/* ============================================================
   Brido — Freebuff Design System Port
   ============================================================ */

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

/* ── Variables — Brido server palette (overlay.rs) ─────────── */
:root {
  /* Direct map from Rust Color32 constants */
  --bg:           #121212;   /* BG           rgb(18,18,18)   */
  --surface:      #1e1e1e;   /* SURFACE       rgb(30,30,30)   */
  --surface-hi:   #2a2a2a;   /* SURFACE_HOVER rgb(42,42,42)   */
  --code-bg:      #282828;   /* CODE_BG       rgb(40,40,40)   */
  --border:       #2a2a2a;
  --border-hi:    #3a3a3a;

  --accent:       #00e676;   /* ACCENT        rgb(0,230,118)  */
  --accent-dim:   rgba(0,230,118,0.12);
  --accent-border:rgba(0,230,118,0.22);

  --text-1:       #f0f0f0;   /* TEXT_PRIMARY  rgb(240,240,240)*/
  --text-2:       #a0a0a0;   /* TEXT_SECONDARY rgb(160,160,160)*/
  --text-3:       #646464;   /* TEXT_DIM      rgb(100,100,100)*/

  --red:          #ef5350;   /* RED           rgb(239,83,80)  */
  --yellow:       #ffca28;   /* YELLOW        rgb(255,202,40) */

  --mono:         'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --font-head:    'Manrope', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;

  --radius:       0px;
  --transition:   0.15s ease;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

a { color: inherit; text-decoration: none; }

code {
  font-family: var(--mono);
  font-size: 0.78em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  color: var(--accent);
  padding: 0.1em 0.45em;
  border-radius: 2px;
}

/* ── Layout ────────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 0.5rem;
}

/* ── Header ────────────────────────────────────────────────── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0,0,0,0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 3.5rem;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.logo {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: -0.05em;
  color: var(--text-1);
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-2);
  border: 1px solid var(--border-hi);
  padding: 0.4rem 0.875rem;
  border-radius: 0;
  background: transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.github-link svg { width: 0.9rem; height: 0.9rem; }

.github-link:hover {
  color: var(--text-1);
  border-color: var(--accent);
  background: var(--code-bg);
}

.kofi-header-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--transition), transform var(--transition);
}

.kofi-header-link img {
  height: 1.5rem;
  width: auto;
  display: block;
}

.kofi-header-link:hover {
  opacity: 0.85;
  transform: scale(1.05);
}

.docs-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-2);
  padding: 0.4rem 0.875rem;
  transition: color var(--transition);
}

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

/* ── Hero ──────────────────────────────────────────────────── */
.hero {
  padding: 6rem 0 5.5rem;
  border-bottom: 1px solid var(--border);
}

.badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  border: 1px solid var(--border);
  padding: 0.3rem 0.75rem;
  border-radius: 0;
  margin-bottom: 2rem;
  background: var(--surface);
}

.hero h1 {
  font-family: var(--font-head);
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1.05;
  margin-bottom: 1.5rem;
  color: var(--text-1);
  max-width: 760px;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 580px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.cta-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.cta-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
}

.cta-subtext {
  font-family: var(--font-body);
  font-size: 0.725rem;
  color: var(--text-3);
  font-weight: 500;
  padding-left: 0.2rem;
}

.hero-inner-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-text-side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.hero-slider-side {
  width: 100%;
  display: flex;
  justify-content: center;
}

.slider-wrapper {
  overflow: hidden;
  width: 100%;
  max-width: 290px;
  position: relative;
  aspect-ratio: 380 / 620;
}

.slider-track {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  width: 100%;
  height: 100%;
}

.slide {
  min-width: 100%;
  width: 100%;
  height: 100%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 700;
  padding: 0.75rem 1.625rem;
  border-radius: 0;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.btn svg { width: 1rem; height: 1rem; }
.btn:active { opacity: 0.88; }

.btn-primary {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: #00ff85;
  border-color: #00ff85;
}

.btn-secondary {
  background: var(--surface-hi);
  color: var(--text-1);
  border-color: var(--border-hi);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Shared section ────────────────────────────────────────── */
section { padding: 5rem 0; border-bottom: 1px solid var(--border); }

.section-header {
  margin-bottom: 3rem;
}

.section-label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-header h2 {
  font-family: var(--font-head);
  font-size: clamp(1.625rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  color: var(--text-1);
  margin-bottom: 0.625rem;
}

.section-header p {
  color: var(--text-2);
  font-size: 1rem;
  max-width: 500px;
}

/* ── Use Cases ─────────────────────────────────────────────── */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.use-case-card {
  background: var(--bg);
  padding: 2rem 1.75rem;
  transition: background var(--transition);
}

.use-case-card:hover { background: var(--surface-hi); }

.uc-num {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
  display: block;
}

.use-case-card h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.625rem;
  color: var(--text-1);
}

.use-case-card p {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.7;
}

/* ── Steps ─────────────────────────────────────────────────── */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.step-card {
  background: var(--bg);
  padding: 2.25rem 2rem;
  position: relative;
  transition: background var(--transition);
}

.step-card:hover { background: var(--surface-hi); }

.step-num {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-3);
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
  display: block;
}

.step-card h3 {
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 0.625rem;
  color: var(--text-1);
}

.step-card p {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.7;
}

/* ── Terminal command block ────────────────────────────────── */
.terminal-block {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 3.25rem 1.5rem 1.25rem; /* extra top padding for header */
  margin-top: 2rem;
  font-family: var(--mono);
  font-size: 0.825rem;
  color: var(--accent);
  line-height: 1.8;
  position: relative;
  max-width: 100%;
}

.terminal-block .prompt { color: var(--text-3); user-select: none; }

.terminal-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  background: rgba(0, 0, 0, 0.2);
}

.terminal-title {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  user-select: none;
}

.copy-btn {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  user-select: none;
  transition: color var(--transition);
}

.copy-btn:hover {
  color: var(--text-1);
}

.terminal-body {
  white-space: pre-wrap;
  word-break: break-all;
  width: 100%;
}

/* ── Platform columns ──────────────────────────────────────── */
.platform-cols {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.platform-col { background: var(--bg); }

.platform-col-header {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1.375rem 1.75rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.platform-col-header svg {
  width: 1.25rem;
  height: 1.25rem;
  stroke-width: 2;
  color: var(--accent);
  flex-shrink: 0;
}

.platform-col-header h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-1);
  line-height: 1.2;
}

.stack-tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-3);
  margin-top: 0.1rem;
}

.feature-list {
  list-style: none;
  padding: 1.625rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-list li {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.65;
}

.feature-list li::before {
  content: '→';
  color: var(--accent);
  flex-shrink: 0;
  font-size: 0.8rem;
  margin-top: 0.15rem;
  font-family: var(--mono);
}

.feature-list li strong { color: var(--text-1); font-weight: 600; }

/* ── Footer ────────────────────────────────────────────────── */
footer {
  padding: 2rem 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.825rem;
  color: var(--text-3);
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.footer-sep {
  width: 1px;
  height: 0.875rem;
  background: var(--border);
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.footer-right a {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.825rem;
  transition: color var(--transition);
}

.footer-right a svg { width: 0.8rem; height: 0.8rem; }
.footer-right a:hover { color: var(--text-1); }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 860px) {
  .hero-inner-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-text-side { align-items: center; text-align: center; }
  .hero h1 { text-align: center; margin-left: auto; margin-right: auto; }
  .hero-desc { text-align: center; margin-left: auto; margin-right: auto; }
  .cta-group { justify-content: center; }
  .cta-item { align-items: center; }
  .terminal-block { margin-left: auto; margin-right: auto; }
  .platform-cols { grid-template-columns: 1fr; }
  .use-cases-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .hero { padding: 4rem 0 3.5rem; }
  section { padding: 3.5rem 0; }
  .steps-grid { grid-template-columns: 1fr; }
  .use-cases-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-left { flex-direction: column; gap: 0.375rem; }
  .footer-sep { display: none; }
  .container { padding: 0 1rem; }
}

@media (max-width: 480px) {
  .header-nav { gap: 0.75rem; }
  .github-link, .docs-link { padding: 0.35rem 0.625rem; }
}

/* Floating Home Button */
.floating-home-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3.5rem;
  height: 3.5rem;
  background: transparent;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transition: transform 0.2s ease;
  cursor: pointer;
  padding: 0.25rem;
}

.floating-home-btn:hover {
  transform: translateY(-4px) scale(1.08);
}

.floating-home-btn img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}