/*--------------------------------------------------------------
DTM Technologies — Global Design System
Prompt 1.1 deliverable: css/global.css
Every page links this file first (before components.css / animations.css).
--------------------------------------------------------------*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;700&display=swap');

/*--------------------------------------------------------------
# Custom Properties — Dark mode is the DEFAULT theme
--------------------------------------------------------------*/
:root {
  /* Brand colors */
  --color-primary: #0F2B46;      /* deep navy */
  --color-accent: #00D4AA;       /* electric teal */
  --color-secondary: #6C5CE7;    /* soft purple */

  /* Theme surfaces (dark default) */
  --color-bg: #1A1A2E;
  --color-bg-alt: #14141f;
  --color-surface: rgba(255, 255, 255, 0.06);
  --color-surface-border: rgba(255, 255, 255, 0.12);
  --color-text: #F5F7FA;
  --color-text-muted: #A9B0C3;
  --color-heading: #FFFFFF;

  /* Glassmorphism overlay tokens */
  --glass-bg: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.14);
  --glass-blur: 16px;

  /* Typography */
  --font-base: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --fw-light: 300;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-bold: 700;

  /* Spacing scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Layout */
  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;

  /* Motion */
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.2s var(--ease-standard);
  --transition-base: 0.4s var(--ease-standard);

  /* Breakpoints (referenced in comments — media queries use raw px per spec) */
  --bp-mobile: 375px;
  --bp-tablet: 768px;
  --bp-desktop: 1200px;
}

/* Light mode override — applied via .light-mode class on <html> or <body> */
.light-mode {
  --color-bg: #F0F4F8;
  --color-bg-alt: #E4EAF1;
  --color-surface: rgba(15, 43, 70, 0.04);
  --color-surface-border: rgba(15, 43, 70, 0.1);
  --color-text: #1A1A2E;
  --color-text-muted: #4A5268;
  --color-heading: #0F2B46;

  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(15, 43, 70, 0.12);
}

/*--------------------------------------------------------------
# Reset & Base
--------------------------------------------------------------*/
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-base);
  font-weight: var(--fw-regular);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--fw-bold);
  color: var(--color-heading);
  line-height: 1.2;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }

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

small, .text-small {
  font-weight: var(--fw-light);
  font-size: 0.875rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-secondary);
}

img {
  max-width: 100%;
  display: block;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* Selection color */
::selection {
  background: var(--color-accent);
  color: var(--color-primary);
}

/* Focus visibility (accessibility) */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/*--------------------------------------------------------------
# Layout — Container & Grid
--------------------------------------------------------------*/
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-sm);
  padding-right: var(--space-sm);
}

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

.grid-2 { grid-template-columns: repeat(1, 1fr); }
.grid-3 { grid-template-columns: repeat(1, 1fr); }
.grid-4 { grid-template-columns: repeat(1, 1fr); }

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1200px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/*--------------------------------------------------------------
# Glassmorphism Card
--------------------------------------------------------------*/
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
  padding: var(--space-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.glass-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 12px 40px rgba(0, 212, 170, 0.18);
}

/* Fallback for browsers without backdrop-filter support */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass-card {
    background: var(--color-bg-alt);
  }
}

/*--------------------------------------------------------------
# Buttons
--------------------------------------------------------------*/
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  font-weight: var(--fw-medium);
  font-size: 0.95rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  min-height: 44px;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-primary);
}

.btn-primary:hover {
  background: #00e8ba;
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 212, 170, 0.35);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-surface-border);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-ghost {
  background: transparent;
  color: var(--color-accent);
  padding: 0.85rem 1rem;
}

.btn-ghost:hover {
  color: var(--color-secondary);
  transform: translateX(2px);
}

/*--------------------------------------------------------------
# Responsive Breakpoints (mobile-first)
# mobile: 375px  |  tablet: 768px  |  desktop: 1200px
--------------------------------------------------------------*/
@media (min-width: 375px) {
  .container { padding-left: var(--space-md); padding-right: var(--space-md); }
}

@media (min-width: 768px) {
  body { font-size: 17px; }
}

@media (min-width: 1200px) {
  .container { padding-left: var(--space-lg); padding-right: var(--space-lg); }
}

/*--------------------------------------------------------------
# Utility Classes
--------------------------------------------------------------*/
.section { padding: var(--space-2xl) 0; }
.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-muted); }
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}