/* ==========================================================================
   TextileManufacturersHub.com — Modern SaaS / Linear-Grade Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@500;700&display=swap');

:root {
  --primary: #090d16;
  --primary-light: #1e293b;
  --accent: #2563eb;          /* Modern Electric Indigo / Blue */
  --accent-hover: #1d4ed8;
  --accent-subtle: #eff6ff;
  --accent-border: #bfdbfe;
  --accent-text: #1e40af;
  
  --warm-accent: #d97706;     /* Amber */
  --warm-subtle: #fef3c7;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #64748b;
  
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-focus: #2563eb;
  
  --success: #16a34a;
  --success-bg: #dcfce7;
  
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --shadow-subtle: 0 1px 2px 0 rgb(0 0 0 / 0.04);
  --shadow-card: 0 1px 3px 0 rgb(0 0 0 / 0.05), 0 4px 12px -2px rgb(0 0 0 / 0.03);
  --shadow-hover: 0 10px 25px -5px rgb(0 0 0 / 0.08), 0 8px 10px -6px rgb(0 0 0 / 0.04);
  
  --font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --max-w: 1200px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans) !important;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.012em;
}

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

a:hover {
  color: var(--accent-hover);
}

.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1.25rem, 4vw, 2.5rem);
  padding-right: clamp(1.25rem, 4vw, 2.5rem);
}

.skip-link {
  position: absolute;
  top: -50px;
  left: 10px;
  background: var(--primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 999;
  transition: top 0.2s;
  font-weight: 600;
}
.skip-link:focus { top: 10px; }

/* ==========================================================================
   HEADER & NAVBAR
   ========================================================================== */
.site-header {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.03em;
  text-decoration: none !important;
}

.logo-icon-badge {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo-accent {
  color: var(--accent);
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 8px;
}

@media (min-width: 992px) {
  .nav-desktop { display: flex; }
  .hamburger-btn { display: none !important; }
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  text-decoration: none !important;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background: rgba(241, 245, 249, 0.8);
}

.nav-cta {
  background: var(--primary);
  color: #ffffff !important;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  margin-left: 12px;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition);
  text-decoration: none !important;
}

.nav-cta:hover {
  background: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-card);
}

/* Hamburger & Drawer */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 42px;
  height: 42px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  gap: 5px;
}

.hamburger-line {
  width: 20px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(2) { opacity: 0; }
.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 73px;
  left: 0;
  right: 0;
  bottom: 0;
  background: #ffffff;
  padding: 1.5rem;
  overflow-y: auto;
  z-index: 49;
  border-top: 1px solid var(--border);
}

.mobile-nav-drawer.is-open { display: block; }
.mobile-nav-list { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.mobile-nav-link {
  display: flex;
  align-items: center;
  padding: 12px 14px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--primary);
  border-radius: var(--radius-sm);
  text-decoration: none !important;
}
.mobile-nav-link:hover { background: var(--bg-page); }

/* ==========================================================================
   HERO / PAGE BANNER
   ========================================================================== */
.calc-header-section {
  padding-top: clamp(2rem, 5vw, 3.5rem);
  padding-bottom: clamp(1.75rem, 4vw, 2.5rem);
  background: radial-gradient(circle at 50% 0%, #ffffff 0%, var(--bg-page) 100%);
  border-bottom: 1px solid var(--border);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 1.25rem;
  font-weight: 500;
}
.breadcrumbs a { color: var(--text-light); }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs-sep { color: #cbd5e1; }

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-subtle);
  color: var(--accent-text);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  border: 1px solid var(--accent-border);
  letter-spacing: 0.02em;
}

h1.calc-title {
  font-size: clamp(2rem, 5vw, 2.85rem);
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
  letter-spacing: -0.035em;
  margin-bottom: 0.85rem;
}

p.calc-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  color: var(--text-muted);
  max-width: 820px;
  line-height: 1.6;
}

/* ==========================================================================
   HOMEPAGE GRID & CARDS (THE FIX)
   ========================================================================== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.75rem;
  margin-top: 1rem;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

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

.tool-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.tool-icon-wrapper {
  width: 48px;
  height: 48px;
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.tool-category-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-light);
  background: var(--bg-page);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tool-title {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.35;
  letter-spacing: -0.025em;
  margin-bottom: 0.65rem;
}

.tool-title a {
  color: var(--primary);
  text-decoration: none !important;
}

.tool-title a:hover {
  color: var(--accent);
}

.tool-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 1.5rem;
}

/* Card Footer - Clean, No Overlapping! */
.tool-card-footer {
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.tool-spec-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 5px;
}

.tool-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--primary);
  color: #ffffff !important;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  text-decoration: none !important;
  white-space: nowrap;
  transition: var(--transition);
}

.tool-action-btn:hover {
  background: var(--accent);
}

/* ==========================================================================
   CALCULATOR UI & RESULT BOX
   ========================================================================== */
.main-content {
  padding-top: 2rem;
  padding-bottom: 4rem;
  flex: 1;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

@media (min-width: 960px) {
  .calc-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3.5vw, 2.25rem);
  box-shadow: var(--shadow-card);
}

.calc-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Inputs */
.form-group {
  margin-bottom: 1.35rem;
}

.form-label {
  display: block;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.form-help {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 5px;
}

.input-with-unit {
  position: relative;
  display: flex;
  align-items: center;
}

.form-input, .form-select {
  width: 100%;
  height: 50px;
  padding: 0 16px;
  font-size: 1.02rem;
  font-family: var(--font-sans);
  color: var(--text-main);
  background: #ffffff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.input-with-unit .form-input {
  padding-right: 80px;
}

.input-unit-tag {
  position: absolute;
  right: 12px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  pointer-events: none;
  background: var(--bg-page);
  padding: 5px 10px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border);
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

/* Buttons */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 50px;
  padding: 0 24px;
  font-size: 0.98rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff !important;
  flex: 1;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
  background: var(--bg-page);
  color: var(--text-muted);
  border: 1.5px solid var(--border);
}

.btn-secondary:hover {
  background: #e2e8f0;
  color: var(--primary);
}

/* Result Box */
.result-box {
  background: #ffffff;
  border: 2px solid var(--accent-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3.5vw, 2rem);
  box-shadow: var(--shadow-hover);
  position: sticky;
  top: 92px;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.result-badge {
  background: var(--accent-subtle);
  color: var(--accent-text);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--accent-border);
  letter-spacing: 0.03em;
}

.primary-result-stat {
  font-size: clamp(2.2rem, 5.5vw, 3rem);
  font-weight: 800;
  color: var(--primary);
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 0.35rem;
}

.primary-result-label {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.output-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 1.5rem;
}

.output-cell {
  background: var(--bg-page);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.output-cell-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.output-cell-val {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin-top: 3px;
}

.copy-btn {
  width: 100%;
  background: #ffffff;
  color: var(--primary);
  border: 1.5px solid var(--border);
}

.copy-btn:hover {
  border-color: var(--primary);
  background: var(--bg-page);
}

.copy-success-msg {
  display: none;
  margin-top: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--success);
  text-align: center;
}

/* ==========================================================================
   EDITORIAL / SPECIFICATION SECTIONS
   ========================================================================== */
.content-section {
  margin-top: 3rem;
}

.section-h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.steps-list {
  list-style: none;
  counter-reset: step-counter;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.steps-list li {
  counter-increment: step-counter;
  position: relative;
  padding-left: 44px;
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.steps-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 1px;
  width: 30px;
  height: 30px;
  background: var(--primary);
  color: #ffffff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.formula-box {
  background: var(--primary);
  color: #ffffff;
  padding: 1.75rem;
  border-radius: var(--radius-md);
  margin-top: 1rem;
  box-shadow: var(--shadow-card);
}

.formula-latex {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: #93c5fd;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid #1e293b;
  margin-bottom: 0.85rem;
}

.formula-notes {
  list-style: none;
  font-size: 0.92rem;
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.example-card {
  background: #ffffff;
  border-left: 4px solid var(--accent);
  padding: 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-top: 1rem;
  box-shadow: var(--shadow-subtle);
  border-top: 1px solid var(--border);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.example-scenario {
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.65rem;
}

.example-steps {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-muted);
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 0.75rem;
}

.example-conclusion {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.95rem;
}

/* Affiliate Callout */
.affiliate-partner-box {
  background: linear-gradient(135deg, #f8fafc 0%, #eff6ff 100%);
  border: 1.5px solid var(--accent-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

@media (min-width: 640px) {
  .affiliate-partner-box {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.partner-badge {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.partner-text {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--primary);
}

.partner-btn {
  background: var(--primary);
  color: #ffffff !important;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: var(--transition);
}

.partner-btn:hover {
  background: var(--accent);
}

/* FAQ */
.faq-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 1rem;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
}

.faq-question {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.faq-answer {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Related */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 1rem;
}

.related-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: var(--transition);
  text-decoration: none !important;
}

.related-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.related-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.related-card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Footer */
.site-footer {
  background: #090d16;
  color: #94a3b8;
  padding-top: 4rem;
  padding-bottom: 2.5rem;
  margin-top: auto;
  border-top: 1px solid #1e293b;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-col-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.9rem;
  text-decoration: none;
  transition: var(--transition);
}

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

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid #1e293b;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
  font-size: 0.85rem;
  color: #64748b;
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}