/* ══════════════════════════════════════════════════════════════════════
   R Studio — Shared Design System
   Dark immersive · Gradient-rich · Glass-morphism
   Used by: rstudio.live, lbby.rstudio.live, edumanage.rstudio.live
   ══════════════════════════════════════════════════════════════════════ */

/* ── Google Fonts ───────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

/* ── Design Tokens ──────────────────────────────────────────────────── */
:root {
  /* Backgrounds */
  --bg:            #0d1526;
  --bg-card:       rgba(16, 20, 31, 0.82);
  --bg-elevated:   rgba(255, 255, 255, 0.055);
  --bg-surface:    rgba(8, 15, 30, 0.72);
  --bg-glass:      rgba(16, 20, 31, 0.65);

  /* Borders */
  --border:        rgba(255, 255, 255, 0.11);
  --border-hover:  rgba(255, 255, 255, 0.20);
  --border-accent: rgba(143, 76, 255, 0.42);

  /* Text */
  --text:          rgba(255, 255, 255, 0.78);
  --text-bright:   rgba(255, 255, 255, 0.94);
  --text-muted:    rgba(255, 255, 255, 0.55);
  --text-faint:    rgba(255, 255, 255, 0.32);

  /* Accent — purple/blue */
  --accent:        #8f4cff;
  --accent-light:  #a56eff;
  --accent-dark:   #7c38f4;
  --accent-glow:   rgba(143, 76, 255, 0.15);
  --accent-glow-strong: rgba(143, 76, 255, 0.28);

  /* Gradient accents */
  --grad-blue:     #38d4ff;
  --grad-purple:   #8e62ff;
  --grad-pink:     #e56cff;

  /* Semantic */
  --green:         #34d399;
  --green-bg:      rgba(52, 211, 153, 0.12);
  --green-border:  rgba(52, 211, 153, 0.30);
  --yellow:        #ffe85a;
  --yellow-bg:     rgba(255, 220, 40, 0.10);
  --yellow-border: rgba(255, 190, 60, 0.32);
  --red:           #ff6b6b;
  --red-bg:        rgba(255, 107, 107, 0.12);
  --red-border:    rgba(255, 107, 107, 0.30);

  /* Radius */
  --radius:        17px;
  --radius-sm:     10px;
  --radius-xs:     6px;

  /* Layout */
  --max-w:         1200px;
  --nav-h:         65px;

  /* Shadows */
  --shadow-sm:     0 4px 16px rgba(0, 0, 0, 0.25);
  --shadow-md:     0 12px 40px rgba(0, 0, 0, 0.35);
  --shadow-lg:     0 35px 90px rgba(0, 0, 0, 0.45);
  --shadow-accent: 0 0 38px rgba(143, 76, 255, 0.18);
  --shadow-glow:   0 0 45px rgba(62, 168, 255, 0.18);

  /* Timing */
  --ease-out:      cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring:   cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
  -webkit-text-size-adjust: 100%;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
  isolation: isolate;
}

/* Background image + gradient overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -3;
  background-image:
    linear-gradient(
      rgba(8, 12, 24, 0.78),
      rgba(8, 12, 24, 0.92)
    ),
    url("../assets/bg-texture.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

/* Ambient glow overlay */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 50% 5%, rgba(158, 150, 255, 0.18), transparent 25%),
    radial-gradient(circle at 85% 35%, rgba(100, 35, 180, 0.12), transparent 20%),
    radial-gradient(circle at center, transparent 0%, rgba(0, 0, 0, 0.25) 50%, rgba(0, 0, 0, 0.60) 100%);
  pointer-events: none;
}

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

a { color: inherit; }
img { max-width: 100%; height: auto; }

/* ── Scrollbar ──────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.25); }

/* ── Focus ──────────────────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ── Nav ─────────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: rgba(8, 10, 16, 0.88);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.nav.scrolled {
  background: rgba(8, 10, 16, 0.95);
  border-bottom-color: rgba(255, 255, 255, 0.10);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 13px;
  text-decoration: none;
  color: #fff;
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -0.7px;
  transition: opacity 0.2s;
}

.nav-brand:hover { opacity: 0.8; }

.nav-brand img {
  height: 38px;
  width: auto;
  border-radius: 5px;
}

.nav-links {
  display: flex;
  gap: 10px;
  align-items: center;
}

.nav-links a {
  height: 39px;
  padding: 0 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.50);
  text-decoration: none;
  font-size: 13px;
  font-weight: 800;
  position: relative;
  transition: 0.2s ease;
}

.nav-links a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.nav-links a.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.11);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 1px;
  width: 27px;
  height: 2px;
  border-radius: 999px;
  background: var(--accent);
  transform: translateX(-50%);
  box-shadow: 0 0 14px rgba(143, 76, 255, 0.8);
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-xs);
  transition: background 0.2s;
}

.nav-toggle:hover { background: rgba(255, 255, 255, 0.08); }

/* ── Hero ────────────────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 135px 20px 105px;
  position: relative;
  overflow: hidden;
}

/* Hero gradient overlay */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(
      135deg,
      rgba(24, 68, 145, 0.85) 10%,
      rgba(42, 58, 146, 0.88) 45%,
      rgba(98, 35, 158, 0.86) 60%
    ),
    url("../assets/bg-texture.jpg");
  background-size: cover;
  background-position: center;
}

/* Hero ambient glow */
.hero::after {
  content: "";
  position: absolute;
  width: 680px;
  height: 680px;
  left: 50%;
  top: 16%;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(78, 194, 255, 0.20), transparent 62%);
  filter: blur(30px);
  z-index: -1;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 1120px;
  min-width: 0;
}

.hero-logo {
  display: block;
  flex: 0 0 auto;
  width: auto;
  height: 80px;
  margin-bottom: 28px;
  border-radius: 20px;
}

.hero-kicker {
  display: inline-block;
  font-size: clamp(32px, 4vw, 55px);
  line-height: 1;
  font-weight: 900;
  letter-spacing: -2px;
  background: linear-gradient(90deg, var(--grad-blue), var(--grad-purple), var(--grad-pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 6px;
}

.hero h1 {
  font-size: clamp(34px, 4vw, 55px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -1.8px;
  color: #fff;
  margin-bottom: 34px;
  text-shadow: 0 8px 30px rgba(0, 0, 0, 0.22);
}

.hero h1 .gradient {
  background: linear-gradient(90deg, var(--grad-blue), var(--grad-purple), var(--grad-pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero > .hero-content > p,
.hero-description {
  max-width: 760px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.55;
  margin: 0 auto 48px;
}

.hero-buttons {
  display: flex;
  gap: 13px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Version badge */
.hero-version {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.48);
  margin-top: 18px;
  font-weight: 600;
}

/* Studio badge */
.studio-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.62);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 18px;
}

.studio-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
}

/* ── Buttons ─────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 900;
  font-family: inherit;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s var(--ease-out);
  user-select: none;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(180deg, #9d5dff 0%, #7c38f4 100%);
  box-shadow: 0 14px 30px rgba(124, 56, 244, 0.30);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 42px rgba(124, 56, 244, 0.42);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.13);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 13px;
}

/* ── Sections ────────────────────────────────────────────────────────── */
.section {
  padding: 110px 20px;
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-dark {
  background: rgba(8, 15, 30, 0.72);
}

.section-darker {
  background: rgba(8, 15, 30, 0.84);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header .label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(30px, 3.4vw, 48px);
  font-weight: 900;
  letter-spacing: -1.8px;
  margin-bottom: 14px;
  color: #fff;
  line-height: 1.08;
}

.section-header p {
  color: rgba(255, 255, 255, 0.62);
  font-size: 17px;
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.65;
  font-weight: 600;
}

/* ── Cards ───────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s var(--ease-out);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

/* ── Feature Cards ───────────────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature-card {
  min-height: 220px;
  padding: 32px;
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.025)),
    var(--bg-card);
  border: 1px solid var(--border);
  box-shadow:
    0 28px 70px rgba(0, 0, 0, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  transition: all 0.25s var(--ease-out);
}

.feature-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow:
    0 32px 80px rgba(0, 0, 0, 0.30),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(113, 64, 255, 0.22);
  border: 1px solid rgba(142, 86, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 26px;
}

.feature-card h3 {
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.6px;
  margin-bottom: 15px;
  color: #fff;
  line-height: 1.2;
}

.feature-card p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.56);
  line-height: 1.6;
  font-weight: 600;
}

/* ── Dashboard Showcase (split layout) ───────────────────────────────── */
.showcase-split {
  display: grid;
  grid-template-columns: 0.95fr 1.35fr;
  gap: 70px;
  align-items: center;
}

.showcase-heading {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 28px;
}

.showcase-icon {
  width: 70px;
  height: 70px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(126, 171, 255, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 33px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.25);
}

.showcase-heading h2 {
  font-size: clamp(34px, 3.4vw, 48px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -1.8px;
  color: #fff;
}

.showcase-lead {
  color: rgba(255, 255, 255, 0.78);
  font-size: 21px;
  line-height: 1.55;
  font-weight: 600;
  margin-bottom: 30px;
}

.showcase-bullets {
  list-style: none;
  display: grid;
  gap: 20px;
}

.showcase-bullets li {
  color: rgba(255, 255, 255, 0.76);
  font-size: 16px;
  line-height: 1.5;
  font-weight: 600;
  position: relative;
  padding-left: 24px;
}

.showcase-bullets li::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #65a7ff;
  position: absolute;
  left: 0;
  top: 10px;
  box-shadow: 0 0 13px rgba(101, 167, 255, 0.8);
}

.showcase-highlight {
  padding: 4px 8px;
  border-radius: 5px;
  color: var(--yellow);
  background: rgba(255, 220, 40, 0.15);
  font-weight: 900;
}

.showcase-image {
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid rgba(126, 171, 255, 0.28);
  background: rgba(255, 255, 255, 0.05);
  box-shadow:
    0 35px 95px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset;
}

.showcase-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ── Screenshot Gallery ──────────────────────────────────────────────── */
.screenshot-list {
  display: grid;
  gap: 38px;
}

.shot-card {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(126, 171, 255, 0.26);
  box-shadow: 0 35px 90px rgba(0, 0, 0, 0.42);
}

.shot-card img {
  width: 100%;
  display: block;
  opacity: 0.88;
}

.shot-label {
  position: absolute;
  left: 26px;
  bottom: 24px;
  max-width: 540px;
  padding: 19px 22px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.10);
  backdrop-filter: blur(8px);
  text-align: left;
}

.shot-label h3 {
  font-size: 20px;
  font-weight: 900;
  margin-bottom: 8px;
  color: #fff;
}

.shot-label p {
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.45;
}

/* ── Download Cards ──────────────────────────────────────────────────── */
.download-panel {
  width: min(1020px, 92vw);
  margin: 0 auto;
  padding: 70px 42px 60px;
  border-radius: 22px;
  text-align: center;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.025)),
    rgba(15, 16, 22, 0.90);
  border: 1px solid rgba(255, 255, 255, 0.105);
  box-shadow:
    0 45px 110px rgba(0, 0, 0, 0.34),
    inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

.download-panel h2 {
  font-size: clamp(42px, 4.4vw, 61px);
  line-height: 1;
  font-weight: 900;
  letter-spacing: -3px;
  color: #fff;
  margin-bottom: 28px;
}

.download-panel .subtitle {
  color: rgba(255, 255, 255, 0.55);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 45px;
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  text-align: center;
}

.download-card {
  min-height: 220px;
  padding: 36px 30px;
  border-radius: var(--radius);
  background: rgba(10, 11, 16, 0.56);
  border: 1px solid rgba(255, 255, 255, 0.09);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.025);
  transition: all 0.2s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.download-card.recommended {
  border-color: var(--accent);
  box-shadow:
    0 0 0 1px rgba(143, 76, 255, 0.42),
    0 0 38px rgba(143, 76, 255, 0.18);
}

.download-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.30),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.download-card .platform-icon {
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 42px;
  margin-bottom: 28px;
}

.download-card h3 {
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.6px;
  margin-bottom: 14px;
  color: #fff;
}

.download-card .version {
  color: rgba(255, 255, 255, 0.48);
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-weight: 700;
  margin-bottom: 23px;
}

.download-card .btn { width: 100%; justify-content: center; }

/* ── Docs ────────────────────────────────────────────────────────────── */
.docs-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

.docs-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 32px);
  align-self: start;
}

.docs-sidebar a {
  display: block;
  padding: 8px 16px;
  color: rgba(255, 255, 255, 0.45);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-xs);
  border-left: 2px solid transparent;
  transition: all 0.2s;
  margin-bottom: 2px;
}

.docs-sidebar a:hover {
  color: rgba(255, 255, 255, 0.82);
  background: rgba(255, 255, 255, 0.04);
}

.docs-sidebar a.active {
  color: #fff;
  border-left-color: var(--accent);
  background: rgba(143, 76, 255, 0.12);
}

.docs-content {
  max-width: 760px;
  min-width: 0;
}

.docs-content h3 {
  font-size: 20px;
  font-weight: 800;
  margin: 40px 0 16px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  letter-spacing: -0.3px;
  color: #fff;
}

.docs-content h3:first-child {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.docs-content p {
  color: rgba(255, 255, 255, 0.62);
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 16px;
  font-weight: 500;
}

.docs-content strong { color: rgba(255, 255, 255, 0.92); font-weight: 700; }

.docs-content ol,
.docs-content ul {
  color: rgba(255, 255, 255, 0.62);
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 20px;
  padding-left: 24px;
  font-weight: 500;
}

.docs-content li { margin-bottom: 6px; }
.docs-content li::marker { color: rgba(255, 255, 255, 0.25); }

.docs-content code {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.10);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: rgba(255, 255, 255, 0.82);
}

.docs-content pre {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 18px;
  overflow-x: auto;
  margin-bottom: 20px;
  position: relative;
}

.docs-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: rgba(255, 255, 255, 0.65);
}

/* Copy button for code blocks */
.docs-content pre .copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.55);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.docs-content pre .copy-btn:hover {
  border-color: rgba(255, 255, 255, 0.20);
  color: #fff;
}

/* ── Changelog ───────────────────────────────────────────────────────── */
.changelog-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.changelog-item:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.changelog-item h3 {
  font-size: 15px;
  font-weight: 800;
  margin-bottom: 4px;
  color: #fff;
}

.changelog-item .date {
  color: rgba(255, 255, 255, 0.42);
  font-size: 12px;
  margin-bottom: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-weight: 700;
}

.changelog-item .body {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.7;
  white-space: pre-wrap;
  font-weight: 500;
}

.changelog-item .body code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* ── Footer ──────────────────────────────────────────────────────────── */
.footer {
  text-align: center;
  padding: 55px 20px;
  color: rgba(255, 255, 255, 0.32);
  font-size: 13px;
  font-weight: 600;
  max-width: var(--max-w);
  margin: 0 auto;
}

.footer-line {
  width: min(1220px, 92vw);
  height: 1px;
  margin: 0 auto 54px;
  background: rgba(255, 255, 255, 0.09);
}

/* ── Language Toggle ─────────────────────────────────────────────────── */
.lang-toggle {
  width: 39px;
  height: 39px;
  margin-left: 5px;
  border-radius: 9px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  font-family: inherit;
}

.lang-toggle:hover {
  background: rgba(255, 255, 255, 0.12);
}

/* ── Beta Warning ────────────────────────────────────────────────────── */
.beta-warning {
  margin-top: 28px;
  padding: 17px 20px;
  border-radius: 10px;
  color: rgba(255, 255, 255, 0.58);
  background: rgba(255, 190, 60, 0.08);
  border: 1px solid var(--yellow-border);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
}

/* ── Back to Top ─────────────────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 120;
  width: 45px;
  height: 45px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 18px;
  font-weight: 900;
  backdrop-filter: blur(10px);
  transition: all 0.2s;
  opacity: 0;
  pointer-events: none;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: rgba(255, 255, 255, 0.28);
}

/* ── Utilities ───────────────────────────────────────────────────────── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.text-muted { color: rgba(255, 255, 255, 0.45); }

/* ── Scroll Animations ───────────────────────────────────────────────── */
.anim-fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

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

/* Stagger delays for grid children */
.anim-stagger > *:nth-child(1) { transition-delay: 0ms; }
.anim-stagger > *:nth-child(2) { transition-delay: 60ms; }
.anim-stagger > *:nth-child(3) { transition-delay: 120ms; }
.anim-stagger > *:nth-child(4) { transition-delay: 180ms; }
.anim-stagger > *:nth-child(5) { transition-delay: 240ms; }
.anim-stagger > *:nth-child(6) { transition-delay: 300ms; }
.anim-stagger > *:nth-child(7) { transition-delay: 360ms; }
.anim-stagger > *:nth-child(8) { transition-delay: 420ms; }
.anim-stagger > *:nth-child(9) { transition-delay: 480ms; }

/* ── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .download-cards { grid-template-columns: repeat(2, 1fr); }
  .docs-layout { grid-template-columns: 1fr; }
  .docs-sidebar {
    position: static;
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    margin-bottom: 32px;
  }
  .docs-sidebar a {
    white-space: nowrap;
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 10px 14px;
    font-size: 12px;
  }
  .docs-sidebar a.active {
    border-left: none;
    border-bottom-color: var(--accent);
  }
  .showcase-split {
    grid-template-columns: 1fr;
    gap: 42px;
  }
}

@media (max-width: 768px) {
  .nav { padding: 0 16px; }
  .nav-toggle { display: block; }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(8, 10, 16, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 8px;
    display: none;
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
  }

  .nav-links.open { display: flex; }

  .nav-links a {
    padding: 12px 16px;
    width: 100%;
    font-size: 14px;
    border-radius: var(--radius-sm);
  }

  .section { padding: 78px 20px; }
  .section-header { margin-bottom: 40px; }

  .hero { padding: 115px 20px 80px; }
  .hero h1 { letter-spacing: -1.5px; }
  .hero > .hero-content > p,
  .hero-description { font-size: 16px; margin-bottom: 42px; }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-buttons .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .features-grid { grid-template-columns: 1fr; gap: 12px; }
  .download-cards { grid-template-columns: 1fr; gap: 12px; }

  .shot-label {
    left: 14px;
    right: 14px;
    bottom: 14px;
    padding: 15px;
  }

  .shot-label h3 { font-size: 17px; }
  .shot-label p { font-size: 13px; }

  .download-panel { padding: 48px 20px; }

  .showcase-heading {
    align-items: flex-start;
  }

  .showcase-icon {
    width: 58px;
    height: 58px;
    font-size: 28px;
  }

  .showcase-lead { font-size: 17px; }
}

@media (max-width: 480px) {
  .nav-brand span { display: none; }
  .nav-brand img { height: 34px; }
  .hero-logo { height: 64px; }
  .hero h1 { font-size: 34px; letter-spacing: -1px; overflow-wrap: anywhere; }
  .hero-kicker { font-size: 32px; }
  .feature-card { padding: 24px; min-height: auto; }
  .download-panel h2 { font-size: 39px; }
}

/* ── Reduced Motion ──────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .anim-fade-up { opacity: 1; transform: none; }
}