/* ============================================================
   AutoSRE -- Project Showcase
   Design: Dark terminal aesthetic, single green accent
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* -- Tokens ------------------------------------------------- */
:root {
  /* Surfaces */
  --bg:         #0d1117;   /* GitHub dark base */
  --bg-surface: #161b22;   /* GitHub dark surface */
  --bg-raised:  #1c2128;
  --bg-invert:  #f0f6fc;

  /* Text */
  --text:       #e6edf3;
  --text-2:     #8b949e;
  --text-3:     #484f58;
  --text-invert:#0d1117;

  /* Single accent -- green */
  --accent:     #3fb950;   /* GitHub green */
  --accent-dim: rgba(63,185,80,0.1);
  --accent-mid: rgba(63,185,80,0.22);
  --accent-glow:rgba(63,185,80,0.18);

  /* Borders */
  --border:     rgba(240,246,252,0.07);
  --border-mid: rgba(240,246,252,0.12);
  --border-str: rgba(240,246,252,0.18);

  /* Terminal */
  --t-bg:    #010409;
  --t-green: #3fb950;
  --t-yellow:#e3b341;
  --t-blue:  #58a6ff;
  --t-muted: #484f58;

  /* Radii */
  --r-sm: 5px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 22px;

  /* Type */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', ui-monospace, monospace;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.6);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.7);
}

/* -- Reset -------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: opacity .15s; }
a:hover { opacity: .75; }

/* -- Layout ------------------------------------------------- */
.container { max-width: 1080px; margin: 0 auto; padding: 0 28px; }
section { padding: 96px 0; }

/* -- Nav ---------------------------------------------------- */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  background: rgba(13,17,23,0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  transition: background .3s;
}
nav.scrolled { background: rgba(13,17,23,0.96); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-size: 1.05rem; font-weight: 800; letter-spacing: -0.4px; color: var(--text); }
.nav-logo span { color: var(--accent); }

.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a {
  color: var(--text-2); font-size: .875rem; font-weight: 500;
  transition: color .2s; position: relative; padding-bottom: 2px;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; right: 0;
  height: 1.5px; background: var(--accent);
  transform: scaleX(0); transform-origin: left; transition: transform .25s;
}
.nav-links a.active, .nav-links a:hover { color: var(--text); opacity: 1; }
.nav-links a.active::after, .nav-links a:hover::after { transform: scaleX(1); }

.nav-cta {
  background: var(--accent); color: #000 !important;
  padding: 7px 18px; border-radius: 980px;
  font-weight: 700; font-size: .84rem;
  transition: background .2s, transform .15s !important;
}
.nav-cta:hover { background: #46c957; transform: translateY(-1px); opacity: 1 !important; }

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.hamburger span {
  display: block; width: 20px; height: 1.5px;
  background: var(--text-2); border-radius: 2px; transition: all .3s;
}
.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.mobile-menu {
  display: none; position: fixed;
  top: 57px; left: 0; right: 0;
  background: rgba(13,17,23,0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 20px 28px;
  z-index: 190; flex-direction: column; gap: 16px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  color: var(--text-2); font-size: .95rem; font-weight: 500;
  padding: 8px 0; border-bottom: 1px solid var(--border);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { color: var(--accent); opacity: 1; }

/* -- Hero --------------------------------------------------- */
#hero {
  min-height: 100vh; display: flex; align-items: center;
  padding-top: 80px; position: relative; overflow: hidden;
}

.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 0%, transparent 65%);
  pointer-events: none;
}

.hero-layout {
  position: relative; display: grid;
  grid-template-columns: 1fr 1fr; gap: 64px; align-items: center;
}

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent-dim); border: 1px solid var(--accent-mid);
  border-radius: 980px; padding: 5px 14px;
  font-size: .75rem; font-weight: 600; color: var(--accent);
  letter-spacing: .3px; text-transform: uppercase; margin-bottom: 22px;
}
.hero-badge .badge-icon { color: var(--accent); flex-shrink: 0; }

.hero-title {
  font-size: clamp(2.6rem, 5.5vw, 4.4rem);
  font-weight: 900; letter-spacing: -2.5px;
  color: var(--text); margin-bottom: 20px; line-height: 1.06;
}
.hero-title .accent-word { color: var(--accent); }

.hero-subtitle {
  font-size: 1.05rem; color: var(--text-2);
  max-width: 460px; margin-bottom: 36px; line-height: 1.75;
}

.hero-cta-group { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 44px; }

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: #000; font-weight: 700;
  font-size: .9rem; padding: 12px 24px; border-radius: 980px;
  transition: background .2s, transform .15s, box-shadow .2s;
}
.btn-primary:hover {
  background: #46c957; transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow); opacity: 1; color: #000;
}

.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent; color: var(--text); font-weight: 600;
  font-size: .9rem; padding: 12px 24px; border-radius: 980px;
  border: 1px solid var(--border-str);
  transition: border-color .2s, background .2s;
}
.btn-secondary:hover {
  border-color: var(--accent-mid); background: var(--accent-dim);
  color: var(--text); opacity: 1;
}

.badge-strip { display: flex; gap: 8px; flex-wrap: wrap; }
.badge {
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: 980px; padding: 4px 12px;
  font-size: .78rem; font-weight: 500; color: var(--text-2);
}

/* -- Terminal widget ---------------------------------------- */
.terminal-widget {
  background: var(--t-bg);
  border-radius: var(--r-xl); overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-mid);
}
.terminal-titlebar {
  display: flex; align-items: center;
  padding: 12px 16px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
}
.terminal-dots { display: flex; gap: 7px; margin-right: 14px; }
.terminal-dots span { width: 12px; height: 12px; border-radius: 50%; display: block; }
.terminal-dots span:nth-child(1) { background: #ff5f57; }
.terminal-dots span:nth-child(2) { background: #febc2e; }
.terminal-dots span:nth-child(3) { background: #28c840; }
.terminal-title {
  font-size: .74rem; font-weight: 500; color: var(--t-muted);
  font-family: var(--font-mono); flex: 1; text-align: center;
}

.terminal-body {
  padding: 20px 22px;
  height: 340px;
  overflow-y: auto; overflow-x: hidden;
  font-family: var(--font-mono); font-size: .8rem; line-height: 1.75;
  scrollbar-width: none; -ms-overflow-style: none;
}
.terminal-body::-webkit-scrollbar { display: none; }

.t-line   { display: block; white-space: pre-wrap; }
.t-prompt { color: var(--t-green); }
.t-cmd    { color: var(--text); }
.t-info   { color: var(--t-muted); }
.t-ok     { color: var(--t-green); }
.t-warn   { color: var(--t-yellow); }
.t-accent { color: var(--t-blue); }

.cursor {
  display: inline-block; width: 7px; height: 13px;
  background: var(--t-green); border-radius: 1px;
  animation: blink .9s step-end infinite; vertical-align: -2px;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* -- Stats -------------------------------------------------- */
#stats {
  padding: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat-item {
  padding: 40px 32px; text-align: center;
  border-right: 1px solid var(--border);
}
.stat-item:last-child { border-right: none; }
.stat-num {
  font-size: 2.6rem; font-weight: 800; letter-spacing: -1.5px;
  color: var(--accent); margin-bottom: 4px; display: block;
}
.stat-label {
  font-size: .78rem; color: var(--text-3); font-weight: 500;
  text-transform: uppercase; letter-spacing: .6px;
}

/* -- Section labels ----------------------------------------- */
.section-label {
  display: inline-block; font-size: .72rem; font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px;
}
.section-title {
  font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 800;
  letter-spacing: -1.2px; color: var(--text); margin-bottom: 14px;
}
.section-desc {
  color: var(--text-2); font-size: 1rem; max-width: 520px; line-height: 1.75;
}
.section-header { margin-bottom: 60px; }

/* -- How It Works ------------------------------------------- */
#how-it-works {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.flow-track { display: flex; align-items: flex-start; }
.flow-connector {
  flex: 1; display: flex; align-items: center;
  padding-top: 28px; margin: 0 -8px;
}
.flow-connector-line { flex: 1; height: 1px; background: var(--border-mid); }
.flow-connector-arrow { color: var(--text-3); font-size: .9rem; margin-left: 2px; }

.flow-step {
  flex: 0 0 auto; width: 148px;
  display: flex; flex-direction: column;
  align-items: center; text-align: center; z-index: 1;
}
.flow-icon {
  width: 56px; height: 56px; border-radius: var(--r-md);
  background: var(--bg);
  border: 1px solid var(--border-mid);
  display: flex; align-items: center; justify-content: center;
  color: var(--accent); margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.flow-step:hover .flow-icon {
  transform: translateY(-3px);
  box-shadow: 0 4px 20px var(--accent-glow);
  border-color: var(--accent-mid);
}
.flow-step h3 { font-size: .9rem; font-weight: 700; margin-bottom: 5px; color: var(--text); }
.flow-step p  { font-size: .78rem; color: var(--text-2); line-height: 1.5; }

/* -- Features ----------------------------------------------- */
#features { background: var(--bg); }
.features-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.feature-card {
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 30px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.feature-card:hover {
  transform: translateY(-3px); border-color: var(--accent-mid);
  box-shadow: 0 4px 24px var(--accent-glow);
}
.feature-icon {
  width: 44px; height: 44px; border-radius: var(--r-md);
  background: var(--accent-dim); border: 1px solid var(--accent-mid);
  display: flex; align-items: center; justify-content: center;
  color: var(--accent); margin-bottom: 18px;
}
.feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.feature-card p  { font-size: .875rem; color: var(--text-2); line-height: 1.65; }

/* -- Scenarios ---------------------------------------------- */
#scenarios {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.scenario-card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 26px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.scenario-card:hover {
  transform: translateY(-4px); border-color: var(--accent-mid);
  box-shadow: 0 4px 24px var(--accent-glow);
}
.scenario-tag {
  display: inline-block; background: var(--accent-dim);
  border: 1px solid var(--accent-mid); border-radius: var(--r-sm);
  padding: 3px 10px; font-size: .74rem; font-weight: 600;
  color: var(--accent); font-family: var(--font-mono); margin-bottom: 14px;
}
.scenario-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 14px; color: var(--text); }
.scenario-detail  { display: flex; flex-direction: column; gap: 9px; }
.detail-row       { display: flex; gap: 10px; }
.detail-label {
  font-size: .7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .4px; color: var(--text-3);
  min-width: 78px; padding-top: 2px; flex-shrink: 0;
}
.detail-value { font-size: .84rem; color: var(--text-2); }
.detail-code {
  font-family: var(--font-mono); font-size: .78rem; color: var(--accent);
  background: var(--accent-dim); padding: 2px 7px;
  border-radius: 4px; border: 1px solid var(--accent-mid);
}

/* -- Quickstart --------------------------------------------- */
#quickstart { background: var(--bg); }
.quickstart-steps { display: flex; flex-direction: column; gap: 36px; }
.qs-step { display: grid; grid-template-columns: 48px 1fr; gap: 20px; align-items: start; }
.step-num {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--accent-dim); border: 1px solid var(--accent-mid);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: .95rem; color: var(--accent); flex-shrink: 0;
}
.step-body h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.step-body p  { color: var(--text-2); font-size: .875rem; margin-bottom: 12px; line-height: 1.65; }

/* -- Code blocks -------------------------------------------- */
.code-block {
  border-radius: var(--r-md); overflow: hidden;
  border: 1px solid var(--border-mid); background: var(--t-bg);
  box-shadow: var(--shadow-md);
}
.code-header {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
}
.code-dots { display: flex; gap: 6px; }
.code-dots span { width: 11px; height: 11px; border-radius: 50%; display: block; }
.code-dots span:nth-child(1) { background: #ff5f57; }
.code-dots span:nth-child(2) { background: #febc2e; }
.code-dots span:nth-child(3) { background: #28c840; }
.code-lang {
  font-size: .7rem; font-weight: 600; color: var(--t-muted);
  font-family: var(--font-mono); text-transform: uppercase;
  letter-spacing: .5px; flex: 1; text-align: center;
}
.copy-btn {
  display: flex; align-items: center; gap: 5px;
  background: rgba(255,255,255,0.05); border: 1px solid var(--border);
  border-radius: 5px; padding: 4px 10px;
  font-size: .72rem; font-weight: 600; color: var(--text-2);
  cursor: pointer; transition: all .2s; font-family: var(--font-sans);
}
.copy-btn:hover { background: var(--accent-dim); border-color: var(--accent-mid); color: var(--accent); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent-mid); }
.code-block pre { margin: 0; padding: 18px 20px; overflow-x: auto; }
.code-block code { font-family: var(--font-mono); font-size: .84rem; line-height: 1.75; }

/* -- LLM Backends ------------------------------------------- */
#backends {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.backends-table-wrap {
  border-radius: var(--r-lg); border: 1px solid var(--border);
  overflow: hidden; background: var(--bg);
}
table { width: 100%; border-collapse: collapse; }
thead { background: var(--bg-surface); border-bottom: 1px solid var(--border); }
th {
  padding: 12px 20px; text-align: left; font-size: .72rem;
  font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--text-3);
}
td { padding: 15px 20px; font-size: .875rem; border-bottom: 1px solid var(--border); color: var(--text-2); }
tr:last-child td { border-bottom: none; }
tbody tr { transition: background .15s; }
tbody tr:hover { background: var(--bg-surface); }
.backend-name { font-weight: 600; color: var(--text); }

.cost-badge {
  display: inline-block; padding: 2px 10px; border-radius: 980px;
  font-size: .72rem; font-weight: 700;
}
.cost-free  { background: var(--accent-dim); color: var(--accent); border: 1px solid var(--accent-mid); }
.cost-paid  { background: rgba(255,255,255,0.05); color: var(--text-2); border: 1px solid var(--border-mid); }
.cost-local { background: rgba(88,166,255,0.1); color: #58a6ff; border: 1px solid rgba(88,166,255,0.22); }

code.inline {
  font-family: var(--font-mono); font-size: .8rem;
  background: var(--accent-dim); color: var(--accent);
  padding: 2px 7px; border-radius: 4px; border: 1px solid var(--accent-mid);
}

/* -- Real Infra --------------------------------------------- */
#real-infra { background: var(--bg); }
.infra-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.infra-card {
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 26px;
  transition: border-color .25s, transform .25s, box-shadow .25s;
}
.infra-card:hover {
  border-color: var(--accent-mid); transform: translateY(-3px);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.infra-icon {
  width: 44px; height: 44px; border-radius: var(--r-md);
  background: var(--accent-dim); border: 1px solid var(--accent-mid);
  display: flex; align-items: center; justify-content: center;
  color: var(--accent); margin-bottom: 16px;
}
.infra-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.infra-card p  { font-size: .85rem; color: var(--text-2); line-height: 1.6; }
.infra-env { margin-top: 14px; }
.infra-env code.inline { display: block; font-size: .77rem; word-break: break-all; }

/* -- Footer ------------------------------------------------- */
footer {
  border-top: 1px solid var(--border); padding: 44px 0;
  background: var(--bg-surface);
}
.footer-inner {
  display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center; gap: 20px;
}
.footer-logo { font-size: .95rem; font-weight: 800; color: var(--text); }
.footer-logo span { color: var(--accent); }
.footer-meta { font-size: .8rem; color: var(--text-3); text-align: center; }
.footer-links { display: flex; gap: 20px; justify-content: flex-end; }
.footer-links a { font-size: .84rem; color: var(--text-2); transition: color .2s; }
.footer-links a:hover { color: var(--accent); opacity: 1; }

/* -- Scroll animations -------------------------------------- */
.reveal {
  opacity: 0; transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: .07s; }
.reveal-delay-2 { transition-delay: .14s; }
.reveal-delay-3 { transition-delay: .21s; }
.reveal-delay-4 { transition-delay: .28s; }

/* -- Responsive --------------------------------------------- */
@media (max-width: 900px) {
  .hero-layout { grid-template-columns: 1fr; }
  .terminal-widget { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .scenario-grid { grid-template-columns: 1fr; }
  .infra-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(2) { border-right: none; }
  .stat-item:nth-child(3) { border-top: 1px solid var(--border); }
  .stat-item:nth-child(4) { border-top: 1px solid var(--border); border-right: none; }
}
@media (max-width: 768px) {
  section { padding: 72px 0; }
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .flow-track { flex-direction: column; align-items: stretch; gap: 0; }
  .flow-step {
    width: 100%; flex-direction: row; text-align: left;
    gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--border);
  }
  .flow-step:last-child { border-bottom: none; }
  .flow-icon { flex-shrink: 0; margin-bottom: 0; }
  .flow-connector { display: none; }
  .qs-step { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; justify-items: start; }
  .footer-links { justify-content: flex-start; }
  .footer-meta { text-align: left; }
}
@media (max-width: 480px) {
  .hero-cta-group { flex-direction: column; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
}