/* ============================================================================
   NikSQL — marketing site
   Two themes (dark = Nikkoid Blue, bright = Nikkoid Bright) driven by data-theme.
   ========================================================================== */

:root {
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1140px;
  --font-ui: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --ease: cubic-bezier(.22, .8, .3, 1);
  --nav-h: 64px;
}

html[data-theme="dark"] {
  --bg: #04091c;
  --bg-2: #071331;
  --panel: #0e224e;
  --panel-2: #050c24;
  --card: rgba(14, 34, 78, .72);
  --card-border: rgba(95, 196, 255, .18);
  --text: #eaf4ff;
  --dim: #8fa9cc;
  --accent: #1e9bff;
  --accent-soft: #5fc4ff;
  --accent-hover: #3aacff;
  --on-accent: #ffffff;
  --danger: #ff6b7a;
  --ok: #3ddc97;
  --marked: #ffd166;
  --glow: rgba(30, 155, 255, .5);
  --glow-soft: rgba(95, 196, 255, .22);
  --shadow: 0 24px 70px rgba(0, 0, 0, .5), 0 0 40px rgba(30, 155, 255, .08);
  --shadow-sm: 0 10px 30px rgba(0, 0, 0, .35);
  --hero-grad: radial-gradient(1200px 620px at 50% -10%, rgba(95, 196, 255, .20), transparent 60%), linear-gradient(180deg, #102658 0%, #04091c 100%);
  --code-bg: rgba(4, 9, 28, .6);
}

html[data-theme="light"] {
  --bg: #f6faff;
  --bg-2: #e9f2fe;
  --panel: #ffffff;
  --panel-2: #f3f8ff;
  --card: rgba(255, 255, 255, .85);
  --card-border: rgba(30, 120, 220, .18);
  --text: #081733;
  --dim: #3f5a80;
  --accent: #1e9bff;
  --accent-soft: #1584e6;
  --accent-hover: #3aacff;
  --on-accent: #ffffff;
  --danger: #e0344b;
  --ok: #12a870;
  --marked: #c2410c;
  --glow: rgba(30, 155, 255, .35);
  --glow-soft: rgba(30, 155, 255, .16);
  --shadow: 0 24px 60px rgba(20, 60, 120, .18), 0 0 30px rgba(30, 155, 255, .10);
  --shadow-sm: 0 10px 26px rgba(20, 60, 120, .14);
  --hero-grad: radial-gradient(1200px 620px at 50% -10%, rgba(95, 196, 255, .38), transparent 60%), linear-gradient(180deg, #dcebff 0%, #f6faff 100%);
  --code-bg: rgba(15, 45, 90, .06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 12px); }

body {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background .4s var(--ease), color .4s var(--ease);
}

a { color: var(--accent-soft); text-decoration: none; }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; display: block; }
button { font-family: inherit; }
::selection { background: var(--accent); color: var(--on-accent); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------------------------------------------------------------- header */
.site-head {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--card-border);
}
.nav-inner { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; display: flex; align-items: center; gap: 26px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); letter-spacing: .02em; }
.brand img { width: 30px; height: 30px; border-radius: 8px; box-shadow: 0 0 18px var(--glow-soft); }
.brand span { background: linear-gradient(90deg, var(--accent-soft), var(--accent)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

.nav-links { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.nav-links a {
  color: var(--dim);
  padding: 7px 12px;
  border-radius: 9px;
  font-size: 14.5px;
  font-weight: 500;
  transition: color .18s, background .18s;
}
.nav-links a:hover { color: var(--text); background: var(--card); }

.nav-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.nav-buy {
  background: var(--accent); color: var(--on-accent);
  padding: 9px 18px; border-radius: 10px; font-weight: 600; font-size: 14px;
  box-shadow: 0 0 20px var(--glow-soft);
  transition: transform .18s var(--ease), box-shadow .18s, background .18s;
}
.nav-buy:hover { background: var(--accent-hover); color: #fff; transform: translateY(-1px); box-shadow: 0 0 28px var(--glow); }

.icon-btn {
  width: 40px; height: 40px; display: inline-grid; place-items: center;
  background: var(--card); border: 1px solid var(--card-border); border-radius: 11px;
  cursor: pointer; color: var(--text); font-size: 17px;
  transition: transform .18s var(--ease), border-color .18s, box-shadow .18s;
}
.icon-btn:hover { transform: translateY(-1px); border-color: var(--accent-soft); box-shadow: 0 0 16px var(--glow-soft); }

.lang-wrap { position: relative; }
.lang-btn { padding: 0 12px; width: auto; gap: 8px; font-size: 14px; display: inline-flex; align-items: center; }
.lang-btn .arrow { font-size: 10px; opacity: .7; transition: transform .2s; }
.lang-wrap.open .lang-btn .arrow { transform: rotate(180deg); }

.lang-menu {
  position: absolute; right: 0; top: calc(100% + 8px);
  min-width: 220px; padding: 6px;
  background: var(--panel); border: 1px solid var(--card-border);
  border-radius: 12px; box-shadow: var(--shadow);
  opacity: 0; transform: translateY(-8px) scale(.98); pointer-events: none;
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}
.lang-wrap.open .lang-menu { opacity: 1; transform: none; pointer-events: auto; }
.lang-menu button {
  width: 100%; display: flex; align-items: center; gap: 10px;
  padding: 9px 11px; background: transparent; border: 0; border-radius: 8px;
  color: var(--text); font-size: 14px; cursor: pointer; text-align: left;
}
.lang-menu button:hover, .lang-menu button.active { background: var(--card); }
.lang-menu button.active { color: var(--accent-soft); font-weight: 600; }
.lang-menu .flag { font-size: 18px; }
.lang-menu .check { margin-left: auto; opacity: 0; }
.lang-menu button.active .check { opacity: 1; }

.hamburger { display: none; }

/* ---------------------------------------------------------------- hero */
.hero { position: relative; overflow: hidden; padding: 110px 0 90px; }
.hero::before { content: ""; position: absolute; inset: 0; background: var(--hero-grad); z-index: -2; }
.hero::after {
  content: ""; position: absolute; width: 560px; height: 560px; left: 50%; top: -260px;
  transform: translateX(-50%); border-radius: 50%;
  background: radial-gradient(circle, var(--glow-soft), transparent 70%);
  animation: floaty 9s ease-in-out infinite; z-index: -1;
}
@keyframes floaty { 0%, 100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(26px); } }

.hero-inner { text-align: center; max-width: 820px; margin: 0 auto; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px; border-radius: 999px;
  background: var(--card); border: 1px solid var(--card-border);
  font-size: 13px; color: var(--dim); font-weight: 500;
  margin-bottom: 26px;
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 10px var(--ok); }

.hero h1 {
  margin: 0 0 22px; font-size: clamp(34px, 6vw, 58px); line-height: 1.08;
  font-weight: 800; letter-spacing: -.02em;
  background: linear-gradient(180deg, var(--text), color-mix(in srgb, var(--text) 72%, var(--accent)));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero .sub { font-size: clamp(16px, 2.4vw, 20px); color: var(--dim); max-width: 640px; margin: 0 auto 36px; }

.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 14px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  padding: 15px 28px; border-radius: 13px; font-size: 16px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; text-decoration: none;
  transition: transform .18s var(--ease), box-shadow .18s, background .18s, border-color .18s;
}
.btn:active { transform: translateY(0) scale(.98); }
.btn-primary { background: var(--accent); color: var(--on-accent); box-shadow: 0 0 26px var(--glow-soft); }
.btn-primary:hover { background: var(--accent-hover); color: #fff; transform: translateY(-2px); box-shadow: 0 6px 30px var(--glow); }
.btn-ghost { background: var(--card); color: var(--text); border-color: var(--card-border); }
.btn-ghost:hover { border-color: var(--accent-soft); transform: translateY(-2px); box-shadow: 0 0 20px var(--glow-soft); color: var(--text); }

.hero-note { font-size: 13px; color: var(--dim); }
.hero-shot { margin: 64px auto 0; max-width: 980px; position: relative; }
.hero-shot img { border-radius: var(--radius); border: 1px solid var(--card-border); box-shadow: var(--shadow); width: 100%; }
.hero-shot::after { content: ""; position: absolute; inset: auto 8% -14px; height: 40px; background: var(--accent); filter: blur(46px); opacity: .28; z-index: -1; }

/* reveal-on-scroll */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: .08s; }
.reveal[data-d="2"] { transition-delay: .16s; }
.reveal[data-d="3"] { transition-delay: .24s; }

/* ---------------------------------------------------------------- stats */
.stats { padding: 30px 0 10px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat { text-align: center; padding: 26px 10px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--card-border); }
.stat b { display: block; font-size: 34px; font-weight: 800; color: var(--accent-soft); line-height: 1; }
.stat span { font-size: 13.5px; color: var(--dim); }

/* ---------------------------------------------------------------- sections */
section { padding: 80px 0; }
.sec-head { text-align: center; max-width: 620px; margin: 0 auto 54px; }
.sec-head h2 { margin: 0 0 14px; font-size: clamp(26px, 4vw, 40px); font-weight: 800; letter-spacing: -.01em; }
.sec-head p { margin: 0; color: var(--dim); font-size: 17px; }

/* features */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature {
  padding: 30px 26px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--card-border);
  transition: transform .28s var(--ease), border-color .28s, box-shadow .28s;
}
.feature:hover { transform: translateY(-6px); border-color: var(--accent-soft); box-shadow: var(--shadow); }
.feature .ico {
  width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center;
  margin-bottom: 18px; font-size: 22px;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  box-shadow: 0 6px 20px var(--glow-soft);
}
.feature h3 { margin: 0 0 10px; font-size: 18px; }
.feature p { margin: 0; color: var(--dim); font-size: 14.5px; }

/* screenshots */
.screenshots { background: var(--bg-2); }
.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.shot {
  position: relative; border-radius: var(--radius); overflow: hidden; cursor: zoom-in;
  border: 1px solid var(--card-border); background: var(--panel);
  transition: transform .3s var(--ease), box-shadow .3s;
}
.shot:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.shot img { width: 100%; aspect-ratio: 16/10; object-fit: cover; object-position: top; transition: transform .5s var(--ease); }
.shot:hover img { transform: scale(1.03); }
.shot figcaption { padding: 14px 16px; font-size: 13.5px; color: var(--dim); }

/* lightbox */
.lightbox { position: fixed; inset: 0; z-index: 200; display: grid; place-items: center; padding: 40px; background: rgba(2, 6, 18, .86); backdrop-filter: blur(6px); opacity: 0; pointer-events: none; transition: opacity .25s; }
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox img { max-width: min(1100px, 100%); max-height: 86vh; border-radius: 12px; border: 1px solid var(--card-border); box-shadow: 0 30px 90px rgba(0,0,0,.6); }
.lightbox .lb-cap { color: #cfe0f5; text-align: center; margin-top: 16px; font-size: 14px; }
.lightbox .lb-x { position: absolute; top: 22px; right: 26px; width: 44px; height: 44px; border-radius: 12px; background: rgba(255,255,255,.08); color: #fff; border: 1px solid rgba(255,255,255,.2); font-size: 20px; cursor: pointer; }

/* downloads */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.dl-card { padding: 28px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--card-border); display: flex; flex-direction: column; }
.dl-card .os { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.dl-card .os .glyph { font-size: 30px; }
.dl-card h3 { margin: 0; font-size: 19px; }
.dl-card .links { display: flex; flex-direction: column; gap: 8px; }
.dl-link {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 12px 14px; border-radius: 11px; background: var(--panel);
  border: 1px solid var(--card-border); color: var(--text); font-size: 14.5px; font-weight: 500;
  transition: border-color .18s, transform .18s, box-shadow .18s;
}
.dl-link:hover { border-color: var(--accent-soft); transform: translateX(3px); box-shadow: 0 0 16px var(--glow-soft); color: var(--text); }
.dl-link .ext { font-size: 11.5px; color: var(--dim); font-family: var(--font-mono); }
.dl-sysreq { text-align: center; color: var(--dim); font-size: 13px; margin-top: 30px; }

/* pricing */
.plans { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; max-width: 820px; margin: 0 auto; }
.plan { padding: 34px 30px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--card-border); position: relative; transition: transform .28s var(--ease), border-color .28s, box-shadow .28s; }
.plan:hover { transform: translateY(-5px); border-color: var(--accent-soft); box-shadow: var(--shadow); }
.plan.featured { border-color: var(--accent-soft); box-shadow: 0 0 40px var(--glow-soft); }
.plan .tag { position: absolute; top: -13px; left: 28px; padding: 4px 12px; border-radius: 999px; background: var(--accent); color: #fff; font-size: 12px; font-weight: 600; }
.plan h3 { margin: 0 0 4px; font-size: 20px; }
.plan .price { font-size: 40px; font-weight: 800; letter-spacing: -.02em; margin: 10px 0 2px; }
.plan .price small { font-size: 15px; font-weight: 500; color: var(--dim); }
.plan .note { color: var(--dim); font-size: 14px; margin-bottom: 22px; }
.plan ul { list-style: none; margin: 0 0 26px; padding: 0; display: flex; flex-direction: column; gap: 11px; }
.plan li { display: flex; align-items: center; gap: 10px; font-size: 14.5px; }
.plan li::before { content: "✓"; color: var(--ok); font-weight: 700; }
.price-note { text-align: center; color: var(--dim); font-size: 13px; margin-top: 28px; }

/* FAQ */
.faq { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { border: 1px solid var(--card-border); border-radius: var(--radius); background: var(--card); overflow: hidden; }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 20px 22px; background: transparent; border: 0; color: var(--text);
  font-size: 16.5px; font-weight: 600; text-align: left; cursor: pointer;
}
.faq-q .chev { flex: none; width: 22px; height: 22px; transition: transform .3s var(--ease); color: var(--accent-soft); }
.faq-item.open .chev { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .34s var(--ease); }
.faq-item.open .faq-a { max-height: 220px; }
.faq-a p { margin: 0; padding: 0 22px 20px; color: var(--dim); font-size: 15px; }

/* ---------------------------------------------------------------- footer */
footer { border-top: 1px solid var(--card-border); background: var(--bg-2); padding: 60px 0 40px; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.foot-brand p { color: var(--dim); font-size: 14px; max-width: 320px; }
.foot-brand .brand { margin-bottom: 14px; }
.foot-col h4 { margin: 0 0 14px; font-size: 14px; text-transform: uppercase; letter-spacing: .08em; color: var(--dim); }
.foot-col a { display: block; color: var(--text); font-size: 14.5px; padding: 4px 0; opacity: .85; }
.foot-col a:hover { opacity: 1; color: var(--accent-soft); }
.foot-bottom { margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--card-border); display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--dim); }
.socials { display: flex; gap: 10px; }
.socials a { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 10px; background: var(--card); border: 1px solid var(--card-border); color: var(--text); transition: transform .18s, border-color .18s, box-shadow .18s; }
.socials a:hover { transform: translateY(-2px); border-color: var(--accent-soft); box-shadow: 0 0 16px var(--glow-soft); color: var(--text); }

/* ---------------------------------------------------------------- rtl */
html[dir="rtl"] .nav-links { margin-left: 0; margin-right: 8px; }
html[dir="rtl"] .nav-right { margin-left: 0; margin-right: auto; }
html[dir="rtl"] .dl-link:hover { transform: translateX(-3px); }
html[dir="rtl"] .lang-menu { right: auto; left: 0; }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 940px) {
  .features-grid, .dl-grid { grid-template-columns: 1fr 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .hamburger { display: grid; }
  .nav-links.open {
    display: flex; position: absolute; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px; padding: 12px 20px 20px;
    background: var(--panel); border-bottom: 1px solid var(--card-border); box-shadow: var(--shadow);
  }
}
@media (max-width: 620px) {
  .features-grid, .dl-grid, .gallery, .plans, .stats-grid { grid-template-columns: 1fr; }
  section { padding: 60px 0; }
  .hero { padding: 80px 0 60px; }
  .foot-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}