
  list-style: none;
  margin: 20px 0;
}
.upgrade-modal__features li {
  padding: 9px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  gap: 10px;
  font-size: 0.95rem;
}
.upgrade-modal__features li:last-child { border-bottom: none; }
.upgrade-modal__price {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--color-accent);
  text-align: center;
  margin: 16px 0 4px;
}
.upgrade-modal__period {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.88rem;
  margin-bottom: 24px;
}

/* ===== Pricing Page ===== */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 40px;
}
@media (max-width: 768px) { .pricing-grid { grid-template-columns: 1fr; } }
.pricing-card {
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 32px;
}
.pricing-card--featured {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}
.pricing-card__tag {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: .06em;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.pricing-card__price { font-size: 2.8rem; font-weight: 800; margin: 16px 0 4px; }
.pricing-card__period { color: var(--color-text-muted); font-size: 0.9rem; margin-bottom: 28px; }
.pricing-card__features { list-style: none; margin-bottom: 28px; }
.pricing-card__features li {
  padding: 9px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  gap: 10px;
  font-size: 0.95rem;
  align-items: flex-start;
}
.pricing-card__features li:last-child { border-bottom: none; }

/* License activation */
.license-form { margin-top: 32px; }
.license-form .field { margin-bottom: 12px; }
.license-msg { font-size: 0.9rem; margin-top: 10px; display: block; }
.license-msg--success { color: var(--color-success); }
.license-msg--error { color: var(--color-danger); }

/* PRO badge in nav */
.nav__paid-badge {
  background: var(--color-accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  margin-left: 6px;
  vertical-align: middle;
  letter-spacing: .04em;
}

/* Drug interactions dynamic inputs */
.drug-inputs { display: flex; flex-direction: column; gap: 10px; }
.drug-input-row { display: flex; gap: 8px; align-items: center; }
.drug-input-row input { flex: 1; }
.drug-input-row .remove-drug {
  flex-shrink: 0;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 6px 10px;
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1;
  transition: border-color var(--transition), color var(--transition);
}
.drug-input-row .remove-drug:hover { border-color: var(--color-danger); color: var(--color-danger); }
.add-drug-btn {
  align-self: flex-start;
  margin-top: 4px;
  background: none;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  cursor: pointer;
  color: var(--color-accent);
  font-size: 0.9rem;
  transition: border-color var(--transition), background var(--transition);
}
.add-drug-btn:hover { border-color: var(--color-accent); background: var(--color-accent-light); }

/* ===== Print / PDF styles ===== */
@media print {
  .nav, .hero, .pricing-banner, .input-tabs, .api-key-section, .tool-actions,
  .disclaimer-note, .footer, .spoke-sidebar, .spoke-related-panel,
  .page-hero, .results-header button, .upgrade-modal,
  .features, .tools-nav, .steps, .section-header { display: none !important; }
  .results-section { display: block !important; }
  .result-grid { grid-template-columns: 1fr 1fr; }
  body { font-size: 14px; }
  .tool-card { box-shadow: none; border: none; }
  .result-card { break-inside: avoid; }
}

/* ===== Auth Modal ===== */
.auth-modal { display: none; position: fixed; inset: 0; z-index: 1001; background: rgba(0,0,0,.5); align-items: center; justify-content: center; }
.auth-modal.open { display: flex; }
.auth-modal__box { background: #fff; border-radius: var(--radius); padding: 40px; max-width: 420px; width: 90%; position: relative; }
.auth-modal__close { position: absolute; top: 16px; right: 16px; background: none; border: none; font-size: 1.3rem; cursor: pointer; color: var(--color-text-muted); }
.auth-modal__close:hover { color: var(--color-text); }
.auth-tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.auth-tab { flex: 1; padding: 10px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); background: none; cursor: pointer; font-size: 0.9rem; color: var(--color-text-muted); transition: var(--transition); }
.auth-tab.active { border-color: var(--color-accent); color: var(--color-accent); font-weight: 600; background: var(--color-accent-light); }
.auth-panel { display: none; flex-direction: column; gap: 10px; }
.auth-panel.active { display: flex; }
.auth-panel input { width: 100%; padding: 10px 14px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); font-size: 1rem; font-family: inherit; box-sizing: border-box; }
.auth-panel input:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(59,130,246,.15); }
.auth-divider { text-align: center; color: var(--color-text-muted); font-size: 0.85rem; margin: 16px 0; }
.auth-google-btn { width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px; border: 1px solid var(--color-border); background: #fff; }
.auth-google-btn:hover { background: var(--color-surface); }
.auth-msg { font-size: 0.88rem; margin-top: 12px; text-align: center; min-height: 1.2em; }
.auth-msg--error { color: #dc2626; }
.auth-msg--success { color: #16a34a; }

/* ===== Nav Auth Button ===== */
.nav__auth { display: flex; align-items: center; }
.nav__user-btn { background: none; border: 1px solid var(--color-border); border-radius: var(--radius-sm); padding: 6px 14px; cursor: pointer; font-size: 0.85rem; white-space: nowrap; color: var(--color-text); transition: var(--transition); }
.nav__user-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.nav__user-info { display: flex; align-items: center; gap: 10px; font-size: 0.82rem; }
.nav__user-email { color: var(--color-text-muted); max-width: 150px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }