:root {
  --bg-950: #050505;
  --bg-925: #0a0a0a;
  --bg-900: #0f0f0f;
  --surface-border: rgba(255, 255, 255, 0.1);
  --surface-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
  --text-base: #f5f5f5;
  --text-muted: #a1a1aa;
  --text-soft: #71717a;
  --accent: #ff4500;
  --accent-soft: rgba(255, 69, 0, 0.16);
  --signal-low: #22c55e;
  --signal-medium: #f59e0b;
  --signal-high: #ff4500;
  --signal-critical: #ef4444;
  --console-th: #ffffff;
  --console-td: #d4d4d8;
  --static-value: #d4d4d8;
}

body[data-theme="light"] {
  --bg-950: #f4f4f5;
  --bg-925: #ffffff;
  --bg-900: #fafafa;
  --surface-border: rgba(15, 23, 42, 0.12);
  --surface-shadow: 0 20px 60px rgba(15, 23, 42, 0.14);
  --text-base: #111827;
  --text-muted: #4b5563;
  --text-soft: #6b7280;
  --accent-soft: rgba(255, 69, 0, 0.12);
  --console-th: #0f172a;
  --console-td: #334155;
  --static-value: #0f172a;
}

html {
  background: var(--bg-950);
}

body {
  min-height: 100vh;
  margin: 0;
  position: relative;
  isolation: isolate;
  color: var(--text-base);
  font-family: "Inter", sans-serif;
  background:
    radial-gradient(circle at 20% 0%, rgba(255, 69, 0, 0.16), transparent 28%),
    radial-gradient(circle at 80% 20%, rgba(255, 69, 0, 0.08), transparent 24%),
    linear-gradient(180deg, #171717 0%, #0f0f0f 40%, #050505 100%);
  transition:
    background-color 160ms linear,
    color 160ms linear;
}

body[data-theme="light"] {
  background:
    radial-gradient(circle at 20% 0%, rgba(255, 69, 0, 0.14), transparent 28%),
    radial-gradient(circle at 80% 20%, rgba(255, 69, 0, 0.06), transparent 24%),
    linear-gradient(180deg, #ffffff 0%, #f5f5f5 42%, #ebebeb 100%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

button,
input,
textarea,
select {
  font: inherit;
}

:focus-visible {
  outline: 2px solid rgba(255, 69, 0, 0.95);
  outline-offset: 3px;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  box-shadow: 0 0 0 4px rgba(255, 69, 0, 0.18);
}

.app-shell {
  width: min(1600px, calc(100vw - 368px));
  margin: 0 0 0 340px;
  padding: 16px 16px 56px 0;
}

.panel {
  background: rgba(10, 10, 10, 0.58);
  border: 1px solid var(--surface-border);
  /* border-radius: 28px; */
  padding: 20px;
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: var(--surface-shadow);
}

body[data-theme="light"] .panel {
  background: rgba(255, 255, 255, 0.68);
}

.nav-drawer {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 60;
  width: 308px;
  height: calc(100vh - 32px);
  padding: 18px;
  /* border-radius: 28px; */
  border-right: 1px solid var(--surface-border);
  background: rgba(10, 10, 10, 0.62);
  backdrop-filter: blur(24px) saturate(170%);
  -webkit-backdrop-filter: blur(24px) saturate(170%);
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 18px;
  box-shadow: var(--surface-shadow);
}

.nav-drawer__header,
.nav-drawer__footer {
  padding: 0 2px;
}

.drawer-title {
  margin: 0;
  font-size: 1.4rem;
  font-weight: 400;
  letter-spacing: -0.03em;
}

.nav-menu {
  display: grid;
  gap: 10px;
  align-content: start;
}

.nav-link {
  width: 100%;
  border: 1px solid var(--surface-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-base);
  text-align: left;
  padding: 14px 14px;
  cursor: pointer;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  /* border-radius: 18px; */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-link.is-active,
.nav-link:hover {
  border-color: rgba(255, 69, 0, 0.75);
  background: rgba(255, 69, 0, 0.12);
}

.theme-toggle--drawer {
  width: 100%;
}

.mode-panel {
  display: none;
}

body[data-mode="overview"] #controlsPanel,
body[data-mode="overview"] .overview-panel,
body[data-mode="vlsm"] #vlsmPanel,
body[data-mode="splitter"] #tablePanel {
  display: grid;
}

body[data-mode="overview"] .overview-panel,
body[data-mode="vlsm"] #vlsmPanel,
body[data-mode="splitter"] #tablePanel {
  margin-top: 0;
}

body[data-mode="overview"] .overview-panel,
body[data-mode="overview"] #controlsPanel {
  display: grid;
}

body[data-mode="vlsm"] #controlsPanel,
body[data-mode="vlsm"] .overview-panel,
body[data-mode="vlsm"] #tablePanel,
body[data-mode="splitter"] #controlsPanel,
body[data-mode="splitter"] .overview-panel,
body[data-mode="splitter"] #vlsmPanel {
  display: none;
}

body[data-mode="overview"] #vlsmPanel,
body[data-mode="overview"] #tablePanel {
  display: none;
}

body[data-mode="vlsm"] #vlsmPanel {
  display: grid;
}

body[data-mode="splitter"] #tablePanel {
  display: grid;
}

.hero-panel {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 20px;
}

.metadata-sandwich {
  display: grid;
  gap: 4px;
}

.meta-label {
  color: #737373;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  line-height: 1.4;
}

.hero-title,
.section-title {
  margin: 0;
  font-weight: 300;
  color: #ffffff;
  line-height: 1.02;
}

body[data-theme="light"] .hero-title,
body[data-theme="light"] .section-title,
body[data-theme="light"] .result-value,
body[data-theme="light"] .console-table th {
  color: #111827;
}

body[data-theme="light"] .panel,
body[data-theme="light"] .result-card,
body[data-theme="light"] .binary-card,
body[data-theme="light"] .bitmap-wrap,
body[data-theme="light"] .table-shell,
body[data-theme="light"] .terminal-input,
body[data-theme="light"] .preset-btn,
body[data-theme="light"] .copy-btn,
body[data-theme="light"] .theme-toggle {
  background: rgba(255, 255, 255, 0.72);
}

body[data-theme="light"] .console-table th {
  background: #f8fafc;
}

body[data-theme="light"] .nav-drawer {
  background: rgba(255, 255, 255, 0.72);
}

body[data-theme="light"] .nav-link {
  background: rgba(255, 255, 255, 0.55);
}

body[data-theme="light"] .terminal-input,
body[data-theme="light"] .preset-btn,
body[data-theme="light"] .copy-btn,
body[data-theme="light"] .theme-toggle {
  color: #111827;
}

body[data-theme="light"] .terminal-input:focus,
body[data-theme="light"] .terminal-textarea:focus {
  background: #fff;
}

.hero-title {
  font-size: clamp(2.6rem, 4.8vw, 5rem);
  letter-spacing: -0.05em;
}

.section-title {
  font-size: clamp(1.6rem, 2.4vw, 2.35rem);
  letter-spacing: -0.03em;
}

.meta-body {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.55;
  max-width: 72ch;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.theme-toggle {
  align-self: center;
  border: 1px solid var(--surface-border);
  background: rgba(9, 9, 9, 0.58);
  color: #ffffff;
  padding: 10px 14px;
  /* border-radius: 14px; */
  cursor: pointer;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.theme-toggle:hover {
  border-color: rgba(255, 69, 0, 0.55);
}

.signal-chip {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 10px 12px;
  border: 1px solid var(--surface-border);
  background: rgba(16, 16, 16, 0.58);
  /* border-radius: 999px; */
}

.signal-low {
  color: var(--signal-low);
}
.signal-medium {
  color: var(--signal-medium);
}
.signal-high {
  color: var(--signal-high);
}
.signal-critical {
  color: var(--signal-critical);
}

.page-grid {
  display: grid;
  gap: 20px;
}

.controls-panel,
.overview-panel,
.binary-panel,
.bitmap-panel,
.vlsm-panel,
.table-panel {
  display: grid;
  gap: 20px;
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.field {
  display: grid;
  gap: 8px;
}

.field-label {
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
}

.terminal-input {
  width: 100%;
  border: 1px solid var(--surface-border);
  background: rgba(8, 8, 8, 0.58);
  color: #fff;
  /* border-radius: 18px; */
  padding: 14px 16px;
  outline: none;
  transition:
    border-color 140ms linear,
    background-color 140ms linear;
  font-family: "JetBrains Mono", monospace;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.terminal-input::placeholder,
.terminal-textarea::placeholder {
  color: #52525b;
}

.terminal-input:focus,
.terminal-textarea:focus {
  border-color: rgba(255, 69, 0, 0.65);
  background: rgba(12, 12, 12, 0.72);
}

.terminal-textarea {
  min-height: 140px;
  resize: vertical;
}

.quick-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.preset-btn,
.copy-btn {
  border: 1px solid var(--surface-border);
  background: rgba(9, 9, 9, 0.58);
  color: #d4d4d8;
  padding: 10px 12px;
  /* border-radius: 14px; */
  cursor: pointer;
  transition:
    border-color 140ms linear,
    color 140ms linear,
    background-color 140ms linear;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.preset-btn:hover,
.copy-btn:hover {
  border-color: rgba(255, 69, 0, 0.55);
  color: #fff;
}

.copy-btn.is-active,
.preset-btn.is-active {
  background: var(--accent-soft);
  color: #fff;
  border-color: rgba(255, 69, 0, 0.75);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.result-card {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--surface-border);
  background: rgba(11, 11, 11, 0.5);
  /* border-radius: 22px; */
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
}

.result-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
}

.result-value {
  font-size: clamp(1.15rem, 1.55vw, 1.65rem);
  line-height: 1.15;
  font-weight: 400;
  color: #ffffff;
  word-break: break-word;
}

.result-subtext {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.5;
  word-break: break-word;
}

.binary-stack {
  display: grid;
  gap: 20px;
}

.binary-card,
.bitmap-wrap,
.table-shell {
  border: 1px solid var(--surface-border);
  background: rgba(9, 9, 9, 0.5);
  /* border-radius: 22px; */
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
}

.binary-card {
  padding: 16px;
  display: grid;
  gap: 12px;
}

.binary-head,
.section-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.binary-head {
  color: #e5e7eb;
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.bit-row {
  display: grid;
  grid-template-columns: repeat(32, minmax(0, 1fr));
  gap: 2px;
}

.bit {
  display: grid;
  place-items: center;
  min-height: 30px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  line-height: 1;
  user-select: none;
}

.bit.network {
  color: #fff;
  background: rgba(255, 69, 0, 0.22);
  border-color: rgba(255, 69, 0, 0.35);
}

.bit.host {
  color: #d4d4d8;
  background: #080808;
}

.bit.group-start {
  margin-left: 6px;
}

.bitmap-wrap {
  padding: 18px;
  display: grid;
  gap: 14px;
}

.bitmap-grid {
  display: grid;
  grid-template-columns: repeat(32, minmax(0, 1fr));
  gap: 2px;
}

.bitmap-bit {
  min-height: 22px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: #101010;
}

.bitmap-bit.network {
  background: rgba(255, 69, 0, 0.8);
}

.bitmap-bit.host {
  background: #262626;
}

.bitmap-bit.zero {
  background: #171717;
}

.bitmap-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--text-muted);
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.legend-swatch {
  width: 12px;
  height: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.legend-network {
  background: rgba(255, 69, 0, 0.8);
}

.legend-host {
  background: #262626;
}

.inline-note,
.static-value {
  color: var(--static-value);
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.table-controls {
  align-items: end;
}

.field-static {
  align-content: start;
}

.table-shell {
  overflow: auto;
}

.console-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 820px;
}

.console-table th,
.console-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  vertical-align: top;
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  color: var(--console-td);
}

.console-table th {
  color: var(--console-th);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 10px;
  background: rgba(13, 13, 13, 0.7);
}

body[data-theme="light"] .console-table th {
  background: rgba(248, 250, 252, 0.92);
}

body[data-theme="light"] .nav-link,
body[data-theme="light"] .theme-toggle {
  color: #0f172a;
}

.console-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

body[data-theme="light"] .console-table tr:hover td {
  background: rgba(15, 23, 42, 0.03);
}

.severity {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 5px 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 10px;
  line-height: 1;
}

.severity.low {
  color: var(--signal-low);
}
.severity.medium {
  color: var(--signal-medium);
}
.severity.high {
  color: var(--signal-high);
}
.severity.critical {
  color: var(--signal-critical);
}

@media (max-width: 1180px) {
  .results-grid,
  .input-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    flex-direction: column;
    align-items: start;
  }

  .nav-drawer {
    width: 284px;
  }

  .app-shell {
    margin-left: 316px;
    width: calc(100vw - 332px);
  }
}

@media (max-width: 820px) {
  body {
    padding: 0;
  }

  .nav-drawer {
    position: sticky;
    top: 0;
    left: auto;
    width: min(100%, 1600px);
    height: auto;
    margin: 0 0 12px;
    border-right: 1px solid var(--surface-border);
    border-bottom: 1px solid var(--surface-border);
    padding: 14px;
    /* border-radius: 0 0 24px 24px; */
    grid-template-rows: auto auto auto;
    gap: 12px;
    z-index: 65;
  }

  .nav-menu {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .nav-link {
    text-align: center;
    padding: 12px 10px;
  }

  .nav-drawer__footer {
    display: grid;
  }

  .app-shell {
    width: min(100%, 1600px);
    margin-left: 0;
    padding: 0 8px 44px;
  }

  .panel {
    padding: 16px;
    /* border-radius: 22px; */
  }

  body[data-mode="overview"] #controlsPanel,
  body[data-mode="overview"] .overview-panel,
  body[data-mode="vlsm"] #vlsmPanel,
  body[data-mode="splitter"] #tablePanel {
    display: grid;
  }

  .bit-row,
  .bitmap-grid {
    gap: 1px;
  }

  .bit,
  .bitmap-bit {
    min-height: 20px;
  }

  .hero-panel {
    gap: 12px;
  }

  .results-grid {
    gap: 14px;
  }

  .quick-presets,
  .section-action-row {
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}