/* ==========================================================================
   SOMNISTICS RESEARCH LABS - SISTER SITE STYLES
   Dark theme using Pausality brand palette
   ========================================================================== */

/* ==========================================================================
   DESIGN TOKENS
   ========================================================================== */
:root {
  /* Primary Brand Colors (from Pausality) */
  --color-deep-navy: #22253A;
  --color-soft-sage: #5FC89B;
  --color-soft-sage-light: #96F0BE;

  /* Gradient Colors */
  --color-clearwater-blue: #3A61AD;
  --color-ocean-blue: #1479B6;
  --color-gradient-sage: #5FC89B;
  --color-gradient-light: #96F0BE;

  /* Brand Gradient */
  --gradient-brand: linear-gradient(45deg, #3A61AD 0%, #1479B6 33%, #5FC89B 66%, #96F0BE 100%);
  --gradient-accent: linear-gradient(135deg, #3A61AD, #5FC89B);

  /* Dark Theme Surfaces */
  --color-bg-primary: #22253A;
  --color-bg-elevated: #2a2d44;
  --color-bg-card: rgba(95, 200, 155, 0.04);
  --color-bg-card-hover: rgba(95, 200, 155, 0.08);

  /* Text Colors */
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #C8CAD4;
  --color-text-muted: #9A9DAB;
  --color-text-accent: #5FC89B;

  /* Borders */
  --color-border-subtle: rgba(255, 255, 255, 0.06);
  --color-border-hover: rgba(95, 200, 155, 0.2);

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

  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3rem;

  /* Line Heights */
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* Letter Spacing */
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.05em;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;

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

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.35);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
}


/* ==========================================================================
   RESET & BASE
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-light);
  font-size: var(--text-base);
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

a:hover {
  color: var(--color-soft-sage-light);
}


/* ==========================================================================
   LAYOUT
   ========================================================================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}


/* ==========================================================================
   ANIMATED BACKGROUND
   ========================================================================== */
.bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background:
    radial-gradient(ellipse at 20% 80%, rgba(58, 97, 173, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(95, 200, 155, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(20, 121, 182, 0.06) 0%, transparent 60%);
  animation: bg-shift 20s ease-in-out infinite;
}

@keyframes bg-shift {
  0%, 100% {
    background:
      radial-gradient(ellipse at 20% 80%, rgba(58, 97, 173, 0.12) 0%, transparent 50%),
      radial-gradient(ellipse at 80% 20%, rgba(95, 200, 155, 0.08) 0%, transparent 50%),
      radial-gradient(ellipse at 50% 50%, rgba(20, 121, 182, 0.06) 0%, transparent 60%);
  }
  50% {
    background:
      radial-gradient(ellipse at 80% 20%, rgba(58, 97, 173, 0.15) 0%, transparent 60%),
      radial-gradient(ellipse at 20% 80%, rgba(95, 200, 155, 0.12) 0%, transparent 60%),
      radial-gradient(ellipse at 40% 40%, rgba(20, 121, 182, 0.08) 0%, transparent 50%);
  }
}

.neural-network {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0.35;
}

.waveform {
  position: absolute;
  width: 100%;
  height: 2px;
  overflow: hidden;
}

.waveform::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 200%;
  height: 100%;
  background: linear-gradient(90deg,
    transparent 0%,
    transparent 20%,
    var(--color-soft-sage) 25%,
    var(--color-soft-sage) 30%,
    transparent 35%,
    transparent 45%,
    var(--color-clearwater-blue) 50%,
    var(--color-clearwater-blue) 55%,
    transparent 60%,
    transparent 80%,
    transparent 100%
  );
  animation: heartbeat 4s infinite ease-in-out;
}

.waveform.vertical {
  width: 2px;
  height: 100%;
}

.waveform.vertical::before {
  background: linear-gradient(0deg,
    transparent 0%,
    transparent 20%,
    var(--color-soft-sage) 25%,
    var(--color-soft-sage) 30%,
    transparent 35%,
    transparent 45%,
    var(--color-clearwater-blue) 50%,
    var(--color-clearwater-blue) 55%,
    transparent 60%,
    transparent 80%,
    transparent 100%
  );
  animation: heartbeat-vertical 5s infinite ease-in-out;
}

@keyframes heartbeat {
  0%, 100% {
    left: -100%;
    opacity: 0.3;
  }
  50% {
    left: 0%;
    opacity: 1;
  }
}

@keyframes heartbeat-vertical {
  0%, 100% {
    top: -100%;
    opacity: 0.3;
  }
  50% {
    top: 0%;
    opacity: 1;
  }
}

.pulse-line {
  position: absolute;
  height: 1px;
  background: var(--color-soft-sage);
  opacity: 0;
  animation: pulse-sweep 6s infinite ease-in-out;
}

@keyframes pulse-sweep {
  0%, 90%, 100% {
    opacity: 0;
    transform: scaleX(0);
  }
  5%, 15% {
    opacity: 0.6;
    transform: scaleX(1);
  }
  10% {
    opacity: 0.8;
    transform: scaleX(1.2);
  }
}


/* ==========================================================================
   TOP BAR
   ========================================================================== */
.top-bar {
  height: 3px;
  background: var(--gradient-brand);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1001;
}


/* ==========================================================================
   HEADER
   ========================================================================== */
.header {
  padding: var(--space-4) 0;
  position: fixed;
  top: 3px;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(34, 37, 58, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-subtle);
}

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

.header__logo {
  font-family: var(--font-primary);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: color var(--transition-base);
}

.header__logo:hover {
  color: var(--color-soft-sage);
}

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

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.header__nav a {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-normal);
  text-decoration: none;
  transition: color var(--transition-base);
  letter-spacing: var(--tracking-normal);
}

.header__nav a:hover,
.header__nav a.active {
  color: var(--color-text-primary);
}

/* Mobile menu */
.header__menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  cursor: pointer;
  padding: var(--space-2);
}


/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */
.headline-hero {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: var(--font-weight-semibold);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.headline-large {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: var(--font-weight-semibold);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.headline-medium {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: var(--font-weight-medium);
  line-height: var(--leading-snug);
  color: var(--color-text-primary);
}

.body-large {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.body-base {
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
}

.label {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-accent);
}


/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
  padding: 180px 0 var(--space-20);
  text-align: center;
  position: relative;
}

.hero__label {
  margin-bottom: var(--space-4);
}

.hero__title {
  margin-bottom: var(--space-6);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero__subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--color-text-muted);
  margin-bottom: var(--space-10);
  max-width: 750px;
  margin-left: auto;
  margin-right: auto;
  line-height: var(--leading-relaxed);
}

.hero__description {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto;
  line-height: var(--leading-relaxed);
}


/* ==========================================================================
   SECTION LAYOUT
   ========================================================================== */
.section {
  padding: var(--space-16) 0;
  position: relative;
}

.section__container {
  background: var(--color-bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-2xl);
  padding: var(--space-12) var(--space-10);
  margin: 0 var(--space-4);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-4);
}

.section__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--leading-relaxed);
}


/* ==========================================================================
   FEATURE CARDS
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--space-8);
  margin-top: var(--space-16);
}

.feature-card {
  background: rgba(42, 45, 68, 0.5);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-8px);
  background: rgba(42, 45, 68, 0.7);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-xl);
}

.feature-card__icon {
  width: 56px;
  height: 56px;
  background: var(--gradient-accent);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
}

.feature-card__icon svg {
  width: 26px;
  height: 26px;
  fill: white;
}

.feature-card__title {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

.feature-card__description {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
}

.feature-card__link {
  display: inline-flex;
  align-items: center;
  color: var(--color-text-accent);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--text-sm);
  transition: all var(--transition-base);
}

.feature-card__link:hover {
  color: var(--color-soft-sage-light);
  transform: translateX(4px);
}

.feature-card__link::after {
  content: '\2192';
  margin-left: var(--space-2);
  transition: transform var(--transition-base);
}

.feature-card__link:hover::after {
  transform: translateX(3px);
}


/* ==========================================================================
   APP STORE BUTTON
   ========================================================================== */
.app-store-btn {
  display: inline-block;
  transition: all var(--transition-base);
}

.app-store-btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.app-store-btn img {
  height: 48px;
  width: auto;
}


/* ==========================================================================
   NEWSLETTER SECTION
   ========================================================================== */
.newsletter__container {
  background: rgba(58, 97, 173, 0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(58, 97, 173, 0.12);
  border-radius: var(--radius-2xl);
  padding: var(--space-12) var(--space-10);
  margin: 0 var(--space-4);
  text-align: center;
}

.newsletter__form-wrapper {
  max-width: 560px;
  margin: var(--space-10) auto 0;
}

.newsletter__form-group {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  align-items: stretch;
}

.newsletter__input {
  flex: 1;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(42, 45, 68, 0.5);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--font-weight-light);
  transition: all var(--transition-base);
  backdrop-filter: blur(6px);
}

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

.newsletter__input:focus {
  outline: none;
  border-color: var(--color-soft-sage);
  background: rgba(42, 45, 68, 0.7);
  box-shadow: 0 0 0 3px rgba(95, 200, 155, 0.1);
}

.newsletter__submit {
  padding: var(--space-4) var(--space-6);
  background: var(--gradient-accent);
  color: var(--color-text-primary);
  border: none;
  border-radius: var(--radius-lg);
  font-family: var(--font-primary);
  font-weight: var(--font-weight-medium);
  font-size: var(--text-base);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  white-space: nowrap;
}

.newsletter__submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(95, 200, 155, 0.25);
}

.newsletter__submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.newsletter__submit:disabled:hover {
  transform: none;
  box-shadow: none;
}

.newsletter__submit.success {
  background: linear-gradient(135deg, #2d7a4e, #5FC89B);
}

.newsletter__submit.error {
  background: linear-gradient(135deg, #8b2635, #a64253);
}

.newsletter__submit .subscribe-icon {
  width: 18px;
  height: 18px;
}

.newsletter__submit .loading-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: none;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.newsletter__benefits {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.newsletter__benefit {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.newsletter__benefit-icon {
  width: 16px;
  height: 16px;
  color: var(--color-soft-sage);
  flex-shrink: 0;
}

.newsletter__credit {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.newsletter__credit a {
  color: var(--color-text-accent);
  opacity: 0.6;
}

.newsletter__credit a:hover {
  opacity: 1;
}


/* ==========================================================================
   TEAM SECTION
   ========================================================================== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: var(--space-8);
  margin-top: var(--space-8);
}

.team-card {
  background: rgba(34, 37, 58, 0.6);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: all var(--transition-base);
}

.team-card:hover {
  transform: translateY(-4px);
  background: rgba(34, 37, 58, 0.8);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-lg);
}

.team-card__name {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.team-card__title {
  font-size: var(--text-sm);
  color: var(--color-text-accent);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-4);
}

.team-card__bio {
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.team-card__link {
  display: inline-flex;
  align-items: center;
  color: var(--color-text-accent);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--text-sm);
  transition: all var(--transition-base);
}

.team-card__link:hover {
  color: var(--color-soft-sage-light);
  transform: translateX(3px);
}

.team-card__link svg {
  width: 18px;
  height: 18px;
  margin-right: var(--space-2);
  fill: currentColor;
}


/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-family: var(--font-primary);
  font-weight: var(--font-weight-medium);
  font-size: var(--text-base);
  transition: all var(--transition-base);
  border: none;
  cursor: pointer;
}

.btn--primary {
  background: var(--gradient-accent);
  color: white;
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(95, 200, 155, 0.25);
  color: white;
}

.btn--secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
  color: var(--color-text-primary);
}

.btn::after {
  content: '\2192';
  margin-left: var(--space-2);
  transition: transform var(--transition-base);
}

.btn:hover::after {
  transform: translateX(3px);
}


/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  padding: var(--space-12) 0 var(--space-8);
  background: rgba(42, 45, 68, 0.3);
  border-top: 1px solid var(--color-border-subtle);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-10);
}

.footer__brand-name {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  line-height: var(--leading-normal);
}

.footer__heading {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  transition: color var(--transition-base);
}

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

.footer__social {
  display: flex;
  gap: var(--space-3);
}

.footer__social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-muted);
  transition: all var(--transition-base);
}

.footer__social-link:hover {
  background: rgba(95, 200, 155, 0.12);
  color: var(--color-soft-sage);
}

.footer__social-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.footer__bottom {
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copyright {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__legal {
  display: flex;
  gap: var(--space-6);
}

.footer__legal a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__legal a:hover {
  color: var(--color-text-primary);
}


/* ==========================================================================
   404 PAGE
   ========================================================================== */
.error-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-container {
  max-width: 560px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
  text-align: center;
}

.error-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-2xl);
  padding: var(--space-16) var(--space-10);
  position: relative;
  overflow: hidden;
}

.error-icon {
  width: 100px;
  height: 100px;
  margin: 0 auto var(--space-8);
}

.error-icon svg {
  width: 100%;
  height: 100%;
  stroke: var(--color-soft-sage);
  stroke-width: 3;
  fill: none;
  animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.8;
  }
  50% {
    transform: scale(1.05);
    opacity: 1;
  }
}

.error-code {
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  line-height: 1;
}

.error-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.error-description {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-10);
  line-height: var(--leading-relaxed);
}

.error-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}


/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 768px) {
  .header {
    padding: var(--space-3) 0;
  }

  .header__logo {
    font-size: var(--text-lg);
  }

  .header__nav {
    display: none;
  }

  .header__menu-btn {
    display: block;
  }

  .hero {
    padding: 140px 0 var(--space-12);
  }

  .section__container,
  .newsletter__container {
    margin: 0 var(--space-2);
    padding: var(--space-8) var(--space-4);
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .team-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .feature-card,
  .team-card {
    padding: var(--space-6);
  }

  .newsletter__form-group {
    flex-direction: column;
    gap: var(--space-3);
  }

  .newsletter__benefits {
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

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

  .footer__legal {
    justify-content: center;
  }

  .error-card {
    margin: 0 var(--space-2);
    padding: var(--space-10) var(--space-6);
  }

  .error-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: calc(var(--space-20) + 3px) 0 var(--space-8);
  }

  .headline-hero {
    font-size: 2rem;
  }

  .section__title {
    font-size: 1.75rem;
  }
}