/* ==========================================================================
   ARG «Нулевой индекс» (Zero Index) — Core Terminal Design System
   ========================================================================== */

:root {
  /* Color Palette — Obsidian Terminal & Telemetry */
  --color-background: #070c10;
  --color-surface: #0e161e;
  --color-surface-hover: #131f2b;
  --color-elevated: #15222d;
  --color-elevated-hover: #1a2a38;
  --color-overlay: rgba(7, 12, 16, 0.88);
  
  --color-text: #c9d7e3;
  --color-text-bright: #f0f6fc;
  --color-muted: #748c9f;
  
  --color-accent: #38bdf8;
  --color-accent-hover: #7dd3fc;
  --color-accent-bg: rgba(56, 189, 248, 0.12);
  
  --color-emerald: #34d399;
  --color-emerald-bg: rgba(52, 211, 153, 0.12);
  
  --color-amber: #fbbf24;
  --color-amber-bg: rgba(251, 191, 36, 0.14);
  
  --color-rose: #f87171;
  --color-rose-bg: rgba(248, 113, 113, 0.14);
  
  --color-focus: #fbbf24;
  --color-border: #1e3142;
  --color-border-bright: #2d4a63;
  --color-border-glow: rgba(56, 189, 248, 0.35);

  /* Spacing Scale */
  --space-1: 0.5rem;   /* 8px */
  --space-2: 1rem;     /* 16px */
  --space-3: 1.5rem;   /* 24px */
  --space-4: 2rem;     /* 32px */
  --space-5: 2.5rem;   /* 40px */
  --space-6: 3rem;     /* 48px */
  --space-8: 4rem;     /* 64px */

  /* Radii & Effects */
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --glow-accent: 0 0 16px rgba(56, 189, 248, 0.2);
  --glow-emerald: 0 0 16px rgba(52, 211, 153, 0.2);
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.4);

  /* Typography */
  --font-mono: ui-monospace, "Cascadia Code", "JetBrains Mono", "PT Mono", Menlo, Consolas, monospace;
  font-family: var(--font-mono);
}

/* ==========================================================================
   CSS Reset & Base Rules
   ========================================================================== */

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

html {
  background-color: var(--color-background);
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(21, 34, 45, 0.6), transparent 70%),
    linear-gradient(180deg, var(--color-background) 0%, #05080b 100%);
  background-attachment: fixed;
  color: var(--color-text);
}

/* Accessible focus styling */
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 1000;
  transform: translateY(-200%);
  background: var(--color-amber);
  color: #070c10;
  font-weight: 700;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: transform 0.15s cubic-bezier(0.16, 1, 0.3, 1);
}

.skip-link:focus {
  transform: translateY(0);
}

/* Links */
a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.25em;
  transition: color 0.15s ease, text-shadow 0.15s ease;
}

a:hover {
  color: var(--color-accent-hover);
  text-shadow: 0 0 8px rgba(56, 189, 248, 0.4);
}

/* Typography elements */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2);
  color: var(--color-text-bright);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

h1 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); }
h2 { font-size: clamp(1.3rem, 2.5vw, 1.7rem); margin-top: var(--space-4); }
h3 { font-size: 1.15rem; margin-top: var(--space-3); }

p {
  margin: 0 0 var(--space-2);
}

.eyebrow {
  display: inline-block;
  margin-bottom: var(--space-1);
  color: var(--color-muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.eyebrow::before {
  content: "// ";
  color: var(--color-accent);
}

/* ==========================================================================
   Header HUD & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-overlay);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-3);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.brand-container {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.brand-link {
  color: var(--color-text-bright);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.05em;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.brand-link .bracket {
  color: var(--color-accent);
}

.brand-link:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.site-header nav a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.92rem;
  padding: var(--space-1) 0;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
}

.site-header nav a:hover,
.site-header nav a:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  text-decoration: none;
}

.header-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.hud-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  padding: 0.3rem 0.65rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  text-decoration: none;
}

.hud-badge strong {
  color: var(--color-text-bright);
}

a.hud-badge:hover,
.hud-badge.guest-badge:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-muted);
  display: inline-block;
}

.status-dot.online {
  background: var(--color-emerald);
  box-shadow: 0 0 6px var(--color-emerald);
}

.status-dot.active {
  background: var(--color-accent);
  box-shadow: 0 0 6px var(--color-accent);
}

.status-dot.alert {
  background: var(--color-amber);
  box-shadow: 0 0 6px var(--color-amber);
}

/* ==========================================================================
   Main Content Shell & Containers
   ========================================================================== */

main {
  width: min(76rem, 100%);
  margin: 0 auto;
  padding: clamp(var(--space-3), 4vw, var(--space-6)) var(--space-3);
  flex: 1;
}

.reading-column {
  max-width: 48rem;
}

.container-narrow {
  max-width: 36rem;
}

.grid-two {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-3);
}

.grid-three {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-3);
}

/* ==========================================================================
   Terminal Cards & Dossier Panels
   ========================================================================== */

.terminal-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-subtle);
  position: relative;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.terminal-card:hover {
  border-color: var(--color-border-bright);
}

.terminal-card.highlight {
  border-color: var(--color-border-bright);
  background: linear-gradient(180deg, var(--color-elevated) 0%, var(--color-surface) 100%);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.82rem;
  color: var(--color-muted);
}

.card-header .card-tag {
  color: var(--color-accent);
  font-weight: 700;
}

/* Terminal Pills & Status Indicators */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.status-pill.emerald {
  background: var(--color-emerald-bg);
  color: var(--color-emerald);
  border: 1px solid rgba(52, 211, 153, 0.3);
}

.status-pill.cyan {
  background: var(--color-accent-bg);
  color: var(--color-accent);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.status-pill.amber {
  background: var(--color-amber-bg);
  color: var(--color-amber);
  border: 1px solid rgba(251, 191, 36, 0.3);
}

.status-pill.rose {
  background: var(--color-rose-bg);
  color: var(--color-rose);
  border: 1px solid rgba(248, 113, 113, 0.3);
}

/* Action Cards */
.action-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  color: var(--color-text);
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.action-card:hover {
  border-color: var(--color-accent);
  background: var(--color-elevated);
  transform: translateY(-2px);
  box-shadow: var(--glow-accent);
  text-decoration: none;
  color: var(--color-text-bright);
}

.action-card h3 {
  margin: 0 0 var(--space-1);
  color: var(--color-text-bright);
}

.action-card:hover h3 {
  color: var(--color-accent);
}

/* ==========================================================================
   Forms, Controls, Inputs & Buttons
   ========================================================================== */

form {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

fieldset {
  margin: 0 0 var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: rgba(14, 22, 30, 0.4);
}

legend {
  color: var(--color-text-bright);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0 var(--space-1);
}

label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-size: 0.92rem;
  color: var(--color-text-bright);
}

label:has(input[type="checkbox"]),
label:has(input[type="radio"]) {
  flex-direction: row;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  padding: 0.35rem 0;
}

input, textarea, select {
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-text-bright);
  background: var(--color-surface);
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-2);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input {
  min-height: 48px;
}

textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.5;
}

input:focus, textarea:focus, select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.25);
}

input[type="checkbox"],
input[type="radio"] {
  min-height: 20px;
  width: 20px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

/* Terminal Buttons */
button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  min-height: 48px;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Primary Button (Emerald / Cyan) */
button:not(.btn-secondary):not(.btn-danger):not(.btn-amber),
.btn-primary {
  background: var(--color-emerald);
  color: #04100d;
  border-color: var(--color-emerald);
  box-shadow: 0 2px 10px rgba(52, 211, 153, 0.2);
}

button:not(.btn-secondary):not(.btn-danger):not(.btn-amber):hover,
.btn-primary:hover {
  background: #4ade80;
  box-shadow: 0 4px 16px rgba(52, 211, 153, 0.35);
  transform: translateY(-1px);
  color: #04100d;
}

/* Secondary Button */
.btn-secondary,
button.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text-bright);
  border: 1px solid var(--color-border-bright);
}

.btn-secondary:hover,
button.btn-secondary:hover {
  background: var(--color-elevated);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Amber / Pause Button */
.btn-amber,
button.btn-amber {
  background: var(--color-amber-bg);
  color: var(--color-amber);
  border: 1px solid rgba(251, 191, 36, 0.4);
}

.btn-amber:hover,
button.btn-amber:hover {
  background: rgba(251, 191, 36, 0.25);
  border-color: var(--color-amber);
}

/* Danger / Rollback Button */
.btn-danger,
button.btn-danger {
  background: var(--color-rose-bg);
  color: var(--color-rose);
  border: 1px solid rgba(248, 113, 113, 0.4);
}

.btn-danger:hover,
button.btn-danger:hover {
  background: rgba(248, 113, 113, 0.25);
  border-color: var(--color-rose);
}

button:disabled,
button[aria-disabled="true"] {
  opacity: 0.6;
  cursor: wait;
  transform: none !important;
  box-shadow: none !important;
}

/* ==========================================================================
   Cyber-Deck Audio Player & Visualizer
   ========================================================================== */

.cyber-deck {
  background: var(--color-surface);
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-subtle);
}

.cyber-deck-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2);
  color: var(--color-muted);
  font-size: 0.85rem;
}

.deck-visualizer-container {
  background: #04080b;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
  position: relative;
  overflow: hidden;
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.deck-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.cyber-deck audio {
  width: 100%;
  min-height: 48px;
  accent-color: var(--color-accent);
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Submission Results, Alerts & Callouts
   ========================================================================== */

.submission-box {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  margin: var(--space-3) 0;
  border: 1px solid;
}

.submission-box.success {
  background: var(--color-emerald-bg);
  border-color: var(--color-emerald);
  color: #a7f3d0;
}

.submission-box.error {
  background: var(--color-rose-bg);
  border-color: var(--color-rose);
  color: #fecdd3;
}

.submission-box.alert {
  background: var(--color-amber-bg);
  border-color: var(--color-amber);
  color: #fef08a;
}

/* Hints & Artifact Lists */
.dossier-list {
  list-style: none;
  padding: 0;
  margin: var(--space-2) 0;
  display: grid;
  gap: var(--space-2);
}

.dossier-list li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.dossier-list li a {
  font-weight: 700;
}

.hint-box {
  background: rgba(14, 22, 30, 0.7);
  border-left: 3px solid var(--color-amber);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Character Counter */
.char-counter {
  font-size: 0.82rem;
  color: var(--color-muted);
  text-align: right;
  margin-top: -0.25rem;
}

.char-counter.valid {
  color: var(--color-emerald);
}

.char-counter.invalid {
  color: var(--color-rose);
}

/* ==========================================================================
   Mirror Log Viewer & Preformatted Blocks
   ========================================================================== */

pre, .log-viewer {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.5;
  background: #05090d;
  color: #94a3b8;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  overflow-x: auto;
  white-space: pre;
}

.mirror-container {
  position: relative;
}

.mirror-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-bottom: 0;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  padding: var(--space-1) var(--space-2);
  font-size: 0.85rem;
  color: var(--color-muted);
}

.mirror-container pre {
  margin-top: 0;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* ==========================================================================
   Footer & Safety Bar
   ========================================================================== */

footer {
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: var(--space-3);
  color: var(--color-muted);
  font-size: 0.85rem;
  text-align: center;
}

.footer-content {
  max-width: 48rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

/* ==========================================================================
   Media Queries & Responsive Tweaks
   ========================================================================== */

@media (max-width: 48rem) {
  .site-header {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }
  
  .brand-container {
    justify-content: space-between;
  }
  
  .site-header nav {
    justify-content: space-between;
    font-size: 0.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}