/* ==============================================================================
   GAURAV KALE PORTFOLIO - DESIGN SYSTEM TOKENS & BASE STYLES
   ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
  /* Dark Mode Default Theme (Obsidian & Technical Slate) */
  --bg-primary: #080c14;
  --bg-secondary: #0d1320;
  --bg-tertiary: #131b2e;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(22, 33, 58, 0.85);
  --bg-glass: rgba(13, 19, 32, 0.7);
  --bg-elevated: #1a243b;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-bright: #ffffff;

  --border-subtle: rgba(148, 163, 184, 0.12);
  --border-strong: rgba(148, 163, 184, 0.25);
  --border-glow: rgba(0, 240, 255, 0.35);

  /* Curated Dual-Tone Accents: AI Cyan & Hardware Amber-Copper */
  --accent-cyan: #00f0ff;
  --accent-cyan-rgb: 0, 240, 255;
  --accent-amber: #f59e0b;
  --accent-amber-rgb: 245, 158, 11;
  --accent-emerald: #10b981;
  --accent-indigo: #6366f1;

  --primary-accent: var(--accent-cyan);
  --secondary-accent: var(--accent-amber);

  /* Shadows & Glows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow-cyan: 0 0 25px rgba(0, 240, 255, 0.2);
  --shadow-glow-amber: 0 0 25px rgba(245, 158, 11, 0.2);

  /* Fonts */
  --font-display: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Layout */
  --container-max: 1280px;
  --nav-height: 72px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Mode Overrides */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --bg-glass: rgba(248, 250, 252, 0.85);
  --bg-elevated: #ffffff;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-bright: #020617;

  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.16);
  --border-glow: rgba(2, 132, 199, 0.4);

  --accent-cyan: #0284c7;
  --accent-cyan-rgb: 2, 132, 199;
  --accent-amber: #d97706;
  --accent-amber-rgb: 217, 119, 6;
  --accent-emerald: #059669;

  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);
  --shadow-glow-cyan: 0 0 25px rgba(2, 132, 199, 0.15);
  --shadow-glow-amber: 0 0 25px rgba(217, 119, 6, 0.15);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 24px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  position: relative;
}

/* Accessible Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--accent-cyan);
  color: #080c14;
  font-weight: 700;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 9999;
  transition: top var(--transition-fast);
  text-decoration: none;
}
.skip-link:focus {
  top: 1rem;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

@media (min-width: 768px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); font-weight: 800; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.2vw, 1.65rem); }
h4 { font-size: 1.15rem; }

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

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

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

/* Section Header Utility */
.section-header {
  margin-bottom: 3rem;
  text-align: left;
}
.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
  padding: 0.3rem 0.8rem;
  background: rgba(var(--accent-cyan-rgb), 0.08);
  border: 1px solid rgba(var(--accent-cyan-rgb), 0.2);
  border-radius: var(--radius-full);
}
.section-eyebrow.amber {
  color: var(--accent-amber);
  background: rgba(var(--accent-amber-rgb), 0.08);
  border-color: rgba(var(--accent-amber-rgb), 0.2);
}
.section-title {
  margin-bottom: 0.75rem;
}
.section-desc {
  max-width: 680px;
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* Standard Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.4rem;
  font-family: var(--font-display);
  font-size: 0.925rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  line-height: 1;
}

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

.btn-primary {
  background: var(--accent-cyan);
  color: #080c14;
  font-weight: 700;
  box-shadow: 0 4px 18px rgba(var(--accent-cyan-rgb), 0.3);
}
.btn-primary:hover {
  background: #22f3ff;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(var(--accent-cyan-rgb), 0.45);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-bright);
  border-color: var(--border-strong);
}
.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-amber {
  background: var(--accent-amber);
  color: #080c14;
  font-weight: 700;
  box-shadow: 0 4px 18px rgba(var(--accent-amber-rgb), 0.3);
}
.btn-amber:hover {
  background: #fbbf24;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(var(--accent-amber-rgb), 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--text-bright);
  border-color: var(--border-subtle);
}
.btn-outline:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(var(--accent-cyan-rgb), 0.05);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.825rem;
  border-radius: var(--radius-sm);
}

/* Badge Tags & Chips */
.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}
.tag-chip:hover {
  border-color: var(--accent-cyan);
  color: var(--text-bright);
}

/* Status Pill */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: currentColor;
  box-shadow: 0 0 8px currentColor;
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

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