/* ==========================================================================
   CYTHEON MEDICAL TECHNOLOGIES — A U.S.A. COMPANY
   Clean, Elegant, Spacious Design System
   ========================================================================== */

:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-base: #070B14;
  --bg-surface: #0C1322;
  --bg-surface-elevated: #131C30;
  --bg-surface-card: rgba(19, 28, 48, 0.6);
  --bg-glass: rgba(12, 19, 34, 0.85);
  --bg-glass-input: rgba(8, 13, 23, 0.9);
  
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-inverse: #070B14;
  
  --accent-cyan: #00D2FF;
  --accent-cyan-glow: rgba(0, 210, 255, 0.2);
  --accent-blue: #0284C7;
  --accent-blue-deep: #0369A1;
  --accent-teal: #14B8A6;
  --accent-emerald: #10B981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.15);
  
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.12);
  --border-accent: rgba(0, 210, 255, 0.3);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 26px;
  --radius-full: 9999px;

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  
  --max-width: 1240px;
  --nav-height: 76px;
}

[data-theme="light"] {
  --bg-base: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #F1F5F9;
  --bg-surface-card: rgba(255, 255, 255, 0.95);
  --bg-glass: rgba(255, 255, 255, 0.9);
  --bg-glass-input: #FFFFFF;
  
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --text-inverse: #FFFFFF;
  
  --accent-cyan: #0284C7;
  --accent-cyan-glow: rgba(2, 132, 199, 0.12);
  --accent-blue: #0369A1;
  --accent-blue-deep: #075985;
  --accent-teal: #0D9488;
  --accent-emerald: #059669;
  --accent-emerald-glow: rgba(5, 150, 105, 0.12);
  
  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-medium: rgba(15, 23, 42, 0.14);
  --border-accent: rgba(2, 132, 199, 0.25);
  
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  color-scheme: dark;
}

[data-theme="light"] {
  color-scheme: light;
}

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.65;
  font-size: 16px;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(ellipse 70% 40% at 50% -10%, rgba(0, 210, 255, 0.09), transparent),
    radial-gradient(circle 500px at 90% 30%, rgba(16, 185, 129, 0.04), transparent);
  background-attachment: fixed;
}

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

/* Top Announcement Bar */
.top-announcement {
  background: linear-gradient(90deg, #0369A1, #0284C7, #0D9488);
  color: #FFFFFF;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  padding: 8px 1.5rem;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  position: relative;
  z-index: 101;
}

.top-announcement .badge {
  background: rgba(0, 0, 0, 0.28);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.725rem;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-weight: 700;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  gap: 1.5rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
}

.brand-logo-img {
  height: 38px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
  display: block;
  transition: filter var(--transition-normal), transform var(--transition-fast);
}

.brand-link:hover .brand-logo-img {
  transform: scale(1.02);
}

[data-theme="dark"] .brand-logo-img {
  filter: brightness(0) invert(1) drop-shadow(0 0 10px rgba(0, 210, 255, 0.25));
}

[data-theme="light"] .brand-logo-img {
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.06));
}

.footer-brand-logo {
  height: 38px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
  display: block;
  filter: brightness(0) invert(1) drop-shadow(0 0 8px rgba(0, 210, 255, 0.2));
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.25rem;
  flex-wrap: nowrap;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
  white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-cyan);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  flex-shrink: 0;
}

.theme-toggle-btn {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--border-accent);
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 6px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #FFFFFF;
  box-shadow: 0 4px 14px var(--accent-cyan-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: var(--bg-surface);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.btn-outline:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-accent-emerald {
  background: linear-gradient(135deg, #10B981, #059669);
  color: #FFFFFF;
  box-shadow: 0 4px 14px var(--accent-emerald-glow);
}

.btn-accent-emerald:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
}

.btn-sm {
  padding: 0.42rem 0.85rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
  border-radius: var(--radius-md);
}

/* Badges */
.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
}

.badge-tag.cyan {
  background: rgba(0, 210, 255, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 210, 255, 0.25);
}

.badge-tag.emerald {
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

/* Section Header Structure - Clean, High Breathing Room */
.page-section {
  padding: clamp(5rem, 8vw, 7.5rem) 0;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto clamp(2.5rem, 5vw, 4rem) auto;
}

.section-eyebrow {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 1.6px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   HERO SECTION - Minimalist, Executive, Spacious
   ========================================================================== */
.hero-section {
  padding: clamp(4.5rem, 9vw, 8rem) 0 clamp(3.5rem, 6vw, 5.5rem);
  position: relative;
  text-align: center;
}

.hero-inner {
  max-width: 880px;
  margin: 0 auto;
}

.hero-badge-wrap {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 1.75rem;
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 4.1rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #FFFFFF 20%, var(--accent-cyan) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .hero-title .gradient-text {
  background: linear-gradient(135deg, #0F172A 20%, var(--accent-cyan) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  color: var(--text-secondary);
  margin: 0 auto 2.5rem auto;
  max-width: 720px;
  line-height: 1.65;
}

.hero-cta-group {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.hero-highlights-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border-subtle);
  max-width: 860px;
  margin: 0 auto;
}

.hero-highlight-item .val {
  font-size: clamp(1.4rem, 2.2vw, 1.9rem);
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1.1;
  margin-bottom: 4px;
}

.hero-highlight-item .label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   CARDS & GRIDS (Used across Practices, Corporations, Standards)
   ========================================================================== */
.clean-grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.clean-card {
  background: var(--bg-surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.clean-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
}

.clean-card-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  background: rgba(0, 210, 255, 0.08);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
}

.clean-card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.clean-card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.clean-card-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 1.75rem;
}

.clean-card-list li {
  font-size: 0.875rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.clean-card-list li svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
}

/* ==========================================================================
   CATALOG / MEDICAL REALM
   ========================================================================== */
.catalog-filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 2.75rem;
}

.filter-btn {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--accent-cyan);
  color: #070B14;
  border-color: var(--accent-cyan);
  font-weight: 700;
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
}

.catalog-card {
  background: var(--bg-surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.catalog-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.catalog-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.catalog-tag {
  font-size: 0.725rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--accent-cyan);
}

.catalog-badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-emerald);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.catalog-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.catalog-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.55;
  flex-grow: 1;
}

.catalog-specs-box {
  background: var(--bg-surface-elevated);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  margin-bottom: 1.5rem;
  font-size: 0.8125rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.catalog-spec-line {
  display: flex;
  justify-content: space-between;
}

.catalog-spec-line .label {
  color: var(--text-muted);
}

.catalog-spec-line .val {
  font-weight: 600;
}

.catalog-card-actions {
  display: flex;
  gap: 10px;
  margin-top: auto;
}

/* ==========================================================================
   PATENTS & INNOVATION SECTION
   ========================================================================== */
.patent-banner-clean {
  background: var(--bg-surface-card);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-xl);
  padding: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 3.5rem;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: center;
}

.patent-banner-clean h3 {
  font-size: clamp(1.5rem, 2.5vw, 2.1rem);
  font-weight: 800;
  margin-bottom: 1rem;
}

.patent-banner-clean p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.patent-stats-panel {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.9rem;
}

.patent-stats-line {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 8px;
}

.patent-stats-line:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.patent-card-clean {
  background: var(--bg-surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.patent-card-clean:hover {
  border-color: var(--accent-emerald);
  transform: translateY(-4px);
}

.patent-header-clean {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.patent-number-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.patent-footer-clean {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: auto;
}

/* ==========================================================================
   ESTIMATOR / CALCULATOR
   ========================================================================== */
.calc-clean-card {
  background: var(--bg-surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: clamp(2rem, 4vw, 3.5rem);
}

.calc-clean-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: start;
}

.calc-field-group {
  margin-bottom: 1.5rem;
}

.calc-field-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.calc-select-styled, .form-input-styled {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-glass-input);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9375rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.calc-select-styled:focus, .form-input-styled:focus {
  border-color: var(--accent-cyan);
}

.checkbox-categories-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.checkbox-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-surface-elevated);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.checkbox-chip:hover {
  border-color: var(--accent-cyan);
}

.checkbox-chip input {
  accent-color: var(--accent-cyan);
  width: 16px;
  height: 16px;
}

.calc-result-summary {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: sticky;
  top: 96px;
}

.calc-result-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.calc-result-rows {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}

.calc-result-row {
  display: flex;
  justify-content: space-between;
}

.calc-result-row .lbl {
  color: var(--text-secondary);
}

.calc-result-row .res {
  font-weight: 700;
  color: var(--accent-cyan);
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-clean-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(2rem, 5vw, 4rem);
}

.contact-info-block h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.contact-info-block p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.65;
}

.contact-channel-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-channel-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.channel-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(0, 210, 255, 0.08);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-form-box {
  background: var(--bg-surface-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: clamp(1.75rem, 3.5vw, 2.75rem);
}

.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-item {
  margin-bottom: 1.25rem;
}

.form-item label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.form-feedback {
  display: none;
  margin-top: 1rem;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.5;
}

.form-feedback.success {
  display: block;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid var(--accent-emerald);
  color: #34D399;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background: #04070D;
  color: #94A3B8;
  padding: 5rem 0 2.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.875rem;
}

.footer-columns {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  margin-bottom: 3.5rem;
}

.footer-col-title {
  color: #F8FAFC;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

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

.footer-nav-list a {
  color: #94A3B8;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-nav-list a:hover {
  color: var(--accent-cyan);
}

.footer-bottom-bar {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.8125rem;
}

/* Modal Dialog */
dialog.custom-modal {
  margin: auto;
  padding: 0;
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-xl);
  background: var(--bg-surface);
  color: var(--text-primary);
  max-width: 640px;
  width: 90vw;
  box-shadow: var(--shadow-lg), 0 0 50px rgba(0, 0, 0, 0.8);
  overflow: hidden;
}

dialog.custom-modal::backdrop {
  background: rgba(4, 7, 13, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated);
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px 8px;
}

.modal-body {
  padding: 1.75rem;
  max-height: 70vh;
  overflow-y: auto;
}

/* Responsive */
@media (max-width: 1024px) {
  .patent-banner-clean { grid-template-columns: 1fr; }
  .calc-clean-grid { grid-template-columns: 1fr; }
  .contact-clean-grid { grid-template-columns: 1fr; }
  .footer-columns { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
  .site-header.mobile-open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-medium);
    box-shadow: var(--shadow-lg);
    gap: 1rem;
  }
  .hero-highlights-strip { grid-template-columns: repeat(2, 1fr); }
  .checkbox-categories-2col { grid-template-columns: 1fr; }
  .form-row-2 { grid-template-columns: 1fr; }
  .footer-columns { grid-template-columns: 1fr; }
}