/* ==========================================================================
   BIKRANT DAHAL - CYBERSECURITY & SOC OPERATIONS PORTFOLIO
   Base Stylesheet & Layout System
   ========================================================================== */

:root {
  /* Color Palette - Cyber Dark (Default) */
  --bg-primary: #060911;
  --bg-secondary: #0c1222;
  --bg-tertiary: #111a30;
  --bg-card: rgba(13, 20, 38, 0.75);
  --bg-card-hover: rgba(18, 28, 52, 0.9);
  --bg-glass: rgba(10, 16, 32, 0.65);
  --border-subtle: rgba(59, 130, 246, 0.15);
  --border-focus: #00f0ff;
  --border-highlight: rgba(0, 240, 255, 0.35);

  /* Accents & Neon */
  --cyan: #00f0ff;
  --cyan-glow: rgba(0, 240, 255, 0.4);
  --green: #00ff9d;
  --green-glow: rgba(0, 255, 157, 0.4);
  --blue: #3b82f6;
  --blue-hover: #2563eb;
  --purple: #a855f7;
  --amber: #f59e0b;
  --red: #ef4444;

  /* Typography */
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', var(--font-sans);
  --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Consolas, Monaco, monospace;

  /* UI Metrics */
  --header-height: 72px;
  --hud-height: 36px;
  --container-max: 1240px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-card: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.18);
}

/* Light Theme Switch */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-glass: rgba(255, 255, 255, 0.75);
  --border-subtle: rgba(15, 23, 42, 0.12);
  --border-focus: #0284c7;
  --border-highlight: rgba(2, 132, 199, 0.4);

  --cyan: #0284c7;
  --cyan-glow: rgba(2, 132, 199, 0.2);
  --green: #059669;
  --green-glow: rgba(5, 150, 105, 0.2);
  --blue: #2563eb;
  --blue-hover: #1d4ed8;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 20px rgba(2, 132, 199, 0.1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--hud-height) + 16px);
  color-scheme: dark;
}

[data-theme="light"] html {
  color-scheme: light;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Canvas Layer */
#telemetry-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
  transition: opacity 0.5s;
}

[data-theme="light"] #telemetry-canvas {
  opacity: 0.25;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Typography Helpers */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.mono {
  font-family: var(--font-mono);
}

.text-gradient {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--green) 50%, var(--blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-cyan { color: var(--cyan); }
.text-green { color: var(--green); }
.text-blue { color: var(--blue); }
.text-amber { color: var(--amber); }
.text-red { color: var(--red); }
.text-muted { color: var(--text-muted); }

/* Common Section Layout */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--border-highlight);
  color: var(--cyan);
  margin-bottom: 16px;
}

.section-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Buttons & Interactive Elements */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.15) 0%, rgba(59, 130, 246, 0.25) 100%);
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.15);
}

.btn-primary:hover {
  background: var(--cyan);
  color: #060911;
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.5);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--bg-card);
  border-color: var(--border-subtle);
  color: var(--text-main);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Cards & Glass Containers */
.cyber-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.cyber-card:hover {
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-glow), var(--shadow-card);
  transform: translateY(-4px);
}

/* Animations */
@keyframes pulseGlow {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 0.9; transform: scale(1.05); }
}

@keyframes radarSweep {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes scanline {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(1000%); }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.fade-in-element {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in-element.is-visible {
  opacity: 1;
  transform: translateY(0);
}