/* =========================================================================
   NVD Digital Concepts — styles.css
   Premium B2B. Off-white / warm beige / charcoal. Bronze as small accent.
   ========================================================================= */

:root {
  --bg: #FAF8F3;          /* off-white main background */
  --beige: #E7D8C5;       /* warm beige surface */
  --beige-soft: #F1E9DD;  /* lighter beige for subtle sections */
  --border: #D4C1A8;      /* soft sand border */
  --border-soft: rgba(29,29,27,0.10);
  --text: #1D1D1B;        /* charcoal text */
  --text-2: #6A655D;      /* muted charcoal */
  --dark: #121211;        /* deep charcoal contrast */
  --bronze: #A8794D;      /* warm bronze detail accent */

  --radius-sm: 12px;
  --radius: 18px;
  --radius-lg: 26px;
  --radius-xl: 34px;

  --shadow-sm: 0 1px 2px rgba(29,29,27,0.04), 0 6px 18px rgba(29,29,27,0.05);
  --shadow-md: 0 12px 34px rgba(29,29,27,0.08);
  --shadow-lg: 0 26px 64px rgba(29,29,27,0.12);

  --maxw: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", Roboto, sans-serif;
}

/* ----------------------------- Reset ----------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0; font-family: var(--font); background: var(--bg); color: var(--text);
  font-size: 18px; line-height: 1.65;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
h1,h2,h3,h4 { margin: 0; font-weight: 600; letter-spacing: -0.02em; line-height: 1.12; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.skip-link { position: absolute; left: -9999px; top: 0; z-index: 200; background: var(--dark); color: #fff; padding: 10px 16px; border-radius: 0 0 10px 0; }
.skip-link:focus { left: 0; }

/* ----------------------------- Buttons ----------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  font-family: inherit; font-size: 16px; font-weight: 500; letter-spacing: -0.01em;
  padding: 15px 28px; border-radius: 999px; border: 1px solid transparent; cursor: pointer;
  transition: transform .35s var(--ease), background .25s var(--ease), color .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
  white-space: nowrap;
}
.btn-primary { background: var(--dark); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(18,18,17,0.28); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--text); }
.btn-ghost:hover { background: var(--text); color: #fff; transform: translateY(-2px); }
.btn-light { background: #fff; color: var(--text); border-color: var(--border); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-block { width: 100%; }

/* ----------------------------- Header ----------------------------- */
.site-header { position: fixed; top: 14px; left: 0; right: 0; z-index: 100; display: flex; justify-content: center; padding: 0 16px; }
.header-inner {
  width: 100%; max-width: var(--maxw); display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 10px 12px 10px 22px; background: rgba(250,248,243,0.78);
  -webkit-backdrop-filter: saturate(180%) blur(18px); backdrop-filter: saturate(180%) blur(18px);
  border: 1px solid var(--border); border-radius: 999px;
  transition: box-shadow .35s var(--ease), border-color .35s var(--ease), background .35s var(--ease);
}
.site-header.scrolled .header-inner { box-shadow: var(--shadow-md); background: rgba(250,248,243,0.92); }
.brand { font-size: 19px; font-weight: 700; letter-spacing: -0.02em; display: inline-flex; align-items: baseline; gap: 7px; }
.brand span { font-size: 13px; font-weight: 500; color: var(--text-2); letter-spacing: 0; }
.nav-center { display: flex; gap: 26px; }
.nav-center a { font-size: 15px; color: var(--text-2); transition: color .2s var(--ease); }
.nav-center a:hover, .nav-center a.active { color: var(--text); }
.header-actions { display: flex; align-items: center; gap: 10px; }

.menu-toggle { display: none; flex-direction: column; gap: 5px; width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 50%; background: #fff; align-items: center; justify-content: center; cursor: pointer; }
.menu-toggle span { width: 18px; height: 1.6px; background: var(--text); transition: transform .3s var(--ease), opacity .3s var(--ease); }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.6px) rotate(-45deg); }

.mobile-nav { display: none; flex-direction: column; gap: 4px; position: absolute; top: 70px; left: 16px; right: 16px; background: rgba(250,248,243,0.98); -webkit-backdrop-filter: blur(18px); backdrop-filter: blur(18px); border: 1px solid var(--border); border-radius: 22px; padding: 14px; box-shadow: var(--shadow-lg); opacity: 0; transform: translateY(-8px); pointer-events: none; transition: opacity .3s var(--ease), transform .3s var(--ease); }
.mobile-nav.open { opacity: 1; transform: translateY(0); pointer-events: auto; }
.mobile-nav a { padding: 13px 14px; border-radius: 12px; font-size: 17px; color: var(--text); }
.mobile-nav a:hover { background: var(--beige-soft); }
.mobile-nav .btn { margin-top: 8px; }

/* ----------------------------- Sections ----------------------------- */
.section { padding: 104px 0; }
.section-beige { background: var(--beige-soft); }
.section-dark { background: var(--dark); color: #fff; }
.section-head { max-width: 760px; margin: 0 auto 60px; text-align: center; }
.section-head.left { margin-left: 0; text-align: left; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--bronze); margin-bottom: 18px; }
.section-title { font-size: clamp(29px, 4vw, 46px); }
.section-sub { margin-top: 20px; font-size: clamp(17px, 1.4vw, 20px); color: var(--text-2); }
.section-dark .section-sub { color: rgba(255,255,255,0.66); }

/* ----------------------------- Hero ----------------------------- */
.hero { padding: 172px 0 96px; }
.hero.compact { padding: 168px 0 64px; }
.hero-grid { display: grid; grid-template-columns: 1.08fr 0.92fr; gap: 54px; align-items: center; }
.hero-title { font-size: clamp(40px, 6.4vw, 76px); letter-spacing: -0.035em; line-height: 1.04; }
.hero-sub { margin-top: 26px; max-width: 560px; font-size: clamp(17px, 1.5vw, 21px); color: var(--text-2); }
.hero-cta { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-micro { margin-top: 26px; font-size: 14px; color: var(--text-2); letter-spacing: 0.01em; }

/* page hero (inner pages) */
.page-hero { padding: 168px 0 40px; }
.page-hero .hero-title { font-size: clamp(36px, 5.4vw, 62px); }
.page-hero .hero-sub { margin-left: auto; margin-right: auto; }
.page-hero.center { text-align: center; }
.page-hero.center .hero-sub { margin-left: auto; margin-right: auto; }

/* ----------------------------- Hero visual ----------------------------- */
.hero-visual { position: relative; }
.hv-stage {
  position: relative; width: 100%; aspect-ratio: 1 / 0.94; border-radius: var(--radius-xl);
  background: linear-gradient(160deg, #ffffff 0%, var(--beige) 130%);
  border: 1px solid var(--border); box-shadow: var(--shadow-lg); overflow: hidden;
}
.hv-grid-line { position: absolute; inset: 0; opacity: .5; }
.hv-card { position: absolute; background: #fff; border: 1px solid var(--border); border-radius: 15px; padding: 14px 16px; box-shadow: var(--shadow-md); display: flex; align-items: center; gap: 12px; }
.hv-card .lbl { font-size: 12px; color: var(--text-2); }
.hv-card .val { font-size: 14px; font-weight: 600; }
.hv-ic { width: 34px; height: 34px; border-radius: 10px; display: flex; align-items: center; justify-content: center; background: var(--beige-soft); color: var(--bronze); flex: 0 0 auto; }
.hv-ic svg { width: 18px; height: 18px; }
.hv-1 { top: 12%; left: 8%; } .hv-2 { top: 43%; right: 7%; } .hv-3 { bottom: 12%; left: 15%; }
.hv-bars { position: absolute; bottom: 16%; right: 12%; display: flex; align-items: flex-end; gap: 6px; height: 74px; padding: 12px; background: rgba(255,255,255,0.9); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow-sm); }
.hv-bars span { width: 12px; border-radius: 4px 4px 0 0; background: var(--dark); opacity: .82; }
.hv-bars span:nth-child(odd){ background: var(--bronze); }
.float-a { animation: floatY 7s ease-in-out infinite; }
.float-b { animation: floatY 9s ease-in-out infinite .6s; }
.float-c { animation: floatY 8s ease-in-out infinite 1.2s; }
@keyframes floatY { 0%,100% { transform: translateY(0);} 50% { transform: translateY(-9px);} }

/* ----------------------------- Grids & Cards ----------------------------- */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 30px; box-shadow: var(--shadow-sm); transition: transform .4s var(--ease), box-shadow .4s var(--ease); }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.card h3 { font-size: 21px; margin-bottom: 12px; }
.card p { color: var(--text-2); font-size: 16px; }
.card-num { font-size: 13px; font-weight: 700; letter-spacing: 0.06em; color: var(--bronze); margin-bottom: 16px; }

.icon-badge { width: 48px; height: 48px; border-radius: 14px; background: var(--beige-soft); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; color: var(--bronze); margin-bottom: 20px; }
.icon-badge svg { width: 24px; height: 24px; }

/* service list bullets */
.tick-list { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.tick-list li { position: relative; padding-left: 26px; color: var(--text-2); font-size: 16px; }
.tick-list li::before { content: ""; position: absolute; left: 0; top: 8px; width: 13px; height: 8px; border-left: 2px solid var(--bronze); border-bottom: 2px solid var(--bronze); transform: rotate(-45deg); }

/* ----------------------------- Feature row ----------------------------- */
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; }
.feature-row + .feature-row { margin-top: 30px; }
.feature-row.reverse .feature-text { order: 2; }
.feature-text h3 { font-size: clamp(24px, 3vw, 34px); margin-bottom: 16px; }
.feature-text p { color: var(--text-2); font-size: 18px; }
.feature-visual { background: var(--beige-soft); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 34px; min-height: 240px; display: flex; align-items: center; justify-content: center; }

/* ----------------------------- Process ----------------------------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 30px; position: relative; box-shadow: var(--shadow-sm); transition: transform .4s var(--ease), box-shadow .4s var(--ease); }
.step:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.step-num { width: 42px; height: 42px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 700; color: #fff; background: var(--dark); margin-bottom: 20px; }
.step h3 { font-size: 20px; margin-bottom: 10px; }
.step p { color: var(--text-2); font-size: 15.5px; }

/* process vertical (process page) */
.timeline { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 0; }
.tl-item { display: grid; grid-template-columns: 64px 1fr; gap: 24px; padding: 30px 0; border-bottom: 1px solid var(--border); }
.tl-item:last-child { border-bottom: none; }
.tl-num { width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: 700; color: #fff; background: var(--dark); }
.tl-body h3 { font-size: 24px; margin-bottom: 10px; }
.tl-body p { color: var(--text-2); font-size: 17px; }

/* ----------------------------- Why / value list ----------------------------- */
.value-card { background: var(--beige-soft); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 30px; }
.value-card h3 { font-size: 20px; margin-bottom: 10px; }
.value-card p { color: var(--text-2); font-size: 16px; }

/* ----------------------------- Case study cards ----------------------------- */
.case-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); transition: transform .4s var(--ease), box-shadow .4s var(--ease); }
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.case-top { padding: 26px 28px; background: var(--beige); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.case-top h3 { font-size: 19px; }
.case-tag { font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--bronze); background: var(--bg); border: 1px solid var(--border); padding: 5px 11px; border-radius: 999px; }
.case-body { padding: 26px 28px; display: flex; flex-direction: column; gap: 14px; }
.case-row .k { font-size: 12px; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; color: var(--text-2); margin-bottom: 3px; }
.case-row .v { font-size: 16px; color: var(--text); }

/* ----------------------------- CTA band ----------------------------- */
.cta-band { text-align: center; }
.cta-band .section-title { color: #fff; }
.cta-band .btn { margin-top: 30px; }

/* ----------------------------- Contact ----------------------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: start; }
.contact-copy .section-title { text-align: left; }
.info-block { margin-top: 28px; display: flex; flex-direction: column; gap: 16px; }
.info-item .k { font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-2); margin-bottom: 4px; }
.info-item .v { font-size: 17px; }
.info-item .v a { color: var(--text); border-bottom: 1px solid var(--border); }
.info-item .v a:hover { border-color: var(--text); }

.contact-form { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 34px; box-shadow: var(--shadow-md); }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 8px; }
.field input, .field textarea, .field select { width: 100%; font-family: inherit; font-size: 16px; color: var(--text); padding: 14px 16px; background: var(--bg); border: 1px solid var(--border); border-radius: 12px; transition: border-color .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease); }
.field select { appearance: none; -webkit-appearance: none; cursor: pointer; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236A655D' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 16px center; padding-right: 40px; }
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--bronze); background: #fff; box-shadow: 0 0 0 4px rgba(168,121,77,0.12); }
.field textarea { resize: vertical; }
.form-status { margin-top: 14px; font-size: 14px; color: var(--text-2); min-height: 18px; }

/* ----------------------------- Legal pages ----------------------------- */
.legal { padding: 150px 0 90px; }
.legal-head { max-width: 820px; margin: 0 auto 44px; }
.legal-head h1 { font-size: clamp(32px, 4.6vw, 52px); letter-spacing: -0.03em; }
.legal-updated { margin-top: 14px; font-size: 15px; color: var(--text-2); }
.legal-body { max-width: 820px; margin: 0 auto; }
.legal-body h2 { font-size: 23px; margin: 42px 0 12px; }
.legal-body h2:first-child { margin-top: 0; }
.legal-body h3 { font-size: 18px; margin: 24px 0 8px; }
.legal-body p { color: var(--text-2); font-size: 17px; margin-bottom: 14px; }
.legal-body ul { margin: 0 0 16px; display: flex; flex-direction: column; gap: 9px; }
.legal-body li { position: relative; padding-left: 22px; color: var(--text-2); font-size: 17px; }
.legal-body li::before { content: ""; position: absolute; left: 0; top: 11px; width: 6px; height: 6px; border-radius: 50%; background: var(--bronze); }
.legal-body a { color: var(--text); font-weight: 500; border-bottom: 1px solid var(--border); }
.legal-note { background: var(--beige-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; margin: 24px 0; font-size: 15px; color: var(--text-2); }
.legal-table { width: 100%; border-collapse: collapse; margin: 10px 0 20px; }
.legal-table td { padding: 12px 14px; border: 1px solid var(--border); font-size: 16px; vertical-align: top; }
.legal-table td:first-child { width: 42%; font-weight: 600; color: var(--text); background: var(--beige-soft); }
.legal-back { display: inline-flex; align-items: center; gap: 8px; margin-top: 46px; font-size: 16px; font-weight: 500; }
.legal-back::before { content: "\2190"; }

/* ----------------------------- Footer ----------------------------- */
.site-footer { background: var(--dark); color: rgba(255,255,255,0.72); padding: 66px 0 34px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.12); }
.footer-brand .brand { color: #fff; }
.footer-brand .brand span { color: rgba(255,255,255,0.6); }
.footer-about { margin-top: 16px; font-size: 15px; max-width: 340px; line-height: 1.6; }
.footer-col h4 { font-size: 13px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: rgba(255,255,255,0.5); margin-bottom: 16px; }
.footer-col a { display: block; font-size: 15px; color: rgba(255,255,255,0.72); padding: 6px 0; transition: color .2s var(--ease); }
.footer-col a:hover { color: #fff; }
.footer-bottom { padding-top: 26px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
.footer-company { font-size: 13px; color: rgba(255,255,255,0.5); max-width: 720px; line-height: 1.6; }
.footer-copy { font-size: 13px; color: rgba(255,255,255,0.5); }

/* ----------------------------- Reveal ----------------------------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s var(--ease), transform .8s var(--ease); will-change: opacity, transform; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ----------------------------- Responsive ----------------------------- */
@media (max-width: 1000px) {
  .nav-center { display: none; }
  .header-actions .btn-sm { display: none; }
  .menu-toggle { display: flex; }
  .mobile-nav { display: flex; }
  .hero-grid { grid-template-columns: 1fr; gap: 46px; }
  .hero-visual { max-width: 470px; margin: 0 auto; width: 100%; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .feature-row { grid-template-columns: 1fr; gap: 28px; }
  .feature-row.reverse .feature-text { order: 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  body { font-size: 17px; }
  .section { padding: 72px 0; }
  .hero { padding: 140px 0 60px; }
  .hero-title { font-size: clamp(36px, 10.5vw, 50px); }
  .header-inner { padding: 9px 10px 9px 18px; }
  .section-head { margin-bottom: 44px; }
  .grid-2, .grid-3, .grid-4, .steps { grid-template-columns: 1fr; }
  .contact-form { padding: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .legal { padding: 130px 0 70px; }
  .brand span { display: none; }
}

/* ----------------------------- Reduced motion ----------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
}