/* ============================================================
   JobSentinel — style.css
   Dark theme, GitHub-inspired palette, mobile-first
   ============================================================ */

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

:root {
  --bg:        #0d1117;
  --surface:   #161b22;
  --surface2:  #1c2128;
  --border:    #30363d;
  --accent:    #58a6ff;
  --accent-dim:#1f6feb;
  --green:     #3fb950;
  --yellow:    #d29922;
  --red:       #f85149;
  --orange:    #db6d28;
  --text:      #e6edf3;
  --muted:     #8b949e;
  --radius:    12px;
  --radius-sm: 8px;
  --font:      -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans",
               Helvetica, Arial, sans-serif;
  --mono:      "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --shadow:    0 1px 3px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.3);
  --glow:      0 0 0 1px rgba(88,166,255,.15);
}

html { scroll-behavior: smooth; font-size: 16px; }

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

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

/* ---------- Utility ---------- */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.badge-accent { background: rgba(88,166,255,.12); color: var(--accent); border: 1px solid rgba(88,166,255,.25); }
.badge-green  { background: rgba(63,185,80,.12);  color: var(--green);  border: 1px solid rgba(63,185,80,.25); }
.badge-red    { background: rgba(248,81,73,.12);   color: var(--red);    border: 1px solid rgba(248,81,73,.25); }
.badge-yellow { background: rgba(210,153,34,.12);  color: var(--yellow); border: 1px solid rgba(210,153,34,.25); }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- Nav ---------- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13,17,23,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}
.nav-logo-icon {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--accent-dim), var(--accent));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}
.nav-links a {
  color: var(--muted);
  font-size: .9rem;
  font-weight: 500;
  transition: color .2s;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

.nav-cta {
  padding: 7px 18px;
  background: var(--accent);
  color: #000 !important;
  border-radius: 6px;
  font-weight: 600;
  font-size: .85rem;
  transition: opacity .2s, transform .15s;
}
.nav-cta:hover { opacity: .9; transform: translateY(-1px); text-decoration: none !important; }

.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  font-size: 1.4rem;
  padding: 4px;
}

/* ---------- Hero ---------- */
#hero {
  position: relative;
  overflow: hidden;
  padding: 100px 0 80px;
  text-align: center;
}

.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(88,166,255,.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 50%, rgba(31,111,235,.08), transparent);
}

.hero-eyebrow {
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.02em;
  margin-bottom: 20px;
  background: linear-gradient(160deg, #fff 40%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--muted);
  max-width: 580px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  border: none;
  transition: transform .15s, opacity .2s, box-shadow .2s;
  text-decoration: none;
}
.btn:hover { transform: translateY(-2px); text-decoration: none; }

.btn-primary {
  background: var(--accent);
  color: #000;
  box-shadow: 0 0 0 0 rgba(88,166,255,.4);
}
.btn-primary:hover { box-shadow: 0 4px 20px rgba(88,166,255,.35); opacity: .95; }

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--surface2); }

.btn-sm {
  padding: 8px 16px;
  font-size: .85rem;
}

.hero-code {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 28px;
  font-family: var(--mono);
  font-size: .9rem;
  color: var(--muted);
  text-align: left;
  box-shadow: var(--shadow);
}
.hero-code .prompt { color: var(--green); }
.hero-code .cmd    { color: var(--text); }
.hero-code .out    { color: var(--accent); }

/* ---------- Section headers ---------- */
.section-header {
  text-align: center;
  margin-bottom: 52px;
}
.section-header h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -.02em;
  margin-bottom: 12px;
}
.section-header p {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 520px;
  margin: 0 auto;
}

section { padding: 80px 0; }
section:nth-child(even) { background: var(--surface); }

/* ---------- How It Works ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  position: relative;
}

.step-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
  position: relative;
  transition: transform .2s, box-shadow .2s;
}
.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow), var(--glow);
}

.step-num {
  position: absolute;
  top: -14px; left: 50%;
  transform: translateX(-50%);
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #000;
  font-weight: 700;
  font-size: .8rem;
  display: flex; align-items: center; justify-content: center;
}

.step-icon {
  font-size: 2.4rem;
  margin: 8px 0 16px;
  display: block;
}

.step-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.step-card p { font-size: .9rem; color: var(--muted); }

/* ---------- Features Grid ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform .2s, box-shadow .2s, border-color .2s;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  opacity: 0;
  transition: opacity .3s;
}
.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: rgba(88,166,255,.3);
}
.feature-card:hover::before { opacity: 1; }

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 14px;
  display: block;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.feature-card p {
  font-size: .875rem;
  color: var(--muted);
  line-height: 1.55;
}

/* ---------- Live Demo ---------- */
.demo-wrapper {
  max-width: 760px;
  margin: 0 auto;
}

.demo-input-area {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.demo-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.demo-toolbar-dots { display: flex; gap: 6px; }
.demo-toolbar-dots span {
  width: 12px; height: 12px; border-radius: 50%;
}
.dot-red   { background: #ff5f56; }
.dot-yellow{ background: #febc2e; }
.dot-green { background: #28c840; }

.demo-toolbar-label {
  font-size: .8rem;
  color: var(--muted);
  font-family: var(--mono);
}

textarea#jobInput {
  width: 100%;
  height: 180px;
  background: var(--surface2);
  border: none;
  resize: vertical;
  padding: 18px;
  color: var(--text);
  font-family: var(--mono);
  font-size: .85rem;
  line-height: 1.6;
  outline: none;
}
textarea#jobInput::placeholder { color: var(--muted); }

.demo-actions {
  display: flex;
  gap: 10px;
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface);
  flex-wrap: wrap;
}

/* Results */
#demoResult {
  margin-top: 24px;
  display: none;
}

.score-header {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
}

.score-circle {
  flex-shrink: 0;
  width: 90px; height: 90px;
  border-radius: 50%;
  border: 4px solid;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}
.score-circle .score-num { font-size: 1.8rem; line-height: 1; }
.score-circle .score-label { font-size: .6rem; letter-spacing: .06em; text-transform: uppercase; margin-top: 2px; }

.score-green  { border-color: var(--green);  color: var(--green); }
.score-yellow { border-color: var(--yellow); color: var(--yellow); }
.score-orange { border-color: var(--orange); color: var(--orange); }
.score-red    { border-color: var(--red);    color: var(--red); }

.score-meta h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.score-meta p  { font-size: .875rem; color: var(--muted); }

.signals-list { display: flex; flex-direction: column; gap: 10px; }

.signal-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
}

.signal-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
}
.sig-red    { background: var(--red); }
.sig-orange { background: var(--orange); }
.sig-yellow { background: var(--yellow); }
.sig-green  { background: var(--green); }
.sig-blue   { background: var(--accent); }

.signal-name  { font-size: .875rem; font-weight: 600; flex: 1; }
.signal-desc  { font-size: .8rem; color: var(--muted); flex: 2; }
.signal-weight{
  font-size: .75rem; font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--mono);
  flex-shrink: 0;
}

/* ---------- Signal Categories (Accordion) ---------- */
.accordion { display: flex; flex-direction: column; gap: 12px; max-width: 820px; margin: 0 auto; }

.accordion-item {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  user-select: none;
  transition: background .2s;
  background: none;
  border: none;
  width: 100%;
  color: var(--text);
  font-family: var(--font);
  text-align: left;
}
.accordion-header:hover { background: rgba(255,255,255,.03); }

.accordion-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: .95rem;
}

.accordion-icon { font-size: 1.2rem; }
.accordion-count {
  font-size: .75rem; font-weight: 600;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 10px;
  color: var(--muted);
}

.accordion-chevron {
  color: var(--muted);
  transition: transform .3s;
  font-size: 1rem;
}
.accordion-item.open .accordion-chevron { transform: rotate(180deg); }

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s cubic-bezier(.4,0,.2,1);
}
.accordion-item.open .accordion-body { max-height: 600px; }

.accordion-content {
  padding: 0 22px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
}

.signal-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: .8rem;
  color: var(--muted);
}
.signal-tag .dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }

/* ---------- Statistics ---------- */
#statistics { background: var(--bg); }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.stat-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
}

.stat-num {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}
.stat-label { font-size: .875rem; color: var(--muted); font-weight: 500; }

/* ---------- Installation ---------- */
.install-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
  max-width: 900px;
  margin: 0 auto;
}

.code-block {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.code-block-title {
  font-size: .8rem;
  color: var(--muted);
  font-family: var(--mono);
}

.copy-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 4px;
  padding: 3px 10px;
  font-size: .75rem;
  cursor: pointer;
  transition: background .2s, color .2s;
  font-family: var(--font);
}
.copy-btn:hover { background: var(--border); color: var(--text); }

.code-block pre {
  padding: 18px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: .82rem;
  line-height: 1.65;
}

.code-block .kw  { color: var(--accent); }
.code-block .str { color: var(--green); }
.code-block .cmt { color: var(--muted); font-style: italic; }
.code-block .arg { color: var(--yellow); }
.code-block .ok  { color: var(--green); }
.code-block .err { color: var(--red); }
.code-block .pmt { color: var(--green); }

/* ---------- Open Source ---------- */
.oss-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  max-width: 860px;
  margin: 0 auto 40px;
}

.oss-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: transform .2s, box-shadow .2s;
}
.oss-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.oss-card .oss-icon { font-size: 2rem; margin-bottom: 12px; display: block; }
.oss-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.oss-card p  { font-size: .85rem; color: var(--muted); margin-bottom: 16px; }

.github-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 24px;
  font-weight: 600;
  color: var(--text);
  max-width: 400px;
  margin: 0 auto;
  transition: background .2s, transform .15s;
}
.github-link:hover { background: var(--surface2); transform: translateY(-2px); text-decoration: none; }
.github-link .gh-icon { font-size: 1.3rem; }

/* ---------- Footer ---------- */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 48px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; }
.footer-brand p  { font-size: .85rem; color: var(--muted); max-width: 240px; line-height: 1.55; }

.footer-col h4 { font-size: .8rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 14px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-col a  { font-size: .875rem; color: var(--muted); transition: color .2s; }
.footer-col a:hover { color: var(--text); text-decoration: none; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: .82rem; color: var(--muted); }

.footer-badges { display: flex; gap: 8px; flex-wrap: wrap; }
.footer-badges .badge { font-size: .7rem; }

/* ---------- Animations ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .6s ease both; }
.fade-up.delay-1 { animation-delay: .1s; }
.fade-up.delay-2 { animation-delay: .2s; }
.fade-up.delay-3 { animation-delay: .3s; }

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .55s ease, transform .55s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 60px; left: 0; right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 16px;
    z-index: 99;
  }
  .nav-mobile-toggle { display: block; }

  #hero { padding: 64px 0 56px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > .footer-brand { grid-column: 1 / -1; }

  .score-header { flex-direction: column; text-align: center; }
  .accordion-content { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: center; }
  .install-grid { grid-template-columns: 1fr; }
}