/* =====================================================
   TechStack Comparisons — styles.css
   ===================================================== */

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

:root {
  --clr-bg:        #0f1117;
  --clr-surface:   #1a1d27;
  --clr-card:      #222636;
  --clr-border:    #2e3350;
  --clr-accent:    #6c63ff;
  --clr-accent2:   #00d4aa;
  --clr-accent3:   #ff6b6b;
  --clr-accent4:   #ffd166;
  --clr-text:      #e2e8f0;
  --clr-muted:     #8892a4;
  --clr-go:        #00add8;
  --clr-python:    #ffd43b;
  --clr-rust:      #ce422b;
  --clr-java:      #f89820;
  --radius:        12px;
  --shadow:        0 4px 24px rgba(0,0,0,.4);
  --transition:    .25s ease;
  --font-sans:     'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', monospace;
}

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

body {
  background: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--font-sans);
  line-height: 1.7;
  min-height: 100vh;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--clr-bg); }
::-webkit-scrollbar-thumb { background: var(--clr-border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--clr-accent); }

/* ---- Typography ---- */
h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.25; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }
p  { color: var(--clr-muted); margin-top: .5rem; }
a  { color: var(--clr-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { padding-left: 1.25rem; }
li { margin: .25rem 0; color: var(--clr-muted); }
code, kbd {
  font-family: var(--font-mono);
  font-size: .85em;
  background: rgba(108,99,255,.15);
  padding: .1em .4em;
  border-radius: 4px;
  color: var(--clr-accent2);
}

/* ---- Header ---- */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15,17,23,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
  padding: 0 1.5rem;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--clr-text);
  white-space: nowrap;
  min-width: 0;
  overflow: hidden;
  flex-shrink: 1;
}
.logo .logo-icon { font-size: 1.5rem; flex-shrink: 0; }
.logo span:not(.logo-icon) { background: linear-gradient(90deg, var(--clr-accent), var(--clr-accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; overflow: hidden; text-overflow: ellipsis; }

/* ---- Main Nav ---- */
#main-nav {
  display: flex;
  gap: .25rem;
  flex-wrap: wrap;
}

.nav-btn {
  background: transparent;
  border: none;
  color: var(--clr-muted);
  font-family: var(--font-sans);
  font-size: .875rem;
  font-weight: 500;
  padding: .45rem .85rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.nav-btn:hover { background: var(--clr-surface); color: var(--clr-text); }
.nav-btn.active { background: var(--clr-accent); color: #fff; }

/* Mobile nav toggle */
#nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--clr-border);
  color: var(--clr-text);
  border-radius: 8px;
  padding: .4rem .7rem;
  cursor: pointer;
  font-size: 1.2rem;
  flex-shrink: 0;
  min-width: 44px;
  min-height: 44px;
}

/* Mobile nav overlay */
#nav-overlay {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,.45);
  z-index: 1001;
}

/* ---- Hero ---- */
#hero {
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(108,99,255,.25) 0%, transparent 70%),
              var(--clr-bg);
  padding: 5rem 1.5rem 4rem;
  text-align: center;
}
.hero-inner { max-width: 760px; margin: 0 auto; }
#hero h1 { margin-bottom: 1rem; }
#hero .hero-sub {
  font-size: 1.125rem;
  color: var(--clr-muted);
  max-width: 560px;
  margin: 0 auto 2rem;
}

.badge-row { display: flex; flex-wrap: wrap; gap: .5rem; justify-content: center; margin-top: 1.5rem; }
.badge {
  font-size: .75rem;
  font-weight: 600;
  padding: .3rem .75rem;
  border-radius: 999px;
  border: 1px solid currentColor;
  opacity: .85;
}
.badge-go     { color: var(--clr-go); }
.badge-python { color: var(--clr-python); }
.badge-rust   { color: var(--clr-rust); }
.badge-java   { color: var(--clr-java); }
.badge-js     { color: var(--clr-accent4); }
.badge-ui     { color: var(--clr-accent2); }
.badge-sec    { color: var(--clr-accent3); }

/* ---- Sections ---- */
.section {
  display: none;
  padding: 3rem 1.5rem 5rem;
  max-width: 1280px;
  margin: 0 auto;
  animation: fadeIn .3s ease;
}
.section.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.section-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--clr-border);
}
.section-header .section-label {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: .4rem;
}
.section-header p { font-size: 1.05rem; }

/* ---- Cards ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.card-grid-3 {
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
}

.card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.card:hover {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 1px var(--clr-accent), var(--shadow);
  transform: translateY(-2px);
}
.card-icon { font-size: 2rem; margin-bottom: .75rem; }
.card h3 { margin-bottom: .5rem; color: var(--clr-text); }
.card h4 { color: var(--clr-muted); font-weight: 600; margin: 1rem 0 .4rem; font-size: .875rem; text-transform: uppercase; letter-spacing: .05em; }

/* Colored card tops */
.card.go-card    { border-top: 3px solid var(--clr-go); }
.card.python-card { border-top: 3px solid var(--clr-python); }
.card.rust-card  { border-top: 3px solid var(--clr-rust); }
.card.java-card  { border-top: 3px solid var(--clr-java); }
.card.js-card    { border-top: 3px solid var(--clr-accent4); }
.card.ui-card    { border-top: 3px solid var(--clr-accent2); }
.card.sec-card   { border-top: 3px solid var(--clr-accent3); }
.card.accent-card { border-top: 3px solid var(--clr-accent); }

/* ---- Comparison Table ---- */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--clr-border);
  margin: 1.5rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}
thead tr { background: var(--clr-surface); }
thead th {
  padding: .9rem 1rem;
  text-align: left;
  font-weight: 700;
  color: var(--clr-text);
  border-bottom: 1px solid var(--clr-border);
  white-space: nowrap;
}
tbody tr { border-bottom: 1px solid rgba(46,51,80,.6); transition: background var(--transition); }
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: rgba(108,99,255,.07); }
tbody td {
  padding: .75rem 1rem;
  color: var(--clr-muted);
  vertical-align: top;
}
tbody td:first-child { color: var(--clr-text); font-weight: 600; }

/* Rating dots */
.rating { display: flex; gap: 3px; align-items: center; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--clr-border); }
.dot.filled { background: var(--clr-accent); }
.dot.filled.good  { background: var(--clr-accent2); }
.dot.filled.warn  { background: var(--clr-accent4); }
.dot.filled.danger { background: var(--clr-accent3); }

/* ---- Pill tags ---- */
.tag-row { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .5rem; }
.tag {
  font-size: .72rem;
  font-weight: 600;
  padding: .25rem .6rem;
  border-radius: 999px;
  background: rgba(108,99,255,.18);
  color: var(--clr-accent);
}
.tag.green  { background: rgba(0,212,170,.15); color: var(--clr-accent2); }
.tag.yellow { background: rgba(255,209,102,.15); color: var(--clr-accent4); }
.tag.red    { background: rgba(255,107,107,.15); color: var(--clr-accent3); }
.tag.blue   { background: rgba(0,173,216,.15); color: var(--clr-go); }

/* ---- Recommendation Highlight ---- */
.recommend-box {
  background: linear-gradient(135deg, rgba(108,99,255,.15), rgba(0,212,170,.1));
  border: 1px solid rgba(108,99,255,.35);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}
.recommend-box h4 { color: var(--clr-accent2); margin-bottom: .5rem; font-size: 1rem; }

/* ---- Security score bar ---- */
.score-bar-wrap { margin: .4rem 0 .8rem; }
.score-label { font-size: .8rem; color: var(--clr-muted); display: flex; justify-content: space-between; margin-bottom: .2rem; }
.score-bar { height: 8px; width: 100%; border-radius: 999px; background: var(--clr-border); overflow: hidden; }
.score-fill { height: 100%; border-radius: 999px; transition: width .8s ease; }
.score-fill.high   { background: linear-gradient(90deg, var(--clr-accent2), #00b894); }
.score-fill.medium { background: linear-gradient(90deg, var(--clr-accent4), #f39c12); }
.score-fill.low    { background: linear-gradient(90deg, var(--clr-accent3), #c0392b); }

/* ---- Timeline / Flow ---- */
.flow {
  display: flex;
  flex-direction: column;
  gap: 1px;
  position: relative;
}
.flow::before {
  content: '';
  position: absolute;
  left: 1.1rem;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--clr-border);
}
.flow-item {
  display: flex;
  gap: 1rem;
  padding: .75rem 0;
  position: relative;
  z-index: 1;
}
.flow-dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--clr-accent);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .7rem;
  font-weight: 700;
  color: #fff;
}
.flow-content { flex: 1; padding-top: .1rem; }
.flow-content strong { color: var(--clr-text); }

/* ---- Tabs within section ---- */
.inner-tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.5rem; }
.inner-tab {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  color: var(--clr-muted);
  font-family: var(--font-sans);
  font-size: .85rem;
  font-weight: 600;
  padding: .5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition);
}
.inner-tab:hover { border-color: var(--clr-accent); color: var(--clr-text); }
.inner-tab.active { background: var(--clr-accent); border-color: var(--clr-accent); color: #fff; }

.inner-panel { display: none; animation: fadeIn .3s ease; }
.inner-panel.active { display: block; }

/* ---- Feature matrix ---- */
.matrix {
  display: grid;
  gap: .75rem;
  margin: 1rem 0;
}
.matrix-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  align-items: center;
  gap: 1rem;
  padding: .5rem .75rem;
  background: var(--clr-surface);
  border-radius: 8px;
  border: 1px solid var(--clr-border);
}
.matrix-label { font-size: .875rem; font-weight: 600; color: var(--clr-text); }
.matrix-bars { display: flex; gap: .5rem; flex-wrap: wrap; }

/* ---- Callout ---- */
.callout {
  display: flex;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  margin: 1rem 0;
  border-left: 4px solid;
}
.callout-info  { background: rgba(108,99,255,.1); border-color: var(--clr-accent); }
.callout-warn  { background: rgba(255,209,102,.08); border-color: var(--clr-accent4); }
.callout-good  { background: rgba(0,212,170,.08); border-color: var(--clr-accent2); }
.callout-bad   { background: rgba(255,107,107,.08); border-color: var(--clr-accent3); }
.callout-icon  { font-size: 1.4rem; line-height: 1; flex-shrink: 0; }
.callout-body  { flex: 1; }
.callout-body strong { color: var(--clr-text); display: block; margin-bottom: .25rem; }
.callout-body p { margin: 0; font-size: .9rem; }

/* ---- Footer ---- */
footer {
  border-top: 1px solid var(--clr-border);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--clr-muted);
  font-size: .875rem;
}
footer a { color: var(--clr-accent2); }

/* ---- Back-to-top ---- */
#back-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 44px; height: 44px;
  background: var(--clr-accent);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition);
  z-index: 999;
}
#back-top.visible { opacity: 1; transform: translateY(0); }
#back-top:hover   { background: var(--clr-accent2); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  #nav-toggle { display: flex; align-items: center; justify-content: center; }
  #main-nav {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: var(--clr-surface);
    border-bottom: 1px solid var(--clr-border);
    padding: .75rem 1rem 1.25rem;
    gap: .35rem;
    z-index: 1002;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    box-shadow: 0 8px 32px rgba(0,0,0,.5);
  }
  #main-nav.open { display: flex; }
  #nav-overlay.open { display: block; }
  .nav-btn {
    width: 100%;
    text-align: left;
    padding: .75rem 1rem;
    min-height: 44px;
    display: flex;
    align-items: center;
    border-radius: 8px;
  }

  .inner-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: .35rem;
    scrollbar-width: none;
  }
  .inner-tabs::-webkit-scrollbar { display: none; }
  .inner-tab { flex-shrink: 0; }

  .matrix-row { grid-template-columns: 1fr; }
  .card-grid, .card-grid-3 { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  #hero { padding: 3rem 1rem 2.5rem; }
  .section { padding: 2rem 1rem 4rem; }
  .logo { font-size: 1rem; }
}