/* ========================================================================
   Variables
   ======================================================================== */

:root {
  /* Color Palette */
  --color-background: #050816; /* deep midnight navy */
  --color-surface: #0b1020;
  --color-surface-alt: #11182a;
  --color-text: #f7fafc; /* clean white */
  --color-text-muted: #a0aec0; /* cool gray */
  --color-primary: #00e5ff; /* electric cyan */
  --color-primary-soft: rgba(0, 229, 255, 0.08);
  --color-accent: #7dfc4f; /* luminous green */
  --color-success: #22c55e;
  --color-warning: #facc15;
  --color-danger: #f97373;

  /* Neutral Grays */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2933;
  --gray-900: #111827;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "Fira Code", "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Font Sizes (clamp for responsiveness) */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: clamp(1.875rem, 2vw + 1.25rem, 2.25rem);
  --text-4xl: clamp(2.25rem, 3vw + 1.5rem, 3rem);
  --text-5xl: clamp(3rem, 4vw + 1.75rem, 3.75rem);

  /* Line Heights */
  --leading-tight: 1.2;
  --leading-snug: 1.35;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;

  /* Spacing Scale (0–96px) */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* Radius */
  --radius-xs: 0.125rem;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows (subtle, data-driven depth) */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 18px 45px rgba(0, 0, 0, 0.45);
  --shadow-glow-cyan: 0 0 24px rgba(0, 229, 255, 0.35);
  --shadow-glow-green: 0 0 24px rgba(125, 252, 79, 0.35);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-base: 200ms ease-out;
  --transition-slow: 320ms ease-out;
}

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
    --transition-slow: 0ms;
  }

  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ========================================================================
   Reset / Normalize
   ======================================================================== */

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

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

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

button {
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
}

ul, ol {
  list-style: none;
  padding: 0;
}

/* ========================================================================
   Base Styles
   ======================================================================== */

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  background: radial-gradient(circle at top left, rgba(0, 229, 255, 0.08), transparent 55%),
              radial-gradient(circle at bottom right, rgba(125, 252, 79, 0.06), transparent 50%),
              var(--color-background);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  display: block;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--leading-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-5xl);
  letter-spacing: 0.03em;
}

h2 {
  font-size: var(--text-4xl);
}

h3 {
  font-size: var(--text-3xl);
}

h4 {
  font-size: var(--text-2xl);
}

h5 {
  font-size: var(--text-xl);
}

h6 {
  font-size: var(--text-lg);
}

h1, h2, h3 {
  margin-bottom: var(--space-4);
}

h4, h5, h6 {
  margin-bottom: var(--space-3);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-base), text-shadow var(--transition-base);
}

a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15em;
  width: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width var(--transition-base);
}

a:hover::after,
 a:focus-visible::after {
  width: 100%;
}

a:hover {
  color: var(--color-accent);
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
}

strong, b {
  font-weight: 600;
  color: var(--color-text);
}

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

pre {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: #050816;
  color: var(--color-primary);
  overflow-x: auto;
}

hr {
  border: 0;
  border-top: 1px solid rgba(148, 163, 184, 0.25);
  margin: var(--space-8) 0;
}

/* ========================================================================
   Accessibility & Focus Styles
   ======================================================================== */

:focus:not(:focus-visible) {
  outline: none;
}

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

@media (prefers-contrast: more) {
  :focus-visible {
    outline-width: 3px;
  }
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================================================
   Utilities
   ======================================================================== */

/* Layout container */
.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
  max-width: 1200px;
}

@media (min-width: 1440px) {
  .container {
    max-width: 1320px;
  }
}

.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

/* Flex helpers */
.flex {
  display: flex;
}

.inline-flex {
  display: inline-flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-column {
  display: flex;
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

/* Grid helpers */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-8);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-8);
}

@media (max-width: 900px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Spacing utilities (y-axis) */
.stack-xs > * + * {
  margin-top: var(--space-2);
}

.stack-sm > * + * {
  margin-top: var(--space-3);
}

.stack-md > * + * {
  margin-top: var(--space-4);
}

.stack-lg > * + * {
  margin-top: var(--space-6);
}

.stack-xl > * + * {
  margin-top: var(--space-8);
}

/* Data-visual emphasis text */
.accent-text {
  color: var(--color-primary);
}

.muted-text {
  color: var(--color-text-muted);
}

/* ========================================================================
   Components
   ======================================================================== */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #050816;
  box-shadow: var(--shadow-md), var(--shadow-glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg), var(--shadow-glow-green);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: rgba(148, 163, 184, 0.5);
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.6);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  background: rgba(15, 23, 42, 0.95);
  box-shadow: var(--shadow-sm), var(--shadow-glow-cyan);
}

.btn-ghost {
  background: rgba(15, 23, 42, 0.8);
  color: var(--color-text);
}

.btn-ghost:hover {
  background: rgba(15, 23, 42, 1);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Inputs & Textareas */
.input,
.textarea,
.select {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.85);
  color: var(--color-text);
  font-size: var(--text-sm);
  line-height: 1.4;
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-muted);
}

.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.5), var(--shadow-glow-cyan);
  background: rgba(15, 23, 42, 1);
  outline: none;
}

.input:disabled,
.textarea:disabled,
.select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

label {
  display: inline-block;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text);
}

.field-description {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.field-error {
  font-size: var(--text-xs);
  color: var(--color-danger);
  margin-top: var(--space-1);
}

/* Card */
.card {
  position: relative;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at top left, rgba(0, 229, 255, 0.06), transparent 55%),
              radial-gradient(circle at bottom right, rgba(125, 252, 79, 0.04), transparent 55%),
              var(--color-surface);
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at top right, rgba(0, 229, 255, 0.08), transparent 55%);
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.card:hover::before {
  opacity: 1;
}

.card-header {
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.card-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.card-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.card-metric {
  min-width: 6rem;
}

.card-metric-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.card-metric-value {
  font-size: var(--text-lg);
  font-weight: 600;
}

/* Data chip / tag */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid rgba(148, 163, 184, 0.5);
  color: var(--color-text-muted);
  background: rgba(15, 23, 42, 0.9);
}

.badge-accent {
  border-color: rgba(0, 229, 255, 0.6);
  color: var(--color-primary);
  background: rgba(0, 229, 255, 0.08);
}

/* Data panel / dashboard-like container */
.data-panel {
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.98));
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: var(--shadow-md);
}

.data-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
}

.data-panel-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4);
}

@media (max-width: 900px) {
  .data-panel-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Simple metric block for dashboards */
.metric {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.3);
}

.metric-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 0.4rem;
}

.metric-value {
  font-size: var(--text-2xl);
  font-weight: 600;
}

.metric-trend-positive {
  color: var(--color-success);
}

.metric-trend-negative {
  color: var(--color-danger);
}

/* Tables (for data views) */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table thead {
  background: rgba(15, 23, 42, 0.98);
}

.table th,
.table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
}

.table th {
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: var(--text-xs);
}

.table tbody tr:hover {
  background: rgba(15, 23, 42, 0.9);
}

/* ========================================================================
   End
   ======================================================================== */