/* ============================================
   vpn_c1_ember — Archetype C "Minimal"
   Warm dark theme · Ultra-clean · Ember palette
   ============================================ */

/* --- CSS Variables --- */
:root {
  --primary-color: #6d4aff;
  --secondary-color: #00d4aa;

  --bg-deep: #1a1015;
  --bg-raised: #221a1e;
  --bg-surface: #2a2024;
  --bg-hover: #342a2e;

  --text-primary: #f5f0eb;
  --text-secondary: #bfb5ac;
  --text-muted: #8a7e76;

  --accent: var(--primary-color);
  --accent-hover: var(--secondary-color);
  --accent-glow: rgba(232, 140, 50, 0.15);
  --accent-border: rgba(232, 140, 50, 0.3);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --font-stack: "Rubik", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC",
    "Microsoft YaHei", sans-serif;

  --max-width: 780px;
  --max-width-wide: 960px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 3.5rem;
  --spacing-xl: 6rem;
  --spacing-2xl: 8.5rem;
}


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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-deep);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-hover);
}

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

ul {
  list-style: none;
}


/* ============================================
   Navigation — Ultra-minimal
   ============================================ */
.dk-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 2rem;
  background: rgba(26, 16, 21, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(245, 240, 235, 0.06);
}

.dk-home-link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.dk-home-link:hover {
  color: var(--accent);
}

.dk-mark {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  object-fit: contain;
}

.dk-topbar-cta {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--bg-deep);
  background: var(--accent);
  border-radius: var(--radius-sm);
  transition: background 0.2s ease, transform 0.15s ease;
}

.dk-topbar-cta:hover {
  color: var(--bg-deep);
  background: var(--accent-hover);
  transform: translateY(-1px);
}


/* ============================================
   Main Content
   ============================================ */
.dk-main {
  padding-top: 60px;
}


/* ============================================
   Hero — Splash
   ============================================ */
.dk-splash {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 85vh;
  padding: var(--spacing-2xl) 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.dk-splash-heading {
  font-size: clamp(2.25rem, 5.5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.dk-splash-sub {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: var(--spacing-lg);
}

.dk-splash-btn {
  display: inline-block;
  padding: 0.9rem 2.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--bg-deep);
  background: var(--accent);
  border-radius: var(--radius-md);
  transition: background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 24px var(--accent-glow);
}

.dk-splash-btn:hover {
  color: var(--bg-deep);
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}

/* === Download Buttons Grid === */
.dk-download-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 16px;
}
.dk-download-btns .dk-splash-btn {
  flex: 1 1 auto;
  white-space: nowrap;
  text-align: center;
  padding: 14px 16px;
  font-size: 0.875rem;
}
@media (max-width: 768px) {
  .dk-download-btns {
    flex-direction: column;
    align-items: stretch;
  }
  .dk-download-btns .dk-splash-btn {
    max-width: 100%;
    width: 100%;
  }
}


/* ============================================
   Pricing — 2 Tier
   ============================================ */
.dk-plans {
  padding: var(--spacing-2xl) 2rem;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  text-align: center;
}

.dk-plans-heading {
  font-size: clamp(1.5rem, 3.5vw, 2.125rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
}

.dk-plan-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: var(--spacing-lg);
}

.dk-plan-box {
  position: relative;
  background: var(--bg-raised);
  border: 1px solid rgba(245, 240, 235, 0.07);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: left;
  transition: border-color 0.25s ease, transform 0.2s ease;
}

.dk-plan-box:hover {
  border-color: var(--accent-border);
  transform: translateY(-3px);
}

.dk-plan-box--featured {
  background: var(--bg-surface);
  border-color: var(--accent-border);
  box-shadow: 0 8px 40px var(--accent-glow);
}

.dk-plan-badge {
  position: absolute;
  top: -11px;
  right: 1.5rem;
  display: inline-block;
  padding: 0.25rem 0.875rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--bg-deep);
  background: var(--accent);
  border-radius: 50px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.dk-plan-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.dk-plan-price {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.dk-plan-perks {
  margin-bottom: 2rem;
}

.dk-plan-perks li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 2;
}

.dk-plan-perks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0.7;
}

.dk-plan-btn {
  display: block;
  width: 100%;
  padding: 0.8rem 0;
  text-align: center;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent);
  background: transparent;
  border: 2px solid var(--accent-border);
  border-radius: var(--radius-md);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.dk-plan-btn:hover {
  color: var(--bg-deep);
  background: var(--accent);
  border-color: var(--accent);
}

.dk-plan-btn--featured {
  color: var(--bg-deep);
  background: var(--accent);
  border-color: var(--accent);
}

.dk-plan-btn--featured:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.dk-plans-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}


/* ============================================
   Features — Vertical Stack
   ============================================ */
.dk-highlights {
  padding: var(--spacing-2xl) 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.dk-highlights-heading {
  font-size: clamp(1.5rem, 3.5vw, 2.125rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.dk-highlight {
  border-left: 3px solid var(--accent);
  padding: 1.75rem 0 1.75rem 1.75rem;
  margin-bottom: var(--spacing-md);
  transition: border-color 0.2s ease;
}

.dk-highlight:last-child {
  margin-bottom: 0;
}

.dk-highlight:hover {
  border-left-color: var(--accent-hover);
}

.dk-highlight-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.dk-highlight-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 600px;
}


/* ============================================
   FAQ — Native details/summary
   ============================================ */
.dk-faqs {
  padding: var(--spacing-2xl) 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.dk-faqs-heading {
  font-size: clamp(1.5rem, 3.5vw, 2.125rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.dk-faq-entry {
  border-bottom: 1px solid rgba(245, 240, 235, 0.08);
  padding: 0;
  margin: 0;
}

.dk-faq-entry:first-of-type {
  border-top: 1px solid rgba(245, 240, 235, 0.08);
}

.dk-faq-entry summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  font-size: 1.025rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  transition: color 0.2s ease;
  user-select: none;
}

.dk-faq-entry summary::-webkit-details-marker {
  display: none;
}

.dk-faq-entry summary::after {
  content: "+";
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--text-muted);
  border-radius: 50%;
  transition: color 0.2s ease, transform 0.25s ease;
}

.dk-faq-entry[open] summary::after {
  content: "\2212";
  color: var(--accent);
  transform: rotate(180deg);
}

.dk-faq-entry summary:hover {
  color: var(--accent);
}

.dk-faq-entry p {
  padding: 0 0 1.5rem 0;
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 620px;
}


/* ============================================
   Footer — Single Line
   ============================================ */
.dk-bottom {
  padding: var(--spacing-lg) 2rem;
  text-align: center;
  border-top: 1px solid rgba(245, 240, 235, 0.06);
}

.dk-bottom p {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.dk-bottom a {
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.dk-bottom a:hover {
  color: var(--accent);
}


/* ============================================
   Responsive — Single breakpoint at 640px
   ============================================ */
@media (max-width: 640px) {

  /* Nav */
  .dk-topbar {
    padding: 0.75rem 1.25rem;
  }

  .dk-home-link {
    font-size: 0.95rem;
    gap: 0.5rem;
  }

  .dk-mark {
    width: 26px;
    height: 26px;
  }

  .dk-nav-link {
    display: none;
  }

  .dk-topbar-cta {
    padding: 0.4rem 1rem;
    font-size: 0.8rem;
  }

  /* Hero */
  .dk-splash {
    min-height: 75vh;
    padding: var(--spacing-xl) 1.25rem;
  }

  .dk-splash-heading {
    font-size: 1.875rem;
  }

  .dk-splash-sub {
    font-size: 1rem;
  }

  .dk-splash-btn {
    padding: 0.8rem 2rem;
    font-size: 0.975rem;
    width: 100%;
    text-align: center;
  }

  /* Pricing */
  .dk-plans {
    padding: var(--spacing-xl) 1.25rem;
  }

  .dk-plans-heading {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
  }

  .dk-plan-row {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .dk-plan-box {
    padding: 2rem 1.5rem;
  }

  .dk-plan-price {
    font-size: 2rem;
  }

  /* Features */
  .dk-highlights {
    padding: var(--spacing-xl) 1.25rem;
  }

  .dk-highlights-heading {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
  }

  .dk-highlight {
    padding: 1.25rem 0 1.25rem 1.25rem;
  }

  .dk-highlight-title {
    font-size: 1.1rem;
  }

  .dk-highlight-body {
    font-size: 0.9rem;
  }

  /* FAQ */
  .dk-faqs {
    padding: var(--spacing-xl) 1.25rem;
  }

  .dk-faqs-heading {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
  }

  .dk-faq-entry summary {
    font-size: 0.95rem;
    padding: 1rem 0;
  }

  .dk-faq-entry p {
    font-size: 0.875rem;
    padding-bottom: 1.25rem;
  }

  /* Footer */
  .dk-bottom {
    padding: var(--spacing-md) 1.25rem;
  }

  .dk-bottom p {
    font-size: 0.775rem;
  }
}


/* ============================================
   Utility & Accessibility
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

::selection {
  background: var(--accent);
  color: var(--bg-deep);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.dk-get-apps {
  display: flex;
  gap: 10px;
  margin-top: 18px;
  justify-content: center;
  flex-wrap: wrap;
}
.dk-app-link {
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  text-decoration: none;
  padding: 4px 10px;
  border-bottom: 1px solid rgba(255,255,255,0.15);
  transition: color 0.2s;
}
.dk-app-link:hover {
  color: #fff;
  border-bottom-color: #fff;
}

.dk-nav-link {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  margin-left: 1.5rem;
  transition: color 0.2s;
}
.dk-nav-link:hover {
  color: #fff;
}
.dk-lang-link {
  color: rgba(255,255,255,0.5);
  text-decoration: none;
  font-size: 13px;
  margin-left: auto;
  margin-right: 1rem;
}
.dk-lang-link:hover {
  color: #fff;
}

.dk-lang-switcher {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding-top: 12px;
}
.dk-lang-icon { opacity: 0.4; }
.dk-lang-link {
  color: rgba(255,255,255,0.4);
  text-decoration: none;
  font-size: 12px;
  transition: color 0.2s;
}
.dk-lang-link:hover { color: rgba(255,255,255,0.8); }
.dk-lang-sep { color: rgba(255,255,255,0.2); font-size: 12px; }

/* ── Extra feature blocks spacing ── */
.dk-feature-block {
    max-width: 720px;
    margin: 0 auto 32px;
    padding: 32px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.dk-feature-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.dk-feature-desc {
    font-size: 0.938rem;
    line-height: 1.7;
    color: var(--text-secondary);
}
.dk-faq-block {
    max-width: 800px;
    margin: 0 auto 24px;
    padding: 32px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.dk-faq-q {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 8px;
}
.dk-faq-a {
    font-size: 0.938rem;
    line-height: 1.7;
    opacity: 0.8;
}

/* ── Back-link for sub-pages ── */
.dk-back-link {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s ease;
}
.dk-back-link:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* ── Text overflow handling ── */
.dk-faq-entry p,
.dk-faq-a,
.dk-highlight-body,
.dk-splash-sub,
.dk-plans-note {
  overflow-wrap: break-word;
}