/* ==========================================================================
   SafeGrd Design System — "Instrument"
   Single source of truth for tokens and primitives. Loaded by EVERY page,
   before any page-specific stylesheet.

   Read css/STYLE.md before adding anything here or overriding anything from
   here. The short version:
     - Never introduce a colour literal. Use a token.
     - signal = system/normal, status = verified/healthy, alarm = failure,
       warn = degraded. Colour carries meaning; do not pick by taste.
     - Zero border-radius. Everything is square.
     - One grotesk (--sans) + one mono (--mono). No third family.
   ========================================================================== */

/* --- Tokens ---------------------------------------------------------------
   Light is the default scheme; dark overrides only the values, never the
   names. Anything defined only inside a media query is a bug.
   -------------------------------------------------------------------------- */

:root {
  /* Surfaces */
  --ground:   #edeff2;   /* page background */
  --panel:    #f7f8fa;   /* raised surface: cards, modals, inputs */
  --panel-2:  #e3e6eb;   /* recessed surface: table headers, panel chrome */

  /* Ink */
  --ink:      #0c0e12;   /* primary text */
  --ink-2:    #474d58;   /* body / secondary text */
  --ink-3:    #5f6775;   /* labels, metadata, disabled — WCAG AA on every surface */

  /* Structure */
  --line:     #c3c9d2;   /* primary hairline */
  --line-2:   #d7dbe2;   /* secondary hairline, inner dividers */
  --dot:      #c8ced7;   /* graph-paper ground */

  /* Semantic colour — see STYLE.md §3. These are not interchangeable. */
  --signal:   #1438dc;   /* system / normal / interactive */
  --signal-2: rgba(20, 56, 220, .07);
  --status:   #00704f;   /* verified, healthy, passed */
  --status-2: rgba(0, 129, 91, .10);
  --alarm:    #b23a09;   /* failure, frozen, destructive */
  --alarm-2:  rgba(216, 58, 24, .09);
  --warn:     #7d5300;   /* degraded, stale, approaching a limit */
  --warn-2:   rgba(154, 103, 0, .10);

  /* The inverted band keeps its own pair so it never flips with the scheme. */
  --band-bg:   #0c0e12;
  --band-fg:   #eef0f4;
  --band-line: #272c36;

  /* Type */
  --sans: "Helvetica Neue", Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* Type scale — nothing in the UI may go below --fs-micro. See STYLE.md §4. */
  --fs-micro: 11px;     /* floor: copy buttons, densest specs */
  --fs-label: 12px;     /* mono uppercase: tags, badges, form + table labels */
  --fs-ui:    12.5px;   /* buttons, nav links, tabs */
  --fs-data:  13.5px;   /* mono data: code boxes, IDs, digests, readouts */
  --fs-table: 14.5px;   /* table cells */
  --fs-body:  15.5px;   /* prose */

  /* Metrics */
  --gutter:  clamp(18px, 4.5vw, 56px);
  --measure: 1280px;
  --nav-h:   58px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground:   #0c0e12;
    --panel:    #13161c;
    --panel-2:  #181c24;
    --ink:      #eef0f4;
    --ink-2:    #a2aab8;
    --ink-3:    #7b8494;
    --line:     #262b34;
    --line-2:   #1d222a;
    --dot:      #222732;
    --signal:   #5c7cff;
    --signal-2: rgba(92, 124, 255, .11);
    --status:   #00e08a;
    --status-2: rgba(0, 224, 138, .12);
    --alarm:    #ff6a45;
    --alarm-2:  rgba(255, 106, 69, .12);
    --warn:     #e0a33c;
    --warn-2:   rgba(224, 163, 60, .12);
    --band-bg:   #05060a;
    --band-fg:   #eef0f4;
    --band-line: #1b1f28;
  }
}

:root[data-theme="dark"] {
  --ground:   #0c0e12;
  --panel:    #13161c;
  --panel-2:  #181c24;
  --ink:      #eef0f4;
  --ink-2:    #a2aab8;
  --ink-3:    #7b8494;
  --line:     #262b34;
  --line-2:   #1d222a;
  --dot:      #222732;
  --signal:   #5c7cff;
  --signal-2: rgba(92, 124, 255, .11);
  --status:   #00e08a;
  --status-2: rgba(0, 224, 138, .12);
  --alarm:    #ff6a45;
  --alarm-2:  rgba(255, 106, 69, .12);
  --warn:     #e0a33c;
  --warn-2:   rgba(224, 163, 60, .12);
  --band-bg:   #05060a;
  --band-fg:   #eef0f4;
  --band-line: #1b1f28;
}

/* --- Reset ----------------------------------------------------------------- */

* { box-sizing: border-box; margin: 0; padding: 0; border-radius: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background-color: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--fs-body);
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}

::selection { background: var(--signal); color: #fff; }

/* --- Base type ------------------------------------------------------------- */

h1, h2, h3, h4 {
  color: var(--ink);
  font-weight: 800;
  letter-spacing: -.025em;
  text-transform: uppercase;
  line-height: 1.1;
}

p { color: var(--ink-2); }

a { color: var(--signal); text-decoration: none; transition: color .15s; }
a:hover { color: var(--ink); }

code, pre, .mono { font-family: var(--mono); }

:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }

/* --- Layout ---------------------------------------------------------------- */

.wrap { max-width: var(--measure); margin: 0 auto; padding-inline: var(--gutter); }

/* --- Drafting primitives ---------------------------------------------------
   The visual grammar of the language: registration brackets, tick rules,
   dimension lines. Use these instead of shadows, glows or rounded chrome.
   ---------------------------------------------------------------------------- */

/* Registration brackets on a diagonal pair of corners. */
.module { position: relative; border: 1px solid var(--line); background: var(--panel); }

.module::before,
.module::after {
  content: "";
  position: absolute;
  width: 11px; height: 11px;
  border: 2px solid var(--signal);
  pointer-events: none;
}

.module::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.module::after  { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

/* A rule with downward tick marks, like a measuring edge. */
.tick-rule {
  height: 9px;
  border-top: 1px solid var(--line);
  background-image: repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px 22px);
}

/* A dimension line with end caps. */
.dim { position: relative; height: 1px; background: var(--signal); margin: 7px 0 5px; }

.dim::before, .dim::after {
  content: "";
  position: absolute;
  top: -4px;
  width: 1px; height: 9px;
  background: var(--signal);
}

.dim::before { left: 0; }
.dim::after  { right: 0; }

/* Small uppercase mono label. The default for any piece of metadata. */
.tag, .dim-label {
  font-family: var(--mono);
  font-size: var(--fs-label);
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.dim-label b { color: var(--ink); font-weight: 700; }

.sec-no {
  display: inline-block;
  font-family: var(--mono);
  font-size: var(--fs-label);
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--signal);
}

/* Status readout: an instrument reading, not a decorative stamp. */
.readout {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 13px;
  border: 1px solid var(--status);
  background: var(--status-2);
  font-family: var(--mono);
  font-size: var(--fs-label);
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--status);
}

.readout .led {
  width: 8px; height: 8px;
  background: var(--status);
  flex: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--status) 20%, transparent);
}

.readout small { display: block; font-weight: 400; font-size: var(--fs-micro); letter-spacing: .1em; opacity: .85; }

.readout-alarm { border-color: var(--alarm); background: var(--alarm-2); color: var(--alarm); }
.readout-alarm .led { background: var(--alarm); box-shadow: 0 0 0 3px color-mix(in srgb, var(--alarm) 20%, transparent); }

.readout-warn { border-color: var(--warn); background: var(--warn-2); color: var(--warn); }
.readout-warn .led { background: var(--warn); box-shadow: 0 0 0 3px color-mix(in srgb, var(--warn) 20%, transparent); }

/* A drawn state marker — replaces decorative emoji in banners. */
.state-mark {
  flex: none;
  display: inline-block;
  width: 12px; height: 12px;
  border: 1px solid var(--ink-3);
  border-left-width: 3px;
}

.state-mark-signal { border-color: var(--signal); }
.state-mark-alarm  { border-color: var(--alarm); }
.state-mark-status { border-color: var(--status); }
.state-mark-warn   { border-color: var(--warn); }

/* Empty-state marker: a registration target at rest. */
.empty-mark {
  position: relative;
  display: inline-block;
  width: 26px; height: 26px;
  margin-bottom: 12px;
  border: 1px solid var(--line);
}

.empty-mark::before,
.empty-mark::after { content: ""; position: absolute; background: var(--line); }
.empty-mark::before { left: 50%; top: -5px; bottom: -5px; width: 1px; transform: translateX(-50%); }
.empty-mark::after  { top: 50%; left: -5px; right: -5px; height: 1px; transform: translateY(-50%); }

/* --- Chrome: header nav ------------------------------------------------------ */

.header-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: var(--nav-h);
  background: color-mix(in srgb, var(--ground) 90%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
  padding: 12px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-family: var(--mono);
  font-size: var(--fs-data);
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink);
}

.nav-brand:hover { color: var(--ink); }

/* The brand mark is a drawn registration target, not a glyph. */
.nav-brand .shield {
  position: relative;
  display: inline-block;
  width: 11px; height: 11px;
  flex: none;
  border: 1px solid var(--signal);
}

.nav-brand .shield::before,
.nav-brand .shield::after { content: ""; position: absolute; background: var(--signal); }
.nav-brand .shield::before { left: 50%; top: -3px; bottom: -3px; width: 1px; transform: translateX(-50%); }
.nav-brand .shield::after  { top: 50%; left: -3px; right: -3px; height: 1px; transform: translateY(-50%); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
  font-family: var(--mono);
  font-size: var(--fs-ui);
  letter-spacing: .1em;
  text-transform: uppercase;
}

.nav-links a { color: var(--ink-2); }
.nav-links a:hover { color: var(--signal); }
/* `.nav-links a` outranks `.btn`; restore the button's own colours. */
.nav-links a.btn { color: #fff; }
.nav-links a.btn:hover { color: var(--ground); }
.nav-links a.btn-secondary { color: var(--ink); }
.nav-links a.btn-secondary:hover { color: var(--signal); }

/* --- Buttons -----------------------------------------------------------------
   Canonical set: .btn (primary) / .btn-secondary (outline) / .btn-danger.
   Modifiers: .btn-sm, .btn-block. There is no emerald or cyan button.
   ------------------------------------------------------------------------------ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-family: var(--mono);
  font-size: var(--fs-ui);
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  border: 1px solid var(--signal);
  background: var(--signal);
  color: #fff;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}

.btn:hover { background: var(--ink); border-color: var(--ink); color: var(--ground); }

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn-secondary:hover { background: transparent; color: var(--signal); border-color: var(--signal); }

.btn-danger {
  background: var(--alarm-2);
  color: var(--alarm);
  border-color: var(--alarm);
}

.btn-danger:hover { background: var(--alarm); color: #fff; }

.btn-sm    { padding: 7px 14px; font-size: var(--fs-label); }
.btn-block { width: 100%; }

.btn:disabled, .btn[disabled] { opacity: .45; cursor: not-allowed; }

/* --- Forms -------------------------------------------------------------------- */

.form-group { margin-bottom: 20px; text-align: left; }

.form-label {
  display: block;
  font-family: var(--mono);
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--ink-3);
  margin-bottom: 7px;
  text-transform: uppercase;
  letter-spacing: .13em;
}

.input-wrapper { position: relative; display: flex; align-items: center; }

.form-input {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 12px 14px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--fs-body);
  transition: border-color .15s, box-shadow .15s;
  outline: none;
}

.form-input:focus {
  border-color: var(--signal);
  box-shadow: 0 0 0 3px var(--signal-2);
}

.form-input::placeholder { color: var(--ink-3); }

select.form-input {
  appearance: none;
  padding-right: 34px;
  cursor: pointer;
  /* Chevron drawn as two hairlines; no icon font, no asset. */
  background-image:
    linear-gradient(45deg, transparent 50%, var(--ink-3) 50%),
    linear-gradient(135deg, var(--ink-3) 50%, transparent 50%);
  background-position: calc(100% - 18px) calc(50% + 1px), calc(100% - 13px) calc(50% + 1px);
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

.toggle-password-btn {
  position: absolute;
  right: 10px;
  background: transparent;
  border: 0;
  color: var(--ink-3);
  cursor: pointer;
  font-family: var(--mono);
  font-size: var(--fs-label);
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 4px;
}

.toggle-password-btn:hover { color: var(--signal); }

/* --- Panels --------------------------------------------------------------------
   .card is the plain surface. .card-signal / .card-alarm mark a panel that
   carries a system or failure state — they are not decoration.
   --------------------------------------------------------------------------------- */

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 22px;
  transition: border-color .15s;
}

.card:hover { border-color: var(--ink-3); }

.card-signal { border-color: var(--signal); border-left-width: 3px; }
.card-alarm  { border-color: var(--alarm);  border-left-width: 3px; }
.card-status { border-color: var(--status); border-left-width: 3px; }

/* --- Badges ----------------------------------------------------------------------
   Named for what they mean, never for their colour. See STYLE.md §3.
   ----------------------------------------------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: var(--fs-label);
  font-weight: 700;
  padding: 4px 9px;
  letter-spacing: .1em;
  text-transform: uppercase;
  border: 1px solid;
}

.badge-status  { background: var(--status-2); color: var(--status); border-color: var(--status); }
.badge-signal  { background: var(--signal-2); color: var(--signal); border-color: var(--signal); }
.badge-alarm   { background: var(--alarm-2);  color: var(--alarm);  border-color: var(--alarm); }
.badge-warn    { background: var(--warn-2);   color: var(--warn);   border-color: var(--warn); }
.badge-neutral { background: transparent;     color: var(--ink-3);  border-color: var(--line); }

/* --- Tables ------------------------------------------------------------------------ */

.table-container { overflow-x: auto; border: 1px solid var(--line); }

table.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: var(--fs-table);
}

table.data-table th {
  background: var(--panel-2);
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: var(--fs-label);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .13em;
  padding: 11px 15px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

table.data-table td {
  padding: 13px 15px;
  border-bottom: 1px solid var(--line-2);
  color: var(--ink);
}

table.data-table tr:last-child td { border-bottom: 0; }
table.data-table tr:hover td { background: var(--panel); }

/* --- Code box ------------------------------------------------------------------------ */

.code-box {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 11px 13px;
  font-family: var(--mono);
  font-size: var(--fs-data);
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  overflow-x: auto;
}

.copy-btn,
.code-box button.copy-btn {
  flex: none;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-3);
  padding: 4px 9px;
  font-family: var(--mono);
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color .15s, border-color .15s;
}

.copy-btn:hover,
.code-box button.copy-btn:hover { color: var(--signal); border-color: var(--signal); }

/* --- Modal --------------------------------------------------------------------------- */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, var(--band-bg) 78%, transparent);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

.modal-content {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  max-width: 520px;
  width: 100%;
  padding: 26px;
}

.modal-content::before,
.modal-content::after {
  content: "";
  position: absolute;
  width: 11px; height: 11px;
  border: 2px solid var(--signal);
}

.modal-content::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.modal-content::after  { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

/* --- Alert banner ---------------------------------------------------------------------- */

.alert-banner {
  padding: 12px 15px;
  font-size: 14px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid;
  border-left-width: 3px;
}

.alert-banner.error   { background: var(--alarm-2);  border-color: var(--alarm);  color: var(--alarm); }
.alert-banner.success { background: var(--status-2); border-color: var(--status); color: var(--status); }
.alert-banner.warn    { background: var(--warn-2);   border-color: var(--warn);   color: var(--warn); }
.alert-banner.info    { background: var(--signal-2); border-color: var(--signal); color: var(--signal); }