/* ==========================================================================
   KobPay — Design System & Base Styles
   ========================================================================== */

:root {
  /* Colors */
  --color-bg: #08070c;
  --color-surface: #0f0e17;
  --color-surface-2: #141322;
  --color-surface-light: #ffffff;
  --color-text: #1a1a24;
  --color-text-muted: #5f5f72;
  --color-text-on-dark: #f5f4fa;
  --color-text-on-dark-muted: #b3b0c4;

  --color-primary: #0b7cff;
  --color-primary-dark: #043b8f;
  --color-teal: #17e0b3;
  --color-pink: #ff5da2;
  --color-yellow: #ffc857;
  --color-blue: #4da6ff;
  --color-green: #2fd06d;

  --gradient-brand: linear-gradient(135deg, #0b7cff 0%, #17e0b3 100%);
  --gradient-brand-soft: linear-gradient(135deg, rgba(11,124,255,0.15) 0%, rgba(23,224,179,0.15) 100%);
  --gradient-dark: radial-gradient(120% 120% at 20% 0%, #0b7cff 0%, #063a8c 42%, #031634 100%);

  /* Layout */
  --max-width: 1200px;
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-full: 999px;

  /* Shadows */
  --shadow-soft: 0 20px 60px -20px rgba(20, 15, 50, 0.25);
  --shadow-card: 0 12px 30px -12px rgba(20, 15, 50, 0.18);
  --shadow-glow: 0 0 80px rgba(11, 124, 255, 0.35);

  /* Type */
  --font-display: 'Plus Jakarta Sans', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  --transition-fast: 0.2s ease;
  --transition-med: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-surface-light);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  margin: 0 0 0.5em 0;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

p { margin: 0 0 1em 0; color: var(--color-text-muted); line-height: 1.7; }

a { color: inherit; text-decoration: none; }

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

ul { list-style: none; margin: 0; padding: 0; }

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

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

/* Focus visibility for accessibility */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  font-family: var(--font-display);
  cursor: pointer;
  border: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: 0 10px 25px -8px rgba(11, 124, 255, 0.55);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 32px -8px rgba(11, 124, 255, 0.65); }

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid rgba(20, 15, 50, 0.12);
}
.btn-ghost:hover { background: rgba(11, 124, 255, 0.06); border-color: rgba(11,124,255,0.3); }

.btn-lg { padding: 15px 28px; font-size: 1rem; }

/* ==========================================================================
   Header / Nav
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(20, 15, 50, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-text);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 11px;
  background: var(--gradient-brand);
  color: #fff;
  font-size: 0.95rem;
}

.main-nav {
  display: flex;
  gap: 32px;
  flex: 1;
  justify-content: center;
}

.main-nav a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}
.main-nav a:hover { color: var(--color-text); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  margin: 0 auto;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px 24px 20px;
  background: rgba(255,255,255,0.98);
  border-top: 1px solid rgba(20,15,50,0.06);
}
.mobile-nav a {
  padding: 12px 4px;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid rgba(20,15,50,0.05);
}
.mobile-nav .mobile-cta {
  margin-top: 12px;
  justify-content: center;
  border-bottom: none;
}
.mobile-nav.open { display: flex; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  background: var(--gradient-dark);
  overflow: hidden;
  padding: 90px 0 70px;
}

.hero-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(77,166,255,0.45) 0%, rgba(23,224,179,0.12) 45%, transparent 70%);
  filter: blur(20px);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 48px;
  position: relative;
  z-index: 1;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-teal);
  background: rgba(23, 224, 179, 0.1);
  border: 1px solid rgba(23, 224, 179, 0.25);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  color: var(--color-text-on-dark);
  margin-bottom: 20px;
}

.hero-sub {
  color: var(--color-text-on-dark-muted);
  font-size: 1.1rem;
  max-width: 520px;
  margin-bottom: 32px;
}

.hero-cta-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.hero .btn-ghost {
  color: var(--color-text-on-dark);
  border-color: rgba(255,255,255,0.18);
}
.hero .btn-ghost:hover { background: rgba(255,255,255,0.06); }

.hero-store-badges {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.store-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  color: var(--color-text-on-dark);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.store-badge i { font-size: 1.4rem; }
.store-badge span { display: flex; flex-direction: column; line-height: 1.2; }
.store-badge small { font-size: 0.65rem; font-weight: 400; color: var(--color-text-on-dark-muted); }
.store-badge:hover { background: rgba(255,255,255,0.12); transform: translateY(-2px); }

.hero-trust-row {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-text-on-dark-muted);
}
.trust-item i { color: var(--color-teal); }

/* Hero visual / phone mockups */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 480px;
}

.phone-stack {
  position: relative;
  width: 100%;
  max-width: 380px;
}

.phone-img {
  border-radius: 32px;
  box-shadow: 0 40px 80px -20px rgba(0,0,0,0.6);
}

.phone-back {
  position: absolute;
  width: 68%;
  right: -4%;
  top: 6%;
  opacity: 0.85;
  transform: rotate(6deg);
  z-index: 1;
  filter: brightness(0.85);
}

.phone-front {
  position: relative;
  width: 82%;
  margin: 0 auto;
  z-index: 2;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

.float-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(20, 18, 34, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px;
  padding: 12px 16px;
  box-shadow: var(--shadow-soft);
  z-index: 3;
  animation: float 6s ease-in-out infinite;
}
.float-card i {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-brand);
  color: #fff;
  font-size: 0.95rem;
  flex-shrink: 0;
}
.float-card strong { display: block; font-size: 0.85rem; color: var(--color-text-on-dark); }
.float-card span { font-size: 0.78rem; color: var(--color-text-on-dark-muted); }

.float-card-1 { top: 12%; left: -8%; animation-delay: 0.5s; }
.float-card-2 { bottom: 8%; right: -6%; animation-delay: 1.2s; }

/* ==========================================================================
   Strip (category quick icons)
   ========================================================================== */
.strip {
  background: var(--color-surface-light);
  border-bottom: 1px solid rgba(20,15,50,0.06);
  padding: 24px 0;
}
.strip-inner {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}
.strip-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}
.strip-item i { color: var(--color-primary); font-size: 1.1rem; }

/* ==========================================================================
   Section Head (reusable)
   ========================================================================== */
.section-head {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 56px;
}
.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: rgba(11, 124, 255, 0.08);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}
.section-tag-light {
  color: var(--color-teal);
  background: rgba(23, 224, 179, 0.12);
}
.section-head h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
}
.section-head p { font-size: 1.05rem; }

/* ==========================================================================
   Benefits
   ========================================================================== */
.benefits { padding: 100px 0; background: var(--color-surface-light); }

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

.benefit-card {
  padding: 32px 28px;
  border-radius: var(--radius-md);
  background: #fbfaff;
  border: 1px solid rgba(20,15,50,0.06);
  transition: transform var(--transition-med), box-shadow var(--transition-med);
}
.benefit-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

.benefit-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-brand-soft);
  color: var(--color-primary);
  font-size: 1.3rem;
  margin-bottom: 20px;
}

.benefit-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.benefit-card p { font-size: 0.95rem; margin-bottom: 0; }

/* ==========================================================================
   Categories
   ========================================================================== */
.categories { padding: 100px 0; background: #f7f6fc; }

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

.category-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 32px 28px;
  border: 1px solid rgba(20,15,50,0.06);
  transition: transform var(--transition-med), box-shadow var(--transition-med);
}
.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

.category-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 20px;
  color: #fff;
}
.icon-yellow { background: linear-gradient(135deg, #ffc857, #ff9f45); }
.icon-sky { background: linear-gradient(135deg, #0b7cff, #043b8f); }
.icon-teal   { background: linear-gradient(135deg, #17e0b3, #0eb894); }
.icon-pink   { background: linear-gradient(135deg, #ff5da2, #ff3d7f); }
.icon-blue   { background: linear-gradient(135deg, #4da6ff, #2f7fe0); }
.icon-green  { background: linear-gradient(135deg, #2fd06d, #1fae57); }

.category-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.category-card p { font-size: 0.95rem; margin-bottom: 0; }

/* ==========================================================================
   How it works
   ========================================================================== */
.how-it-works { padding: 100px 0; background: var(--color-surface-light); }

.steps-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: start;
  gap: 12px;
}

.step-card {
  padding: 8px;
  text-align: center;
}

.step-number {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
  background: var(--gradient-brand);
}

.step-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.step-card p { font-size: 0.92rem; max-width: 260px; margin: 0 auto; }

.step-connector {
  height: 2px;
  width: 100%;
  margin-top: 28px;
  background: repeating-linear-gradient(90deg, rgba(11,124,255,0.35) 0 8px, transparent 8px 16px);
}

/* ==========================================================================
   Security
   ========================================================================== */
.security {
  padding: 100px 0;
  background: var(--gradient-dark);
  color: var(--color-text-on-dark);
}

.security-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.security-copy h2 { color: var(--color-text-on-dark); }
.security-copy p { color: var(--color-text-on-dark-muted); font-size: 1.05rem; }

.security-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 32px;
}
.security-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.security-list i {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(23, 224, 179, 0.12);
  color: var(--color-teal);
  font-size: 1.1rem;
}
.security-list strong { display: block; color: var(--color-text-on-dark); margin-bottom: 4px; font-size: 1rem; }
.security-list span { font-size: 0.9rem; color: var(--color-text-on-dark-muted); }

.security-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 360px;
}
.security-orb {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(11,124,255,0.5), rgba(23,224,179,0.15) 60%, transparent 80%);
  filter: blur(2px);
  animation: pulse 4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.9; }
  50% { transform: scale(1.06); opacity: 1; }
}
.security-icon-badge {
  position: absolute;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: rgba(20, 18, 34, 0.85);
  border: 1px solid rgba(255,255,255,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  color: var(--color-teal);
  box-shadow: 0 0 60px rgba(23,224,179,0.35);
}

/* ==========================================================================
   Download CTA
   ========================================================================== */
.download-cta {
  position: relative;
  padding: 110px 0;
  text-align: center;
  background: linear-gradient(135deg, #0b7cff 0%, #063a8c 62%, #031634 100%);
  overflow: hidden;
}
.download-glow {
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(255,255,255,0.18) 0%, transparent 65%);
  pointer-events: none;
}
.download-inner { position: relative; z-index: 1; }
.download-cta h2 { color: #fff; font-size: clamp(1.9rem, 4vw, 2.6rem); }
.download-cta p {
  color: rgba(255,255,255,0.88);
  max-width: 560px;
  margin: 0 auto 36px;
  font-size: 1.05rem;
}
.download-badges { justify-content: center; margin-bottom: 20px; }
.download-cta .store-badge {
  background: rgba(255,255,255,0.14);
  border-color: rgba(255,255,255,0.3);
}
.download-cta .store-badge:hover { background: rgba(255,255,255,0.22); }
.download-note {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  margin: 0;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: #0b0a12;
  color: var(--color-text-on-dark-muted);
  padding: 72px 0 24px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .brand { color: var(--color-text-on-dark); margin-bottom: 16px; }
.footer-brand p { max-width: 280px; font-size: 0.9rem; }

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}
.footer-social a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.footer-social a:hover { background: var(--gradient-brand); transform: translateY(-3px); }

.footer-links { display: flex; flex-direction: column; gap: 12px; }
.footer-links h4 {
  color: var(--color-text-on-dark);
  font-size: 0.95rem;
  margin-bottom: 6px;
}
.footer-links a { font-size: 0.9rem; transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--color-text-on-dark); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 24px;
  font-size: 0.82rem;
}
.footer-disclaimer { max-width: 420px; text-align: right; }

.scroll-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 120;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: var(--gradient-brand);
  box-shadow: 0 16px 32px -12px rgba(3, 22, 52, 0.6);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}
.scroll-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.scroll-top:hover {
  box-shadow: 0 20px 36px -12px rgba(3, 22, 52, 0.75);
  transform: translateY(-2px);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; min-height: 420px; margin-bottom: 8px; }
  .benefit-grid, .category-grid { grid-template-columns: repeat(2, 1fr); }
  .security-inner { grid-template-columns: 1fr; }
  .security-visual { order: -1; min-height: 260px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .main-nav, .header-actions { display: none; }
  .nav-toggle { display: flex; }
  .steps-grid { grid-template-columns: 1fr; }
  .step-connector { display: none; }
  .step-card { max-width: 320px; margin: 0 auto; }
}

@media (max-width: 640px) {
  .container { padding: 0 20px; }
  .hero { padding: 60px 0 50px; }
  .hero-copy h1 { font-size: 2.1rem; }
  .hero-cta-row { flex-direction: column; align-items: stretch; }
  .hero-cta-row .btn { justify-content: center; }
  .hero-store-badges { justify-content: center; }
  .hero-trust-row { justify-content: center; text-align: center; }
  .benefit-grid, .category-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-disclaimer { text-align: left; }
  .strip-inner { gap: 20px; justify-content: flex-start; overflow-x: auto; padding-bottom: 4px; }
  .float-card { padding: 8px 12px; }
  .float-card strong { font-size: 0.75rem; }
  .float-card span { font-size: 0.68rem; }
  .scroll-top { right: 18px; bottom: 18px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .phone-front, .float-card, .security-orb { animation: none; }
  html { scroll-behavior: auto; }
}

/* ==========================================================================
   Scroll reveal animation
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}