/* ─────────────────────────────────────────────────────────
   DARK PAGES — spreadsheets, f9miner, ecdsa
   Standalone dark stylesheet. Does not inherit light theme.
───────────────────────────────────────────────────────── */

:root {
  --d-bg:        #0a0a0a;
  --d-bg2:       #111111;
  --d-bg3:       #181818;
  --d-border:    rgba(255,255,255,0.08);
  --d-border2:   rgba(255,255,255,0.14);
  --d-white:     #f0ede8;
  --d-silver:    #a09a92;
  --d-smoke:     #5a5550;
  --d-orange:    #f7931a;
  --d-orange-dim:rgba(247,147,26,0.15);
  --d-orange-glow:rgba(247,147,26,0.25);
  --d-red:       #b91c1c;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--d-bg);
  color: var(--d-white);
  font-family: 'DM Sans', sans-serif;
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ─── NAVBAR ──────────────────────────────────────────── */
.dark-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 72px;
  background: rgba(10,10,10,0.6);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--d-border);
}
.dark-nav .nav-container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}
.dark-logo {
  text-decoration: none;
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
}
.dark-logo .logo-percent {
  font-family: 'Leewadee UI', 'Leewadee', 'DM Sans', sans-serif;
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--d-orange);
  letter-spacing: -0.03em;
  line-height: 1;
  transition: text-shadow 0.5s ease;
  display: inline-block;
}
.dark-logo:hover .logo-percent {
  text-shadow: 0 0 14px var(--d-orange-glow);
}
.dark-logo .logo-word {
  font-family: 'Leewadee UI', 'Leewadee', 'Cormorant Garamond', Georgia, serif;
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--d-smoke);
  letter-spacing: 0.08em;
  line-height: 1;
  transition: color 0.3s ease;
}
.dark-logo:hover .logo-word { color: var(--d-white); }
.dark-nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.dark-nav-links a {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(160,154,146,0.5);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.25s ease;
}
.dark-nav-links a:hover,
.dark-nav-links a.dark-active { color: var(--d-white); }
.dark-nav-buy {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--d-orange);
  text-decoration: none;
  border: 1px solid rgba(247,147,26,0.4);
  padding: 8px 18px;
  transition: all 0.25s ease;
}
.dark-nav-buy:hover {
  background: var(--d-orange-dim);
  border-color: var(--d-orange);
}
.dark-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.dark-mobile-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--d-silver);
  transition: all 0.3s ease;
}

/* ─── SHARED DARK LAYOUT ──────────────────────────────── */
.dark-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 40px;
}
.dark-section {
  padding: 100px 0;
}
.dark-section + .dark-section {
  border-top: 1px solid var(--d-border);
}

/* ─── DARK HERO ───────────────────────────────────────── */
.dark-hero {
  padding: 160px 0 100px;
  background: linear-gradient(180deg, #0d0d0d 0%, var(--d-bg) 100%);
  border-bottom: 1px solid var(--d-border);
}
.dark-eyebrow {
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--d-orange);
  font-weight: 600;
  margin-bottom: 20px;
}
.dark-hero-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 300;
  color: var(--d-white);
  line-height: 1.0;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}
.dark-hero-title em { font-style: italic; color: var(--d-orange); }
.dark-hero-sub {
  font-size: 0.9rem;
  color: var(--d-silver);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 400;
  margin-bottom: 12px;
}
.dark-hero-desc {
  font-size: 1rem;
  color: var(--d-silver);
  max-width: 560px;
  line-height: 1.8;
  font-weight: 300;
}

/* ─── SPREADSHEETS PAGE ───────────────────────────────── */
.sheet-grid {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sheet-item {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 24px 28px;
  border: 1px solid var(--d-border);
  background: var(--d-bg2);
  transition: border-color 0.25s ease, background 0.25s ease;
}
.sheet-item:hover {
  border-color: var(--d-border2);
  background: var(--d-bg3);
}
.sheet-item.featured {
  border-left: 3px solid var(--d-orange);
}
.sheet-name {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--d-white);
  margin-bottom: 4px;
  line-height: 1.1;
}
.sheet-name a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}
.sheet-name a:hover { color: var(--d-orange); }
.sheet-desc {
  font-size: 0.82rem;
  color: var(--d-silver);
  letter-spacing: 0.04em;
  line-height: 1.6;
}
.sheet-desc em { color: var(--d-smoke); font-style: normal; }
.sheet-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  flex-shrink: 0;
}
.sheet-tag {
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 4px 10px;
  border: 1px solid var(--d-border2);
  color: var(--d-smoke);
}
.sheet-tag.free { color: var(--d-orange); border-color: rgba(247,147,26,0.3); }
.sheet-tag.inquire { color: #60a5fa; border-color: rgba(96,165,250,0.3); cursor: pointer; text-decoration: none; display: inline-block; transition: all 0.2s ease; }
.sheet-tag.inquire:hover { background: rgba(96,165,250,0.1); }
.dark-btn {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 8px 16px;
  text-decoration: none;
  transition: all 0.25s ease;
  white-space: nowrap;
}
.dark-btn-outline {
  border: 1px solid var(--d-border2);
  color: var(--d-silver);
}
.dark-btn-outline:hover {
  border-color: var(--d-orange);
  color: var(--d-orange);
}
.dark-btn-orange {
  background: var(--d-orange-dim);
  border: 1px solid rgba(247,147,26,0.4);
  color: var(--d-orange);
}
.dark-btn-orange:hover {
  background: rgba(247,147,26,0.25);
  border-color: var(--d-orange);
}

/* ─── SECTION HEADERS ─────────────────────────────────── */
.dark-section-label {
  font-size: 0.62rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--d-orange);
  font-weight: 600;
  margin-bottom: 28px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--d-border);
}

/* ─── DONATIONS ───────────────────────────────────────── */
.donation-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.donation-card {
  border: 1px solid var(--d-border);
  background: var(--d-bg2);
  padding: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}
.donation-label {
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--d-silver);
  font-weight: 500;
  text-align: center;
}
.donation-qr-img {
  display: block;
  width: 200px;
  height: 200px;
  border: 1px solid var(--d-border2);
}

/* CTA section */
.dark-cta-section { text-align: center; padding: 100px 0; }
.dark-cta-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2.6rem, 5vw, 4.4rem);
  font-weight: 300;
  color: var(--d-white);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 16px 0 20px;
}
.dark-cta-title em { font-style: italic; color: var(--d-orange); }
.dark-cta-sub {
  font-size: 0.88rem;
  color: var(--d-silver);
  margin-bottom: 40px;
  font-weight: 300;
  letter-spacing: 0.04em;
}
.dark-cta-btn { font-size: 0.76rem; padding: 14px 32px; }

/* ─── ARTICLE PAGES (F9MINER, ECDSA) ─────────────────── */
.dark-article {
  max-width: 720px;
}
.dark-article p {
  font-size: 0.95rem;
  color: var(--d-silver);
  line-height: 1.9;
  margin-bottom: 22px;
  font-weight: 300;
}
.dark-article p strong { color: var(--d-white); font-weight: 500; }
.dark-article p a,
.dark-article ul li a { color: var(--d-orange); text-decoration: none; border-bottom: 1px solid rgba(247,147,26,0.3); transition: border-color 0.2s ease; }
.dark-article p a:hover,
.dark-article ul li a:hover { border-color: var(--d-orange); }
.dark-article ul {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.dark-article ul li {
  font-size: 0.95rem;
  color: var(--d-silver);
  padding-left: 22px;
  position: relative;
  line-height: 1.75;
}
.dark-article ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--d-orange);
}

/* Update callout box */
.dark-callout {
  border: 1px solid rgba(247,147,26,0.25);
  border-left: 3px solid var(--d-orange);
  background: rgba(247,147,26,0.05);
  padding: 24px 28px;
  margin: 36px 0;
}
.dark-callout-label {
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--d-orange);
  font-weight: 600;
  margin-bottom: 12px;
}
.dark-callout p {
  font-size: 0.9rem;
  color: var(--d-silver);
  line-height: 1.8;
  margin-bottom: 12px;
}
.dark-callout p:last-child { margin-bottom: 0; }

/* Hash display */
.hash-block {
  background: #0d0d0d;
  border: 1px solid var(--d-border2);
  padding: 18px 22px;
  margin: 12px 0 20px;
}
.hash-label {
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--d-smoke);
  margin-bottom: 8px;
}
.hash-value {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.82rem;
  color: var(--d-orange);
  word-break: break-all;
  line-height: 1.5;
}
.hash-hint {
  font-size: 0.72rem;
  color: var(--d-smoke);
  margin-top: 6px;
  font-style: italic;
}

/* Download button row */
.download-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 28px 0;
}

/* ─── FOOTER ──────────────────────────────────────────── */
.dark-footer {
  border-top: 1px solid var(--d-border);
  padding: 60px 0 40px;
  background: var(--d-bg);
}
.dark-footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  margin-bottom: 40px;
}
.dark-footer-brand .logo-percent {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.4rem;
  color: var(--d-smoke);
}
.dark-footer-brand .logo-word {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--d-smoke);
}
.dark-footer-links {
  display: flex;
  gap: 60px;
}
.dark-footer-col h4 {
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--d-smoke);
  font-weight: 600;
  margin-bottom: 16px;
}
.dark-footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.dark-footer-col a {
  font-size: 0.82rem;
  color: rgba(160,154,146,0.5);
  text-decoration: none;
  transition: color 0.2s ease;
}
.dark-footer-col a:hover { color: var(--d-white); }
.dark-footer-bottom {
  border-top: 1px solid var(--d-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 0.74rem;
  color: var(--d-smoke);
}

/* ─── RESPONSIVE ──────────────────────────────────────── */
@media (max-width: 768px) {
  .dark-mobile-toggle { display: flex; }
  .dark-nav-links {
    display: none;
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: rgba(10,10,10,0.98);
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
    border-bottom: 1px solid var(--d-border);
  }
  .dark-nav-links.active { display: flex; }
  .dark-nav-links li { padding: 12px 32px; border-bottom: 1px solid var(--d-border); }
  .dark-nav-buy { display: none; }
  .dark-container { padding: 0 24px; }
  .sheet-item { grid-template-columns: 1fr; gap: 16px; }
  .sheet-actions { align-items: flex-start; flex-direction: row; flex-wrap: wrap; }
  .donation-wrap { grid-template-columns: 1fr; }
  .dark-footer-inner { flex-direction: column; }
  .dark-footer-links { flex-direction: column; gap: 32px; }
  .dark-footer-bottom { flex-direction: column; gap: 8px; }
  .download-row { flex-direction: column; }
}