:root {
  --bg: #101114;
  --bg-alt: #17181c;
  --panel: #1d1f24;
  --border: #2b2d34;
  --text: #e8e9ec;
  --dim: #9a9ca4;
  --accent: #e30613;
  --accent-hover: #ff2230;
  --ok: #3ecf6e;
  --lane-bg: #14151a;
  --chip-bg: #26282e;
  --chip-border: #3a3d45;
  --clip-top: #2a2d35;
  --clip-bottom: #232630;
  --wave1: #2f3f33;
  --wave2: #34313f;
}

[data-theme="light"] {
  --bg: #f6f6f8;
  --bg-alt: #eeeef1;
  --panel: #ffffff;
  --border: #d7d9df;
  --text: #1a1b1f;
  --dim: #26272c;
  --accent: #e30613;
  --accent-hover: #b8000c;
  --ok: #1e9e4e;
  --lane-bg: #e6e7eb;
  --chip-bg: #ffffff;
  --chip-border: #c7c9d1;
  --clip-top: #d3d5dc;
  --clip-bottom: #c5c8d1;
  --wave1: #79a888;
  --wave2: #948cb4;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
  line-height: 1.6;
}

a { color: var(--accent-hover); text-decoration: none; }
a:hover { text-decoration: underline; }

.mono { font-family: Consolas, "Cascadia Code", monospace; }

/* ==== layout: fixed sidebar + scrolling main ==== */
.layout { display: grid; grid-template-columns: 300px 1fr; min-height: 100vh; }

/* ==== sidebar ==== */
.side {
  border-right: 1px solid var(--border);
  background: var(--bg-alt);
  padding: 34px 28px;
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
}
.side .logo {
  display: flex; align-items: center; gap: 12px;
  font-weight: 700; font-size: 1.05rem; color: var(--text);
}
.side .logo:hover { text-decoration: none; }
.side .logo img { width: 40px; height: 40px; }
.side .tag { color: var(--dim); font-size: 0.82rem; margin: 10px 0 30px; }
.side nav { display: flex; flex-direction: column; }
.side nav a {
  color: var(--dim); padding: 10px 0; border-top: 1px solid var(--border);
  font-size: 0.92rem; display: flex; justify-content: space-between;
}
.side nav a:last-of-type { border-bottom: 1px solid var(--border); }
.side nav a:hover { color: var(--text); text-decoration: none; }
.side nav a .arr { color: var(--accent); }
.side .push { flex: 1; min-height: 26px; }
.side .pricebox {
  border: 1px solid var(--border); border-radius: 8px;
  padding: 16px; background: var(--panel);
}
.side .pricebox .p { font-size: 1.7rem; font-weight: 800; }
.side .pricebox .p s { font-size: 0.95rem; color: var(--dim); font-weight: 400; margin-right: 8px; }
.side .pricebox .d { color: var(--dim); font-size: 0.78rem; margin: 2px 0 12px; }
.side .pricebox a.buy {
  display: block; text-align: center; background: var(--accent); color: #fff;
  padding: 10px; border-radius: 6px; font-weight: 700;
}
.side .pricebox a.buy:hover { background: var(--accent-hover); text-decoration: none; }
.side .foot { color: var(--dim); font-size: 0.72rem; margin-top: 16px; }

/* theme toggle */
.theme-toggle {
  width: 40px; height: 40px; padding: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--dim); background: var(--panel);
  border: 1px solid var(--border); border-radius: 6px;
  cursor: pointer;
}
.theme-toggle:hover { color: var(--text); border-color: var(--dim); }
.theme-toggle svg { width: 20px; height: 20px; display: block; }
.theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }
@media (min-width: 901px) {
  .theme-toggle { position: fixed; top: 16px; right: 16px; z-index: 40; }
}
@media (max-width: 900px) {
  .theme-toggle { margin-left: auto; margin-right: 10px; }
}

/* sidebar internals: top row + collapsible body */
.side-top { display: flex; align-items: center; justify-content: space-between; }
.side-body { display: flex; flex-direction: column; flex: 1; min-height: 0; }
.nav-toggle { display: none; }
.nav-btn { display: none; }

/* ==== mobile: sidebar becomes a sticky top bar with a dropdown menu ==== */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .side {
    position: sticky; top: 0; height: auto; z-index: 30;
    padding: 12px 20px;
    border-right: none; border-bottom: 1px solid var(--border);
  }
  .side .logo img { width: 30px; height: 30px; }
  .side .tag { margin: 12px 0 18px; }

  /* hamburger button */
  .nav-btn {
    display: flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 40px; height: 40px; padding: 0 9px;
    border: 1px solid var(--border); border-radius: 6px;
    background: var(--panel); cursor: pointer;
  }
  .nav-btn span {
    display: block; height: 2px; background: var(--text); border-radius: 1px;
    transition: transform 0.18s ease, opacity 0.18s ease;
  }

  /* menu hidden until toggled */
  .side-body { display: none; }
  .nav-toggle:checked ~ .side-body {
    display: flex;
    padding-top: 4px;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
  }

  /* hamburger -> X when open */
  .nav-toggle:checked ~ .side-top .nav-btn span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle:checked ~ .side-top .nav-btn span:nth-child(2) { opacity: 0; }
  .nav-toggle:checked ~ .side-top .nav-btn span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .side .push { min-height: 18px; }
  .side .foot { margin-top: 12px; }
}

/* ==== main column ==== */
.main { min-width: 0; }
.block { padding: 58px 56px; border-bottom: 1px solid var(--border); }
@media (max-width: 900px) { .block { scroll-margin-top: 70px; } }
@media (max-width: 700px) { .block { padding: 40px 24px; } }

.block.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.4rem); line-height: 1.06;
  margin: 0 0 18px; letter-spacing: -0.015em;
}
.block.hero h1 b { color: var(--accent); }
.block.hero p { color: var(--dim); font-size: 1.08rem; max-width: 560px; margin: 0; }

.label {
  color: var(--accent); font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.16em;
  margin-bottom: 14px; display: block;
}

/* alternating feature blocks */
.feat { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 950px) {
  .feat { grid-template-columns: 1fr; }
  .feat .diagram { order: 2; }
}
.feat h2 { font-size: 1.6rem; margin: 0 0 10px; letter-spacing: -0.01em; }
.feat p { color: var(--dim); margin: 0 0 10px; }

.kbd {
  display: inline-block; background: var(--chip-bg); border: 1px solid var(--chip-border);
  border-bottom-width: 2px; border-radius: 4px; padding: 0 6px;
  font-family: Consolas, monospace; font-size: 0.8rem; color: var(--text);
}

/* mini diagrams */
.diagram { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 22px; }
.lane {
  height: 30px; background: var(--lane-bg); border: 1px solid var(--border);
  border-radius: 5px; margin-bottom: 8px; position: relative;
  overflow: hidden; display: flex; align-items: center;
}
.lane .name {
  font-size: 0.66rem; color: var(--dim); font-family: Consolas, monospace;
  background: var(--lane-bg); border: 1px solid var(--border); border-radius: 3px;
  padding: 1px 7px; margin-left: 5px; white-space: nowrap; z-index: 2;
}
.lane.wave::after {
  content: ""; position: absolute; inset: 4px 4px;
  background: repeating-linear-gradient(90deg, var(--wave1) 0 2px, transparent 2px 5px);
  border-radius: 3px;
}
.lane.wave2::after {
  content: ""; position: absolute; inset: 4px 4px;
  background: repeating-linear-gradient(90deg, var(--wave2) 0 2px, transparent 2px 5px);
  border-radius: 3px;
}
.lane .beep { position: absolute; top: 5px; bottom: 5px; width: 4px; background: var(--accent); border-radius: 2px; }
.lane .clip {
  height: 100%; border-right: 2px solid var(--bg);
  background: linear-gradient(180deg, var(--clip-top), var(--clip-bottom));
  display: flex; align-items: center; overflow: hidden; min-width: 0;
}
.lane .clip:last-child { border-right: none; }
.tsegs .seg { font-size: 0.78rem; color: var(--dim); padding: 7px 10px; border-left: 2px solid var(--border); margin-bottom: 6px; }
.tsegs .seg.hit { border-left-color: var(--accent); color: var(--text); background: var(--chip-bg); border-radius: 0 5px 5px 0; }
.tsegs .t { color: var(--accent-hover); font-family: Consolas, monospace; font-size: 0.7rem; margin-right: 8px; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--border); background: var(--chip-bg); border-radius: 999px;
  padding: 5px 14px; font-size: 0.8rem; font-family: Consolas, monospace; color: var(--text);
}
.chip.red { border-color: var(--accent); color: var(--accent-hover); }

/* stats strip */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); border-bottom: 1px solid var(--border); }
.stat {
  padding: 26px 24px; border-right: 1px solid var(--border);
  display: grid; grid-template-rows: minmax(2.2rem, auto) auto; align-content: start;
  justify-items: center; text-align: center;
}
.stat:last-child { border-right: none; }
.stat .v {
  font-size: 1.9rem; font-weight: 800; letter-spacing: -0.02em;
  line-height: 1.1; align-self: end; margin-bottom: 6px;
}
.stat .v i { color: var(--accent); font-style: normal; }
.stat .k { color: var(--dim); font-size: 0.8rem; }

/* buttons */
.btnrow { display: flex; gap: 14px; margin-top: 22px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 13px 30px; border-radius: 6px; font-weight: 700; border: 1px solid var(--border); color: var(--text); }
.btn:hover { text-decoration: none; border-color: var(--dim); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.block.cta-final h2 { font-size: 2rem; margin: 0 0 10px; }
.block.cta-final p { color: var(--dim); max-width: 520px; }

/* ==== article content (guide / buy pages) ==== */
.block h2.title { font-size: 1.6rem; margin: 0 0 10px; letter-spacing: -0.01em; }
.block p.body, .block li { color: var(--dim); }
.block p.body { max-width: 620px; }
.block ol, .block ul { padding-left: 22px; }
.block li { margin-bottom: 8px; }
.block li b, .block li strong { color: var(--text); }

.callout {
  background: var(--panel); border: 1px solid var(--border);
  border-left: 3px solid var(--accent); border-radius: 8px;
  padding: 14px 18px; margin: 20px 0; font-size: 0.95rem;
  color: var(--dim); max-width: 640px;
}

.step-list { counter-reset: step; list-style: none; padding: 0; max-width: 640px; }
.step-list > li { counter-increment: step; position: relative; padding: 0 0 22px 52px; }
.step-list > li::before {
  content: counter(step);
  position: absolute; left: 0; top: 0;
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.step-list h3 { margin: 4px 0 6px; font-size: 1.05rem; color: var(--text); }
.step-list p { margin: 0 0 6px; color: var(--dim); }

audio { width: 100%; max-width: 380px; display: block; margin: 10px 0; }

/* FAQ */
details {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 8px; padding: 14px 18px; margin-bottom: 10px; max-width: 640px;
}
details summary { cursor: pointer; font-weight: 600; }
details p { color: var(--dim); margin: 10px 0 0; }

/* ==== pricing cards (buy page) ==== */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 22px; max-width: 760px; }
.price-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
  padding: 28px; display: flex; flex-direction: column; position: relative;
}
.price-card.featured { border-color: var(--accent); }
.badge {
  position: absolute; top: -12px; left: 24px;
  background: var(--accent); color: #fff; font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.06em; padding: 3px 12px; border-radius: 999px;
  text-transform: uppercase; white-space: nowrap;
}
.price-card h3 { margin: 4px 0; font-size: 1.1rem; }
.price { font-size: 2.5rem; font-weight: 800; margin: 6px 0 2px; letter-spacing: -0.02em; }
.price s { color: var(--dim); font-size: 1.2rem; font-weight: 400; margin-right: 10px; }
.price-note { color: var(--dim); font-size: 0.85rem; margin: 0 0 18px; }
.price-card ul { list-style: none; padding: 0; margin: 0 0 24px; color: var(--dim); font-size: 0.92rem; }
.price-card ul li { padding: 5px 0 5px 24px; position: relative; margin: 0; }
.price-card ul li::before { content: "\2713"; color: var(--ok); position: absolute; left: 2px; }
.price-card .btn { margin-top: auto; text-align: center; }

.fineprint { color: var(--dim); font-size: 0.85rem; max-width: 640px; margin-top: 26px; }

/* ==== gallery ==== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.gitem {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; overflow: hidden; cursor: pointer;
  text-align: left; padding: 0; font: inherit; color: inherit;
}
.gitem:hover { border-color: var(--dim); }
.gitem img { width: 100%; height: 180px; object-fit: cover; display: block; background: var(--lane-bg); }
.gitem .cap { padding: 10px 14px; font-size: 0.85rem; color: var(--dim); display: block; }
.gitem .cap .num { color: var(--accent); font-family: Consolas, monospace; margin-right: 8px; }
.gallery-empty { color: var(--dim); }

.lightbox {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(8, 8, 10, 0.9);
  display: none; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 24px; cursor: zoom-out;
}
.lightbox.open { display: flex; }
.lightbox img { max-width: 92vw; max-height: 82vh; border-radius: 8px; border: 1px solid var(--border); }
.lightbox .lcap { color: #e8e9ec; margin-top: 14px; font-size: 0.95rem; }
.lightbox .lcap .num { color: var(--accent-hover); font-family: Consolas, monospace; margin-right: 8px; }

/* lightbox with side panel + arrows (guide) */
.lightbox .lwrap {
  display: flex; align-items: center; justify-content: center; gap: 24px;
  max-width: calc(100vw - 150px); cursor: default;
}
.lightbox .lwrap img { max-width: min(68vw, 100%); max-height: 84vh; flex-shrink: 1; }
.lightbox .lside { width: 260px; flex-shrink: 0; text-align: left; }
.lightbox .lside .lcap { margin-top: 0; font-weight: 600; font-size: 1.05rem; }
.lightbox .lside .ldesc { color: #b6b8bf; font-size: 0.9rem; margin-top: 10px; white-space: pre-line; }
.lightbox .lside .lcount { color: #7c7e86; font-size: 0.75rem; margin-top: 16px; font-family: Consolas, monospace; }
.lightbox .lside:has(.lcap:empty) { display: none; }
.lnav-group {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 101;
  display: flex; flex-direction: column; gap: 10px;
}
.lnav-group.left { left: 16px; }
.lnav-group.right { right: 16px; }
.lnav {
  width: 48px; height: 48px; border-radius: 50%;
  background: rgba(29, 31, 36, 0.85); color: #e8e9ec;
  border: 1px solid #3a3d45; font-size: 1.7rem; line-height: 1;
  cursor: pointer; padding: 0 0 4px;
}
.lnav:hover { background: var(--accent); border-color: var(--accent); }
.lnav:disabled { opacity: 0.25; cursor: default; }
.lnav:disabled:hover { background: rgba(29, 31, 36, 0.85); border-color: #3a3d45; }
@media (max-width: 800px) {
  .lightbox .lwrap { flex-direction: column; max-width: 92vw; gap: 12px; }
  .lightbox .lwrap img { max-width: 92vw; max-height: 58vh; }
  .lightbox .lside { width: auto; max-height: 24vh; overflow-y: auto; }
  .lnav-group { top: auto; bottom: 14px; transform: none; flex-direction: row; }
  .lnav-group.left { left: 14px; }
  .lnav-group.right { right: 14px; }
}

/* ==== full guide (howtobeepmarker) ==== */
.gsec { max-width: 760px; }
.gsec summary { font-size: 1.02rem; }
.gnum { color: var(--accent); font-family: Consolas, monospace; font-size: 0.85em; margin-right: 8px; }
.gstep { margin: 20px 0 24px; }
.gstep .gtitle { font-weight: 600; color: var(--text); }
.gstep img {
  display: block; margin-top: 10px; width: 100%; max-width: 640px;
  border: 1px solid var(--border); border-radius: 8px;
  cursor: zoom-in; background: var(--lane-bg);
}
#guideintro p { margin: 4px 0; }
.gopt {
  display: inline-block; background: var(--accent); color: #fff;
  font-size: 0.68rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; border-radius: 999px; padding: 2px 10px;
  margin-right: 10px; vertical-align: middle;
}
.gnote { margin: 20px 0 12px; max-width: 760px; }
.gdesc { color: var(--dim); margin: 8px 0 0; max-width: 640px; }

/* ==== contact modal ==== */
.cmodal {
  position: fixed; inset: 0; z-index: 120;
  background: rgba(8, 8, 10, 0.75);
  display: none; align-items: center; justify-content: center; padding: 20px;
}
.cmodal.open { display: flex; }
.cmodal .cbox {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 26px; max-width: 440px; width: 100%;
}
.cbox h3 { margin: 0 0 8px; font-size: 1.2rem; }
.cbox p { color: var(--dim); font-size: 0.92rem; margin: 0 0 16px; }
.cbox .cemail { display: flex; gap: 8px; align-items: stretch; }
.cbox .cemail code {
  flex: 1; background: var(--lane-bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 9px 12px; font-size: 0.88rem;
  overflow-wrap: anywhere; display: flex; align-items: center;
}
.cbox .btn { padding: 9px 18px; font-size: 0.9rem; }
.cbox .cbtns { display: flex; gap: 10px; margin-top: 18px; justify-content: flex-end; }

/* footer */
footer.pagefoot {
  padding: 24px 56px; color: var(--dim); font-size: 0.82rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}
@media (max-width: 700px) { footer.pagefoot { padding: 24px; } }
footer.pagefoot a { color: var(--dim); }
footer.pagefoot a:hover { color: var(--text); }