/* ==========================================================================
   PlanUP – Landing Page Design System
   Aesthetic: Cyberpunk Deep Space Dark with Neon Cyan & Ultraviolet Accents
   ========================================================================== */

:root {
  /* Authentic PlanUP Gaming/Productivity Palette */
  --bg-primary: #0B0E14;
  --bg-secondary: rgba(22, 27, 40, 0.7);
  --bg-hover: rgba(35, 45, 65, 0.8);
  --card-bg: linear-gradient(160deg, rgba(17, 24, 39, 0.92) 0%, rgba(10, 14, 23, 0.96) 100%);
  --card-bg-hover: linear-gradient(160deg, rgba(22, 31, 50, 0.95) 0%, rgba(13, 18, 30, 0.98) 100%);
  
  --cyan: #00F0FF;
  --cyan-glow: rgba(0, 240, 255, 0.35);
  --cyan-dim: rgba(0, 240, 255, 0.1);
  --cyan-border: rgba(0, 240, 255, 0.2);
  --cyan-border-hover: rgba(0, 240, 255, 0.45);
  
  --purple: #8A2BE2;
  --purple-glow: rgba(138, 43, 226, 0.35);
  --purple-dim: rgba(138, 43, 226, 0.12);
  --purple-border: rgba(138, 43, 226, 0.25);
  
  --mint: #00FF85;
  --mint-dim: rgba(0, 255, 133, 0.1);
  
  --text-main: #FFFFFF;
  --text-sub: #94A3B8;
  --text-muted: #64748B;
  --border-subtle: rgba(255, 255, 255, 0.08);
  
  /* Fonts */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Layout */
  --max-w: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;
  
  /* Transitions */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 0.25s;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  background-image: 
    linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: rgba(0, 240, 255, 0.25);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--cyan);
}

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

.gradient-text {
  background: linear-gradient(135deg, #00F0FF 0%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  text-shadow: 0 0 24px rgba(0, 240, 255, 0.2);
}

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.3px;
  padding: 13px 26px;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: #00F0FF;
  color: #0B0E14;
  font-weight: 700;
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.35);
  border: 1px solid rgba(0, 240, 255, 0.5);
}

.btn-primary:hover {
  background: #33f3ff;
  transform: translateY(-2px);
  box-shadow: 0 0 26px rgba(0, 240, 255, 0.55);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  background: rgba(0, 240, 255, 0.08);
  border-color: var(--cyan-border);
  color: var(--cyan);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 13px;
}

/* Nav Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 8, 14, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--duration) ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-avatar {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
  border: 1px solid var(--cyan-border);
  box-shadow: 0 0 14px var(--cyan-glow);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #fff;
}

.brand-title span {
  color: var(--cyan);
}

.brand-tagline {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: -2px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  color: var(--text-sub);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color var(--duration) ease;
}

.nav-link:hover {
  color: var(--cyan);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.github-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-sub);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  transition: all var(--duration) ease;
}

.github-link:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.04);
}

/* Hero Section */
.hero-section {
  padding: 90px 0 110px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 50px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--cyan-border);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  color: var(--cyan);
  margin-bottom: 24px;
  letter-spacing: 0.4px;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--cyan);
  animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
  font-size: 54px;
  font-weight: 800;
  letter-spacing: -1.2px;
  line-height: 1.1;
  margin-bottom: 22px;
}

.hero-desc {
  font-size: 17px;
  color: var(--text-sub);
  line-height: 1.65;
  max-width: 540px;
  margin-bottom: 34px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.trust-strip {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  flex-wrap: wrap;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.trust-item svg {
  color: var(--mint);
}

/* Hero Showcase Visual */
.hero-visual {
  position: relative;
}

.hero-card-stack {
  position: relative;
  width: 100%;
}

.hero-main-card {
  max-width: 440px;
  margin: 0 auto;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-xl);
  padding: 16px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.65), 0 0 40px rgba(0, 240, 255, 0.15);
  position: relative;
  z-index: 2;
  transition: transform 0.4s var(--ease);
}

.hero-main-card:hover {
  transform: translateY(-4px);
}

.hero-img-main {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.hero-floating-card {
  position: absolute;
  bottom: -28px;
  right: -20px;
  width: 82%;
  background: rgba(11, 15, 25, 0.94);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--purple-border);
  border-radius: var(--radius-lg);
  padding: 12px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 35px var(--purple-glow);
  z-index: 3;
  animation: floatSubtle 5s ease-in-out infinite alternate;
}

@keyframes floatSubtle {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-10px); }
}

.hero-floating-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  display: block;
}

/* Section Header Generic */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-eyebrow {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--cyan);
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 38px;
  font-weight: 800;
  letter-spacing: -0.8px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-sub);
  line-height: 1.6;
}

/* ==========================================================================
   Showcase Section: "PlanUP in Action" (The 3 Wide Cards)
   ========================================================================== */
.showcase-section {
  padding: 80px 0 100px;
  position: relative;
}

.action-cards-grid {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.action-card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 44px 48px;
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 50px;
  align-items: center;
  position: relative;
  overflow: hidden;
  transition: all var(--duration) var(--ease);
}

.action-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0;
  transition: opacity var(--duration) ease;
}

.action-card:hover {
  border-color: var(--cyan-border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(0, 240, 255, 0.12);
}

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

.action-card.reverse {
  grid-template-columns: 1.1fr 1fr;
}

.action-card.reverse .action-content {
  order: 2;
}

.action-card.reverse .action-visual {
  order: 1;
}

.action-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--cyan);
  background: var(--cyan-dim);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.action-tag.purple-tag {
  color: var(--purple);
  background: var(--purple-dim);
}

.action-tag.mint-tag {
  color: var(--mint);
  background: var(--mint-dim);
}

.action-title {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.2;
}

.action-desc {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.65;
  margin-bottom: 26px;
}

.action-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.action-pill-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  padding: 7px 14px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
}

.action-pill-item svg {
  color: var(--cyan);
  flex-shrink: 0;
}

/* Action Visual Frame */
.mockup-window {
  background: rgba(8, 11, 20, 0.95);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.65);
  position: relative;
  transition: transform var(--duration) ease;
}

.mockup-header {
  background: rgba(255, 255, 255, 0.03);
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 8px;
}

.mockup-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}

.mockup-dot.red { background: #ff5f56; }
.mockup-dot.yellow { background: #ffbd2e; }
.mockup-dot.green { background: #27c93f; }

.mockup-url-bar {
  flex: 1;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 4px;
  height: 18px;
  margin-left: 10px;
  font-size: 10px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  padding: 0 8px;
}

.mockup-body {
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mockup-body img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  display: block;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.dual-mockup-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ==========================================================================
   Core Features Grid
   ========================================================================== */
.features-section {
  padding: 80px 0 100px;
  background: linear-gradient(180deg, transparent 0%, rgba(11, 15, 25, 0.6) 50%, transparent 100%);
}

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

.feature-card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--duration) var(--ease);
  position: relative;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-border);
  background: var(--card-bg-hover);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4), 0 0 24px rgba(0, 240, 255, 0.08);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--cyan-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  margin-bottom: 22px;
}

.feature-icon-box.purple-box {
  background: rgba(139, 92, 246, 0.08);
  border-color: var(--purple-border);
  color: var(--purple);
}

.feature-icon-box.mint-box {
  background: rgba(0, 255, 133, 0.08);
  border-color: rgba(0, 255, 133, 0.25);
  color: var(--mint);
}

.feature-heading {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-body {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.6;
}

/* ==========================================================================
   How It Works (3 Steps)
   ========================================================================== */
.how-section {
  padding: 80px 0 100px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  position: relative;
}

.step-card {
  background: var(--card-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  transition: transform var(--duration) ease;
}

.step-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-border);
}

.step-num {
  font-family: var(--font-heading);
  font-size: 44px;
  font-weight: 800;
  color: rgba(0, 240, 255, 0.3);
  line-height: 1;
  margin-bottom: 18px;
}

.step-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.step-desc {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.6;
}

/* ==========================================================================
   Audience Section: "Built For Driven Learners"
   ========================================================================== */
.audience-section {
  padding: 80px 0 100px;
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.audience-card {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: left;
  transition: all var(--duration) ease;
}

.audience-card:hover {
  border-color: var(--cyan-border);
  background: rgba(15, 23, 42, 0.85);
  transform: translateY(-3px);
}

.audience-badge-icon {
  width: 38px;
  height: 38px;
  margin-bottom: 16px;
  display: block;
}

.audience-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.audience-text {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.5;
}

/* ==========================================================================
   FAQ Section (Accordion)
   ========================================================================== */
.faq-section {
  padding: 80px 0 100px;
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item.active {
  border-color: var(--cyan-border);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  text-align: left;
  color: #fff;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-icon-chevron {
  width: 18px;
  height: 18px;
  color: var(--cyan);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.6;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 220px;
  padding-bottom: 22px;
}

/* ==========================================================================
   Bottom CTA Banner
   ========================================================================== */
.bottom-cta-section {
  padding: 80px 0 100px;
}

.cta-box {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.9) 0%, rgba(17, 24, 39, 0.95) 100%);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.6), 0 0 50px rgba(0, 240, 255, 0.12);
}

.cta-box::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--purple), transparent);
}

.cta-box h2 {
  font-size: 38px;
  margin-bottom: 16px;
}

.cta-box p {
  color: var(--text-sub);
  font-size: 16px;
  max-width: 540px;
  margin: 0 auto 32px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 50px 0 36px;
  background: rgba(6, 8, 14, 0.95);
  font-size: 13px;
  color: var(--text-muted);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-nav {
  display: flex;
  gap: 24px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--text-sub);
  text-decoration: none;
  transition: color var(--duration) ease;
}

.footer-nav a:hover {
  color: var(--cyan);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  flex-wrap: wrap;
  gap: 14px;
}

.author-link {
  color: var(--cyan);
  text-decoration: none;
  font-weight: 600;
}

/* Responsive */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-cta-group, .trust-strip {
    justify-content: center;
  }
  .action-card, .action-card.reverse {
    grid-template-columns: 1fr;
    padding: 34px 28px;
    gap: 34px;
  }
  .action-card.reverse .action-content { order: 1; }
  .action-card.reverse .action-visual { order: 2; }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .audience-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .hero-title {
    font-size: 38px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .audience-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }
}