/* ==========================================================================
   DAS · Data · AI · Solutions — Corporate Clean
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --bg: #fafafa;
  --bg-alt: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;

  --text: #0f172a;
  --muted: #64748b;
  --muted-2: #94a3b8;

  --accent: #2563eb;
  --accent-2: #4f46e5;
  --violet: #7c3aed;
  --accent-soft: rgba(37, 99, 235, 0.08);

  --grad: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 55%, var(--violet) 100%);

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 25px 50px -12px rgba(15, 23, 42, 0.18);

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 22px;

  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-head: "Plus Jakarta Sans", var(--font-body);
  --font-mono: "JetBrains Mono", ui-monospace, "Fira Code", monospace;

  --container: 1160px;
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t: all 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0 0 0.5em;
}

p { margin: 0 0 1rem; }
a { color: var(--accent); text-decoration: none; transition: var(--t); }
a:hover { color: var(--accent-2); }
img { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 20px;
}

.section { padding: 84px 0; }
.section-alt { background: var(--bg-alt); }

.section-head {
  max-width: 720px;
  margin: 0 auto 48px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(37, 99, 235, 0.15);
  padding: 5px 12px;
  border-radius: 999px;
  margin: 0 0 16px;
}

.section-title {
  font-size: clamp(1.6rem, 1.1rem + 2.2vw, 2.5rem);
  font-weight: 800;
}

.section-lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 0;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 200;
  background: var(--text);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  transition: var(--t);
}
.skip-link:focus { top: 12px; color: #fff; }

/* ---------- Buttons ---------- */
.btn {
  --btn-pad: 14px 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: var(--btn-pad);
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--t);
  white-space: nowrap;
  text-align: center;
}
.btn-sm { --btn-pad: 9px 18px; font-size: 0.86rem; }
.btn-block { width: 100%; }

.btn-primary {
  background: var(--grad);
  background-size: 160% 160%;
  color: #fff;
  box-shadow: 0 8px 20px -8px rgba(79, 70, 229, 0.6);
}
.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  background-position: 100% 0;
  box-shadow: 0 14px 28px -10px rgba(79, 70, 229, 0.7);
}
.btn-primary:disabled { opacity: 0.7; cursor: progress; transform: none; }

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.btn-ghost:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: var(--t);
}
.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(250, 250, 250, 0.82);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: var(--t);
}
.site-header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 6px 20px -14px rgba(15, 23, 42, 0.4);
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); }
.brand:hover { color: var(--text); }
.brand-logo { display: block; height: 42px; width: auto; }
.brand-logo-sm { height: 34px; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--grad);
  color: #fff;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 18px -8px rgba(79, 70, 229, 0.7);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-family: var(--font-head); font-size: 1.12rem; font-weight: 800; letter-spacing: 0.01em; }
.brand-text small { font-size: 0.68rem; color: var(--muted); letter-spacing: 0.02em; }

.main-nav { display: flex; align-items: center; gap: 8px; }
.main-nav ul { display: flex; align-items: center; gap: 2px; }

.nav-link {
  display: inline-block;
  padding: 8px 13px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
}
.nav-link:hover { color: var(--text); background: rgba(15, 23, 42, 0.04); }
.nav-link.active { color: var(--accent); background: var(--accent-soft); }

.nav-cta { margin-left: 8px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
  transition: var(--t);
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin-inline: auto;
  background: var(--text);
  border-radius: 2px;
  transition: var(--t);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(60px, 9vw, 120px) 0 clamp(50px, 7vw, 96px);
}
.hero-glow {
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 640px;
  background:
    radial-gradient(45% 55% at 30% 30%, rgba(37, 99, 235, 0.16), transparent 70%),
    radial-gradient(40% 50% at 78% 22%, rgba(124, 58, 237, 0.14), transparent 72%);
  filter: blur(6px);
  pointer-events: none;
  z-index: 0;
}
.hero-inner { position: relative; z-index: 1; max-width: 880px; text-align: center; margin-inline: auto; }

.hero-title {
  font-size: clamp(2rem, 1.2rem + 4vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
}
.hero-subtitle {
  font-size: clamp(1rem, 0.9rem + 0.6vw, 1.22rem);
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 32px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin: 56px auto 0;
  max-width: 780px;
  padding-top: 36px;
  border-top: 1px solid var(--border);
}
.hero-stats li { display: flex; flex-direction: column; gap: 2px; }
.hero-stats strong {
  font-family: var(--font-head);
  font-size: 1.7rem;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-stats span { font-size: 0.86rem; color: var(--muted); }

/* ---------- Pillars ---------- */
.pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.pillar { padding: 28px; }
.pillar-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.25rem;
  margin-bottom: 16px;
}
.pillar h3 { font-size: 1.15rem; margin-bottom: 8px; }
.pillar p { color: var(--muted); font-size: 0.95rem; margin: 0; }

/* ---------- Services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.service { padding: 30px; }
.service-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(124, 58, 237, 0.12));
  font-size: 1.4rem;
  margin-bottom: 18px;
}
.service h3 { font-size: 1.2rem; margin-bottom: 10px; }
.service p { color: var(--muted); font-size: 0.95rem; }

.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.tag-list li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-2);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 8px;
}

/* ---------- Solutions ---------- */
.solutions-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.solution { padding: 26px; }
.solution h3 { font-size: 1.05rem; margin-bottom: 8px; }
.solution p { color: var(--muted); font-size: 0.92rem; margin: 0; }

/* ---------- Team ---------- */
.team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.team-card {
  display: flex;
  flex-direction: column;
  padding: 30px;
}
.team-avatar {
  width: 68px;
  height: 68px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.35rem;
  color: #fff;
  margin-bottom: 18px;
  box-shadow: var(--shadow-sm);
}
.team-card h3 { font-size: 1.25rem; margin-bottom: 4px; }
.team-role {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 14px;
}
.team-summary { color: var(--muted); font-size: 0.92rem; flex-grow: 1; }
.team-card .tag-list { margin-top: 16px; }
.team-card .btn { margin-top: 22px; }

/* ---------- Contact ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}
.contact-intro .section-lead { margin-bottom: 26px; }
.contact-facts { display: grid; gap: 14px; }
.contact-facts li {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 0.95rem;
}
.contact-facts span {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  flex: 0 0 auto;
}

.contact-form { padding: 32px; }
.field { margin-bottom: 18px; }
.field-row { display: grid; grid-template-columns: 1fr; gap: 18px; }
.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 7px;
  color: var(--text);
}
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--t);
  resize: vertical;
}
.field input::placeholder,
.field textarea::placeholder { color: var(--muted-2); }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.field input.invalid,
.field select.invalid,
.field textarea.invalid {
  border-color: #ef4444;
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}
.field select:invalid { color: var(--muted-2); }

.hidden-hp {
  position: absolute !important;
  left: -9999px !important;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.form-status {
  margin: 14px 0 0;
  font-size: 0.9rem;
  min-height: 1.2em;
  text-align: center;
}
.form-status.ok { color: #059669; font-weight: 600; }
.form-status.err { color: #dc2626; font-weight: 600; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 46px 0 34px;
}
.footer-inner {
  display: grid;
  gap: 24px;
  align-items: center;
}
.footer-brand { display: flex; align-items: center; gap: 14px; }
.footer-brand p { margin: 0; font-family: var(--font-head); font-weight: 700; line-height: 1.3; }
.footer-brand small { font-family: var(--font-body); font-weight: 400; color: var(--muted); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer-nav a { color: var(--muted); font-size: 0.9rem; }
.footer-nav a:hover { color: var(--accent); }
.footer-legal { margin: 0; color: var(--muted); font-size: 0.82rem; }

/* ---------- Legal page ---------- */
.legal {
  max-width: 820px;
  padding-top: 56px;
  padding-bottom: 80px;
}
.legal .section-title { margin-bottom: 6px; }
.legal-updated { color: var(--muted); font-size: 0.88rem; margin-bottom: 30px; }
.legal h2 { font-size: 1.15rem; margin: 34px 0 10px; }
.legal p,
.legal li { color: var(--muted); font-size: 0.97rem; }
.legal ul { list-style: disc; padding-left: 22px; margin: 0 0 1rem; }
.legal ul li { margin-bottom: 6px; }
.legal strong { color: var(--text); }
.legal-back { margin-top: 40px; }

/* ---------- Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: grid;
  place-items: center;
  padding: 20px;
}
.modal[hidden] { display: none; }
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.25s ease;
}
.modal.open .modal-backdrop { opacity: 1; }

.modal-panel {
  position: relative;
  width: min(680px, 100%);
  max-height: 88vh;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 36px;
  opacity: 0;
  transform: translateY(18px) scale(0.98);
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease);
}
.modal.open .modal-panel { opacity: 1; transform: translateY(0) scale(1); }

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--muted);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  transition: var(--t);
}
.modal-close:hover { color: var(--text); background: var(--surface); transform: rotate(90deg); }

.modal-header { display: flex; gap: 18px; align-items: center; margin-bottom: 22px; padding-right: 40px; }
.modal-avatar {
  width: 76px;
  height: 76px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  color: #fff;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.5rem;
  flex: 0 0 auto;
}
.modal-header h3 { margin: 0 0 4px; font-size: 1.4rem; }
.modal-header p { margin: 0; color: var(--accent); font-weight: 600; font-size: 0.9rem; }

.modal-section { margin-bottom: 22px; }
.modal-section h4 {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 8px;
}
.modal-section p { color: var(--text); font-size: 0.95rem; margin: 0; }
.modal-section ul { display: grid; gap: 7px; }
.modal-section ul li {
  position: relative;
  padding-left: 20px;
  color: var(--muted);
  font-size: 0.93rem;
}
.modal-section ul li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--grad);
}

.modal-recommend {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.07), rgba(124, 58, 237, 0.07));
  border: 1px solid rgba(79, 70, 229, 0.22);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.modal-recommend h4 {
  color: var(--accent-2);
  display: flex;
  align-items: center;
  gap: 8px;
}
.modal-recommend p { color: var(--text); }

body.modal-open { overflow: hidden; }

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  will-change: opacity, transform;
}
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (min-width: 640px) {
  .hero-stats { grid-template-columns: repeat(4, 1fr); }
  .field-row { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: 1fr auto; }
  .footer-legal { grid-column: 1 / -1; }
  .solutions-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
  .pillars { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1024px) {
  .section { padding: 104px 0; }
  .contact-layout { grid-template-columns: 1fr 1.1fr; gap: 56px; }
  .services-grid { gap: 24px; }
  .footer-inner { grid-template-columns: 1.4fr 1fr auto; }
  .footer-legal { grid-column: auto; text-align: right; }
}

/* ---------- Mobile nav ---------- */
@media (max-width: 899px) {
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 18px 20px 26px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: var(--t);
  }
  .main-nav.open { transform: none; opacity: 1; visibility: visible; }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav-link { padding: 12px 14px; border-radius: 12px; font-size: 1rem; }
  .nav-cta { margin: 10px 0 0; }
}

@media (max-width: 480px) {
  .brand-logo { height: 36px; }
  .brand-logo-sm { height: 30px; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}