/* ==========================================================================
   Sdtanish Enterprises — Stylesheet
   Sections: 1. Tokens  2. Reset  3. Base/Type  4. Layout utilities
             5. Header/Nav  6. Hero  7. About  8. Services  9. Why Choose Us
             10. Approach/Timeline  11. Contact  12. Footer  13. Reveal anim
             14. Responsive
   ========================================================================== */

/* ---------------------------- 1. Tokens ---------------------------- */
:root {
  /* Color */
  --color-bg: #F5F6F8;
  --color-surface: #FFFFFF;
  --color-ink: #10182B;
  --color-ink-soft: #40485C;
  --color-muted: #6B7280;
  --color-border: #E1E4EA;

  --color-primary: #1F5C46;
  --color-primary-dark: #163F31;
  --color-primary-soft: #E6EFEA;

  --color-accent: #C69A3E;
  --color-accent-soft: #FBF3E1;

  --color-danger: #B3261E;

  /* Type */
  --font-display: 'Space Grotesk', 'Segoe UI', system-ui, sans-serif;
  --font-body: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6.5rem;

  /* Layout */
  --content-width: 1140px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 2px rgba(16, 24, 43, 0.06);
  --shadow-md: 0 8px 24px rgba(16, 24, 43, 0.08);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------------------------- 2. Reset ---------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body, h1, h2, h3, p, ul, ol, figure {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

button, input, textarea {
  font: inherit;
  color: inherit;
}

/* ---------------------------- 3. Base / Type ---------------------------- */
body {
  background: var(--color-bg);
  color: var(--color-ink-soft);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--color-ink);
  line-height: 1.15;
  letter-spacing: -0.01em;
  font-weight: 600;
}

h1 { font-size: clamp(2.2rem, 4.2vw, 3.4rem); font-weight: 700; }
h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
h3 { font-size: 1.15rem; }

p { max-width: 62ch; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

/* Focus states */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--color-ink);
  color: #fff;
  padding: var(--space-2) var(--space-3);
  z-index: 200;
  border-radius: var(--radius-sm);
}
.skip-link:focus {
  left: var(--space-3);
  top: var(--space-3);
}

/* ---------------------------- 4. Layout utilities ---------------------------- */
.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.section {
  padding-block: var(--space-8);
}

.section-alt {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-heading {
  max-width: 640px;
  margin-bottom: var(--space-6);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-dark); }

.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-ink);
}
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn-small { padding: 0.6rem 1.15rem; font-size: 0.88rem; }
.btn-block { width: 100%; }

/* ---------------------------- 5. Header / Nav ---------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 246, 248, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.logo-mark { color: var(--color-primary); display: inline-flex; }

.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-ink);
  white-space: nowrap;
}
.logo-text-light { font-weight: 500; color: var(--color-muted); margin-left: 0.15em; }

.main-nav ul {
  display: flex;
  gap: var(--space-5);
}
.main-nav a {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--color-ink-soft);
  position: relative;
  padding-block: 4px;
}
.main-nav a:hover { color: var(--color-primary); }
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--color-accent);
  transition: width 0.2s var(--ease);
}
.main-nav a:hover::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: var(--space-3); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}
.nav-toggle-bar {
  width: 18px;
  height: 2px;
  background: var(--color-ink);
  margin-inline: auto;
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  display: none;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4);
}
.mobile-nav[data-state="open"] { display: block; }
.mobile-nav ul { display: flex; flex-direction: column; gap: var(--space-3); margin-bottom: var(--space-4); }
.mobile-nav a { font-size: 1rem; font-weight: 500; }

/* ---------------------------- 6. Hero ---------------------------- */
.hero {
  padding-block: var(--space-8) var(--space-7);
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: var(--space-6);
}
.hero-lead {
  font-size: 1.08rem;
  margin-block: var(--space-4);
  max-width: 46ch;
}
.hero-actions { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-top: var(--space-2); }

.hero-visual { display: flex; justify-content: center; }
.network-svg { width: 100%; max-width: 420px; height: auto; color: var(--color-primary); }

.network-lines .line-path {
  stroke: var(--color-border);
  stroke-width: 1.4;
  fill: none;
  stroke-dasharray: 240;
  stroke-dashoffset: 240;
  animation: draw-line 1.6s var(--ease) forwards;
}
.network-nodes .node {
  fill: var(--color-primary);
  opacity: 0;
  transform-origin: center;
  animation: node-in 0.5s var(--ease) forwards;
}
.node-b, .node-f { fill: var(--color-accent); }
.network-nodes .node-a { animation-delay: 0.1s; }
.network-nodes .node-b { animation-delay: 0.35s; }
.network-nodes .node-c { animation-delay: 0.6s; }
.network-nodes .node-d { animation-delay: 0.85s; }
.network-nodes .node-e { animation-delay: 0.75s; }
.network-nodes .node-f { animation-delay: 0.95s; }
.network-nodes .node-g { animation-delay: 1.1s; }
.network-nodes .node-c { animation-name: node-in-pulse; }

@keyframes draw-line { to { stroke-dashoffset: 0; } }
@keyframes node-in { to { opacity: 1; transform: scale(1); } from { opacity: 0; transform: scale(0.3); } }
@keyframes node-in-pulse {
  0% { opacity: 0; transform: scale(0.3); }
  60% { opacity: 1; transform: scale(1.35); }
  100% { opacity: 1; transform: scale(1); }
}

/* ---------------------------- 7. About ---------------------------- */
.about-inner {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: var(--space-6);
  align-items: start;
}
.about-body p { max-width: 60ch; margin-bottom: var(--space-3); }
.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}
.about-tags li {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
}

/* ---------------------------- 8. Services ---------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.service-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.service-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}
.service-card h3 { margin-bottom: var(--space-1); }
.service-card p { font-size: 0.95rem; }

/* ---------------------------- 9. Why Choose Us ---------------------------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}
.why-card {
  border-top: 3px solid var(--color-accent);
  padding-top: var(--space-3);
}
.why-card h3 { margin-bottom: var(--space-1); font-size: 1.05rem; }
.why-card p { font-size: 0.93rem; }

/* ---------------------------- 10. Approach / Timeline ---------------------------- */
.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  top: 28px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-border);
}
.timeline-step {
  position: relative;
  padding-top: var(--space-6);
}
.timeline-num {
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.timeline-step h3 { margin-bottom: var(--space-1); font-size: 1.05rem; }
.timeline-step p { font-size: 0.93rem; }

/* ---------------------------- 11. Contact ---------------------------- */
.contact-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-7);
}
.contact-lead { margin-block: var(--space-3) var(--space-5); }
.contact-details { display: flex; flex-direction: column; gap: var(--space-4); }
.contact-details li { display: flex; flex-direction: column; gap: 2px; }
.contact-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
}
.contact-details a { color: var(--color-primary); font-weight: 600; }
.contact-details a:hover { text-decoration: underline; }

.contact-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  box-shadow: var(--shadow-sm);
}
.form-row { display: flex; flex-direction: column; gap: 6px; }
.form-row label { font-size: 0.88rem; font-weight: 600; color: var(--color-ink); }
.form-row input,
.form-row textarea {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.85rem;
  background: var(--color-bg);
  resize: vertical;
}
.form-row input:focus,
.form-row textarea:focus { outline: none; border-color: var(--color-primary); background: var(--color-surface); }
.form-row.has-error input,
.form-row.has-error textarea { border-color: var(--color-danger); }
.form-error {
  font-size: 0.8rem;
  color: var(--color-danger);
  min-height: 1em;
}
.form-status {
  font-size: 0.92rem;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  display: none;
}
.form-status.show { display: block; }
.form-status.success { background: var(--color-primary-soft); color: var(--color-primary-dark); }
.form-status.error { background: #FBEAE9; color: var(--color-danger); }

/* ---------------------------- 12. Footer ---------------------------- */
.site-footer {
  background: var(--color-ink);
  color: #C7CBD6;
  padding-block: var(--space-6);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.footer-brand .logo-text { color: #fff; }
.footer-brand .logo-text-light { color: #8A93A8; }
.footer-brand p { font-size: 0.85rem; margin-top: 4px; color: #8A93A8; }
.footer-nav ul { display: flex; gap: var(--space-4); }
.footer-nav a { font-size: 0.9rem; color: #C7CBD6; }
.footer-nav a:hover { color: var(--color-accent); }
.footer-copy { font-size: 0.82rem; color: #8A93A8; width: 100%; text-align: center; margin-top: var(--space-4); }

/* ---------------------------- 13. Reveal animation ---------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .network-lines .line-path,
  .network-nodes .node {
    animation: none;
    stroke-dashoffset: 0;
    opacity: 1;
    transform: none;
  }
  .btn:hover, .service-card:hover { transform: none; }
}

/* ---------------------------- 14. Responsive ---------------------------- */
@media (max-width: 960px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .about-inner { grid-template-columns: 1fr; }
  .contact-inner { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .main-nav { display: none; }
  .header-actions .btn-small { display: none; }
  .nav-toggle { display: flex; }

  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 320px; margin-inline: auto; }

  .timeline { grid-template-columns: 1fr; gap: var(--space-5); }
  .timeline::before { display: none; }
  .timeline-step { padding-top: 0; padding-left: 56px; }
  .timeline-num { top: 0; left: 0; }
}

@media (max-width: 600px) {
  .services-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .section { padding-block: var(--space-7); }
  .footer-inner { justify-content: center; text-align: center; }
  .footer-nav ul { justify-content: center; flex-wrap: wrap; }
}