/* ================================================
   TheShishaBriefing — Main Stylesheet
   Design: Clean Modern Confidence (Dark Intelligence)
   ================================================ */

/* ------------------------------------------------
   CSS Custom Properties
   ------------------------------------------------ */
:root {
  /* Colors */
  --color-bg-base: #0B1220;
  --color-bg-mid: #111827;
  --color-bg-card: rgba(255, 255, 255, 0.04);
  --color-bg-card-hover: rgba(255, 255, 255, 0.07);
  --color-bg-card-featured: rgba(76, 203, 222, 0.06);

  --color-cyan: #5ED7F0;
  --color-cyan-bright: #7DE8FF;
  --color-cyan-dim: rgba(94, 215, 240, 0.15);
  --color-cyan-border: rgba(76, 203, 222, 0.35);
  --color-cyan-border-hover: rgba(94, 215, 240, 0.65);
  --color-purple: #8A6BD6;
  --color-purple-dim: rgba(138, 107, 214, 0.12);

  --color-text-primary: #F7FAFC;
  --color-text-secondary: #B8C0CC;
  --color-text-muted: #7E8898;
  --color-text-cyan: #5ED7F0;

  --color-red: #FF5A5A;
  --color-amber: #F59E0B;
  --color-green: #34D399;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Layout */
  --container-max: 1200px;
  --nav-height: 72px;

  /* Borders */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows / Glows */
  --glow-cyan: 0 0 20px rgba(94, 215, 240, 0.2), 0 0 60px rgba(94, 215, 240, 0.07);
  --glow-cyan-strong: 0 0 30px rgba(94, 215, 240, 0.35), 0 0 80px rgba(94, 215, 240, 0.12);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4), 0 1px 4px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.5), 0 2px 8px rgba(0, 0, 0, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-base);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

img, video, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul {
  list-style: none;
}

input, textarea, select, button {
  font-family: inherit;
}

/* ------------------------------------------------
   Background Effects
   ------------------------------------------------ */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}

.bg-glow--teal {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(94, 215, 240, 0.12) 0%, transparent 70%);
  bottom: -100px;
  left: -150px;
  animation: glow-pulse 8s ease-in-out infinite alternate;
}

.bg-glow--purple {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(138, 107, 214, 0.1) 0%, transparent 70%);
  top: 0;
  right: -100px;
  animation: glow-pulse 10s ease-in-out infinite alternate-reverse;
}

@keyframes glow-pulse {
  0% { opacity: 0.6; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.15); }
}

/* ------------------------------------------------
   Container & Layout
   ------------------------------------------------ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  position: relative;
  z-index: 1;
}

.hide-mobile {
  display: inline;
}

/* ------------------------------------------------
   Typography Utilities
   ------------------------------------------------ */
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-cyan);
  margin-bottom: var(--space-md);
  position: relative;
  padding-left: 1.2rem;
}

.section-label::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 0.65rem;
  height: 0.65rem;
  background: var(--color-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-cyan);
}

.section-heading {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.section-heading--center {
  text-align: center;
  margin: 0 auto;
}

.section-subtext {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  text-align: center;
  max-width: 580px;
  margin: var(--space-lg) auto 0;
}

/* ------------------------------------------------
   Buttons
   ------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  text-decoration: none;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition-fast);
  border-radius: inherit;
}

.btn:hover::after {
  background: rgba(255,255,255,0.07);
}

.btn:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 3px;
}

/* Primary button */
.btn--primary {
  background: var(--color-cyan);
  color: var(--color-bg-base);
  box-shadow: 0 0 20px rgba(94, 215, 240, 0.25);
}

.btn--primary:hover {
  background: var(--color-cyan-bright);
  box-shadow: var(--glow-cyan-strong);
  transform: translateY(-1px);
}

.btn--primary:active {
  transform: translateY(0);
}

/* Ghost / outline button */
.btn--ghost {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid rgba(255,255,255,0.18);
}

.btn--ghost:hover {
  border-color: var(--color-cyan-border-hover);
  color: var(--color-cyan);
  box-shadow: 0 0 0 1px rgba(94, 215, 240, 0.2);
}

/* Sizes */
.btn--sm {
  padding: 0.5rem 1.125rem;
  font-size: 0.875rem;
}

.btn--lg {
  padding: 0.875rem 1.875rem;
  font-size: 1rem;
}

.btn--full {
  width: 100%;
  padding: 0.875rem 1.5rem;
}

/* ------------------------------------------------
   Navigation
   ------------------------------------------------ */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  transition: background var(--transition-slow), box-shadow var(--transition-slow), backdrop-filter var(--transition-slow);
}

.nav-header.scrolled {
  background: rgba(11, 18, 32, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(76, 203, 222, 0.12), 0 4px 32px rgba(0,0,0,0.4);
}

.nav-container {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

/* Brand */
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  flex-shrink: 0;
  text-decoration: none;
}

.nav-brand__name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
  transition: color var(--transition-fast);
}

.nav-brand:hover .nav-brand__name {
  color: var(--color-cyan);
}

.nav-brand__divider {
  width: 1px;
  height: 1.25rem;
  background: rgba(255,255,255,0.15);
  flex-shrink: 0;
}

.nav-brand__tagline {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-text-muted);
  letter-spacing: 0.01em;
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  margin-left: auto;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding-bottom: 2px;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-cyan);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--color-text-primary);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta {
  margin-left: var(--space-md);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}

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

/* Mobile menu */
.mobile-menu {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: rgba(11, 18, 32, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(76, 203, 222, 0.12);
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--transition-slow);
}

.mobile-menu.open {
  max-height: 400px;
}

.mobile-nav {
  padding: var(--space-lg) var(--space-xl) var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.mobile-nav__link {
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: color var(--transition-fast);
}

.mobile-nav__link:hover {
  color: var(--color-cyan);
}

.mobile-nav__cta {
  margin-top: var(--space-md);
  text-align: center;
}

/* ------------------------------------------------
   Hero Section
   ------------------------------------------------ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
  overflow: hidden;
}

.hero__grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(94, 215, 240, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(94, 215, 240, 0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 0%, transparent 100%);
  pointer-events: none;
}

.hero__container {
  padding-top: var(--space-5xl);
  padding-bottom: var(--space-5xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-xl);
}

/* Hero badge */
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(94, 215, 240, 0.08);
  border: 1px solid var(--color-cyan-border);
  border-radius: var(--radius-full);
  padding: 0.375rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-cyan);
  letter-spacing: 0.01em;
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-cyan);
  border-radius: 50%;
  animation: badge-pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes badge-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(94, 215, 240, 0.5); }
  50% { box-shadow: 0 0 0 5px rgba(94, 215, 240, 0); }
}

/* Hero heading */
.hero__heading {
  font-size: clamp(2.75rem, 7vw, 5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  max-width: 800px;
}

/* Hero subtext */
.hero__subtext {
  font-size: clamp(1rem, 1.5vw, 1.1875rem);
  color: var(--color-text-secondary);
  max-width: 580px;
  line-height: 1.75;
}

/* Hero actions */
.hero__actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
}

/* Hero signal cards */
.hero__signal-cards {
  display: flex;
  gap: var(--space-lg);
  width: 100%;
  max-width: 760px;
  margin-top: var(--space-xl);
  flex-wrap: wrap;
  justify-content: center;
}

.signal-card {
  flex: 1;
  min-width: 260px;
  max-width: 340px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-cyan-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  text-align: left;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  animation: card-float 6s ease-in-out infinite;
}

.signal-card--left {
  animation-delay: 0s;
}

.signal-card--right {
  animation-delay: 3s;
}

@keyframes card-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.signal-card__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.625rem;
}

.signal-card__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.signal-card__dot--red {
  background: var(--color-red);
  box-shadow: 0 0 8px var(--color-red);
  animation: badge-pulse 1.5s ease-in-out infinite;
}

.signal-card__dot--cyan {
  background: var(--color-cyan);
  box-shadow: 0 0 8px var(--color-cyan);
}

.signal-card__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.signal-card__time {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  margin-left: auto;
}

.signal-card__text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.signal-card__severity {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.signal-card__severity--high {
  background: rgba(255, 90, 90, 0.12);
  color: var(--color-red);
  border: 1px solid rgba(255, 90, 90, 0.25);
}

.signal-card__severity--medium {
  background: rgba(94, 215, 240, 0.1);
  color: var(--color-cyan);
  border: 1px solid var(--color-cyan-border);
}

/* ------------------------------------------------
   Concept Section
   ------------------------------------------------ */
.concept {
  padding: var(--space-5xl) 0;
}

.concept__container {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xl);
}

.concept__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.concept__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.concept__content .section-heading {
  text-align: left;
}

.concept__body {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.concept__pillars {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-top: var(--space-md);
}

.pillar {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.pillar__icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-cyan-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-cyan);
}

.pillar div {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.pillar strong {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.pillar span {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Briefing preview */
.concept__visual {
  position: relative;
}

.briefing-preview {
  background: rgba(11, 18, 32, 0.8);
  border: 1px solid var(--color-cyan-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--glow-cyan), var(--shadow-card);
  backdrop-filter: blur(16px);
}

.briefing-preview__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem var(--space-lg);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  background: rgba(255,255,255,0.03);
}

.briefing-preview__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.briefing-preview__dot--red { background: #FF5F57; }
.briefing-preview__dot--amber { background: #FFBD2E; }
.briefing-preview__dot--green { background: #28C840; }

.briefing-preview__title {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-left: 0.5rem;
  font-weight: 500;
}

.briefing-preview__body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.briefing-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}

.briefing-item--high {
  background: rgba(255, 90, 90, 0.06);
  border-color: rgba(255, 90, 90, 0.15);
}

.briefing-item--medium {
  background: rgba(94, 215, 240, 0.05);
  border-color: rgba(94, 215, 240, 0.12);
}

.briefing-item--low {
  background: rgba(255,255,255,0.03);
  border-color: rgba(255,255,255,0.06);
}

.briefing-item__tag {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 1px;
}

.briefing-item--high .briefing-item__tag {
  background: rgba(255,90,90,0.2);
  color: var(--color-red);
}

.briefing-item--medium .briefing-item__tag {
  background: rgba(94,215,240,0.15);
  color: var(--color-cyan);
}

.briefing-item--low .briefing-item__tag {
  background: rgba(255,255,255,0.08);
  color: var(--color-text-muted);
}

.briefing-preview__footer {
  padding: 0.75rem var(--space-lg);
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  background: rgba(255,255,255,0.02);
}

/* ------------------------------------------------
   Use Cases Section
   ------------------------------------------------ */
.use-cases {
  padding: var(--space-5xl) 0;
}

.use-cases > .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.use-cases__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  width: 100%;
  margin-top: var(--space-3xl);
}

.use-case-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
  transition: all var(--transition-base);
  cursor: default;
  position: relative;
  overflow: hidden;
}

.use-case-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(94, 215, 240, 0.03) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-base);
  border-radius: inherit;
}

.use-case-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-cyan-border);
  box-shadow: var(--shadow-card-hover), 0 0 0 1px rgba(94, 215, 240, 0.1);
  transform: translateY(-3px);
}

.use-case-card:hover::before {
  opacity: 1;
}

.use-case-card__icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: var(--color-cyan-dim);
  border: 1px solid var(--color-cyan-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-cyan);
  margin-top: 2px;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.use-case-card:hover .use-case-card__icon {
  background: rgba(94, 215, 240, 0.15);
  box-shadow: var(--glow-cyan);
}

.use-case-card__content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.use-case-card__industry {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.use-case-card__signal {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-cyan);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.use-case-card__tagline {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-primary);
  opacity: 0.8;
  line-height: 1.4;
}

.use-case-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-top: 0.25rem;
}

.use-case-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.tag {
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* ------------------------------------------------
   Detailed Use Case Section
   ------------------------------------------------ */
.use-case-detail {
  padding: var(--space-5xl) 0;
}

.use-case-detail > .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.use-case-detail__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  width: 100%;
  margin-top: var(--space-3xl);
  align-items: start;
}

.use-case-detail__scenario {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.use-case-detail__sub {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.trigger-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.trigger-list li {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.trigger-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-cyan);
  border-radius: 50%;
  flex-shrink: 0;
}

.recipients {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.recipient {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  background: var(--color-cyan-dim);
  border: 1px solid var(--color-cyan-border);
  border-radius: var(--radius-full);
  color: var(--color-cyan);
}

/* Detail card */
.detail-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-cyan-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--glow-cyan), var(--shadow-card);
}

.detail-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.detail-card__status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.status-dot--red {
  background: var(--color-red);
  box-shadow: 0 0 8px var(--color-red);
  animation: badge-pulse 1.5s ease-in-out infinite;
}

.status-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-red);
}

.detail-card__time {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.detail-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

.detail-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.metric {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-sm);
  padding: 0.875rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  align-items: center;
  text-align: center;
}

.metric__value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text-primary);
}

.metric__value--red { color: var(--color-red); }
.metric__value--amber { color: var(--color-amber); }

.metric__label {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

.detail-samples {
  margin-bottom: var(--space-md);
}

.detail-samples__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 0.625rem;
}

.sample {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  font-style: italic;
  padding: 0.625rem 0.875rem;
  border-left: 2px solid var(--color-red);
  background: rgba(255,90,90,0.04);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

.detail-card__footer {
  display: flex;
  gap: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.06);
}

.detail-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-cyan);
  transition: opacity var(--transition-fast);
  text-decoration: none;
}

.detail-link:hover {
  opacity: 0.75;
  text-decoration: underline;
}

/* ------------------------------------------------
   How It Works Section
   ------------------------------------------------ */
.how-it-works {
  padding: var(--space-5xl) 0;
}

.how-it-works > .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  width: 100%;
  margin-top: var(--space-3xl);
  position: relative;
}

/* Connecting line between steps */
.steps::before {
  content: '';
  position: absolute;
  top: 2.5rem;
  left: calc(16.67% + 1rem);
  right: calc(16.67% + 1rem);
  height: 1px;
  background: linear-gradient(90deg, var(--color-cyan-border), transparent 45%, transparent 55%, var(--color-cyan-border));
  z-index: 0;
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  position: relative;
  z-index: 1;
}

.step__number {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-cyan);
  background: rgba(94, 215, 240, 0.08);
  border: 1px solid var(--color-cyan-border);
  border-radius: var(--radius-full);
  padding: 0.3rem 0.75rem;
  align-self: center;
}

.step__connector {
  display: none;
}

.step__card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
  text-align: center;
  width: 100%;
  transition: all var(--transition-base);
  cursor: default;
}

.step__card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-cyan-border);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
}

.step__icon {
  width: 56px;
  height: 56px;
  background: var(--color-cyan-dim);
  border: 1px solid var(--color-cyan-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-cyan);
  transition: box-shadow var(--transition-base);
}

.step__card:hover .step__icon {
  box-shadow: var(--glow-cyan);
}

.step__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.step__desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ------------------------------------------------
   Testimonials Section
   ------------------------------------------------ */
.testimonials {
  padding: var(--space-5xl) 0;
}

.testimonials > .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  width: 100%;
  margin-top: var(--space-3xl);
}

.testimonial-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.testimonial-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-cyan), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.testimonial-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-cyan-border);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
}

.testimonial-card:hover::before {
  opacity: 1;
}

.testimonial-card__quote-icon {
  font-size: 4rem;
  line-height: 1;
  color: var(--color-cyan);
  opacity: 0.25;
  font-family: Georgia, serif;
  margin-bottom: -1rem;
}

.testimonial-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  flex: 1;
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.06);
}

.testimonial-card__avatar {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-cyan-dim), rgba(138, 107, 214, 0.15));
  border: 1px solid var(--color-cyan-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-cyan);
  letter-spacing: 0.02em;
}

.testimonial-card__name {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-primary);
  font-style: normal;
}

.testimonial-card__title {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ------------------------------------------------
   Pricing Section
   ------------------------------------------------ */
.pricing {
  padding: var(--space-5xl) 0;
}

.pricing > .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.pricing__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  width: 100%;
  max-width: 820px;
  margin-top: var(--space-3xl);
}

.pricing-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.pricing-card--featured {
  background: var(--color-bg-card-featured);
  border-color: var(--color-cyan-border);
  box-shadow: var(--glow-cyan), var(--shadow-card);
}

.pricing-card--featured:hover {
  box-shadow: var(--glow-cyan-strong), var(--shadow-card-hover);
}

.pricing-card__glow {
  position: absolute;
  top: -80px;
  right: -80px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(94, 215, 240, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.pricing-card__header {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.pricing-card__badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--color-text-muted);
  width: fit-content;
}

.pricing-card__badge--cyan {
  background: rgba(94, 215, 240, 0.1);
  border-color: var(--color-cyan-border);
  color: var(--color-cyan);
}

.pricing-card__name {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.pricing-card__sub {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

.pricing-card__features {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
}

.pricing-card__features li {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.check-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--color-cyan);
  margin-top: 2px;
}

.pricing-card__price {
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.07);
  display: flex;
  align-items: baseline;
  gap: 0.375rem;
}

.pricing-card__amount {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.pricing-card__period {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.pricing__footnote {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-align: center;
  line-height: 1.7;
  margin-top: var(--space-xl);
}

.pricing__footnote-link {
  color: var(--color-cyan);
  transition: opacity var(--transition-fast);
}

.pricing__footnote-link:hover {
  opacity: 0.8;
}

/* ------------------------------------------------
   Contact / Lead Capture
   ------------------------------------------------ */
.contact {
  padding: var(--space-5xl) 0;
  position: relative;
}

.contact::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 80px;
  background: linear-gradient(180deg, transparent, var(--color-cyan-border));
}

.contact__container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact-form {
  width: 100%;
  max-width: 680px;
  margin-top: var(--space-3xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group--full {
  grid-column: 1 / -1;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.form-label span {
  color: var(--color-cyan);
}

.form-input {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  color: var(--color-text-primary);
  font-size: 0.9375rem;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  width: 100%;
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-cyan-border-hover);
  box-shadow: 0 0 0 3px rgba(94, 215, 240, 0.08);
}

.form-input.is-error {
  border-color: rgba(255, 90, 90, 0.6);
  box-shadow: 0 0 0 3px rgba(255, 90, 90, 0.08);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* Select wrapper */
.form-select-wrapper {
  position: relative;
}

.form-select {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  color: var(--color-text-primary);
  font-size: 0.9375rem;
  width: 100%;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-select option {
  background: var(--color-bg-mid);
  color: var(--color-text-primary);
}

.form-select:focus {
  outline: none;
  border-color: var(--color-cyan-border-hover);
  box-shadow: 0 0 0 3px rgba(94, 215, 240, 0.08);
}

.form-select.is-error {
  border-color: rgba(255, 90, 90, 0.6);
}

.select-arrow {
  position: absolute;
  right: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--color-text-muted);
  pointer-events: none;
}

.form-error {
  font-size: 0.8125rem;
  color: var(--color-red);
  min-height: 1.25rem;
  display: block;
}

.form-actions {
  display: flex;
  justify-content: center;
  margin-top: var(--space-sm);
}

/* Submit button loading state */
.submit-btn__loading {
  display: none;
  align-items: center;
  gap: 0.5rem;
}

.submit-btn__loading .spinner {
  width: 18px;
  height: 18px;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  100% { transform: rotate(360deg); }
}

#submit-btn.loading .submit-btn__text {
  display: none;
}

#submit-btn.loading .submit-btn__loading {
  display: flex;
}

/* Success message */
.form-success {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.3);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  color: var(--color-green);
}

.form-success svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  stroke: var(--color-green);
}

.form-success strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
}

.form-success p {
  font-size: 0.875rem;
  color: rgba(52, 211, 153, 0.7);
  margin-top: 0.25rem;
}

/* ------------------------------------------------
   Footer
   ------------------------------------------------ */
.footer {
  padding: var(--space-3xl) 0;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.footer__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer__name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.footer__tagline {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.footer__link {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-cyan);
}

.footer__copy {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ------------------------------------------------
   Scroll Animations
   ------------------------------------------------ */
.animate-fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.animate-fade-up.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays for sibling groups */
.use-case-card:nth-child(2).animate-fade-up { transition-delay: 0.1s; }
.use-case-card:nth-child(3).animate-fade-up { transition-delay: 0.2s; }
.use-case-card:nth-child(4).animate-fade-up { transition-delay: 0.3s; }

.step:nth-child(2).animate-fade-up { transition-delay: 0.12s; }
.step:nth-child(3).animate-fade-up { transition-delay: 0.24s; }

.testimonial-card:nth-child(2).animate-fade-up { transition-delay: 0.1s; }
.testimonial-card:nth-child(3).animate-fade-up { transition-delay: 0.2s; }

/* ------------------------------------------------
   Responsive — Tablet (max 1024px)
   ------------------------------------------------ */
@media (max-width: 1024px) {
  .concept__layout {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .concept__content .section-heading {
    text-align: center;
  }

  .concept__pillars {
    max-width: 600px;
    margin: var(--space-md) auto 0;
  }

  .use-case-detail__layout {
    grid-template-columns: 1fr;
  }

  .steps::before {
    display: none;
  }
}

/* ------------------------------------------------
   Responsive — Small Tablet (max 768px)
   ------------------------------------------------ */
@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .nav-links,
  .nav-cta {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-brand__tagline {
    display: none;
  }

  .nav-brand__divider {
    display: none;
  }

  .hero__container {
    padding-top: var(--space-4xl);
    padding-bottom: var(--space-4xl);
  }

  .hero__signal-cards {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }

  .signal-card {
    min-width: unset;
    max-width: 100%;
    width: 100%;
    animation: none;
  }

  .steps {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }

  .use-cases__grid {
    grid-template-columns: 1fr;
  }

  .testimonials__grid {
    grid-template-columns: 1fr;
  }

  .pricing__grid {
    grid-template-columns: 1fr;
    max-width: 480px;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .hide-mobile {
    display: none;
  }
}

/* ------------------------------------------------
   Responsive — Mobile (max 640px)
   ------------------------------------------------ */
@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .hero__heading {
    font-size: 2.5rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  .hero__actions .btn {
    width: 100%;
    max-width: 320px;
    justify-content: center;
  }

  .concept,
  .use-cases,
  .use-case-detail,
  .how-it-works,
  .testimonials,
  .pricing,
  .contact {
    padding: var(--space-4xl) 0;
  }

  .section-heading {
    font-size: 1.75rem;
  }

  .detail-metrics {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer__container {
    flex-direction: column;
    text-align: center;
  }

  .footer__links {
    justify-content: center;
  }

  .use-case-card {
    flex-direction: column;
  }
}

/* ------------------------------------------------
   Nav Active Link State
   ------------------------------------------------ */
.nav-link.active {
  color: var(--color-text-primary);
}

.nav-link.active::after {
  width: 100%;
}

/* ------------------------------------------------
   Keyboard Focus Styles
   ------------------------------------------------ */
body.using-keyboard *:focus {
  outline: 2px solid var(--color-cyan);
  outline-offset: 3px;
  border-radius: 3px;
}

body:not(.using-keyboard) *:focus {
  outline: none;
}

/* ------------------------------------------------
   Selection color
   ------------------------------------------------ */
::selection {
  background: rgba(94, 215, 240, 0.2);
  color: var(--color-text-primary);
}

/* ------------------------------------------------
   Scrollbar styling
   ------------------------------------------------ */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-base);
}

::-webkit-scrollbar-thumb {
  background: rgba(94, 215, 240, 0.2);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(94, 215, 240, 0.4);
}

/* ------------------------------------------------
   Section separators (subtle gradient lines)
   ------------------------------------------------ */
.concept,
.use-case-detail,
.testimonials,
.pricing,
.contact {
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

/* ------------------------------------------------
   Pricing card mouse-tracking glow
   ------------------------------------------------ */
.pricing-card--featured {
  background: radial-gradient(
    circle at var(--mouse-x, 80%) var(--mouse-y, 20%),
    rgba(94, 215, 240, 0.09) 0%,
    rgba(94, 215, 240, 0.04) 40%,
    transparent 70%
  );
  border-color: var(--color-cyan-border);
}

/* ------------------------------------------------
   Reduced Motion Accessibility
   ------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .animate-fade-up {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}