/* ============================================================
   Keelcleaning - Underwater Drone Single-Page Website
   CSS Design System & Styles
   ============================================================ */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Outfit:wght@300;400;500;600;700;800;900&display=swap');

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Colors - Grayscale Palette */
  --color-deep-ocean: #111111;
  --color-navy: #1a1a1a;
  --color-marine-dark: #222222;
  --color-marine: #333333;
  --color-marine-light: #555555;
  --color-teal: #888888;
  --color-teal-light: #aaaaaa;
  --color-aqua: #0abab5; /* Tiffany */
  --color-aqua-glow: #15d4ce; /* Bright Tiffany */
  --color-sky: #dddddd;
  --color-white: #ffffff;
  --color-off-white: #f5f5f5;
  --color-light-gray: #eeeeee;
  --color-text: #dddddd;
  --color-text-muted: #999999;
  --color-accent-gold: #f0c040;
  
  /* Gradients */
  --gradient-ocean: linear-gradient(180deg, #111111 0%, #222222 50%, #111111 100%);
  --gradient-hero: linear-gradient(135deg, rgba(17,17,17,0.92) 0%, rgba(26,26,26,0.85) 50%, rgba(34,34,34,0.78) 100%);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0.02) 100%);
  --gradient-cta: linear-gradient(135deg, #0abab5 0%, #15d4ce 50%, #0abab5 100%);
  --gradient-cta-hover: linear-gradient(135deg, #444444 0%, #555555 50%, #666666 100%);
  --gradient-text: linear-gradient(135deg, #dddddd 0%, #0abab5 50%, #15d4ce 100%);
  
  /* Typography */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --fs-hero: clamp(2.8rem, 6vw, 5.5rem);
  --fs-h1: clamp(2.2rem, 4.5vw, 4rem);
  --fs-h2: clamp(1.8rem, 3.5vw, 3rem);
  --fs-h3: clamp(1.3rem, 2.5vw, 1.8rem);
  --fs-body: clamp(0.95rem, 1.2vw, 1.125rem);
  --fs-small: clamp(0.8rem, 1vw, 0.9rem);
  --fs-label: clamp(0.7rem, 0.9vw, 0.8rem);
  --lh-heading: 1.15;
  --lh-body: 1.7;
  --fw-light: 300;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;
  --fw-black: 900;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;
  --space-section: clamp(5rem, 10vh, 8rem);
  
  /* Layout */
  --max-width: 1280px;
  --max-width-narrow: 900px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  
  /* Effects */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.15);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.25);
  --shadow-lg: 0 16px 64px rgba(0,0,0,0.35);
  --shadow-glow: 0 0 30px rgba(10, 186, 181, 0.4);
  --shadow-glow-strong: 0 0 60px rgba(10, 186, 181, 0.6);
  --blur-glass: 20px;
  --blur-glass-heavy: 40px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scrollbar-width: thin;
  scrollbar-color: var(--color-marine-light) var(--color-deep-ocean);
  overflow-x: hidden;
  width: 100vw;
}

html::-webkit-scrollbar {
  width: 8px;
}

html::-webkit-scrollbar-track {
  background: var(--color-deep-ocean);
}

html::-webkit-scrollbar-thumb {
  background: var(--color-marine-light);
  border-radius: var(--radius-full);
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--color-text);
  background-color: var(--color-deep-ocean);
  overflow-x: hidden;
  width: 100%;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--color-aqua-glow);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: var(--lh-heading);
  color: var(--color-white);
}

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: var(--fs-label);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-aqua);
  margin-bottom: var(--space-md);
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 2px;
  background: var(--color-aqua);
}

.section-title {
  font-size: var(--fs-h1);
  font-weight: var(--fw-extrabold);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: var(--fs-body);
  color: var(--color-text-muted);
  max-width: 650px;
  line-height: var(--lh-body);
}

/* --- Glass Card Component --- */
.glass-card {
  background: var(--gradient-card);
  backdrop-filter: blur(var(--blur-glass));
  -webkit-backdrop-filter: blur(var(--blur-glass));
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(255,255,255,0.15);
}

/* --- CTA Button Component --- */
.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.25rem;
  background: var(--gradient-cta);
  color: var(--color-deep-ocean);
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: var(--fs-body);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  text-decoration: none;
  z-index: 1;
}

.cta-button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-cta-hover);
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: -1;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255,255,255,0.35);
  color: var(--color-deep-ocean);
}

.cta-button:hover::before {
  opacity: 1;
}

.cta-button--outline {
  background: transparent;
  border: 2px solid rgba(255,255,255,0.5);
  color: var(--color-aqua);
}

.cta-button--outline::before {
  background: rgba(255,255,255,0.1);
}

.cta-button--outline:hover {
  color: var(--color-white);
  border-color: var(--color-aqua);
}

.cta-button .arrow {
  transition: transform var(--transition-fast);
}

.cta-button:hover .arrow {
  transform: translateX(4px);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.25rem 0;
  transition: background var(--transition-base), padding var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
  background: rgba(17,17,17,0.92);
  backdrop-filter: blur(var(--blur-glass-heavy));
  -webkit-backdrop-filter: blur(var(--blur-glass-heavy));
  padding: 0.75rem 0;
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-weight: var(--fw-black);
  font-size: 1.5rem;
  color: var(--color-white);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.navbar__logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-cta);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.navbar__links {
  display: none;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.navbar__links a {
  font-family: var(--font-heading);
  font-weight: var(--fw-medium);
  font-size: 0.875rem;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  position: relative;
  padding: 0.25rem 0;
}

.navbar__links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-aqua);
  transition: width var(--transition-base);
}

.navbar__links a:hover::after,
.navbar__links a.active::after {
  width: 100%;
}

.navbar__links a:hover {
  color: var(--color-white);
}

.navbar__cta {
  display: none;
}

.navbar__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.navbar__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.navbar__toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.navbar__toggle.active span:nth-child(2) {
  opacity: 0;
}

.navbar__toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100vh;
  background: rgba(17,17,17,0.98);
  backdrop-filter: blur(var(--blur-glass-heavy));
  -webkit-backdrop-filter: blur(var(--blur-glass-heavy));
  z-index: 999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition: right var(--transition-smooth);
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu__links {
  list-style: none;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.mobile-menu__links a {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 1.5rem;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
}

.mobile-menu__links a:hover {
  color: var(--color-aqua);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: 
    linear-gradient(to bottom, transparent 60%, var(--color-deep-ocean) 100%),
    var(--gradient-hero);
  z-index: 1;
}

.site-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 10;
  pointer-events: none;
  overflow: hidden;
}

.hero__particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(255,255,255,0.4);
  border-radius: 50%;
  animation: float-up linear infinite;
}

@keyframes float-up {
  0% {
    top: 100%;
    transform: scale(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    top: -5%;
    transform: scale(1);
    opacity: 0;
  }
}

.hero__content {
  position: relative;
  z-index: 3;
  width: 100%;
  padding-top: 6rem;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  font-weight: var(--fw-semibold);
  color: var(--color-aqua);
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero__badge .pulse {
  width: 8px;
  height: 8px;
  background: var(--color-aqua);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.hero__title {
  font-size: var(--fs-hero);
  font-weight: var(--fw-black);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero__subtitle {
  font-size: clamp(1.05rem, 1.5vw, 1.3rem);
  color: var(--color-text);
  max-width: 600px;
  margin-bottom: var(--space-xl);
  line-height: 1.6;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  animation: fadeInUp 0.8s ease-out 0.8s both;
}

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  animation: fadeInUp 0.8s ease-out 1.2s both;
}

.hero__scroll span {
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-muted);
}

.hero__scroll-indicator {
  width: 24px;
  height: 40px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 12px;
  position: relative;
}

.hero__scroll-indicator::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--color-aqua);
  border-radius: 2px;
  animation: scroll-dot 2s ease-in-out infinite;
}

@keyframes scroll-dot {
  0%, 100% { top: 6px; opacity: 1; }
  50% { top: 20px; opacity: 0.3; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Parallax Divider Sections --- */
.parallax-divider {
  position: relative;
  height: 50vh;
  min-height: 350px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.parallax-divider__bg {
  position: absolute;
  inset: -20%;
  z-index: 0;
}

.parallax-divider__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.parallax-divider__overlay {
  position: absolute;
  inset: 0;
  background: rgba(17,17,17,0.6);
  z-index: 1;
}

.parallax-divider__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: var(--space-xl);
}

.parallax-divider__quote {
  font-family: var(--font-heading);
  font-size: var(--fs-h2);
  font-weight: var(--fw-bold);
  color: var(--color-white);
  max-width: 700px;
  letter-spacing: -0.02em;
}

/* --- Technology Section --- */
.technology {
  padding: var(--space-section) 0;
  position: relative;
  background: var(--gradient-ocean);
}

.technology__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
  margin-top: var(--space-2xl);
}

.technology__image {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.technology__image img {
  width: 100%;
  height: auto;
  transition: transform var(--transition-slow);
}

.technology__image:hover img {
  transform: scale(1.03);
}

.technology__image::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255,255,255,0.15);
  pointer-events: none;
}

.technology__features {
  display: grid;
  gap: var(--space-md);
}

.tech-feature {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  transition: background var(--transition-base);
}

.tech-feature:hover {
  background: rgba(255,255,255,0.03);
}

.tech-feature__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.tech-feature__title {
  font-size: var(--fs-h3);
  font-weight: var(--fw-bold);
  margin-bottom: 0.25rem;
  font-size: 1.05rem;
}

.tech-feature__desc {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
  line-height: 1.6;
}

/* --- Specifications Section --- */
.specs {
  padding: var(--space-section) 0;
  position: relative;
  background: var(--color-deep-ocean);
}

.specs__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.specs__header .section-subtitle {
  margin: 0 auto;
}

.specs__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.spec-card {
  text-align: center;
  padding: var(--space-xl) var(--space-md);
}

.spec-card__icon {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--space-md);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: background var(--transition-base), transform var(--transition-base);
}

.spec-card:hover .spec-card__icon {
  background: rgba(255,255,255,0.15);
  transform: scale(1.1);
}

.spec-card__value {
  font-family: var(--font-heading);
  font-size: var(--fs-h2);
  font-weight: var(--fw-black);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25rem;
}

.spec-card__label {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: var(--fw-semibold);
  margin-bottom: 0.5rem;
}

.spec-card__detail {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* --- Specs Detail Table --- */
.specs-detail {
  margin-top: var(--space-2xl);
}

.specs-detail__table {
  width: 100%;
  border-collapse: collapse;
}

.specs-detail__table tr {
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--transition-fast);
}

.specs-detail__table tr:hover {
  background: rgba(255,255,255,0.02);
}

.specs-detail__table td {
  padding: 1rem 0.5rem;
  vertical-align: top;
}

.specs-detail__table td:first-child {
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
  white-space: nowrap;
  width: 45%;
  font-size: var(--fs-small);
}

.specs-detail__table td:last-child {
  color: var(--color-white);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-small);
}

/* --- Applications Section --- */
.applications {
  padding: var(--space-section) 0;
  position: relative;
  background: var(--gradient-ocean);
}

.applications__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.applications__header .section-subtitle {
  margin: 0 auto;
}

.applications__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  justify-content: center;
}

.app-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  min-height: 380px;
  display: flex;
  align-items: flex-end;
}

.app-card__bg {
  position: absolute;
  inset: 0;
}

.app-card__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.app-card:hover .app-card__bg img {
  transform: scale(1.08);
}

.app-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(17,17,17,0.95) 0%, rgba(17,17,17,0.3) 50%, transparent 100%);
}

.app-card__content {
  position: relative;
  z-index: 2;
  padding: var(--space-xl);
  width: 100%;
}

.app-card__tag {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-full);
  font-size: var(--fs-label);
  font-weight: var(--fw-semibold);
  color: var(--color-aqua);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.app-card__title {
  font-size: var(--fs-h3);
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-xs);
}

.app-card__desc {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
  line-height: 1.6;
}

/* --- Brushes Section --- */
.brushes {
  padding: var(--space-section) 0;
  position: relative;
  background: var(--color-deep-ocean);
}

.brushes__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
  margin-top: var(--space-2xl);
}

.brushes__image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.brushes__image img {
  width: 100%;
  height: auto;
  transition: transform var(--transition-slow);
}

.brushes__image:hover img {
  transform: scale(1.03);
}

.brush-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.brush-item:last-child {
  border-bottom: none;
}

.brush-item__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.brush-item__icon {
  font-size: 1.3rem;
}

.brush-item__title {
  font-size: 1.05rem;
  font-weight: var(--fw-bold);
}

.brush-item__desc {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
  line-height: 1.6;
  padding-left: 2.3rem;
}

/* --- Benefits Section --- */
.benefits {
  padding: var(--space-section) 0;
  position: relative;
  background: var(--gradient-ocean);
}

.benefits__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.benefits__header .section-subtitle {
  margin: 0 auto;
}

.benefits__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.audience__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
}

.benefit-card {
  text-align: center;
  padding: var(--space-xl);
}

.benefit-card__icon {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--space-md);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  transition: all var(--transition-base);
}

.benefit-card:hover .benefit-card__icon {
  background: rgba(255,255,255,0.18);
  transform: scale(1.1) rotate(5deg);
  box-shadow: var(--shadow-glow);
}

.benefit-card__title {
  font-size: 1.1rem;
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-xs);
}

.benefit-card__desc {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
  line-height: 1.6;
}

/* --- CTA Section --- */
.cta-section {
  padding: var(--space-section) 0 4rem 0;
  position: relative;
  text-align: center;
  overflow: hidden;
}

.cta-section__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.cta-section__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cta-section__overlay {
  position: absolute;
  inset: 0;
  background: 
    linear-gradient(to bottom, var(--color-deep-ocean) 0%, transparent 15%, transparent 90%, var(--color-deep-ocean) 100%),
    rgba(17,17,17,0.85);
  z-index: 1;
}

.cta-section__content {
  position: relative;
  z-index: 2;
}

.cta-section__title {
  font-size: var(--fs-h1);
  font-weight: var(--fw-black);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.cta-section__subtitle {
  font-size: var(--fs-body);
  color: var(--color-text);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  line-height: 1.6;
}

.cta-section__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}

.cta-section__contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  max-width: 700px;
  margin: 0 auto;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.contact-item:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.2);
}

.contact-item__icon {
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-item__text {
  text-align: left;
}

.contact-item__label {
  font-size: var(--fs-label);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: var(--fw-semibold);
}

.contact-item__value {
  color: var(--color-white);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-small);
}

.contact-item__value a {
  color: var(--color-white);
}

.contact-item__value a:hover {
  color: var(--color-aqua);
}

/* Social Links */
.social-links {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.social-link {
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--color-text);
  transition: all var(--transition-base);
}

.social-link:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--color-aqua);
  color: var(--color-aqua);
  transform: translateY(-3px);
}

/* --- Footer --- */
.footer {
  padding: 1rem 0;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.06);
  background: var(--color-deep-ocean);
}

.footer__text {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
}

.footer__text a {
  color: var(--color-aqua);
}

/* --- Scroll Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.reveal-left.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.reveal-scale.revealed {
  opacity: 1;
  transform: scale(1);
}

/* Staggered delays */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }
.delay-6 { transition-delay: 0.6s; }

/* --- Counter Animation --- */
.counter {
  display: inline-block;
}

/* --- Responsive: Tablet --- */
@media (min-width: 640px) {
  .specs__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .benefits__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .cta-section__contact {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- Responsive: Desktop --- */
@media (min-width: 1024px) {
  .navbar__links {
    display: flex;
  }
  
  .navbar__cta {
    display: inline-flex;
  }
  
  .navbar__toggle {
    display: none;
  }
  
  .technology__grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .specs__grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .applications__grid {
    grid-template-columns: repeat(2, minmax(300px, 450px));
  }
  
  .brushes__grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .benefits__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .specs-detail__table td:first-child {
    width: 35%;
  }
}

@media (min-width: 1200px) {
  .benefits__grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* --- Prefers Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .reveal, .reveal-left, .reveal-right, .reveal-scale {
    opacity: 1;
    transform: none;
  }
}

@keyframes spin-loop {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.spin-anim {
  animation: spin-loop 20s linear infinite;
}

@keyframes spin-loop-reverse {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}
.spin-reverse {
  animation: spin-loop-reverse 20s linear infinite;
}