/* ── TOKENS ─────────────────────────────────────────── */
:root {
  --bg:        #000000;
  --bg-alt:    #0d0d0d;
  --card:      #1c1c1c;
  --card2:     #282828;
  --border:    #2a2a2a;
  --green:     #00bf63;
  --green-dim: rgba(0,191,99,0.12);
  --orange:    #ea5c0c;
  --blue:      #0091d3;
  --text:      #ffffff;
  --muted:     #888888;
  --grid-line: rgba(0,191,99,0.18);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
code {
  font-family: 'Courier New', monospace;
  font-size: 0.82em;
  background: rgba(255,255,255,0.08);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ── NAV ────────────────────────────────────────────── */
.topnav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 28px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: -0.01em;
}

.byteball-logo  { width: 26px; height: 26px; flex-shrink: 0; }
.bbs-logo-img   { height: 28px !important; width: auto !important; max-width: 120px !important; flex-shrink: 0; display: block; object-fit: contain; }
.bbs-icon-img   { height: 28px !important; width: 28px !important; flex-shrink: 0; display: block; object-fit: contain; }
.wvoc-hero-logo { height: 52px !important; width: auto !important; max-width: 220px !important; margin-bottom: 24px; display: block; object-fit: contain; }

.nav-links { display: flex; gap: 32px; }
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text); }

/* ── HERO ───────────────────────────────────────────── */
.hero {
  position: relative;
  overflow: hidden;
  min-height: 92vh;
  display: flex;
  align-items: center;
}

/* Green grid — exact from app background */
.grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,191,99,0.18) 1.5px, transparent 1.5px),
    linear-gradient(90deg, rgba(0,191,99,0.18) 1.5px, transparent 1.5px);
  background-size: 48px 48px;
  pointer-events: none;
}

.grid-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 60% at 50% 50%, transparent 30%, #000 100%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1140px;
  margin: 0 auto;
  padding: 80px 28px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  width: 100%;
}

.label-full { font-weight: 400; opacity: 0.75; letter-spacing: 0.08em; }

.label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 20px;
  border: 1px solid rgba(0,191,99,0.3);
  padding: 4px 12px;
  border-radius: 100px;
}

h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.0;
  letter-spacing: -0.04em;
  margin-bottom: 20px;
  text-wrap: balance;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 440px;
  margin-bottom: 32px;
}

.hero-tags { display: flex; gap: 10px; flex-wrap: wrap; }

.tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 100px;
  letter-spacing: 0.03em;
}

.tag-green  { background: rgba(0,191,99,0.15);  color: var(--green); border: 1px solid rgba(0,191,99,0.25); }
.tag-blue   { background: rgba(0,145,211,0.15); color: var(--blue);  border: 1px solid rgba(0,145,211,0.25); }

/* ── HERO SCREENS ───────────────────────────────────── */
.mock-terminal {
  position: relative;
  height: 540px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.mock-screen {
  position: absolute;
  border-radius: 22px;
  overflow: hidden;
  box-shadow: 0 40px 100px rgba(0,0,0,0.7), 0 0 0 1px rgba(255,255,255,0.06);
}

.mock-screen img { width: 100%; }

.mock-screen-back {
  width: 200px;
  transform: rotate(-10deg) translate(-130px, 40px);
  opacity: 0.45;
  filter: brightness(0.8);
  z-index: 1;
}

.mock-screen-mid {
  width: 215px;
  transform: rotate(5deg) translate(80px, 50px);
  opacity: 0.6;
  filter: brightness(0.85);
  z-index: 2;
}

.mock-screen-front {
  width: 240px;
  transform: rotate(-2deg) translate(-20px, -20px);
  z-index: 3;
}

/* ── SECTIONS ───────────────────────────────────────── */
.section { padding: 96px 28px; }

.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.container { max-width: 1140px; margin: 0 auto; }

.section-label {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 12px;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  margin-bottom: 16px;
  text-wrap: balance;
}

.section-desc {
  font-size: 1rem;
  color: var(--muted);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 56px;
}

/* ── FEATURE CARDS ──────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  margin-top: 48px;
}

.feature-card {
  background: var(--card2);
  padding: 32px 28px;
}

.feature-num {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--green);
  margin-bottom: 20px;
  font-variant-numeric: tabular-nums;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ── SCREENS STRIP ──────────────────────────────────── */
.screens-strip {
  padding: 60px 28px;
  background: var(--bg);
  border-top: 1px solid var(--border);
  overflow: hidden;
}

.screens-strip-inner {
  max-width: 1140px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.strip-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.strip-screen img {
  width: 200px;
  border-radius: 18px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.strip-screen img:hover {
  transform: translateY(-6px);
  box-shadow: 0 30px 80px rgba(0,0,0,0.7), 0 0 0 1px rgba(0,191,99,0.2);
}

.strip-screen-highlight img {
  width: 230px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6), 0 0 0 2px var(--green);
}

.strip-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.strip-arrow {
  font-size: 1.5rem;
  color: var(--border);
  font-weight: 300;
}

/* ── FLOW STEPS ─────────────────────────────────────── */
.flow-steps {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.flow-steps::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(to bottom, var(--green), rgba(0,191,99,0.1));
}

.flow-item {
  display: flex;
  gap: 28px;
  padding-bottom: 40px;
  align-items: flex-start;
}

.flow-item:last-child { padding-bottom: 0; }

.flow-dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
  margin-top: 4px;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 0 4px rgba(0,191,99,0.15);
}

.flow-content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.flow-content p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.65;
  max-width: 560px;
}

/* ── TECH ───────────────────────────────────────────── */
.tech-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.tech-block {
  background: var(--card2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
}

.tech-title {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.tech-items { display: flex; flex-direction: column; gap: 12px; }

.tech-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  line-height: 1.4;
}

.dot-g, .dot-o {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-g { background: var(--green); box-shadow: 0 0 6px rgba(0,191,99,0.5); }
.dot-o { background: var(--orange); box-shadow: 0 0 6px rgba(234,92,12,0.5); }

/* ── STATUS ─────────────────────────────────────────── */
.status-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 48px;
}

.status-block {
  border-radius: 16px;
  padding: 32px;
  border: 1px solid var(--border);
}

.status-done-block {
  background: rgba(0,191,99,0.05);
  border-color: rgba(0,191,99,0.2);
}

.status-wait-block {
  background: rgba(234,92,12,0.05);
  border-color: rgba(234,92,12,0.2);
}

.status-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot-green  { background: var(--green);  box-shadow: 0 0 8px rgba(0,191,99,0.6); }
.status-dot-orange { background: var(--orange); box-shadow: 0 0 8px rgba(234,92,12,0.6); }

.status-block ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }

.status-block li {
  font-size: 0.875rem;
  color: var(--muted);
  display: flex;
  gap: 10px;
  align-items: flex-start;
  line-height: 1.5;
}

.status-block li::before {
  content: '—';
  color: var(--border);
  flex-shrink: 0;
  margin-top: 1px;
}

/* ── UPDATE ─────────────────────────────────────────── */
.update-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 48px;
  align-items: start;
}

.update-col-title {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.update-col-title-red   { color: #ff4d4d; }
.update-col-title-green { color: var(--green); }

.update-items { display: flex; flex-direction: column; gap: 2px; }

.update-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px;
  border-radius: 12px;
  border: 1px solid transparent;
}

.update-item-problem {
  background: rgba(255,77,77,0.05);
  border-color: rgba(255,77,77,0.15);
}

.update-item-improvement {
  background: rgba(0,191,99,0.05);
  border-color: rgba(0,191,99,0.15);
}

.update-items { gap: 10px; }

.update-icon {
  font-size: 1rem;
  color: #ff4d4d;
  flex-shrink: 0;
  margin-top: 2px;
  width: 20px;
  text-align: center;
}

.update-icon-green { color: var(--green); }

.update-item h3 {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.update-item p {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.6;
}

.update-item em { color: #ff4d4d; font-style: normal; font-weight: 600; }

@media (max-width: 900px) {
  .update-grid { grid-template-columns: 1fr; }
}

/* ── FOOTER ─────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 36px 28px;
  background: var(--bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 0.9rem;
  overflow: hidden;
  max-width: 260px;
}

.footer-right { text-align: right; }

.footer-school {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--muted);
}

.footer-github {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--muted);
  text-decoration: none;
  margin-top: 6px;
  transition: color 0.15s;
}
.footer-github:hover { color: #fff; }

/* ── RESPONSIVE ─────────────────────────────────────── */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 60px 20px;
    min-height: auto;
  }

  .mock-terminal { height: 360px; }
  .mock-screen-back  { width: 150px; transform: rotate(-10deg) translate(-90px, 30px); }
  .mock-screen-mid   { width: 160px; transform: rotate(5deg)  translate(60px, 40px); }
  .mock-screen-front { width: 180px; transform: rotate(-2deg) translate(-15px, -15px); }

  .feature-grid { grid-template-columns: 1fr 1fr; }
  .tech-cols    { grid-template-columns: 1fr; }
  .status-cols  { grid-template-columns: 1fr; }
  .nav-links    { display: none; }
  .footer-right { display: none; }
}

@media (max-width: 600px) {
  .feature-grid { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .section { padding: 64px 20px; }
  .strip-screen img { width: 140px; }
  .strip-screen-highlight img { width: 165px; }
}