/* === PuraMind AI Landing — Light/Dark Theme === */

/* === Light Theme (default) === */
:root {
  --brand-blue: #4A6FA5;
  --brand-blue-dark: #3A5A8A;
  --brand-blue-light: #6B8FBF;
  --brand-pink: #E84D8A;
  --brand-pink-dark: #D03A75;
  --brand-pink-light: #F07AAD;
  --brand-orange: #E8833A;

  --bg-page: #F8F4FF;
  --bg-surface: #FFFFFF;
  --bg-alt: #FFFFFF;
  --text-primary: #1E293B;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --border: rgba(74, 111, 165, 0.12);
  --border-light: #E2E8F0;
  --nav-bg: rgba(248, 244, 255, 0.85);
  --nav-bg-scrolled: rgba(255, 255, 255, 0.96);
  --card-bg: #FFFFFF;
  --card-bg-alt: #F8F4FF;
  --hero-bg: linear-gradient(160deg, #F0EAFF 0%, #FFF4F9 50%, #EAF0FF 100%);
  --shadow-card: 0 4px 24px rgba(74, 111, 165, 0.08);
  --shadow-hover: 0 12px 40px rgba(74, 111, 165, 0.18);
  --blob-opacity: 0.45;

  --section-gap: 5.5rem;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Dark Theme === */
[data-theme="dark"] {
  --bg-page: #0D1628;
  --bg-surface: #111D35;
  --bg-alt: #0A1220;
  --text-primary: #E8EDF7;
  --text-secondary: #8EA8C8;
  --text-muted: #506480;
  --border: rgba(255, 255, 255, 0.07);
  --border-light: rgba(255, 255, 255, 0.07);
  --nav-bg: rgba(13, 22, 40, 0.85);
  --nav-bg-scrolled: rgba(11, 18, 33, 0.97);
  --card-bg: #162036;
  --card-bg-alt: #0D1628;
  --hero-bg: linear-gradient(160deg, #0A1020 0%, #150D28 50%, #0A1428 100%);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.45);
  --blob-opacity: 0.22;
}

/* === Keyframe Animations === */

@keyframes blob-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%       { transform: translate(40px, -40px) scale(1.08); }
  66%       { transform: translate(-30px, 25px) scale(0.94); }
}

@keyframes blob-float-2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  40%       { transform: translate(-50px, 30px) scale(1.1); }
  70%       { transform: translate(30px, -20px) scale(0.92); }
}

@keyframes blob-float-3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%       { transform: translate(20px, 40px) scale(1.06); }
}

@keyframes hero-fade-in {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes badge-in {
  from { opacity: 0; transform: scale(0.85); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes logo-float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-3px); }
}

@keyframes theme-toggle-spin {
  from { transform: rotate(0deg) scale(0.7); opacity: 0; }
  to   { transform: rotate(360deg) scale(1); opacity: 1; }
}

@keyframes pulse-ring {
  0%   { box-shadow: 0 6px 20px rgba(232,77,138,0.35), 0 0 0 0 rgba(232,77,138,0.5); }
  60%  { box-shadow: 0 6px 20px rgba(232,77,138,0.35), 0 0 0 16px rgba(232,77,138,0); }
  100% { box-shadow: 0 6px 20px rgba(232,77,138,0.35), 0 0 0 0 rgba(232,77,138,0); }
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  color-scheme: light;
  transition: color-scheme 0s;
}

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

body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-page);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

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

a {
  color: var(--brand-pink);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--brand-pink-dark);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0;
  transition: background var(--transition), box-shadow var(--transition);
}

.nav.scrolled {
  background: var(--nav-bg-scrolled);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.12);
}

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

.nav-logo {
  height: 36px;
  width: auto;
  animation: logo-float 3.5s ease-in-out infinite;
  transition: transform var(--transition), filter var(--transition);
}

.nav-logo:hover {
  animation: none;
  transform: scale(1.1);
  filter: drop-shadow(0 0 10px rgba(232, 77, 138, 0.5))
          drop-shadow(0 0 20px rgba(74, 111, 165, 0.3));
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--brand-pink);
  transform: scaleX(0);
  transition: transform var(--transition);
  border-radius: 2px;
}

.nav-links a:hover {
  color: var(--brand-blue);
}

.nav-links a:hover::after {
  transform: scaleX(1);
}

.nav-lang {
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-blue-light));
  color: #fff !important;
  padding: 0.35rem 0.9rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: opacity var(--transition), transform var(--transition) !important;
}

.nav-lang::after {
  display: none !important;
}

.nav-lang:hover {
  opacity: 0.88;
  transform: translateY(-1px);
  color: #fff !important;
}

/* === Theme Toggle Button === */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--border);
  border: 1px solid var(--border-light);
  cursor: pointer;
  font-size: 1rem;
  transition: background var(--transition), transform var(--transition);
  flex-shrink: 0;
  line-height: 1;
}

.theme-toggle:hover {
  background: var(--border-light);
  transform: scale(1.08);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
  animation: theme-toggle-spin 0.35s ease-out;
}

/* Light mode: show moon (switch to dark) */
[data-theme="light"] .theme-toggle .icon-moon { display: block; }
[data-theme="dark"]  .theme-toggle .icon-sun  { display: block; }

/* Mobile toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: 0.3s;
  border-radius: 2px;
}

/* === Hero === */
.hero {
  position: relative;
  padding: calc(var(--section-gap) + 4rem) 0 calc(var(--section-gap) + 2rem);
  text-align: center;
  overflow: hidden;
  background: var(--hero-bg);
}

/* Animated blobs */
.hero-blobs {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: var(--blob-opacity);
}

.blob--1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(74, 111, 165, 0.8) 0%, transparent 70%);
  top: -120px;
  left: -100px;
  animation: blob-float 14s ease-in-out infinite;
}

.blob--2 {
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(232, 77, 138, 0.75) 0%, transparent 70%);
  top: 30px;
  right: -80px;
  animation: blob-float-2 18s ease-in-out infinite;
}

.blob--3 {
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(232, 131, 58, 0.6) 0%, transparent 70%);
  bottom: -80px;
  left: 40%;
  animation: blob-float-3 22s ease-in-out infinite;
}

/* Canvas particles */
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
}

/* Hero badge */
.hero-badge {
  display: inline-block;
  background: rgba(74, 111, 165, 0.12);
  border: 1px solid rgba(74, 111, 165, 0.28);
  color: var(--brand-blue);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.4rem 1.1rem;
  border-radius: 100px;
  margin-bottom: 1.5rem;
  animation: badge-in 0.6s ease-out both;
}

[data-theme="dark"] .hero-badge {
  background: rgba(74, 111, 165, 0.2);
  border-color: rgba(107, 143, 191, 0.4);
  color: var(--brand-blue-light);
}

[data-theme="dark"] .hero-headline {
  background: linear-gradient(135deg, #7EC8F5 0%, #F87ABF 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-headline {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--brand-blue) 0%, var(--brand-pink) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  max-width: 760px;
  margin: 0 auto 1.25rem;
  animation: hero-fade-in 0.8s ease-out 0.15s both;
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 2.5rem;
  animation: hero-fade-in 0.8s ease-out 0.3s both;
}

.btn-cta {
  display: inline-block;
  background: linear-gradient(135deg, var(--brand-pink) 0%, var(--brand-pink-dark) 100%);
  color: #fff;
  padding: 1rem 2.5rem;
  border-radius: 10px;
  font-size: 1.05rem;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 6px 20px rgba(232, 77, 138, 0.35);
  animation: hero-fade-in 0.8s ease-out 0.45s both;
}

.btn-cta:hover {
  color: #fff;
  transform: translateY(-3px) scale(1.02);
  animation: pulse-ring 1.4s ease-out infinite;
}

/* === Scroll Animations === */
.animate-up,
.service-card,
.process-step {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-up.visible,
.service-card.visible,
.process-step.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Sections === */
.section {
  padding: var(--section-gap) 0;
  background: var(--bg-page);
  transition: background var(--transition);
}

.section--alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1rem;
  text-align: center;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, var(--brand-blue), var(--brand-pink));
  border-radius: 2px;
  margin: 0.75rem auto 0;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

/* === About === */
.about-text {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.about-text p {
  margin-bottom: 1rem;
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.about-text p:last-child {
  margin-bottom: 0;
}

/* === Services === */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  margin-top: 2.5rem;
}

.service-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), opacity 0.6s ease, background var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--brand-blue), var(--brand-pink));
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  opacity: 0;
  transition: opacity var(--transition);
}

.section--alt .service-card {
  background: var(--card-bg-alt);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(232, 77, 138, 0.25);
}

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

.service-icon {
  font-size: 2.5rem;
  margin-bottom: 1.1rem;
  display: block;
  transition: transform var(--transition);
}

.service-card:hover .service-icon {
  transform: scale(1.15) rotate(-3deg);
}

.service-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.service-card ul {
  list-style: none;
  padding: 0;
}

.service-card li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.6rem;
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.service-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-pink));
}

/* === Process === */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 2.5rem;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 26px;
  left: calc(12.5% + 26px);
  right: calc(12.5% + 26px);
  height: 2px;
  background: linear-gradient(90deg, var(--brand-blue), var(--brand-pink));
  opacity: 0.25;
}

.process-step {
  text-align: center;
  position: relative;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-pink));
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.1rem;
  box-shadow: 0 4px 16px rgba(74, 111, 165, 0.35);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  z-index: 1;
}

.process-step:hover .step-number {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(232, 77, 138, 0.4);
}

.process-step h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.process-step p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* === Blog === */
@keyframes blog-gradient {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes blog-orb-1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%       { transform: translate(20px, -15px) scale(1.1); }
}
@keyframes blog-orb-2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%       { transform: translate(-25px, 20px) scale(0.9); }
}
@keyframes blog-orb-3 {
  0%, 100% { transform: translate(0, 0); }
  50%       { transform: translate(15px, 15px); }
}

@keyframes arrow-nudge {
  0%, 100% { transform: translateX(0); }
  50%       { transform: translateX(5px); }
}

.blog-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  background: linear-gradient(270deg,
    #3A5A8A, #5B3A8A, #8A3A6B, #3A5A8A);
  background-size: 300% 300%;
  animation: blog-gradient 8s ease infinite;
  color: #fff;
  padding: 2.75rem 3rem;
  border-radius: var(--radius-xl);
  max-width: 860px;
  margin: 0 auto;
  box-shadow: 0 12px 50px rgba(74, 111, 165, 0.35);
  position: relative;
  overflow: hidden;
}

/* Animated orbs inside banner */
.blog-banner-orbs {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.blog-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(30px);
}

.blog-orb--1 {
  width: 160px; height: 160px;
  background: rgba(232, 77, 138, 0.35);
  top: -40px; right: 120px;
  animation: blog-orb-1 7s ease-in-out infinite;
}

.blog-orb--2 {
  width: 120px; height: 120px;
  background: rgba(232, 131, 58, 0.25);
  bottom: -30px; right: 60px;
  animation: blog-orb-2 9s ease-in-out infinite;
}

.blog-orb--3 {
  width: 100px; height: 100px;
  background: rgba(255, 255, 255, 0.08);
  top: 20px; left: 30px;
  animation: blog-orb-3 11s ease-in-out infinite;
}

.blog-banner-body {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  position: relative;
  z-index: 1;
  flex: 1;
}

.blog-banner-icon {
  font-size: 3rem;
  flex-shrink: 0;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
  transition: transform var(--transition);
}

.blog-banner:hover .blog-banner-icon {
  transform: rotate(-8deg) scale(1.1);
}

.blog-banner-text {
  position: relative;
  z-index: 1;
}

.blog-eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.7;
  margin-bottom: 0.4rem;
}

.blog-banner-text h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.blog-banner-text p {
  font-size: 0.95rem;
  opacity: 0.8;
  line-height: 1.5;
}

.blog-banner-btn {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(10px);
  border: 1.5px solid rgba(255, 255, 255, 0.35);
  color: #fff;
  padding: 0.85rem 1.75rem;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.95rem;
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.blog-btn-arrow {
  display: inline-block;
  font-size: 1.1rem;
  transition: transform var(--transition);
}

.blog-banner-btn:hover {
  background: rgba(255, 255, 255, 0.28);
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
  transform: translateY(-2px);
}

.blog-banner-btn:hover .blog-btn-arrow {
  animation: arrow-nudge 0.6s ease infinite;
}

/* === Contacts === */
.contacts-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.channels {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2rem;
}

.channel {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--card-bg-alt);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 1.1rem 1.5rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition), background var(--transition);
  cursor: pointer;
}

.section--alt .channel {
  background: var(--card-bg);
}

.channel:hover {
  border-color: var(--brand-pink);
  transform: translateX(4px);
  box-shadow: var(--shadow-card);
}

.channel-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.channel-info {
  text-align: left;
}

.channel-label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.channel-display {
  font-size: 0.9rem;
  color: var(--brand-pink);
}

.channel--disabled {
  opacity: 0.5;
  pointer-events: none;
}

.channel--disabled .channel-display {
  color: var(--text-muted);
  font-style: italic;
}

/* === Footer === */
.footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: 0.85rem;
  background: var(--bg-surface);
  transition: background var(--transition);
}

/* === Responsive === */
@media (max-width: 768px) {
  :root { --section-gap: 4rem; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--nav-bg-scrolled);
    backdrop-filter: blur(12px);
    padding: 1rem 1.5rem;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border-light);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  }

  .nav-links.active { display: flex; }
  .nav-toggle { display: block; }

  .hero-headline { font-size: 2.1rem; }
  .hero-sub { font-size: 1.05rem; }

  .services-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .process-steps {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

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

  .blog-banner {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
    padding: 2rem 1.5rem;
  }

  .blog-banner-body {
    flex-direction: column;
    text-align: center;
  }

  .blog-banner-icon {
    font-size: 2.5rem;
  }
}

@media (max-width: 480px) {
  .hero-headline { font-size: 1.75rem; }
  .hero-badge { font-size: 0.7rem; }
  .process-steps { grid-template-columns: 1fr; }
  .section-title { font-size: 1.7rem; }
  .blob { opacity: calc(var(--blob-opacity) * 0.6); }
}