/* ============================================================
 * NetCheck — terminal-flavored CSS. Mobile-first. Dark default.
 * Avoids generic AI aesthetic: monospace everywhere, amber accent,
 * sharp corners, asymmetric spacing, ASCII glyphs as decoration.
 * ============================================================ */

*, *::before, *::after { box-sizing: border-box; }

:root {
  color-scheme: dark light;

  /* Dark palette (default) */
  --bg:            #0a0e14;
  --bg-elev:       #11161e;
  --bg-input:      #0d1218;
  --bg-hover:      #182030;
  --border:        #1c2532;
  --border-strong: #2d3a4e;
  --text:          #d8dee6;
  --text-muted:    #98a1ad;
  --text-dim:      #65707f;
  --accent:        #ffb454;
  --accent-soft:   rgba(255, 180, 84, 0.14);
  --success:       #6ad27f;
  --danger:        #ff6b6b;
  --warning:       #f0883e;
  --info:          #58a6ff;

  --radius:        2px;
  --radius-lg:     4px;
  --space-1:       0.25rem;
  --space-2:       0.5rem;
  --space-3:       0.75rem;
  --space-4:       1rem;
  --space-5:       1.5rem;
  --space-6:       2rem;
  --space-7:       3rem;

  --font-mono:     "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --line:          1.55;

  --shadow-glow:   0 0 0 1px var(--accent-soft);

  --safe-top:      env(safe-area-inset-top, 0px);
  --safe-bottom:   env(safe-area-inset-bottom, 0px);
}

html[data-theme="light"] {
  color-scheme: light dark;
  --bg:            #f6f3ec;
  --bg-elev:       #fffdf7;
  --bg-input:      #efeadd;
  --bg-hover:      #e6dfca;
  --border:        #cdc4ad;
  --border-strong: #9b8e6d;
  --text:          #1a1410;
  --text-muted:    #4d4639;
  --text-dim:      #82786a;
  --accent:        #b85a00;
  --accent-soft:   rgba(184, 90, 0, 0.12);
  --success:       #2b7a3c;
  --danger:        #b91c1c;
  --warning:       #a8520b;
  --info:          #1f6feb;
}

/* honor user OS preference when no manual override is stored */
@media (prefers-color-scheme: light) {
  html:not([data-theme="dark"]):not([data-theme="light"]) { color-scheme: light dark; }
}

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: var(--line);
  font-variant-ligatures: none;
  font-feature-settings: "tnum" 1, "calt" 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
  background-image:
    radial-gradient(circle at 90% -10%, var(--accent-soft), transparent 40%),
    radial-gradient(circle at -10% 95%, var(--accent-soft), transparent 35%);
  background-attachment: fixed;
}

/* ---------- Focus + a11y plumbing ---------- */

:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  scroll-margin-top: 6rem;
}

.skip-link {
  position: absolute;
  inset-inline-start: var(--space-3);
  inset-block-start: -3rem;
  background: var(--accent);
  color: #0a0e14;
  padding: var(--space-2) var(--space-3);
  z-index: 1000;
  text-decoration: none;
  font-weight: 500;
  transition: transform 120ms;
}
.skip-link:focus { transform: translateY(3.5rem); }

::selection { background: var(--accent); color: var(--bg); }

/* ---------- Header ---------- */

.hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) clamp(var(--space-4), 4vw, var(--space-6));
  border-block-end: 1px solid var(--border);
  background: linear-gradient(to bottom, var(--bg-elev), transparent);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.brand {
  margin: 0;
  font-size: clamp(1.1rem, 3.5vw, 1.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  display: flex;
  align-items: baseline;
  gap: 0.05em;
}
.brand-bracket { color: var(--accent); font-weight: 400; }
.brand-cursor {
  color: var(--accent);
  animation: blink 1.2s steps(1) infinite;
  margin-inline-start: 0.05em;
}
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  .brand-cursor { animation: none; }
}

.hdr-actions { display: flex; gap: var(--space-2); }

.icon-btn {
  --size: 2.5rem;
  inline-size: var(--size);
  block-size: var(--size);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  color: var(--text);
  font: inherit;
  font-size: 1.15rem;
  cursor: pointer;
  touch-action: manipulation;
  transition: background-color 120ms, border-color 120ms, transform 120ms;
}
.icon-btn:hover { background: var(--bg-hover); border-color: var(--border-strong); }
.icon-btn:active { transform: translateY(1px); }

/* ---------- Main + cards ---------- */

.main {
  flex: 1;
  inline-size: min(100%, 70rem);
  margin-inline: auto;
  padding: clamp(var(--space-4), 4vw, var(--space-6)) clamp(var(--space-3), 4vw, var(--space-6));
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.card, .result-section, .history-section, .panel {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-block-end: 1px dashed var(--border);
}
.card-head h2 {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
.card-status {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}
.card-status[data-state="ok"] { color: var(--success); }
.card-status[data-state="err"] { color: var(--danger); }

/* ---------- IP card ---------- */

.ip-card { padding-block-end: var(--space-2); }
.ip-grid { margin: 0; padding: var(--space-2) 0; }
.ip-row {
  display: grid;
  grid-template-columns: 7.5rem 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  border-block-end: 1px solid transparent;
}
.ip-row:not(:last-child) { border-block-end-color: var(--border); }
.ip-row dt {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.ip-row dd {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  min-inline-size: 0;
  word-break: break-all;
}
.dim { color: var(--text-dim); }
.badge {
  font-size: 0.65rem;
  padding: 0.1rem 0.35rem;
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
  letter-spacing: 0.05em;
  text-transform: lowercase;
}

.copy-btn, .ghost-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius);
  cursor: pointer;
  touch-action: manipulation;
  min-block-size: 1.75rem;
  transition: color 120ms, border-color 120ms, background-color 120ms;
}
.copy-btn:hover, .ghost-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}
.copy-btn[data-copied="true"] { color: var(--success); border-color: var(--success); }

/* ---------- Tabs ---------- */

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  border-block-end: 1px solid var(--border);
  padding-block-end: var(--space-1);
}
.tabs [role="tab"] {
  border: 1px solid transparent;
  border-block-end: none;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.95rem;
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  min-block-size: 2.25rem;
  touch-action: manipulation;
  transition: color 120ms, background-color 120ms, border-color 120ms;
}
.tabs [role="tab"]:hover { color: var(--text); background: var(--bg-hover); }
.tabs [role="tab"][aria-selected="true"] {
  color: var(--accent);
  border-color: var(--border-strong);
  background: var(--bg-elev);
  box-shadow: inset 0 -2px 0 0 var(--accent);
}
.kbd-hint {
  color: var(--accent);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--accent-soft);
  text-underline-offset: 3px;
}

/* ---------- Panels (form area) ---------- */

.panel {
  padding: var(--space-4);
  border-start-start-radius: 0;
  border-start-end-radius: 0;
}
.panel[hidden] { display: none; }

.tool-form {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  align-items: end;
}
@media (min-width: 40rem) {
  .tool-form {
    grid-template-columns: repeat(auto-fit, minmax(8rem, auto));
    gap: var(--space-3) var(--space-4);
  }
  .tool-form .field-grow { grid-column: 1 / -2; }
  .tool-form .field-small { max-inline-size: 9rem; }
  .tool-form .run-btn { grid-column: -2; align-self: end; }
}

.field { display: flex; flex-direction: column; gap: var(--space-2); min-inline-size: 0; }
.field label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

input[type="text"], input[type="number"], select, textarea {
  font: inherit;
  font-size: 0.95rem;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
  min-block-size: 2.5rem;
  inline-size: 100%;
  transition: border-color 120ms, background-color 120ms;
}
input::placeholder { color: var(--text-dim); }
input:hover, select:hover { border-color: var(--border-strong); }
input:focus-visible, select:focus-visible {
  border-color: var(--accent);
  outline-offset: 0;
  background: var(--bg);
}

select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-muted) 50%),
                    linear-gradient(135deg, var(--text-muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 12px) 50%;
  background-size: 6px 6px;
  background-repeat: no-repeat;
  padding-inline-end: var(--space-7);
}

.run-btn {
  font: inherit;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
  background: var(--accent);
  color: #0a0e14;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-5);
  min-block-size: 2.5rem;
  cursor: pointer;
  touch-action: manipulation;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: background-color 120ms, color 120ms, transform 80ms;
}
.run-btn:hover { background: #0a0e14; color: var(--accent); }
.run-btn:active { transform: translateY(1px); }
.run-btn[aria-busy="true"] { opacity: 0.7; cursor: progress; }
.enter-glyph { font-weight: 400; opacity: 0.7; }

/* ---------- Result ---------- */

.result-section { display: flex; flex-direction: column; }
.result-section[hidden] { display: none; }
.result-body {
  padding: var(--space-4);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.result-body pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: inherit;
}
.result-body table {
  inline-size: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.result-body th, .result-body td {
  text-align: start;
  padding: var(--space-2) var(--space-3);
  border-block-end: 1px dashed var(--border);
  font-weight: 400;
  vertical-align: top;
}
.result-body th {
  color: var(--text-muted);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.result-body .err {
  color: var(--danger);
  border-inline-start: 2px solid var(--danger);
  padding: var(--space-2) var(--space-3);
  background: rgba(255, 107, 107, 0.06);
}
.result-body .ok { color: var(--success); }
.result-body .warn { color: var(--warning); }
.result-body .expired { color: var(--danger); font-weight: 700; }
.result-body .label {
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.result-body .nowrap { white-space: nowrap; }

.spinner {
  display: inline-block;
  inline-size: 0.7em;
  block-size: 0.7em;
  border: 2px solid var(--accent-soft);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 700ms linear infinite;
  vertical-align: -0.15em;
  margin-inline-end: var(--space-2);
}
.spinner-lg {
  inline-size: 1.15rem;
  block-size: 1.15rem;
  border-width: 2.5px;
  vertical-align: middle;
  margin-inline-end: 0;
}
.result-body .loading {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  margin: 0;
  font-size: 0.85rem;
}
.result-body .loading .label { margin: 0; }
.result-body .loading [data-elapsed] {
  margin-inline-start: auto;
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .spinner { animation: none; }
}

/* ---------- History ---------- */

.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.history-list li {
  display: grid;
  grid-template-columns: 4.5rem 5rem 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  border-block-end: 1px solid var(--border);
  font-size: 0.85rem;
  cursor: pointer;
  touch-action: manipulation;
  transition: background-color 120ms;
  min-block-size: 2.25rem;
}
.history-list li:hover, .history-list li:focus-visible {
  background: var(--bg-hover);
  outline: none;
}
.history-list li:last-child { border-block-end: none; }
.history-list .h-ts { color: var(--text-dim); font-size: 0.75rem; }
.history-list .h-tool {
  color: var(--accent);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.history-list .h-input { color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-inline-size: 0; }
.history-list .h-result { color: var(--text-muted); font-size: 0.78rem; text-align: end; }
.history-list .h-result[data-status="err"] { color: var(--danger); }
.history-list .h-result[data-status="ok"] { color: var(--success); }
.history-empty {
  display: block !important;
  grid-template-columns: none !important;
  padding: var(--space-5) !important;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: default !important;
  background: transparent !important;
  border: 0 !important;
}

/* ---------- Footer ---------- */
.ftr {
  border-block-start: 1px solid var(--border);
  padding: var(--space-4);
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-dim);
}
.ftr a { color: var(--text-muted); }
.ftr a:hover { color: var(--accent); }

/* ---------- Dialog ---------- */
dialog {
  border: 1px solid var(--border-strong);
  background: var(--bg-elev);
  color: var(--text);
  padding: 0;
  border-radius: var(--radius-lg);
  max-inline-size: min(28rem, 92vw);
  inline-size: 100%;
}
dialog::backdrop { background: rgba(0, 0, 0, 0.55); backdrop-filter: blur(2px); }
.dialog-body { padding: 0; }
.shortcuts-grid {
  margin: 0;
  padding: var(--space-4);
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--space-3) var(--space-4);
  font-size: 0.9rem;
}
.shortcuts-grid dt { margin: 0; }
.shortcuts-grid dd { margin: 0; color: var(--text-muted); }
kbd {
  display: inline-block;
  font: inherit;
  font-size: 0.8rem;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-block-end-width: 2px;
  border-radius: var(--radius);
  padding: 0.1rem 0.45rem;
  color: var(--text);
}

/* ---------- Card actions (share + copy buttons grouped) ---------- */
.card-actions { display: inline-flex; gap: var(--space-2); }

/* ---------- Panel note (Headers panel has no inputs, just a hint) ---------- */
.field-note {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  align-self: center;
  min-inline-size: 0;
}

/* ---------- Privacy note (WHOIS/RDNS leak origin by design) ---------- */
.privacy-note {
  margin: 0 0 var(--space-3) 0;
  padding: var(--space-2) var(--space-3);
  background: var(--accent-soft);
  border-inline-start: 2px solid var(--accent);
  color: var(--text-muted);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
}

/* ---------- Toast (transient confirmations like "Link copied!") ---------- */
.toast {
  position: fixed;
  inset-block-end: calc(var(--space-5) + var(--safe-bottom));
  inset-inline-start: 50%;
  transform: translateX(-50%) translateY(0);
  background: var(--bg-elev);
  border: 1px solid var(--accent);
  color: var(--text);
  padding: var(--space-3) var(--space-5);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  z-index: 100;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.45), 0 0 0 1px var(--accent-soft);
  border-radius: var(--radius);
  pointer-events: none;
  opacity: 1;
  transition: opacity 180ms, transform 180ms;
}
.toast[hidden] {
  display: block;
  opacity: 0;
  transform: translateX(-50%) translateY(8px);
  pointer-events: none;
}
@media (prefers-reduced-motion: reduce) {
  .toast { transition: none; }
}

/* ---------- Mobile tweaks ---------- */
@media (max-width: 32rem) {
  .ip-row { grid-template-columns: 6rem 1fr auto; gap: var(--space-2); padding-inline: var(--space-3); }
  .ip-row dd { font-size: 0.9rem; }
  .tabs [role="tab"] { padding: var(--space-2); font-size: 0.85rem; }
  .history-list li { grid-template-columns: 1fr; gap: var(--space-1); padding-block: var(--space-3); min-block-size: auto; }
  .history-list .h-result { text-align: start; }
}