/* ==========================================================================
   SSTRADEPULSE - OFFICIAL FINTECH DESIGN SYSTEM
   High-Converting Algorithmic Trading Landing Page
   ========================================================================== */

:root {
  --bg-dark: #070a12;
  --bg-card: rgba(15, 23, 42, 0.7);
  --bg-card-hover: rgba(22, 36, 65, 0.85);
  --bg-elevated: #0f182e;
  
  --primary: #00f0ff;
  --primary-glow: rgba(0, 240, 255, 0.35);
  --secondary: #00e676;
  --secondary-glow: rgba(0, 230, 118, 0.35);
  --accent: #ff0055;
  --gold: #ffb800;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --border: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(0, 240, 255, 0.4);

  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-body);
}

body {
  overflow-x: hidden;
  line-height: 1.6;
  background: radial-gradient(circle at 50% 0%, rgba(0, 240, 255, 0.08) 0%, transparent 60%),
              radial-gradient(circle at 85% 30%, rgba(0, 230, 118, 0.05) 0%, transparent 50%),
              var(--bg-dark);
  min-height: 100vh;
}

/* Background grid overlay */
.bg-grid {
  position: fixed;
  inset: 0;
  background-size: 40px 40px;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  pointer-events: none;
  z-index: 0;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Typography */
h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-main);
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 20%, var(--primary) 70%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-cyan {
  background: linear-gradient(135deg, #00f0ff 0%, #0099ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 10, 18, 0.8);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  transition: var(--transition-fast);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #050811;
  font-weight: 900;
  box-shadow: 0 0 15px var(--primary-glow);
}

.brand-badge {
  font-size: 0.65rem;
  padding: 2px 8px;
  background: rgba(0, 240, 255, 0.15);
  border: 1px solid rgba(0, 240, 255, 0.3);
  border-radius: var(--radius-pill);
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-body);
  border-radius: var(--radius-pill);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #0099ff);
  color: #050811;
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(0, 240, 255, 0.55);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-emerald {
  background: linear-gradient(135deg, var(--secondary), #00b359);
  color: #050811;
  box-shadow: 0 4px 20px var(--secondary-glow);
}

.btn-emerald:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(0, 230, 118, 0.55);
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
}

/* Hero Section */
.hero {
  padding: 5rem 0 3.5rem;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.1rem;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 1.75rem;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.1);
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--secondary);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--secondary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4.2rem);
  letter-spacing: -1.5px;
  margin-bottom: 1.5rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 2.5rem;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* Live Terminal Card Showcase */
.dashboard-preview {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 1.75rem;
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.7),
              0 0 40px rgba(0, 240, 255, 0.08);
  position: relative;
  overflow: hidden;
}

.dashboard-preview::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), var(--secondary), transparent);
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}

.preview-dots {
  display: flex;
  gap: 6px;
}

.preview-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
}
.preview-dot.red { background: #ff5f56; }
.preview-dot.yellow { background: #ffbd2e; }
.preview-dot.green { background: #27c93f; }

.preview-title {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
  text-align: left;
}

.stat-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.35rem;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
}

.stat-value.green { color: var(--secondary); }
.stat-value.cyan { color: var(--primary); }

.preview-license-bar {
  background: rgba(0, 240, 255, 0.05);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.9rem;
}

.license-tag {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--primary);
}

/* Feature Sections */
.section {
  padding: 5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
  letter-spacing: 1.5px;
  margin-bottom: 0.75rem;
  display: block;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* Feature Cards Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: rgba(0, 240, 255, 0.3);
  box-shadow: 0 15px 35px -10px rgba(0, 240, 255, 0.15);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid rgba(0, 240, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 1.25rem;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.feature-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

/* Multi-Engine Selector */
.engines-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  backdrop-filter: blur(16px);
}

.engine-nav {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  padding-bottom: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.engine-btn {
  padding: 0.75rem 1.4rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--text-muted);
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-fast);
  font-family: var(--font-body);
}

.engine-btn.active, .engine-btn:hover {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.15);
}

.engine-content {
  display: none;
  grid-template-columns: 1.2fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.engine-content.active {
  display: grid;
  animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.engine-info h3 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.engine-info p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-size: 1rem;
}

.engine-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.engine-bullets li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: var(--text-main);
}

.bullet-check {
  color: var(--secondary);
  font-weight: bold;
}

.engine-card-metric {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

/* Steps / Installation Guide */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
}

.step-num {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: rgba(0, 240, 255, 0.2);
  line-height: 1;
  margin-bottom: 1rem;
}

.step-title {
  font-size: 1.2rem;
  margin-bottom: 0.65rem;
}

.step-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.5rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
  position: relative;
}

.pricing-card.featured {
  background: rgba(15, 25, 48, 0.85);
  border-color: var(--primary);
  box-shadow: 0 0 40px rgba(0, 240, 255, 0.15);
  transform: scale(1.03);
}

.featured-ribbon {
  position: absolute;
  top: -12px;
  right: 20px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #050811;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.5px;
}

.plan-name {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.plan-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  min-height: 40px;
  margin-bottom: 1.5rem;
}

.plan-price {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.plan-period {
  font-size: 1rem;
  color: var(--text-dim);
  font-weight: 400;
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--text-main);
}

/* FAQ Accordion */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-fast);
}

.faq-item.active {
  border-color: rgba(0, 240, 255, 0.35);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-icon {
  font-size: 1.25rem;
  transition: transform 0.3s ease;
  color: var(--primary);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 1.5rem 1.25rem;
}

/* Floating Contact Bubble */
.floating-contact {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.float-btn {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-decoration: none;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
  transition: var(--transition-smooth);
}

.float-btn:hover {
  transform: translateY(-4px) scale(1.08);
}

.float-btn.telegram {
  background: linear-gradient(135deg, #0088cc, #00aaff);
  box-shadow: 0 4px 20px rgba(0, 136, 204, 0.4);
}

.float-btn.whatsapp {
  background: linear-gradient(135deg, #25d366, #128c7e);
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(5, 8, 17, 0.85);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal.active {
  display: flex;
}

.modal-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 100%;
  padding: 2.25rem;
  position: relative;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.8),
              0 0 30px rgba(0, 240, 255, 0.15);
  animation: modalPop 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalPop {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 4rem 0 2rem;
  margin-top: 5rem;
  background: rgba(5, 8, 15, 0.95);
  color: var(--text-dim);
  font-size: 0.9rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand h4 {
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.footer-col h5 {
  color: var(--text-main);
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-col a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Responsive */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .engine-content { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .pricing-card.featured { transform: none; }
}