/* ========================================
   Kupid.ai — Global Stylesheet
   ======================================== */

/* CSS Variables */
:root {
  --color-primary: #120911;
  --color-secondary: #170e14;
  --color-accent: #ba9897;
  --color-accent2: #779094;
  --color-accent3: #3e6f97;
  --color-white: #ffffff;
  --color-light: #f8f5f7;
  --color-dark-text: #1a1118;
  --color-muted: #8a7e87;
  --color-border: rgba(186, 152, 151, 0.2);
  --color-card-bg: rgba(255, 255, 255, 0.03);
  --color-glass: rgba(18, 9, 17, 0.85);
  --gradient-primary: linear-gradient(135deg, #3e6f97, #779094, #ba9897);
  --gradient-dark: linear-gradient(135deg, #120911, #170e14, #1e1520);
  --gradient-cta: linear-gradient(135deg, #3e6f97, #5a8aad);
  --shadow-sm: 0 2px 8px rgba(18, 9, 17, 0.08);
  --shadow-md: 0 4px 20px rgba(18, 9, 17, 0.12);
  --shadow-lg: 0 8px 40px rgba(18, 9, 17, 0.18);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  background-color: var(--color-primary);
  color: var(--color-white);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul {
  list-style: none;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  margin-bottom: 16px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header p {
  color: var(--color-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-cta);
  color: var(--color-white);
  box-shadow: 0 4px 15px rgba(62, 111, 151, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(62, 111, 151, 0.5);
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}

.btn-secondary:hover {
  background: rgba(186, 152, 151, 0.1);
  transform: translateY(-2px);
}

.btn-large {
  padding: 18px 44px;
  font-size: 1.15rem;
  border-radius: var(--radius-xl);
}

/* ========================================
   Header / Navigation
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}

.header.scrolled {
  background: var(--color-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 10px 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-menu a {
  font-size: 0.95rem;
  color: var(--color-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: var(--transition);
}

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

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

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Language Switcher */
.lang-switcher {
  position: relative;
}

.lang-switcher-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.lang-switcher-btn:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  min-width: 160px;
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
  z-index: 1001;
}

.lang-dropdown.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-dropdown a {
  display: block;
  padding: 10px 20px;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.lang-dropdown a:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-white);
}

.lang-dropdown a.active {
  color: var(--color-accent3);
}

.header-cta {
  padding: 10px 24px;
  font-size: 0.9rem;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  z-index: 1002;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: var(--transition);
  border-radius: 2px;
}

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

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

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

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-primary);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  opacity: 0;
  transition: var(--transition);
}

.mobile-nav.active {
  display: flex;
  opacity: 1;
}

.mobile-nav a {
  font-size: 1.4rem;
  color: var(--color-muted);
}

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

.mobile-lang-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 8px;
}

.mobile-lang-list a {
  font-size: 0.95rem;
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  padding: 140px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 140%;
  height: 200%;
  background: radial-gradient(ellipse at 50% 30%, rgba(62, 111, 151, 0.12) 0%, transparent 60%),
              radial-gradient(ellipse at 30% 60%, rgba(119, 144, 148, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(62, 111, 151, 0.15);
  border: 1px solid rgba(62, 111, 151, 0.3);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-accent3);
  margin-bottom: 28px;
}

.hero h1 {
  margin-bottom: 20px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero h1 span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-muted);
  max-width: 600px;
  margin: 0 auto 36px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ========================================
   Features Section
   ======================================== */
.features {
  padding: 100px 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 50px;
}

.feature-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(62, 111, 151, 0.4);
  box-shadow: var(--shadow-md);
  background: rgba(255, 255, 255, 0.05);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
  background: rgba(62, 111, 151, 0.15);
  color: var(--color-accent3);
}

.feature-card h3 {
  margin-bottom: 10px;
  color: var(--color-white);
}

.feature-card p {
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.features .btn-secondary {
  display: flex;
  margin: 0 auto;
  width: fit-content;
}

/* ========================================
   Use Cases Section
   ======================================== */
.use-cases {
  padding: 100px 0;
  background: var(--color-secondary);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.use-case-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}

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

.use-case-card:nth-child(1) .use-case-icon { background: rgba(62, 111, 151, 0.15); color: var(--color-accent3); }
.use-case-card:nth-child(2) .use-case-icon { background: rgba(119, 144, 148, 0.15); color: var(--color-accent2); }
.use-case-card:nth-child(3) .use-case-icon { background: rgba(186, 152, 151, 0.15); color: var(--color-accent); }
.use-case-card:nth-child(4) .use-case-icon { background: rgba(62, 111, 151, 0.15); color: var(--color-accent3); }

.use-case-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin: 0 auto 20px;
}

.use-case-card h3 {
  margin-bottom: 10px;
  color: var(--color-white);
}

.use-case-card p {
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ========================================
   Pricing Section
   ======================================== */
.pricing {
  padding: 100px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}

.pricing-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: var(--transition);
  position: relative;
}

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

.pricing-card.popular {
  border-color: var(--color-accent3);
  background: rgba(62, 111, 151, 0.08);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-cta);
  color: var(--color-white);
  padding: 6px 20px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-card h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  color: var(--color-white);
}

.pricing-card .price {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 4px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.pricing-card .price-period {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.pricing-features {
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 8px 0;
  font-size: 0.95rem;
  color: var(--color-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li i {
  font-size: 0.85rem;
}

.pricing-features li i.fa-check {
  color: var(--color-accent2);
}

.pricing-features li i.fa-xmark {
  color: #666;
}

.pricing-card .btn {
  width: 100%;
  justify-content: center;
}

/* ========================================
   Testimonials Section
   ======================================== */
.testimonials {
  padding: 100px 0;
  background: var(--color-secondary);
}

.testimonials-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-item .stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item .stat-label {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.testimonials-carousel {
  position: relative;
  overflow: hidden;
  margin-bottom: 40px;
}

.testimonials-track {
  display: flex;
  transition: transform 0.5s ease;
}

.testimonial-card {
  min-width: 100%;
  padding: 0 12px;
}

.testimonial-card-inner {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px;
  max-width: 700px;
  margin: 0 auto;
}

.testimonial-stars {
  color: #f5a623;
  font-size: 1rem;
  margin-bottom: 16px;
}

.testimonial-text {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-white);
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-white);
}

.testimonial-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.testimonial-role {
  color: var(--color-muted);
  font-size: 0.85rem;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.carousel-dot.active {
  background: var(--color-accent3);
  width: 28px;
  border-radius: 5px;
}

.testimonial-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 32px;
}

.testimonial-tag {
  padding: 6px 16px;
  background: rgba(62, 111, 151, 0.1);
  border: 1px solid rgba(62, 111, 151, 0.2);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-accent3);
}

/* ========================================
   Comparison Section
   ======================================== */
.comparison {
  padding: 100px 0;
}

.comparison-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

.comparison-table th,
.comparison-table td {
  padding: 18px 24px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}

.comparison-table th {
  background: rgba(255, 255, 255, 0.03);
  font-weight: 600;
  color: var(--color-white);
}

.comparison-table th:first-child,
.comparison-table td:first-child {
  text-align: left;
}

.comparison-table td {
  color: var(--color-muted);
}

.comparison-table .highlight {
  background: rgba(62, 111, 151, 0.08);
  color: var(--color-white);
  font-weight: 500;
}

.comparison-table .highlight .fa-check {
  color: var(--color-accent3);
  font-size: 1.1rem;
}

.comparison-table .fa-xmark {
  color: #555;
}

.comparison-table .fa-check {
  color: var(--color-accent2);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

/* ========================================
   FAQ Section
   ======================================== */
.faq {
  padding: 100px 0;
  background: var(--color-secondary);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: rgba(62, 111, 151, 0.3);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-white);
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--color-accent3);
}

.faq-question i {
  transition: var(--transition);
  color: var(--color-muted);
  font-size: 0.85rem;
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
  color: var(--color-accent3);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--color-muted);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* ========================================
   Final CTA Section
   ======================================== */
.final-cta {
  padding: 100px 0;
  background: var(--gradient-dark);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at center, rgba(62, 111, 151, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.final-cta .container {
  position: relative;
  z-index: 1;
}

.final-cta h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 16px;
  color: var(--color-white);
}

.final-cta p {
  font-size: 1.2rem;
  color: var(--color-muted);
  margin-bottom: 40px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: 60px 0 30px;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 40px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  margin-bottom: 12px;
}

.footer-brand p {
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}

.footer-col h4 {
  font-size: 0.95rem;
  margin-bottom: 16px;
  color: var(--color-white);
}

.footer-col a {
  display: block;
  padding: 4px 0;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.footer-col a:hover {
  color: var(--color-accent3);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
}

/* ========================================
   Back to Top
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-cta);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  border: none;
  box-shadow: var(--shadow-md);
  z-index: 998;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* ========================================
   Animations
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .use-cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu,
  .nav-right .header-cta,
  .nav-right .lang-switcher {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero h1 {
    font-size: 2rem;
  }

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

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

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .testimonials-stats {
    gap: 24px;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 12px 16px;
    font-size: 0.85rem;
  }

  .footer-content {
    flex-direction: column;
  }

  .footer-links {
    gap: 32px;
  }

  section {
    padding: 60px 0;
  }

  .final-cta {
    padding: 60px 0;
  }
}

@media (max-width: 480px) {
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn-large {
    width: 100%;
    justify-content: center;
  }
}