/* ========================================
   Boostive Support Page
   Design: Modern minimal + subtle glass
   Typography: Plus Jakarta Sans
   Spacing: 8px unit system
   ======================================== */

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

:root {
  /* Colors - Light */
  --color-primary: #4A90D9;
  --color-primary-light: #6BA5E3;
  --color-primary-dark: #3A78C2;
  --color-primary-bg: #EBF3FB;
  --color-accent: #F5A623;
  --color-bg: #FAFBFE;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FFFFFF;
  --color-text: #1A2332;
  --color-text-secondary: #5A6B80;
  --color-text-muted: #8A96A6;
  --color-border: #E2E8F0;
  --color-border-light: #F0F3F7;
  --color-energy-blue: #4A90D9;
  --color-energy-orange: #F5A623;
  --color-energy-red: #E55B5B;

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-blur: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(26, 35, 50, 0.06);
  --shadow-md: 0 4px 16px rgba(26, 35, 50, 0.08);
  --shadow-lg: 0 8px 32px rgba(26, 35, 50, 0.1);
  --shadow-card: 0 2px 12px rgba(74, 144, 217, 0.06);

  /* Spacing */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --sp-20: 80px;
  --sp-24: 96px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 200ms;
  --duration-slow: 350ms;
}

/* --- Dark Mode --- */
[data-theme="dark"] {
  --color-bg: #0F1621;
  --color-surface: #1A2332;
  --color-surface-elevated: #212D3F;
  --color-text: #F0F4F8;
  --color-text-secondary: #A0AEBF;
  --color-text-muted: #6B7A8D;
  --color-border: #2A3648;
  --color-border-light: #1E2B3C;
  --color-primary-bg: #1A2A42;
  --glass-bg: rgba(26, 35, 50, 0.7);
  --glass-border: rgba(42, 54, 72, 0.5);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.15);
}

/* --- Base Styles --- */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--sp-8);
  }
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: var(--sp-3) var(--sp-4);
  transition: background var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}

.nav.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--glass-border);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-2) var(--sp-4);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 700;
  font-size: 18px;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  padding: var(--sp-1) var(--sp-3);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: all var(--duration) var(--ease);
}

.lang-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.lang-option {
  transition: color var(--duration) var(--ease);
}

.lang-option.active {
  color: var(--color-primary);
}

.lang-divider {
  color: var(--color-border);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--duration) var(--ease);
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

/* --- Hero --- */
.hero {
  position: relative;
  padding: calc(var(--sp-24) + var(--sp-16)) 0 var(--sp-16);
  text-align: center;
  overflow: hidden;
}

@media (min-width: 768px) {
  .hero {
    padding: calc(var(--sp-24) + var(--sp-20)) 0 var(--sp-20);
  }
}

.hero-bg-orbs {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
}

[data-theme="dark"] .orb {
  opacity: 0.15;
}

.orb-1 {
  width: 400px;
  height: 400px;
  background: var(--color-primary);
  top: -100px;
  right: -100px;
}

.orb-2 {
  width: 300px;
  height: 300px;
  background: var(--color-energy-orange);
  bottom: -50px;
  left: -80px;
}

.orb-3 {
  width: 200px;
  height: 200px;
  background: var(--color-primary-light);
  top: 40%;
  left: 50%;
  transform: translateX(-50%);
}

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

.hero-badge {
  display: inline-block;
  padding: var(--sp-1) var(--sp-4);
  background: var(--color-primary-bg);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: var(--sp-6);
}

.hero-title {
  font-size: clamp(40px, 8vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--sp-4);
}

.hero-subtitle {
  font-size: clamp(18px, 3vw, 22px);
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: var(--sp-4);
}

.hero-desc {
  font-size: clamp(15px, 2vw, 17px);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto var(--sp-8);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--radius-full);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all var(--duration) var(--ease);
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(74, 144, 217, 0.3);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 4px 16px rgba(74, 144, 217, 0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.btn-lg {
  padding: var(--sp-4) var(--sp-8);
  font-size: 16px;
}

/* --- Sections --- */
.section {
  padding: var(--sp-16) 0;
}

@media (min-width: 768px) {
  .section {
    padding: var(--sp-20) 0;
  }
}

.section-header {
  text-align: center;
  margin-bottom: var(--sp-12);
}

.section-label {
  display: inline-block;
  padding: var(--sp-1) var(--sp-3);
  background: var(--color-primary-bg);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--sp-4);
}

.section-title {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--sp-4);
}

.section-desc {
  font-size: clamp(15px, 2vw, 17px);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.6;
}

/* --- Screenshots Carousel --- */
.screenshots {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.carousel-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.carousel {
  overflow: hidden;
  border-radius: var(--radius-lg);
  flex: 1;
}

.carousel-track {
  display: flex;
  transition: transform var(--duration-slow) var(--ease);
  will-change: transform;
}

.carousel-slide {
  flex: 0 0 100%;
  display: flex;
  justify-content: center;
  padding: 0 var(--sp-2);
}

.carousel-slide img {
  width: 100%;
  max-width: 260px;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}

.carousel-slide img:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.carousel-btn {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  box-shadow: var(--shadow-sm);
}

.carousel-btn:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
}

.carousel-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.carousel-caption {
  text-align: center;
  margin-top: var(--sp-6);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  min-height: 24px;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: var(--sp-2);
  margin-top: var(--sp-4);
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-border);
  border: none;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  padding: 0;
}

.carousel-dot:hover {
  background: var(--color-primary-light);
}

.carousel-dot.active {
  background: var(--color-primary);
  width: 24px;
}

/* --- Features Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-6);
}

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

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.feature-card {
  padding: var(--sp-6);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  transition: all var(--duration) var(--ease);
}

.feature-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--sp-4);
  color: #FFFFFF;
}

.feature-icon-energy { background: var(--color-energy-blue); }
.feature-icon-priority { background: #6C5CE7; }
.feature-icon-views { background: #00B894; }
.feature-icon-calendar { background: var(--color-energy-orange); }
.feature-icon-stats { background: #E55B5B; }
.feature-icon-themes { background: #A29BFE; }
.feature-icon-sync { background: #0984E3; }
.feature-icon-notify { background: #FDCB6E; color: #5A4600; }

.feature-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--sp-2);
}

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

/* --- FAQ --- */
.faq {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

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

.faq-item[open] {
  border-color: var(--color-primary);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4) var(--sp-5);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  transition: color var(--duration) var(--ease);
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: '';
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-left: var(--sp-4);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%235A6B80' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  transition: transform var(--duration) var(--ease);
}

.faq-item[open] .faq-question::after {
  transform: rotate(180deg);
}

.faq-item[open] .faq-question {
  color: var(--color-primary);
}

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

.faq-answer {
  padding: 0 var(--sp-5) var(--sp-5);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* --- Contact --- */
.contact-card {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: var(--sp-12) var(--sp-8);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-md);
}

.contact-btn {
  margin-top: var(--sp-6);
}

.contact-note {
  margin-top: var(--sp-4);
  font-size: 13px;
  color: var(--color-text-muted);
}

/* --- Footer --- */
.footer {
  padding: var(--sp-8) 0;
  border-top: 1px solid var(--color-border-light);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-5);
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 700;
  font-size: 16px;
  color: var(--color-text);
}

.footer-logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-link {
  font-size: 14px;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--duration) var(--ease);
}

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

.footer-copy {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* --- Animations --- */
@media (prefers-reduced-motion: no-preference) {
  .fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
  }

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

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }

  .carousel-track {
    transition: none;
  }
}

/* --- Utility --- */
@media (max-width: 639px) {
  .carousel-btn {
    display: none;
  }

  .carousel {
    border-radius: var(--radius-md);
  }

  .carousel-slide img {
    max-width: 220px;
  }
}