/**
 * inst4youBot Landing Page Styles
 * Mobile-first, optimized for performance
 */

/* ==========================================
   CSS Variables (Brandkit Colors)
   ========================================== */
:root {
  /* Colors from brandkit */
  --color-primary: #111111;
  --color-secondary: #060606;
  --color-accent: #2A2A2A;
  --color-text: #111111;
  --color-text-light: #666666;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8F8F8;
  --color-border: #E0E0E0;

  /* Telegram blue for CTA */
  --color-telegram: #0088CC;
  --color-telegram-hover: #006699;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;

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

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Layout */
  --container-max: 1200px;
  --container-padding: 1rem;
}

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

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

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

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

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

.section {
  padding: var(--spacing-xl) 0;
}

@media (min-width: 768px) {
  .section {
    padding: var(--spacing-2xl) 0;
  }
}

.section__header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section__header h2 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.section__header p {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
}

/* ==========================================
   Header
   ========================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
  transition: all var(--transition-base);
}

.header__container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
  font-size: var(--font-size-lg);
}

.header__logo img {
  height: 24px;
  width: auto;
}

@media (min-width: 768px) {
  .header__logo img {
    height: 32px;
  }
}

.header__burger {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--spacing-xs);
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.header__burger span {
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: all var(--transition-base);
  border-radius: 2px;
}

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

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

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

@media (min-width: 768px) {
  .header__burger {
    display: none;
  }
}

.header__nav {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: white;
  border-bottom: 1px solid var(--color-border);
  flex-direction: column;
  padding: var(--spacing-md) var(--container-padding);
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-lg);
  z-index: 999;
}

.header__nav.active {
  display: flex;
}

.header__nav a {
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.header__nav a:hover {
  background: var(--color-bg-alt);
}

@media (min-width: 768px) {
  .header__nav {
    position: static;
    display: flex;
    flex-direction: row;
    padding: 0;
    border: none;
    box-shadow: none;
    gap: var(--spacing-md);
  }

  .header__nav a {
    padding: 0;
  }

  .header__nav a:hover {
    background: none;
    color: var(--color-telegram);
  }
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.header__lang {
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.header__lang:hover {
  background: var(--color-bg-alt);
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  text-align: center;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-telegram);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn--primary:hover {
  background: var(--color-telegram-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn--secondary {
  background: white;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--secondary:hover {
  background: var(--color-primary);
  color: white;
}

.btn--lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
  padding: var(--spacing-2xl) 0;
  background: linear-gradient(135deg, #f8f8f8 0%, #ffffff 100%);
}

.hero__container {
  display: grid;
  gap: var(--spacing-xl);
  align-items: center;
}

@media (min-width: 768px) {
  .hero__container {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
  }
}

.hero__content {
  text-align: center;
}

@media (min-width: 768px) {
  .hero__content {
    text-align: left;
  }
}

.hero__content h1 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .hero__content h1 {
    font-size: var(--font-size-4xl);
  }
}

.hero__content p {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  align-items: center;
}

@media (min-width: 640px) {
  .hero__cta {
    flex-direction: row;
  }
}

@media (min-width: 768px) {
  .hero__cta {
    align-items: flex-start;
  }
}

.hero__visual {
  position: relative;
}

.hero__screenshot {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 300px;
  margin: 0 auto;
  animation: float 6s ease-in-out infinite;
}

@media (min-width: 768px) {
  .hero__screenshot {
    max-width: 400px;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* ==========================================
   Features Section
   ========================================== */
.features {
  background: var(--color-bg);
}

.features__header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.features__header h2 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.features__header p {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

.features__grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

@media (min-width: 768px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
  }
}

@media (min-width: 1024px) {
  .features__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  opacity: 0;
  transform: translateY(20px);
  text-align: center;
}

.feature.animate-in {
  animation: fadeInUp 0.6s ease forwards;
}

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

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

.feature__icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
}

.feature__title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.feature__description {
  color: var(--color-text-light);
  line-height: 1.6;
}

.feature__screenshot {
  margin-top: var(--spacing-md);
  margin-left: auto;
  margin-right: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

/* ==========================================
   Pricing Section
   ========================================== */
.pricing {
  background: var(--color-bg-alt);
}

.pricing__header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.pricing__header h2 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.pricing__grid {
  display: grid;
  gap: var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .pricing__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .pricing__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .pricing__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pricing__card {
  background: white;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-border);
  text-align: center;
  transition: all var(--transition-base);
  opacity: 1;
  transform: translateY(0);
}

.pricing__card:hover {
  border-color: var(--color-telegram);
  box-shadow: var(--shadow-lg);
  transform: scale(1.02);
}

.pricing__card--featured {
  border-color: var(--color-telegram);
  box-shadow: var(--shadow-lg);
  position: relative;
}

.pricing__badge {
  position: absolute;
  top: -12px;
  right: var(--spacing-md);
  background: var(--color-telegram);
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
}

.pricing__name {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.pricing__price {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  margin-bottom: var(--spacing-xs);
  color: var(--color-telegram);
}

.pricing__price-usd {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.pricing__features {
  list-style: none;
  margin-bottom: var(--spacing-lg);
  text-align: left;
  display: inline-block;
  margin-left: auto;
  margin-right: auto;
}

.pricing__features li {
  padding: var(--spacing-xs) 0;
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-lg) 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .footer {
    padding: var(--spacing-xl) 0 var(--spacing-md);
  }
}

.footer__container {
  display: grid;
  gap: var(--spacing-md);
  text-align: center;
}

@media (min-width: 768px) {
  .footer__container {
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-lg);
    text-align: left;
  }
}

.footer__brand {
  margin-bottom: 0;
}

@media (min-width: 768px) {
  .footer__brand {
    margin-bottom: var(--spacing-md);
  }
}

.footer__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

@media (min-width: 768px) {
  .footer__logo {
    justify-content: flex-start;
  }
}

.footer__logo img {
  height: auto;
  max-width: 100px;
  filter: brightness(0) invert(1);
}

@media (min-width: 768px) {
  .footer__logo img {
    max-width: 150px;
  }
}

.footer__description {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-sm);
}

.footer__links {
  text-align: center;
}

@media (min-width: 768px) {
  .footer__links {
    text-align: left;
  }
}

.footer__links h4 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.footer__links ul {
  display: inline-block;
  text-align: left;
  list-style: none;
}

@media (min-width: 768px) {
  .footer__links ul {
    display: block;
  }
}

@media (min-width: 768px) {
  .footer__links h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
  }
}

.footer__links li {
  margin-bottom: var(--spacing-xs);
}

.footer__links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
  word-spacing: 0.3em;
}

@media (min-width: 768px) {
  .footer__links a {
    word-spacing: normal;
  }
}

.footer__links a:hover {
  color: white;
}

.footer__bottom {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: var(--font-size-xs);
}

@media (min-width: 768px) {
  .footer__bottom {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
  }
}

/* ==========================================
   Utilities
   ========================================== */
.text-center {
  text-align: center;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.hidden {
  display: none;
}

@media (max-width: 767px) {
  .hidden-mobile {
    display: none;
  }
}

@media (min-width: 768px) {
  .hidden-desktop {
    display: none;
  }
}

/* ==========================================
   FAQ & Benefits Cards - Mobile Centered Headings Only
   ========================================== */
.faq-card h3,
.benefit-card h3 {
  text-align: center;
}

@media (min-width: 768px) {
  .faq-card h3,
  .benefit-card h3 {
    text-align: left;
  }
}