/* =============================================================
   RATHILABS — Applied Research & Technical Solutions
   Minimalist, Ultra-Fast, 100% Fluid Responsive, Zero Horizontal Scroll
   ============================================================= */

:root {
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  --bg-color: #ffffff;
  --text-color: #0f172a;
  --text-muted: #475569;
  --link-color: #0369a1;
  --link-hover: #0284c7;
  --border-color: #e2e8f0;
  --card-bg: #f8fafc;
  --card-hover-border: #cbd5e1;
  --highlight-bg: #f0fdf4;
  --highlight-border: #bbf7d0;
  --accent-bg: #f0f9ff;
  --accent-border: #bae6fd;
  --primary-btn-bg: #0f172a;
  --primary-btn-text: #ffffff;
  --primary-btn-hover: #1e293b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0b0f19;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --link-color: #38bdf8;
    --link-hover: #7dd3fc;
    --border-color: #1e293b;
    --card-bg: #111827;
    --card-hover-border: #334155;
    --highlight-bg: #064e3b22;
    --highlight-border: #05966944;
    --accent-bg: #0c4a6e22;
    --accent-border: #0284c744;
    --primary-btn-bg: #f1f5f9;
    --primary-btn-text: #0f172a;
    --primary-btn-hover: #ffffff;
  }
}

/* =============================================================
   Strict Anti-Horizontal Scroll & Box Reset
   ============================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  min-width: 0; /* Allows flex/grid children to shrink below content size */
}

html {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-system);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text-color);
  background-color: var(--bg-color);
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  position: relative;
  padding: clamp(1.25rem, 4vw, 2.5rem) clamp(0.85rem, 3vw, 1.5rem) 4.5rem clamp(0.85rem, 3vw, 1.5rem);
  -webkit-font-smoothing: antialiased;
}

/* Universal Text & Media Wrapping */
h1, h2, h3, h4, h5, h6, p, a, li, span, code, div, article, section, header, footer, main, nav {
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
  max-width: 100%;
}

img, svg, video, canvas, audio, iframe {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Container */
.text-container {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  box-sizing: border-box;
}

/* =============================================================
   Header & Navigation
   ============================================================= */
header {
  width: 100%;
  margin-bottom: clamp(2rem, 5vw, 3rem);
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.85rem;
  width: 100%;
}

.brand-title {
  font-size: clamp(1.5rem, 4.5vw, 1.85rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-color);
  text-decoration: none;
  display: inline-block;
}

.brand-subtitle {
  font-size: clamp(0.88rem, 2.5vw, 0.98rem);
  color: var(--text-muted);
  line-height: 1.45;
  margin-top: 0.15rem;
}

.top-nav {
  display: flex;
  gap: 0.6rem 1.15rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 1rem;
  font-size: clamp(0.85rem, 2.4vw, 0.92rem);
  width: 100%;
}

.top-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
  white-space: normal;
}

.top-nav a:hover {
  color: var(--link-color);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(0.82rem, 2.2vw, 0.86rem) !important;
  padding: 0.45rem 0.95rem;
  background: var(--primary-btn-bg);
  color: var(--primary-btn-text) !important;
  border-radius: 6px;
  font-weight: 600 !important;
  text-decoration: none;
  white-space: normal;
  text-align: center;
  line-height: 1.3;
  transition: background 0.15s ease;
}

.nav-cta:hover {
  background: var(--primary-btn-hover);
  color: var(--primary-btn-text) !important;
}

/* =============================================================
   Hero Section
   ============================================================= */
.hero {
  width: 100%;
  margin-bottom: clamp(2rem, 5vw, 3rem);
}

.hero h1 {
  font-size: clamp(1.55rem, 5vw, 2.15rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.025em;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.hero-lead {
  font-size: clamp(1rem, 2.8vw, 1.15rem);
  line-height: 1.65;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  gap: 0.75rem 1rem;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 1.5rem;
  width: 100%;
}

/* =============================================================
   Buttons
   ============================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(0.88rem, 2.4vw, 0.96rem);
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: 6px;
  text-decoration: none;
  text-align: center;
  transition: all 0.15s ease;
  cursor: pointer;
  box-sizing: border-box;
  max-width: 100%;
  white-space: normal;
  line-height: 1.35;
}

.btn-primary {
  background-color: var(--primary-btn-bg);
  color: var(--primary-btn-text);
  border: 1px solid var(--primary-btn-bg);
}

.btn-primary:hover {
  background-color: var(--primary-btn-hover);
  color: var(--primary-btn-text);
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  background-color: var(--card-bg);
  border-color: var(--card-hover-border);
  color: var(--text-color);
  text-decoration: none;
}

/* =============================================================
   Headings & Typography
   ============================================================= */
h2 {
  font-size: clamp(1.25rem, 4vw, 1.45rem);
  font-weight: 750;
  letter-spacing: -0.015em;
  margin: clamp(2rem, 5vw, 2.75rem) 0 0.5rem 0;
  color: var(--text-color);
  line-height: 1.3;
}

.section-subtitle {
  font-size: clamp(0.92rem, 2.5vw, 1.02rem);
  color: var(--text-muted);
  margin-bottom: 1.35rem;
  line-height: 1.55;
}

h3 {
  font-size: clamp(1.05rem, 3.2vw, 1.18rem);
  font-weight: 700;
  margin: 1.15rem 0 0.35rem 0;
  color: var(--text-color);
  line-height: 1.35;
}

p {
  margin-bottom: 1.15rem;
}

a {
  color: var(--link-color);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

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

/* =============================================================
   Cards & Grids
   ============================================================= */
.cards-grid {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  margin: 1.25rem 0 1.85rem 0;
  width: 100%;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: clamp(1rem, 3vw, 1.5rem);
  transition: border-color 0.15s ease;
  box-sizing: border-box;
  width: 100%;
}

.card:hover {
  border-color: var(--card-hover-border);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  margin-bottom: 0.5rem;
  width: 100%;
}

.card-header h3 {
  margin: 0;
  font-size: clamp(1.05rem, 3.2vw, 1.15rem);
  flex: 1 1 200px;
}

.card-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.18rem 0.5rem;
  border-radius: 4px;
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  color: var(--link-color);
  align-self: flex-start;
  white-space: normal;
}

.card p {
  font-size: clamp(0.92rem, 2.5vw, 0.98rem);
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.card ul {
  margin: 0 0 0.75rem clamp(1rem, 3vw, 1.25rem);
  font-size: clamp(0.9rem, 2.4vw, 0.95rem);
  color: var(--text-color);
}

.card ul li {
  margin-bottom: 0.35rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.85rem;
  width: 100%;
}

.tag {
  font-family: var(--font-mono);
  font-size: clamp(0.7rem, 2vw, 0.75rem);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  max-width: 100%;
}

/* Callout Box */
.callout-box {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--link-color);
  border-radius: 0 8px 8px 0;
  padding: clamp(1rem, 3vw, 1.35rem);
  margin: 1.35rem 0;
  width: 100%;
  box-sizing: border-box;
}

.callout-box p:last-child {
  margin-bottom: 0;
}

/* =============================================================
   Contact / Project Inquiry Box
   ============================================================= */
.project-cta {
  background-color: var(--accent-bg);
  border: 1px solid var(--accent-border);
  border-radius: 10px;
  padding: clamp(1.25rem, 4vw, 2rem);
  margin: 2.25rem 0;
  width: 100%;
  box-sizing: border-box;
}

.project-cta h2 {
  margin-top: 0;
  font-size: clamp(1.25rem, 4vw, 1.5rem);
}

.cta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 1.15rem;
  margin-top: 1.35rem;
  width: 100%;
}

.cta-col {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: clamp(1rem, 3vw, 1.35rem);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-sizing: border-box;
  width: 100%;
}

.cta-col h4 {
  font-size: clamp(0.98rem, 2.8vw, 1.05rem);
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--text-color);
}

.cta-col p {
  font-size: clamp(0.88rem, 2.4vw, 0.92rem);
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

.cta-col .btn {
  width: 100%;
  font-size: 0.9rem;
}

.email-direct {
  margin-top: 1.35rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--accent-border);
  font-size: clamp(0.88rem, 2.4vw, 0.95rem);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  width: 100%;
}

.email-direct code {
  font-family: var(--font-mono);
  font-size: clamp(0.82rem, 2.4vw, 0.92rem);
  background-color: var(--bg-color);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-all;
  display: inline-block;
}

.email-direct-note {
  font-size: clamp(0.8rem, 2.2vw, 0.88rem);
  color: var(--text-muted);
}

/* =============================================================
   Lists & Dividers
   ============================================================= */
ul {
  margin: 0 0 1.25rem clamp(1rem, 3vw, 1.5rem);
  padding: 0;
  max-width: 100%;
}

li {
  margin-bottom: 0.45rem;
}

hr {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: clamp(2rem, 5vw, 2.75rem) 0;
  width: 100%;
}

/* =============================================================
   Jobs (Low-Key / Understated)
   ============================================================= */
.jobs-subtle {
  margin-top: 2rem;
  padding: 1.25rem 0 0 0;
  border-top: 1px solid var(--border-color);
}

.jobs-subtle h3 {
  font-size: 0.92rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin: 0 0 0.35rem 0;
}

.jobs-subtle p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 0;
}

/* =============================================================
   Footer
   ============================================================= */
footer {
  width: 100%;
  margin-top: clamp(2.5rem, 6vw, 3.5rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  font-size: clamp(0.82rem, 2.2vw, 0.88rem);
  color: var(--text-muted);
}

.footer-nav {
  display: flex;
  gap: 0.5rem 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
  width: 100%;
}

.footer-nav a {
  color: var(--text-muted);
  white-space: normal;
}

.footer-nav a:hover {
  color: var(--link-color);
}

.footer-sub {
  margin-top: 0.75rem;
  font-size: clamp(0.78rem, 2vw, 0.82rem);
  color: var(--text-muted);
}

/* =============================================================
   Responsive Breakpoint: Mobile Touch & Stacking (< 640px)
   ============================================================= */
@media (max-width: 640px) {
  .header-top {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .nav-cta {
    width: 100%;
    padding: 0.55rem 1rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
    padding: 0.75rem 1rem;
  }

  .email-direct {
    flex-direction: column;
    align-items: flex-start;
  }
}