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

:root {
  --bg: #0e1117;
  --surface: #161b22;
  --surface-hover: #1c2129;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --green: #3fb950;
  --orange: #d29922;
  --purple: #bc8cff;
  --radius: 12px;
  --max-w: 960px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-hover); }

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}
.site-header .inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: .5rem;
}
.logo span { color: var(--accent); }
.header-nav { display: flex; gap: 1.25rem; }
.header-nav a { color: var(--text-muted); font-size: .9rem; font-weight: 500; }
.header-nav a:hover { color: var(--text); }

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
  flex: 1;
}

.hero { text-align: center; padding: 3rem 0 2rem; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 800; line-height: 1.15; margin-bottom: 1rem; }
.hero h1 .highlight { color: var(--accent); }
.hero p { color: var(--text-muted); font-size: 1.15rem; max-width: 540px; margin: 0 auto; }

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 2.5rem;
}
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform .2s, border-color .2s, box-shadow .2s;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.tool-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(88,166,255,.08);
}
.tool-card .icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: grid; place-items: center; font-size: 1.35rem; flex-shrink: 0;
}
.tool-card h3 { font-size: 1.1rem; font-weight: 600; }
.tool-card p { color: var(--text-muted); font-size: .9rem; flex: 1; }
.tool-card .cta {
  display: inline-flex; align-items: center; gap: .35rem;
  font-size: .875rem; font-weight: 600; color: var(--accent); margin-top: .25rem;
}
.tool-card .cta::after { content: "\2192"; transition: transform .2s; }
.tool-card:hover .cta::after { transform: translateX(4px); }

.icon--blue   { background: rgba(88,166,255,.12); color: var(--accent); }
.icon--green  { background: rgba(63,185,80,.12);  color: var(--green); }
.icon--orange { background: rgba(210,153,34,.12);  color: var(--orange); }
.icon--purple { background: rgba(188,140,255,.12); color: var(--purple); }

.tool-page-header { margin-bottom: 2rem; }
.breadcrumb { font-size: .85rem; color: var(--text-muted); margin-bottom: .75rem; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.tool-page-header h1 { font-size: 1.75rem; font-weight: 700; }
.tool-page-header p { color: var(--text-muted); margin-top: .35rem; }

.tool-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.tool-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
@media (max-width: 640px) { .tool-row { grid-template-columns: 1fr; } }
.tool-col label {
  display: block; font-size: .85rem; font-weight: 600;
  color: var(--text-muted); margin-bottom: .5rem;
  text-transform: uppercase; letter-spacing: .04em;
}

textarea, input[type="text"], input[type="color"], select {
  width: 100%; background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); padding: .75rem 1rem;
  font-family: var(--mono); font-size: .9rem; resize: vertical; transition: border-color .2s;
}
textarea:focus, input:focus, select:focus { outline: none; border-color: var(--accent); }
textarea { min-height: 220px; }

.stats-bar {
  display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 1.25rem;
  padding-top: 1.25rem; border-top: 1px solid var(--border);
}
.stat {
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: .6rem 1rem; display: flex; flex-direction: column; min-width: 110px;
}
.stat .label { font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); }
.stat .value { font-size: 1.35rem; font-weight: 700; font-family: var(--mono); color: var(--accent); }

.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .6rem 1.25rem; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font-size: .875rem;
  font-weight: 600; cursor: pointer; transition: all .2s;
}
.btn:hover { background: var(--surface-hover); border-color: var(--accent); color: var(--accent); }
.btn--primary { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.btn--primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--bg); }
.btn-row { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }

.color-display {
  width: 100%; height: 160px; border-radius: 8px;
  border: 1px solid var(--border); margin-bottom: 1rem; transition: background .15s;
}
.color-values { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
.color-val {
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: .6rem .85rem; cursor: pointer; transition: border-color .2s;
}
.color-val:hover { border-color: var(--accent); }
.color-val .label { font-size: .65rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); }
.color-val .value { font-family: var(--mono); font-size: .9rem; font-weight: 600; }
.color-input-row { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.color-input-row input[type="color"] { width: 56px; height: 44px; padding: 2px; cursor: pointer; border-radius: 8px; }
.color-input-row input[type="text"] { flex: 1; }

.palette { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: 1rem; }
.palette-swatch {
  width: 40px; height: 40px; border-radius: 8px; border: 2px solid transparent;
  cursor: pointer; transition: transform .15s, border-color .15s;
}
.palette-swatch:hover { transform: scale(1.15); border-color: var(--text); }

.toast {
  position: fixed; bottom: 2rem; left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--green); color: var(--bg); padding: .6rem 1.25rem;
  border-radius: 8px; font-size: .875rem; font-weight: 600;
  opacity: 0; transition: all .3s; z-index: 1000; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== Premium Section ===== */
.premium-section {
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}
.premium-inner { text-align: center; }
.premium-inner h2 {
  font-size: 1.35rem; font-weight: 700; margin-bottom: .35rem;
  color: var(--text);
}
.premium-subtitle {
  color: var(--text-muted); font-size: .95rem; margin-bottom: 1.5rem;
}
.premium-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}
.premium-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: left;
  position: relative;
  transition: transform .2s, border-color .2s, box-shadow .2s;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}
.premium-card:hover {
  transform: translateY(-3px);
  border-color: var(--purple);
  box-shadow: 0 8px 24px rgba(188,140,255,.1);
}
.premium-card h3 { font-size: 1.05rem; font-weight: 600; color: var(--text); }
.premium-card p { color: var(--text-muted); font-size: .875rem; flex: 1; }
.premium-card .cta {
  display: inline-flex; align-items: center; gap: .35rem;
  font-size: .875rem; font-weight: 600; color: var(--purple); margin-top: .25rem;
}
.premium-card .cta::after { content: "\2192"; transition: transform .2s; }
.premium-card:hover .cta::after { transform: translateX(4px); }
.premium-badge {
  position: absolute; top: 1rem; right: 1rem;
  background: rgba(188,140,255,.12); color: var(--purple);
  font-size: .75rem; font-weight: 700; padding: .25rem .6rem;
  border-radius: 6px; letter-spacing: .02em;
}

.site-footer {
  border-top: 1px solid var(--border); padding: 1.5rem;
  text-align: center; color: var(--text-muted); font-size: .8rem; margin-top: auto;
}

@media (max-width: 480px) {
  .hero { padding: 2rem 0 1.5rem; }
  .tools-grid { grid-template-columns: 1fr; }
  main { padding: 1.25rem 1rem; }
  .stats-bar { gap: .5rem; }
  .stat { min-width: 90px; padding: .5rem .75rem; }
  .color-values { grid-template-columns: 1fr; }
}