/* ========================================================================
   Variables
   ======================================================================== */
:root {
  /* Color Palette - CIKABOU Energy Corporate */
  --color-background: #050b15; /* deep navy for immersive backdrop */
  --color-surface: #0b1424;    /* slightly lighter for cards/sections */
  --color-surface-alt: #101a2b;
  --color-text: #f5f7fb;       /* near-white for high contrast */
  --color-text-muted: #a5b0c7;

  --color-primary: #1f74ff;    /* electric blue accent */
  --color-primary-soft: rgba(31, 116, 255, 0.12);
  --color-success: #1dbf73;
  --color-warning: #f7b500;
  --color-danger: #ff4d4f;

  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #111827;
  --color-gray-900: #020617;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-md: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem;  /* 36px */
  --font-size-5xl: 3rem;     /* 48px */

  --line-height-tight: 1.1;
  --line-height-snug: 1.3;
  --line-height-normal: 1.5;
  --line-height-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 */

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-pill: 999px;

  /* Shadows - subtle, technical feel */
  --shadow-sm: 0 6px 18px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 14px 45px rgba(0, 0, 0, 0.35);
  --shadow-soft-glow: 0 0 0 1px rgba(31, 116, 255, 0.18), 0 18px 45px rgba(0, 0, 0, 0.55);

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

  /* Layout */
  --container-max-width: 1200px;
  --container-padding-inline: 1.5rem;
}

@media (max-width: 768px) {
  :root {
    --font-size-3xl: 1.75rem;
    --font-size-4xl: 2rem;
    --font-size-5xl: 2.5rem;
    --container-padding-inline: 1.25rem;
  }
}

/* ========================================================================
   Reset / Normalize
   ======================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
  padding: 0;
}

body {
  min-height: 100vh;
}

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

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

button {
  border: none;
  padding: 0;
  background: none;
  color: inherit;
}

textarea {
  resize: vertical;
}

/* Remove default link underlines; will manage in base styles */
a {
  text-decoration: none;
  color: inherit;
}

/* ========================================================================
   Base Styles
   ======================================================================== */
body {
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  background-color: var(--color-background);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  min-height: 60vh;
}

/* Headings - modern, slightly condensed spacing for technical feel */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: var(--line-height-snug);
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-5xl);
  letter-spacing: 0.01em;
  margin-bottom: var(--space-4);
}

h2 {
  font-size: var(--font-size-4xl);
  letter-spacing: 0.01em;
  margin-bottom: var(--space-3);
}

h3 {
  font-size: var(--font-size-3xl);
  letter-spacing: 0.01em;
  margin-bottom: var(--space-3);
}

h4 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-2);
}

h5 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

h6 {
  font-size: var(--font-size-lg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-3);
  color: var(--color-text-muted);
}

strong,
b {
  font-weight: 600;
}

small {
  font-size: var(--font-size-sm);
}

/* Links - accent color, understated until hover */
a {
  color: var(--color-primary);
  text-decoration-thickness: 0.06em;
  text-underline-offset: 0.15em;
  transition: color var(--transition-normal),
              text-decoration-color var(--transition-normal),
              opacity var(--transition-fast);
}

a:hover {

  text-decoration-color: rgba(255, 255, 255, 0.5);
}

a:active {
  opacity: 0.75;
}

/* Lists */
ul,
ol {
  padding-left: 1.25rem;
  margin-bottom: var(--space-3);
}

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

/* Layout: container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--container-padding-inline);
}

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

.section--tight {
  padding-block: var(--space-10);
}

/* 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;
}

.gap-xs {
  gap: var(--space-2);
}

.gap-sm {
  gap: var(--space-3);
}

.gap-md {
  gap: var(--space-4);
}

.gap-lg {
  gap: var(--space-6);
}

/* Simple grid */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

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

/* Spacing utilities (margin-bottom only for content rhythm) */
.mb-0 { margin-bottom: 0 !important; }
.mb-xs { margin-bottom: var(--space-2) !important; }
.mb-sm { margin-bottom: var(--space-3) !important; }
.mb-md { margin-bottom: var(--space-4) !important; }
.mb-lg { margin-bottom: var(--space-6) !important; }
.mb-xl { margin-bottom: var(--space-10) !important; }

/* Text utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-uppercase { text-transform: uppercase; letter-spacing: 0.08em; }

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

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

/* Buttons */
.button,
button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  --btn-bg: var(--color-primary);
  --btn-bg-hover: #3c8bff;
  --btn-bg-active: #1656c2;
  --btn-color: #ffffff;
  --btn-border: transparent;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding-inline: 1.5rem;
  padding-block: 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-color);
  font-weight: 500;
  font-size: var(--font-size-sm);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition-normal),
              color var(--transition-normal),
              border-color var(--transition-normal),
              box-shadow var(--transition-normal),
              transform var(--transition-fast);
}

.button--ghost {
  --btn-bg: transparent;
  --btn-bg-hover: rgba(255, 255, 255, 0.04);
  --btn-bg-active: rgba(255, 255, 255, 0.06);
  --btn-border: rgba(255, 255, 255, 0.16);
  --btn-color: var(--color-text);
}

.button--secondary {
  --btn-bg: var(--color-surface-alt);
  --btn-bg-hover: #172036;
  --btn-bg-active: #0d1626;
  --btn-border: rgba(255, 255, 255, 0.08);
  --btn-color: var(--color-text);
}

.button:hover,
button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
  background-color: var(--btn-bg-hover);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.04), 0 12px 30px rgba(0, 0, 0, 0.45);
  transform: translateY(-1px);
}

.button:active,
button:active,
input[type="button"]:active,
input[type="submit"]:active,
input[type="reset"]:active {
  background-color: var(--btn-bg-active);
  box-shadow: none;
  transform: translateY(0);
}

.button:disabled,
button:disabled,
input[type="button"]:disabled,
input[type="submit"]:disabled,
input[type="reset"]:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
}

/* Form inputs */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
input[type="password"],
input[type="search"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding-inline: 0.9rem;
  padding-block: 0.7rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.16);
  background-color: rgba(8, 15, 30, 0.85);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: 1.4;
  transition: border-color var(--transition-normal),
              box-shadow var(--transition-normal),
              background-color var(--transition-normal);
}

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

input:focus,
select:focus,
textarea:focus {
  border-color: rgba(31, 116, 255, 0.7);
  box-shadow: 0 0 0 1px rgba(31, 116, 255, 0.55);
  outline: none;
}

fieldset {
  border: none;
  padding: 0;
  margin: 0;
}

label {
  display: inline-block;
  margin-bottom: 0.35rem;
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

/* Card - for trading / infrastructure content blocks */
.card {
  background: radial-gradient(circle at top left, rgba(31, 116, 255, 0.16), transparent 55%), var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.card--minimal {
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-sm);
}

.card__title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.card__subtitle {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

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

/* ========================================================================
   Accessibility & Motion
   ======================================================================== */

/* Focus styles - visible, high contrast ring */
:where(a, button, input, textarea, select, [tabindex]:not([tabindex="-1"])):focus-visible {
  outline: 2px solid rgba(31, 116, 255, 0.95);
  outline-offset: 2px;
  box-shadow: 0 0 0 1px rgba(31, 116, 255, 0.6);
}

:where(a, button, input, textarea, select, [tabindex]:not([tabindex="-1"])):focus {
  outline: none;
}

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}