/* =====================================================
   MaxMultiTool — Global Stylesheet
   Dark Navy #0a0f1e | Electric Blue #3b82f6 | Cyan #06b6d4
   ===================================================== */

/* === Fonts === */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

/* === CSS Variables === */
:root {
  --bg-primary: #0a0f1e;
  --bg-secondary: #0d1526;
  --bg-card: #111827;
  --bg-card-hover: #1a2438;
  --border: rgba(59,130,246,0.15);
  --border-hover: rgba(59,130,246,0.4);
  --accent-blue: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-purple: #8b5cf6;
  --accent-green: #10b981;
  --text-primary: #f0f4ff;
  --text-secondary: #94a3b8;
  --text-muted: #4b5563;
  --glass-bg: rgba(17,24,39,0.7);
  --glass-border: rgba(59,130,246,0.2);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-blue: 0 0 30px rgba(59,130,246,0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --transition: 0.25s ease;
  --nav-height: 68px;
}

/* === 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-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-blue); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-cyan); }
img { max-width: 100%; display: block; }
ul { list-style: none; }
input, select, textarea, button { font-family: inherit; }

/* === Scrollbar === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-blue); border-radius: 3px; }

/* === Dot Grid Background === */
.dot-grid-bg {
  background-image: radial-gradient(circle, rgba(59,130,246,0.12) 1px, transparent 1px);
  background-size: 30px 30px;
}
.dot-grid-bg-sm {
  background-image: radial-gradient(circle, rgba(59,130,246,0.08) 1px, transparent 1px);
  background-size: 22px 22px;
}

/* === Glassmorphism Navbar === */
#main-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding: 0 2rem;
  transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
}
#main-nav.scrolled {
  background: rgba(10,15,30,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--glass-border), 0 8px 32px rgba(0,0,0,0.3);
}
.nav-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}
.nav-logo-icon {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-cta {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  color: #fff !important;
  padding: 0.5rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
}
.nav-cta:hover { opacity: 0.9; color: #fff !important; }
.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0.25rem;
}

/* === Hero Section === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem 1.5rem 5rem;
  position: relative;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 20%, rgba(59,130,246,0.18) 0%, transparent 70%),
              radial-gradient(ellipse 60% 40% at 70% 70%, rgba(6,182,212,0.1) 0%, transparent 60%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; max-width: 800px; margin: 0 auto; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.3);
  border-radius: 100px;
  padding: 0.4rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}
.hero-badge::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--accent-cyan);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, #fff 30%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 2.5rem;
  line-height: 1.75;
}
.hero-cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  color: #fff;
  padding: 0.85rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  text-decoration: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(59,130,246,0.4);
  color: #fff;
  opacity: 0.95;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--text-primary);
  padding: 0.85rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  text-decoration: none;
}
.btn-outline:hover {
  border-color: var(--accent-blue);
  background: rgba(59,130,246,0.08);
  transform: translateY(-2px);
  color: var(--text-primary);
}

/* === Floating Pills === */
.floating-pills {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 3rem;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 100px;
  padding: 0.4rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 500;
  backdrop-filter: blur(10px);
  animation: float 4s ease-in-out infinite;
}
.pill:nth-child(2) { animation-delay: 0.8s; }
.pill:nth-child(3) { animation-delay: 1.6s; }
.pill:nth-child(4) { animation-delay: 2.4s; }
.pill .pill-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-green); }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* === Section Base === */
.section {
  padding: 5rem 1.5rem;
}
.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.section-header {
  text-align: center;
  margin-bottom: 3rem;
}
.section-eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
}
.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.75rem;
}
.section-header p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto;
}

/* === Tools Grid === */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
}
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.tool-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-blue);
}
.tool-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
}
.tool-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}
.tool-card p {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.55;
}
.tool-card-arrow {
  margin-top: auto;
  font-size: 0.8rem;
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* === Category Tabs === */
.cat-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.cat-tab {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.45rem 1rem;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.cat-tab.active, .cat-tab:hover {
  background: rgba(59,130,246,0.15);
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

/* === Stats Bar === */
.stats-bar {
  display: flex;
  gap: 3rem;
  justify-content: center;
  flex-wrap: wrap;
  padding: 3rem 1.5rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stat-item { text-align: center; }
.stat-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.85rem; color: var(--text-secondary); margin-top: 0.25rem; }

/* === Feature Boxes === */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}
.feature-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1.25rem;
}
.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.feature-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.65; }

/* === Blog Cards === */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
  text-decoration: none;
  display: flex;
  flex-direction: column;
}
.blog-card:hover { border-color: var(--accent-blue); transform: translateY(-3px); }
.blog-card-thumb {
  height: 160px;
  background: linear-gradient(135deg, #111827, #1a2438);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}
.blog-card-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(17,24,39,0.8) 100%);
}
.blog-card-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
.blog-tag {
  display: inline-block;
  background: rgba(59,130,246,0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(59,130,246,0.25);
  padding: 0.2rem 0.7rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.blog-card-body h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}
.blog-card-body p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; flex: 1; }
.blog-meta { font-size: 0.78rem; color: var(--text-muted); margin-top: 1rem; }

/* === FAQ === */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 0.75rem;
}
.faq-question {
  width: 100%;
  background: var(--bg-card);
  border: none;
  color: var(--text-primary);
  padding: 1.1rem 1.5rem;
  text-align: left;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  transition: background var(--transition);
}
.faq-question:hover { background: var(--bg-card-hover); }
.faq-icon {
  width: 22px; height: 22px;
  flex-shrink: 0;
  background: rgba(59,130,246,0.15);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem;
  transition: transform var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  background: var(--bg-secondary);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 1.5rem;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 1rem 1.5rem 1.25rem; }
.faq-answer p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }

/* === Footer === */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 3.5rem 1.5rem 2rem;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}
.footer-brand p { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.7; margin-top: 0.75rem; max-width: 260px; }
.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.footer-col ul { display: flex; flex-direction: column; gap: 0.6rem; }
.footer-col ul li a { font-size: 0.88rem; color: var(--text-secondary); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--text-primary); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-bottom p { font-size: 0.82rem; color: var(--text-muted); }

/* === Tool Page Layout === */
.tool-page-hero {
  padding: calc(var(--nav-height) + 3rem) 1.5rem 3rem;
  text-align: center;
  position: relative;
}
.tool-page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.75rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #fff 40%, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.tool-page-hero p { color: var(--text-secondary); font-size: 1rem; max-width: 540px; margin: 0 auto; }

/* === Upload Zone === */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  background: var(--bg-card);
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--accent-blue);
  background: rgba(59,130,246,0.05);
}
.upload-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
}
.upload-zone h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.upload-zone p { color: var(--text-secondary); font-size: 0.85rem; }
.upload-zone input[type="file"] { display: none; }

/* === File List === */
.file-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.file-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.file-item-icon { font-size: 1.5rem; flex-shrink: 0; }
.file-item-info { flex: 1; }
.file-item-name { font-size: 0.9rem; font-weight: 500; }
.file-item-size { font-size: 0.78rem; color: var(--text-secondary); }
.file-item-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  transition: color var(--transition);
}
.file-item-remove:hover { color: #ef4444; }

/* === Progress Bar === */
.progress-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  margin-top: 1.5rem;
  display: none;
}
.progress-wrap.active { display: block; }
.progress-label { display: flex; justify-content: space-between; margin-bottom: 0.75rem; font-size: 0.88rem; }
.progress-bar-track {
  height: 6px;
  background: rgba(59,130,246,0.15);
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
}
.progress-steps {
  display: flex;
  gap: 1.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}
.progress-step { font-size: 0.82rem; color: var(--text-muted); display: flex; align-items: center; gap: 0.4rem; }
.progress-step.done { color: var(--accent-green); }
.progress-step.active { color: var(--accent-blue); }

/* === Result Box === */
.result-box {
  background: linear-gradient(135deg, rgba(16,185,129,0.08), rgba(59,130,246,0.08));
  border: 1px solid rgba(16,185,129,0.25);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  display: none;
  margin-top: 1.5rem;
}
.result-box.active { display: block; }
.result-icon { font-size: 2.5rem; margin-bottom: 1rem; }
.result-box h3 { font-family: var(--font-display); font-size: 1.25rem; font-weight: 700; margin-bottom: 0.5rem; }
.result-box p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 1.5rem; }

/* === Tool Sidebar Options === */
.tool-options {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}
.tool-options h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.option-group { margin-bottom: 1.25rem; }
.option-group label {
  display: block;
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.option-group select,
.option-group input[type="text"],
.option-group input[type="password"],
.option-group input[type="number"] {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: 8px;
  padding: 0.6rem 0.9rem;
  font-size: 0.88rem;
  transition: border-color var(--transition);
}
.option-group select:focus,
.option-group input:focus {
  outline: none;
  border-color: var(--accent-blue);
}
.range-wrap { position: relative; }
.range-wrap input[type="range"] {
  width: 100%;
  accent-color: var(--accent-blue);
  height: 4px;
  cursor: pointer;
}
.range-val {
  font-size: 0.88rem;
  color: var(--accent-cyan);
  font-weight: 600;
  margin-top: 0.25rem;
}
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}
.toggle-label { font-size: 0.88rem; color: var(--text-secondary); }
.toggle {
  position: relative;
  width: 38px; height: 20px;
  display: inline-block;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--text-muted);
  border-radius: 10px;
  transition: background var(--transition);
  cursor: pointer;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 14px; height: 14px;
  left: 3px; top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--transition);
}
.toggle input:checked + .toggle-slider { background: var(--accent-blue); }
.toggle input:checked + .toggle-slider::before { transform: translateX(18px); }

/* === Calculator Tool Styles === */
.calc-hero {
  padding: calc(var(--nav-height) + 2.5rem) 1.5rem 2.5rem;
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}
.calc-hero-inner {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.calc-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
}
.calc-hero p { color: var(--text-secondary); font-size: 1rem; max-width: 560px; }
.calc-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}
.calc-breadcrumb a { color: var(--accent-blue); }

.calc-main {
  max-width: 1060px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  align-items: start;
}
.calc-workspace {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Shape Cards in Calculator */
.shape-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}
.shape-tab {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.shape-tab.active, .shape-tab:hover {
  background: rgba(59,130,246,0.15);
  border-color: var(--accent-blue);
  color: var(--text-primary);
}
.shape-panel { display: none; }
.shape-panel.active { display: block; }

.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}
.calc-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.calc-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.calc-form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.calc-form-group.full { grid-column: 1 / -1; }
.calc-form-group label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.calc-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.calc-input-wrap input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: 8px;
  padding: 0.65rem 2.5rem 0.65rem 0.9rem;
  font-size: 0.95rem;
  transition: border-color var(--transition);
}
.calc-input-wrap input:focus { outline: none; border-color: var(--accent-blue); }
.calc-input-unit {
  position: absolute;
  right: 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  pointer-events: none;
}
.calc-input-wrap select {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: 8px;
  padding: 0.65rem 0.9rem;
  font-size: 0.95rem;
  transition: border-color var(--transition);
  cursor: pointer;
}
.calc-input-wrap select:focus { outline: none; border-color: var(--accent-blue); }

.calc-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}
.btn-calc {
  flex: 1;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.85rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
}
.btn-calc:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-clear {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-clear:hover { border-color: var(--accent-blue); color: var(--text-primary); }

/* Result Panel */
.calc-result-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  position: sticky;
  top: calc(var(--nav-height) + 1rem);
}
.calc-result-panel h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.result-primary {
  background: linear-gradient(135deg, rgba(59,130,246,0.1), rgba(6,182,212,0.08));
  border: 1px solid rgba(59,130,246,0.25);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  margin-bottom: 1.25rem;
}
.result-primary-value {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.result-primary-label { font-size: 0.82rem; color: var(--text-secondary); margin-top: 0.35rem; }
.result-rows { display: flex; flex-direction: column; gap: 0.6rem; }
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
}
.result-row:last-child { border-bottom: none; }
.result-row-label { color: var(--text-secondary); }
.result-row-val { font-weight: 600; color: var(--text-primary); }
.result-empty {
  text-align: center;
  padding: 2rem 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}
.result-empty-icon { font-size: 2rem; margin-bottom: 0.75rem; }

/* Shape Visual */
.shape-visual {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  margin-bottom: 1.25rem;
}
.shape-svg { max-width: 160px; height: auto; display: block; margin: 0 auto; }

/* Info Cards */
.calc-info-section {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.info-card h4 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--accent-cyan);
}
.info-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.65; }
.formula-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-family: 'Courier New', monospace;
  font-size: 0.88rem;
  color: var(--accent-cyan);
  margin: 0.5rem 0;
  overflow-x: auto;
}

/* === Responsive === */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-mobile-toggle { display: block; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: rgba(10,15,30,0.95);
    backdrop-filter: blur(20px);
    padding: 1.5rem;
    gap: 1.25rem;
    border-bottom: 1px solid var(--border);
  }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .calc-main { grid-template-columns: 1fr; }
  .calc-result-panel { position: static; }
  .calc-form-grid { grid-template-columns: 1fr; }
  .stats-bar { gap: 1.5rem; }
  .hero { padding: 7rem 1.25rem 4rem; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
  .hero-cta-group { flex-direction: column; align-items: center; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
}

/* === Utility === */
.text-gradient {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.badge {
  display: inline-block;
  background: rgba(59,130,246,0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(59,130,246,0.25);
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
}
.badge-green { background: rgba(16,185,129,0.12); color: var(--accent-green); border-color: rgba(16,185,129,0.25); }
.badge-cyan { background: rgba(6,182,212,0.12); color: var(--accent-cyan); border-color: rgba(6,182,212,0.25); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.hidden { display: none !important; }