/* ================================================================
   RamanaAI.com — Design System
   Enterprise AI Platform Leader
   ================================================================ */

/* ---- Google Fonts are loaded per-page ---- */

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

/* ---- Design Tokens ---- */
:root {
  --bg:          #0B1220;
  --bg-card:     #111827;
  --bg-card-2:   #0f1a2e;
  --bg-subtle:   #161f33;
  --accent:      #2563EB;
  --accent-2:    #38BDF8;
  --accent-glow: rgba(37,99,235,0.18);
  --text:        #FFFFFF;
  --text-2:      #CBD5E1;
  --text-3:      #94A3B8;
  --text-4:      #64748B;
  --border:      rgba(255,255,255,0.07);
  --border-2:    rgba(37,99,235,0.25);
  --radius:      12px;
  --radius-lg:   18px;
  --shadow:      0 4px 32px rgba(0,0,0,0.45);
  --shadow-lg:   0 12px 48px rgba(0,0,0,0.5);
  --t:           0.22s ease;
  --max-w:       1100px;
  --font:        'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ---- Base ---- */
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a.skip-link {
  position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden;
}
a.skip-link:focus {
  left: 1rem; top: 1rem; width: auto; height: auto; padding: 0.5rem 0.8rem; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: 6px; z-index: 9999; color: var(--text-2);
}
a { color: var(--accent-2); text-decoration: none; transition: color var(--t); }
a:hover { color: #fff; }
ul { list-style: none; }
::selection { background: var(--accent); color: #fff; }

/* ---- Typography ---- */
h1, h2, h3, h4, h5 {
  color: var(--text);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.025em;
}
h1 { font-size: clamp(2.1rem, 5.5vw, 3.8rem); }
h2 { font-size: clamp(1.55rem, 3.2vw, 2.35rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; }
p  { color: var(--text-2); line-height: 1.75; }

/* ---- Layout ---- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; }
.section    { padding: 6rem 0; }
.section-sm { padding: 4rem 0; }

.section-label {
  display: inline-block;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.13em;
  text-transform: uppercase; color: var(--accent-2);
  margin-bottom: 1rem;
}
.section-title  { margin-bottom: 1rem; }
.section-desc   { max-width: 600px; margin-bottom: 3rem; }

/* ---- Navigation ---- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  padding: 1rem 0;
  background: rgba(11,18,32,0.85);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border-bottom: 1px solid var(--border);
  transition: background var(--t);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 2rem;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem;
}
.nav-brand {
  font-size: 1.15rem; font-weight: 800; color: var(--text);
  letter-spacing: -0.03em; white-space: nowrap;
}
.nav-brand span { color: var(--accent-2); }
.nav-links {
  display: flex; align-items: center; gap: 0.25rem;
}
.nav-links a {
  font-size: 0.875rem; font-weight: 500; color: var(--text-3);
  padding: 0.4rem 0.75rem; border-radius: 6px;
  transition: color var(--t), background var(--t);
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: rgba(255,255,255,0.06); }
.nav-badge {
  font-size: 0.58rem; font-weight: 700; letter-spacing: 0.08em;
  background: var(--accent); color: #fff;
  padding: 0.15em 0.5em; border-radius: 20px;
  vertical-align: 1px; text-transform: uppercase; margin-left: 0.2rem;
}
.nav-cta {
  background: var(--accent) !important; color: #fff !important;
  padding: 0.45rem 1.1rem !important; border-radius: 7px !important;
  font-weight: 600 !important;
}
.nav-cta:hover { background: #1d4ed8 !important; color: #fff !important; }
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  padding: 0.4rem; color: var(--text); flex-shrink: 0;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.72em 1.8em; border-radius: 8px;
  font-weight: 600; font-size: 0.9rem; cursor: pointer;
  border: 1.5px solid transparent;
  transition: all var(--t); text-decoration: none; white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: #1d4ed8; border-color: #1d4ed8; color: #fff; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(37,99,235,0.4); }
.btn-outline { background: transparent; color: var(--text-2); border-color: var(--border); }
.btn-outline:hover { color: var(--text); border-color: rgba(255,255,255,0.3); transform: translateY(-2px); }
.btn-ghost  { background: rgba(37,99,235,0.1); color: var(--accent-2); border-color: rgba(37,99,235,0.2); }
.btn-ghost:hover { background: rgba(37,99,235,0.18); color: var(--accent-2); transform: translateY(-2px); }
.btn-sm { padding: 0.45em 1.1em; font-size: 0.82rem; }
.btn-lg { padding: 0.85em 2.1em; font-size: 1rem; }

/* ---- Cards ---- */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem;
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  box-shadow: 0 8px 32px rgba(37,99,235,0.1);
}

/* ---- Grids ---- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.grid-6 { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1.5rem; }

/* ---- Tags / Pills ---- */
.tags { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1rem; }
.tag {
  font-size: 0.72rem; font-weight: 500;
  padding: 0.25em 0.75em; border-radius: 20px;
  background: rgba(56,189,248,0.08); color: var(--accent-2);
  border: 1px solid rgba(56,189,248,0.18);
}
.tag-blue  { background: rgba(37,99,235,0.1);  color: #93c5fd; border-color: rgba(37,99,235,0.2); }
.tag-green { background: rgba(16,185,129,0.1); color: #6ee7b7; border-color: rgba(16,185,129,0.2); }
.tag-gray  { background: rgba(255,255,255,0.05); color: var(--text-3); border-color: var(--border); }

/* ---- Divider ---- */
.divider { height: 1px; background: var(--border); margin: 2.5rem 0; }

/* ---- Fade-in Animation ---- */
.fade-in {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ================================================================
   HERO
   ================================================================ */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  padding-top: 70px; position: relative; overflow: hidden;
}
/* Dot-grid background pattern */
.hero::before {
  content: '';
  position: absolute; inset: 0; z-index: 0;
  background-image:
    radial-gradient(ellipse 70% 55% at 50% -5%, rgba(37,99,235,0.22) 0%, transparent 65%),
    radial-gradient(circle at 1px 1px, rgba(255,255,255,0.05) 1px, transparent 0);
  background-size: 100% 100%, 32px 32px;
}
/* Bottom fade */
.hero::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0; height: 140px; z-index: 0;
  background: linear-gradient(to top, var(--bg), transparent);
}
.hero .container { position: relative; z-index: 1; }

.hero-label {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.74rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent-2);
  background: rgba(56,189,248,0.08); border: 1px solid rgba(56,189,248,0.2);
  padding: 0.4em 1em; border-radius: 20px; margin-bottom: 2rem;
}
.hero-label-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent-2);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; } 50% { opacity: 0.3; }
}
.hero h1 { margin-bottom: 0.8rem; }
.hero h1 em { font-style: normal; color: var(--accent-2); }
.hero-name {
  font-size: 1.05rem; font-weight: 600; color: var(--text-2);
  margin-bottom: 1rem; letter-spacing: -0.01em;
}
.hero-spec-tags {
  display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 2rem;
}
.hero-spec-tag {
  font-size: 0.78rem; color: var(--text-3);
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  padding: 0.3em 0.9em; border-radius: 20px;
}
.hero-desc {
  font-size: 1.08rem; color: var(--text-2);
  max-width: 660px; margin-bottom: 2.5rem; line-height: 1.85;
}
.hero-btns { display: flex; flex-wrap: wrap; gap: 0.9rem; }

/* ================================================================
   STATS BAND
   ================================================================ */
.stats-band {
  padding: 3.5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-card-2);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 2rem; text-align: center;
}
.stat-num {
  font-size: 2.1rem; font-weight: 800; color: var(--accent-2);
  line-height: 1; letter-spacing: -0.03em;
}
.stat-lbl {
  font-size: 0.72rem; color: var(--text-3); margin-top: 0.5rem;
  line-height: 1.35; text-transform: uppercase; letter-spacing: 0.05em;
}

/* ================================================================
   FEATURE CARDS (What I Build)
   ================================================================ */
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem 1.8rem;
  transition: all var(--t);
}
.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-2);
  box-shadow: 0 10px 36px rgba(37,99,235,0.12);
}
.feature-icon {
  width: 46px; height: 46px;
  background: rgba(37,99,235,0.12); border: 1px solid rgba(37,99,235,0.2);
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.2rem;
}
.feature-icon svg { width: 22px; height: 22px; stroke: var(--accent-2); fill: none; stroke-width: 1.8; }
.feature-card h3 { font-size: 1.05rem; margin-bottom: 0.5rem; }
.feature-card p  { font-size: 0.88rem; color: var(--text-3); }

/* ================================================================
   PROJECT CARDS (Enterprise AI programs)
   ================================================================ */
.project-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.8rem;
  transition: all var(--t); position: relative; overflow: hidden;
}
.project-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0; transition: opacity var(--t);
}
.project-card:hover { transform: translateY(-4px); border-color: var(--border-2); }
.project-card:hover::before { opacity: 1; }
.project-org {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--accent-2); margin-bottom: 0.35rem;
}
.project-card h3 { font-size: 1.1rem; margin-bottom: 0.7rem; }

/* ================================================================
   JOURNEY TIMELINE
   ================================================================ */
.journey-flow {
  display: flex; flex-wrap: wrap; gap: 0; align-items: center;
  justify-content: center;
}
.journey-step {
  display: flex; align-items: center; gap: 0.5rem;
}
.journey-node {
  background: var(--bg-card); border: 1px solid var(--border-2);
  color: var(--text-2); font-size: 0.82rem; font-weight: 600;
  padding: 0.5em 1.1em; border-radius: 8px; white-space: nowrap;
  transition: all var(--t);
}
.journey-node:hover { border-color: var(--accent-2); color: var(--accent-2); }
.journey-node.current { background: rgba(37,99,235,0.15); border-color: var(--accent); color: var(--accent-2); }
.journey-arrow { color: var(--text-4); font-size: 1rem; padding: 0 0.2rem; }

/* ================================================================
   PAGE HERO (sub-pages)
   ================================================================ */
.page-hero {
  padding: 10rem 0 5rem;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(37,99,235,0.15) 0%, transparent 70%),
    var(--bg);
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.page-hero .section-label { justify-content: center; display: flex; }
.page-hero h1 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 1rem; }
.page-hero p  { max-width: 560px; margin: 0 auto; }

/* ================================================================
   CASE STUDY (Enterprise AI Page)
   ================================================================ */
.case-study { margin-bottom: 3rem; }
.cs-header {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 2rem 2.5rem; border-bottom: 1px solid var(--border);
}
.cs-header-top {
  display: flex; align-items: flex-start; justify-content: space-between;
  flex-wrap: wrap; gap: 1rem;
}
.cs-org { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent-2); margin-bottom: 0.3rem; }
.cs-header h2 { font-size: 1.45rem; margin-bottom: 0.8rem; }
.cs-meta { display: flex; flex-wrap: wrap; gap: 1.2rem; font-size: 0.82rem; color: var(--text-3); }
.cs-meta span { display: flex; align-items: center; gap: 0.35rem; }
.cs-body {
  background: var(--bg-card); border: 1px solid var(--border);
  border-top: none; border-radius: 0 0 var(--radius) var(--radius);
  padding: 2rem 2.5rem;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem;
}
.cs-section h4 {
  font-size: 0.68rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--accent-2); margin-bottom: 0.7rem;
}
.cs-section p, .cs-section li { font-size: 0.875rem; color: var(--text-2); }
.cs-section ul { padding-left: 1.1rem; list-style: disc; }
.cs-section ul li { margin-bottom: 0.3rem; }
.cs-impact-num { font-size: 1.8rem; font-weight: 800; color: var(--accent-2); line-height: 1; }
.cs-impact-lbl { font-size: 0.78rem; color: var(--text-3); margin-top: 0.2rem; }

/* ================================================================
   GENAI LAB
   ================================================================ */
.lab-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.7rem;
  transition: all var(--t);
}
.lab-card:hover { border-color: rgba(56,189,248,0.3); transform: translateY(-3px); }
.lab-card-label { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent-2); margin-bottom: 0.4rem; }
.lab-card h3 { font-size: 1rem; margin-bottom: 0.4rem; }
.lab-card p  { font-size: 0.85rem; color: var(--text-3); }

/* ================================================================
   CONTACT
   ================================================================ */
.contact-item {
  display: flex; align-items: center; gap: 1.2rem;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.6rem 2rem;
  transition: all var(--t); text-decoration: none;
}
.contact-item:hover { border-color: var(--border-2); transform: translateY(-3px); }
.contact-icon {
  width: 48px; height: 48px; min-width: 48px; border-radius: 10px;
  background: rgba(37,99,235,0.12); border: 1px solid rgba(37,99,235,0.2);
  display: flex; align-items: center; justify-content: center; font-size: 1.3rem;
}
.contact-icon svg { width: 22px; height: 22px; stroke: var(--accent-2); fill: none; stroke-width: 1.8; }
.contact-lbl { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-3); margin-bottom: 0.2rem; }
.contact-val { font-weight: 600; color: var(--text); font-size: 0.95rem; }

/* ================================================================
   FOOTER
   ================================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 3.5rem 0;
}
.footer-inner {
  display: flex; align-items: flex-start; justify-content: space-between;
  flex-wrap: wrap; gap: 2rem;
}
.footer-brand { font-size: 1.1rem; font-weight: 800; color: var(--text); letter-spacing: -0.02em; }
.footer-brand span { color: var(--accent-2); }
.footer-tagline { font-size: 0.82rem; color: var(--text-3); margin-top: 0.35rem; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; }
.footer-nav a { font-size: 0.85rem; color: var(--text-3); transition: color var(--t); }
.footer-nav a:hover { color: var(--text); }
.footer-copy { font-size: 0.78rem; color: var(--text-4); margin-top: 0.5rem; }

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); gap: 2rem 1.5rem; }
  .grid-4     { grid-template-columns: repeat(2, 1fr); }
  .grid-6     { grid-template-columns: repeat(3, 1fr); }
  .cs-body    { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .section    { padding: 4rem 0; }
  .section-sm { padding: 2.5rem 0; }
  .grid-2, .grid-3, .grid-4, .grid-6 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .cs-body    { grid-template-columns: 1fr; }
  .hero-btns  { flex-direction: column; align-items: flex-start; }
  .journey-flow { flex-direction: column; align-items: flex-start; }
  .journey-arrow { transform: rotate(90deg); }
  .nav-links {
    display: none; flex-direction: column; align-items: flex-start; gap: 0.25rem;
    position: fixed; top: 60px; left: 0; right: 0;
    background: rgba(11,18,32,0.97);
    backdrop-filter: blur(20px);
    padding: 1.5rem 2rem 2rem;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.6rem 0.8rem; width: 100%; }
  .nav-toggle { display: block; }
  .footer-inner { flex-direction: column; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
  h1 { font-size: 2rem; }
  .container { padding: 0 1.25rem; }
}

/* ================================================================
   UTILITY
   ================================================================ */
.text-accent  { color: var(--accent-2); }
.text-muted   { color: var(--text-3); }
.text-center  { text-align: center; }
.text-sm      { font-size: 0.875rem; }
.fw-600       { font-weight: 600; }
.mt-1 { margin-top: 0.4rem; }
.mt-2 { margin-top: 0.9rem; }
.mt-3 { margin-top: 1.6rem; }
.mt-4 { margin-top: 2.5rem; }
.mb-1 { margin-bottom: 0.4rem; }
.mb-2 { margin-bottom: 0.9rem; }
.mb-3 { margin-bottom: 1.6rem; }
.gap-1 { gap: 0.5rem; }
.flex  { display: flex; align-items: center; }
.flex-wrap { flex-wrap: wrap; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar       { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 3px; }