/* ============================================================
   itops.theadminstack.com/cidr — Styles
   OSINT Design System v2 · portfolio_v2_style.md
   ============================================================ */

/* ── Tokens (light) ─────────────────────────────────────────── */
:root {
  color-scheme: light;

  /* Surfaces */
  --bg:   #f9fafb;
  --bg-1: #ffffff;
  --bg-2: #f3f4f6;
  --bg-3: #e5e7eb;

  /* Text */
  --text:   #111827;
  --text-2: #4b5563;
  --text-3: #9ca3af;

  /* Borders */
  --border:   #e5e7eb;
  --border-2: #d1d5db;

  /* Accent (monochrome) */
  --accent:        #111827;
  --accent-inv:    #ffffff;
  --accent-subtle: #f3f4f6;
  --accent-glow:   rgba(17,24,39,.08);

  /* Nav */
  --nav-bg: rgba(249,250,251,0.92);
  --nav-h:  64px;

  /* Border radius */
  --r-sm:   6px;
  --r:      10px;
  --r-lg:   14px;
  --r-pill: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow:    0 4px 16px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.05);
  --shadow-lg: 0 10px 32px rgba(0,0,0,.10);

  /* Functional colors */
  --green:  #16a34a;
  --orange: #d97706;
  --red:    #dc2626;

  /* CIDR-specific bit coloring */
  --bit-net:     #111827;
  --bit-host:    #4b5563;
  --bit-net-bg:  rgba(17,24,39,0.12);
  --bit-host-bg: rgba(75,85,99,0.07);

  /* Typography */
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

  /* Layout */
  --container: 1200px;
  --t-mid: 150ms ease;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-top: var(--nav-h);
}

/* ── Nav ─────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  height: var(--nav-h);
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--t-mid);
}
.nav.scrolled { box-shadow: var(--shadow-sm); }

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-brand-mark {
  width: 32px; height: 32px;
  background: var(--accent);
  color: var(--accent-inv);
  border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.nav-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.nav-brand-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}
.nav-brand-sub {
  font-size: 0.7rem;
  color: var(--text-3);
  font-family: var(--font-mono);
}

.nav-sep { flex: 1; }

.nav-back {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-2);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  transition: color var(--t-mid), border-color var(--t-mid), background var(--t-mid);
  white-space: nowrap;
}
.nav-back:hover {
  color: var(--text);
  border-color: var(--border-2);
  background: var(--bg-2);
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  width: 34px; height: 34px;
  cursor: pointer;
  color: var(--text-2);
  display: flex; align-items: center; justify-content: center;
  transition: color var(--t-mid), border-color var(--t-mid), background var(--t-mid);
  flex-shrink: 0;
}
.theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-2);
  background: var(--bg-2);
}

/* ── Hero ────────────────────────────────────────────────────── */
.hero {
  background: var(--bg-1);
  border-bottom: 1px solid var(--border);
  padding: 48px 0 32px;
  text-align: center;
}
.hero-wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 4px 12px;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(1.5rem, 3.5vw, 2.125rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.hero-sub {
  font-size: 0.9375rem;
  color: var(--text-2);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.65;
}

/* ── Main layout ─────────────────────────────────────────────── */
main {
  flex: 1;
  max-width: var(--container);
  width: 100%;
  margin: 0 auto;
  padding: 2rem 24px 4rem;
}

/* ── Tab bar ─────────────────────────────────────────────────── */
.tab-bar {
  display: flex;
  gap: 0.25rem;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 3px;
  margin-bottom: 1.75rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  box-shadow: var(--shadow-sm);
}

.tab-btn {
  flex: 1;
  min-width: 0;
  background: none;
  border: none;
  border-radius: var(--r-sm);
  padding: 6px 14px;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--t-mid), background var(--t-mid);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
}
.tab-btn:hover { color: var(--text); background: var(--accent-subtle); }
.tab-btn.active {
  background: var(--accent);
  color: var(--accent-inv);
}

.tab-icon { font-size: 0.875rem; }

/* ── Tab panels ──────────────────────────────────────────────── */
.tab-panel { display: block; }
.tab-panel[hidden] { display: none; }

/* ── Card ────────────────────────────────────────────────────── */
.card {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 20px 24px;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--t-mid);
}
.card:hover { border-color: var(--border-2); }

.card-title {
  font-size: 0.775rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-3);
  margin-bottom: 1rem;
}

/* ── Form elements ───────────────────────────────────────────── */
.input-row {
  display: flex;
  gap: 0.625rem;
  align-items: flex-end;
  flex-wrap: wrap;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  flex: 1;
  min-width: 180px;
}

label {
  font-size: 0.775rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-2);
}

input[type="text"],
input[type="number"],
textarea {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  padding: 8px 12px;
  color: var(--text);
  outline: none;
  transition: border-color var(--t-mid), box-shadow var(--t-mid);
}
input:focus, textarea:focus {
  border-color: var(--text-3);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
input::placeholder, textarea::placeholder { color: var(--text-3); }

textarea {
  font-size: 0.875rem;
  resize: vertical;
  min-height: 110px;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  padding: 8px 18px;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity var(--t-mid), background var(--t-mid), border-color var(--t-mid), color var(--t-mid);
}
.btn:active { opacity: 0.85; }

.btn-primary {
  background: var(--accent);
  color: var(--accent-inv);
  border-color: var(--accent);
}
.btn-primary:hover { opacity: .88; }

.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border-color: var(--border);
}
.btn-ghost:hover {
  color: var(--text);
  border-color: var(--border-2);
  background: var(--bg-2);
}

.btn-sm {
  padding: 5px 12px;
  font-size: 0.8rem;
}

/* ── Example buttons ─────────────────────────────────────────── */
.examples {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: 0.875rem;
}
.examples-label {
  font-size: 0.75rem;
  color: var(--text-3);
  display: flex;
  align-items: center;
  margin-right: 0.25rem;
}
.example-btn {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 4px 10px;
  cursor: pointer;
  color: var(--text-2);
  transition: background var(--t-mid), color var(--t-mid), border-color var(--t-mid);
}
.example-btn:hover {
  background: var(--bg-3);
  color: var(--text);
  border-color: var(--border-2);
}

/* ── Result area ─────────────────────────────────────────────── */
.result-area {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 20px;
  min-height: 60px;
  transition: border-color var(--t-mid), box-shadow var(--t-mid);
}
.result-area:empty::before {
  content: 'Results will appear here';
  color: var(--text-3);
  font-size: 0.875rem;
}
.result-area.has-result {
  box-shadow: var(--shadow-sm);
  border-color: var(--border-2);
}

/* ── Result table ────────────────────────────────────────────── */
.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.result-table th {
  text-align: left;
  font-size: 0.725rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-3);
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
}
.result-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.result-table tr:last-child td { border-bottom: none; }
.result-table tbody tr:hover { background: var(--bg-2); }

.rt-label {
  color: var(--text-2);
  font-size: 0.8125rem;
  white-space: nowrap;
  width: 45%;
}
.rt-value { color: var(--text); font-weight: 500; }
.rt-note  { color: var(--text-3); font-size: 0.8rem; }

.mono { font-family: var(--font-mono); }
.txt-green { color: var(--green); font-weight: 600; }
.txt-red   { color: var(--red);   font-weight: 600; }

/* ── Range bar ───────────────────────────────────────────────── */
.range-bar-wrap { margin-top: 1rem; }
.range-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 8px 16px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  overflow: hidden;
}
.rb-net, .rb-bcast { color: var(--text-3); white-space: nowrap; }
.rb-range { color: var(--text); font-weight: 600; text-align: center; flex: 1; }

/* ── Alerts ──────────────────────────────────────────────────── */
.alert {
  border-radius: var(--r-sm);
  padding: 12px 16px;
  font-size: 0.875rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  border: 1px solid;
}
.alert-error {
  background: color-mix(in srgb, #dc2626 10%, transparent);
  color: #dc2626;
  border-color: color-mix(in srgb, #dc2626 30%, transparent);
}
.alert-warn {
  background: color-mix(in srgb, #d97706 10%, transparent);
  color: #d97706;
  border-color: color-mix(in srgb, #d97706 30%, transparent);
  margin-bottom: 1rem;
}
.alert-icon { font-weight: 700; flex-shrink: 0; }

/* ── Tags ────────────────────────────────────────────────────── */
.tag {
  display: inline-block;
  background: var(--bg-2);
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 2px 10px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  font-weight: 500;
}

/* ── Subnet Planner ──────────────────────────────────────────── */
.plan-intro {
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0 0 1rem;
  max-width: 60rem;
}
.plan-intro strong { color: var(--text); font-weight: 600; }

/* Controls row: network + mask + buttons + even-split */
.plan-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.75rem;
}
.plan-net-group  { flex: 1 1 200px; }
.plan-mask-group { flex: 0 0 150px; }

.plan-mask-wrap {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  background: var(--bg-1);
  overflow: hidden;
  transition: border-color var(--t-mid), box-shadow var(--t-mid);
}
.plan-mask-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.plan-slash {
  display: flex;
  align-items: center;
  padding: 0 0.55rem;
  background: var(--bg-2);
  color: var(--text-3);
  font-family: var(--font-mono);
  border-right: 1px solid var(--border);
}
.plan-mask-wrap input {
  border: none;
  border-radius: 0;
  background: transparent;
  flex: 1;
  min-width: 0;
}
.plan-mask-wrap input:focus { box-shadow: none; }

.plan-even {
  flex: 0 0 auto;
  height: 40px;
  padding: 0 2rem 0 0.75rem;
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  background: var(--bg-1) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>") no-repeat right 0.6rem center;
  color: var(--text);
  font-size: 0.85rem;
  font-family: var(--font-body);
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}
.plan-even:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.plan-mask-hint {
  font-size: 0.78rem;
  color: var(--text-3);
  margin: 0.5rem 0 0;
}
.plan-mask-hint code {
  font-family: var(--font-mono);
  background: var(--bg-2);
  border-radius: 4px;
  padding: 1px 5px;
}

/* Column-visibility toggles */
.plan-cols {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
}
.plan-cols-label {
  font-weight: 600;
  color: var(--text-2);
  margin-right: 0.15rem;
}
.plan-col-lbl {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-2);
  cursor: pointer;
  user-select: none;
}
.plan-col-lbl:hover { color: var(--text); }
.plan-col-toggle {
  width: 15px;
  height: 15px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* Permalink row */
.plan-permalink-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin: 1rem 0 0;
  font-size: 0.82rem;
  color: var(--text-3);
}
.plan-permalink-row svg { flex-shrink: 0; color: var(--text-3); }
.plan-permalink-row a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 500;
  word-break: break-all;
}
.plan-permalink-row a:hover { opacity: 0.75; }

/* Summary strip above the table */
.plan-summary {
  font-size: 0.9rem;
  color: var(--text-2);
  margin-bottom: 0.9rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.plan-summary strong { color: var(--text); }

/* ── Planner table ───────────────────────────────────────────── */
.plan-table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: var(--r);
}
.plan-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.84rem;
}
.plan-table th {
  text-align: left;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-3);
  padding: 9px 12px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border-2);
  border-right: 1px solid var(--border);
  white-space: nowrap;
}
.plan-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  vertical-align: middle;
  white-space: nowrap;
}
.plan-table tbody tr:last-child td { border-bottom: none; }
.plan-table tbody tr:hover td { background: var(--bg-2); }
.plan-table .pt-subnet { font-weight: 600; color: var(--text); }
.plan-table .pt-num, .plan-table .pt-num-h { text-align: right; }
.plan-table .pt-num { color: var(--text-2); font-variant-numeric: tabular-nums; }

/* Divide control (link-style button) */
.pt-divide, .pt-divide-h { text-align: center; }
.plan-divide {
  border: none;
  background: none;
  padding: 2px 6px;
  color: var(--accent);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border-radius: 4px;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.plan-divide:hover { background: var(--accent-subtle); }
.plan-divide:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.pt-divide-dash { color: var(--text-3); }

/* Join column — nested rowspan cells */
.pt-join-h { text-align: center; }
.plan-table td.pt-join-blank,
.plan-table td.pt-join-cell {
  padding: 0;
  width: 30px;
  min-width: 30px;
  text-align: center;
  vertical-align: middle;
}
.plan-table td.pt-join-blank { background: var(--bg); }
.plan-join {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  min-height: 34px;
  border: none;
  background: var(--bg-2);
  color: var(--text-3);
  font: inherit;
  cursor: pointer;
  transition: background var(--t-mid), color var(--t-mid);
}
.plan-join:hover {
  background: var(--accent);
  color: var(--accent-inv);
}
.plan-join:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.plan-join-label {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  pointer-events: none;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .nav-back { display: none; }
}

@media (max-width: 640px) {
  body { padding-top: var(--nav-h); }
  .hero { padding: 32px 0 24px; }
  .hero-wrap, .footer-inner { padding: 0 16px; }
  main  { padding: 1.25rem 16px 3rem; }
  .nav-inner { padding: 0 16px; }
  .card { padding: 16px; }

  .tab-btn { padding: 5px 10px; font-size: 0.75rem; }
  .tab-icon { display: none; }

  .bin-bit { width: 14px; height: 18px; font-size: 0.7rem; }
  .bin-octet { min-width: 120px; gap: 1px; }

  .input-row { flex-direction: column; }
  .input-group { min-width: 0; width: 100%; }

  .plan-controls { flex-direction: column; align-items: stretch; }
  .plan-net-group, .plan-mask-group, .plan-even { flex: 1 1 auto; width: 100%; }
  .plan-even { box-sizing: border-box; }
  .plan-table { font-size: 0.8rem; }
  .plan-table th, .plan-table td { padding: 7px 9px; }
}