/* ============================================================
   DESIGN SYSTEM — Samriddha Basu Portfolio
   Theme: Industrial Precision × Operations Intelligence
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=IBM+Plex+Mono:wght@300;400;500;700&family=Barlow:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300&display=swap');

/* ── CSS Variables ── */
:root {
  /* Core Palette */
  --color-bg:          #0a0c0f;
  --color-bg-2:        #0f1215;
  --color-bg-3:        #141820;
  --color-surface:     #1a1f29;
  --color-surface-2:   #1f2532;
  --color-border:      rgba(255, 160, 40, 0.15);
  --color-border-bright: rgba(255, 160, 40, 0.45);

  /* Accent — Amber/Safety Orange */
  --color-accent:      #ff9f1c;
  --color-accent-2:    #ff6b35;
  --color-accent-dim:  rgba(255, 159, 28, 0.12);
  --color-accent-glow: rgba(255, 159, 28, 0.35);

  /* Text */
  --color-text:        #e8eaf0;
  --color-text-2:      #9ba3b4;
  --color-text-3:      #5a6172;
  --color-text-accent: #ff9f1c;

  /* Utility */
  --color-success:     #2dce89;
  --color-info:        #5e9bff;
  --color-grid:        rgba(255, 159, 28, 0.04);

  /* Typography */
  --font-display:      'Bebas Neue', sans-serif;
  --font-body:         'Barlow', sans-serif;
  --font-mono:         'IBM Plex Mono', monospace;

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Layout */
  --container-max: 1280px;
  --nav-height:    64px;

  /* Transitions */
  --ease-snap:   cubic-bezier(0.23, 1, 0.32, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-in:     cubic-bezier(0.55, 0, 1, 0.45);
  --ease-out:    cubic-bezier(0, 0.55, 0.45, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ── Grid Texture Background ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

/* ── Container ── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  position: relative;
  z-index: 1;
}

@media (max-width: 768px) {
  .container { padding: 0 var(--space-lg); }
}
@media (max-width: 480px) {
  .container { padding: 0 var(--space-md); }
}

/* ── Section Base ── */
.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--color-accent);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: 0.03em;
  line-height: 0.95;
  color: var(--color-text);
  margin-bottom: var(--space-xl);
}

.section-title span {
  color: var(--color-accent);
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  letter-spacing: 0.04em;
  line-height: 1;
}

p { max-width: 68ch; text-align: justify; hyphens: auto; }

/* No-justify exceptions — short/mono/label/heading text */
.text-mono, .stat-readout, .section-label, .tag, .exp-location,
.cert-issuer, .cert-year, .project-type, .form-label,
.contact-item-label, .footer-link, .hero-role, .hero-badge span,
.skill-bar-name, .timeline-year, .exp-role, .exp-company,
.competency-item h4, h1, h2, h3, h4, h5, h6,
.about-fact span, .profile-header-name, .profile-header-tagline,
.section-nav-link, .nav-links a, .nav-mobile a {
  text-align: left;
  hyphens: none;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity 0.2s;
}
a:hover { opacity: 0.8; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.75rem 1.6rem;
  border: none;
  cursor: pointer;
  transition: all 0.25s var(--ease-snap);
  position: relative;
  overflow: hidden;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}
.btn-primary:hover {
  background: var(--color-accent-2);
  color: var(--color-bg);
  opacity: 1;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--color-accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-border-bright);
}
.btn-outline:hover {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  opacity: 1;
}

/* ── Cards ── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-xl);
  position: relative;
  transition: border-color 0.3s, transform 0.3s var(--ease-snap), box-shadow 0.3s;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px; height: 0;
  background: var(--color-accent);
  transition: height 0.4s var(--ease-snap);
}
.card:hover {
  border-color: var(--color-border-bright);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}
.card:hover::before { height: 100%; }

/* ── Tags / Badges ── */
.tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  background: var(--color-accent-dim);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  display: inline-block;
}

/* ── Stat Readout ── */
.stat-readout {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-2);
  letter-spacing: 0.08em;
}
.stat-value {
  font-family: var(--font-display);
  font-size: 2.8rem;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  line-height: 1;
}

/* ── Divider ── */
.divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--color-border-bright), transparent);
  margin: var(--space-2xl) 0;
}

/* ── Scroll Animations ── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease-snap), transform 0.7s var(--ease-snap);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity 0.7s var(--ease-snap), transform 0.7s var(--ease-snap);
}
.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

/* stagger delays */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }
.delay-6 { transition-delay: 0.6s; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-border-bright); border-radius: 3px; }

/* ── Selection ── */
::selection { background: var(--color-accent-glow); color: var(--color-text); }

/* ── Noise overlay ── */
.noise-overlay {
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  opacity: 0.4;
}

/* ── Utility ── */
.text-accent { color: var(--color-accent); }
.text-mono { font-family: var(--font-mono); }
.text-muted { color: var(--color-text-2); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ── Visitor Counter ── */
[data-visitor-count] {
  transition: opacity 0.4s;
  opacity: 0.4;
  font-family: var(--font-display);
  font-size: 2.8rem;
  letter-spacing: 0.04em;
  color: var(--color-info);
  line-height: 1;
}
[data-visitor-count].counter-loaded {
  opacity: 1;
}
/* Footer variant — smaller */
.footer [data-visitor-count] {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--color-text-3);
}