/* ============================================
   DNT.Group – Landing Page Styles
   Mobile-first, CSS variables, no external deps
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  /* Colors – light theme */
  --bg: #f8fafc;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --surface: #f1f5f9;
  --border: rgba(0, 0, 0, 0.08);
  --text: #1e293b;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  /* Accent & gradient */
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --gradient-start: #3b82f6;
  --gradient-mid: #8b5cf6;
  --gradient-end: #ec4899;
  --glow: rgba(59, 130, 246, 0.2);
  /* Typography */
  --font-sans: "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "Consolas", "Monaco", monospace;
  --text-xs: 0.8125rem;
  --text-sm: 0.9375rem;
  --text-base: 1.0625rem;
  --text-lg: 1.25rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.25rem;
  --text-4xl: 3rem;
  --text-5xl: 3.5rem;
  /* Spacing & layout */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --container: min(100% - 2rem, 72rem);
  --header-h: 4rem;
  /* Effects */
  --radius: 0.5rem;
  --radius-lg: 0.75rem;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

ul {
  list-style: none;
}

/* ---------- Layout: Container ---------- */
.container {
  width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

/* ---------- Header & Nav (mobile-first) ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text);
  font-weight: 700;
  font-size: var(--text-lg);
}

.nav__logo:hover {
  color: var(--text);
}

.nav__logo-img {
  width: 2rem;
  height: 2rem;
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--text);
}

.nav__toggle span {
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

.nav__menu {
  display: none;
  gap: var(--space-lg);
}

.nav__menu.is-open {
  display: flex;
  position: absolute;
  top: var(--header-h);
  left: 0;
  right: 0;
  flex-direction: column;
  padding: var(--space-lg);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.nav__link {
  color: var(--text-muted);
  font-size: var(--text-sm);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--accent);
}

/* Desktop nav */
@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }

  .nav__menu {
    display: flex;
    position: static;
    flex-direction: row;
    padding: 0;
    background: transparent;
    border: none;
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.btn--primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  color: #fff;
  border-color: transparent;
}

.btn--primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 20px var(--glow);
}

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

.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--full {
  width: 100%;
}

/* ---------- Section common ---------- */
.section {
  padding: var(--space-3xl) 0;
}

.section__head {
  text-align: center;
  margin-bottom: var(--space-2xl);
  max-width: 42rem;
  margin-inline: auto;
}

.section__label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.section__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--text);
}

.section__sub {
  font-size: var(--text-base);
  color: var(--text-muted);
  line-height: 1.7;
}

/* Reveal animation (JS adds .reveal-visible) */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.reveal-visible {
  opacity: 1;
  transform: translateY(0);
}

/* No-JS fallback: show content if JS doesn't load */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: calc(var(--header-h) + var(--space-2xl)) var(--space-md) var(--space-2xl);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.12), transparent),
              radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139, 92, 246, 0.08), transparent),
              radial-gradient(ellipse 50% 30% at 20% 80%, rgba(236, 72, 153, 0.05), transparent);
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(0, 0, 0, 0.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(0, 0, 0, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black, transparent);
}

.hero__wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xl);
}

.hero__content {
  text-align: center;
}

.hero__illustration {
  max-width: 400px;
  width: 100%;
}

.hero__img {
  width: 100%;
  height: auto;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@media (min-width: 900px) {
  .hero__wrapper {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .hero__content {
    text-align: left;
    flex: 1;
    max-width: 540px;
  }

  .hero__illustration {
    flex: 0 0 420px;
  }

  .hero__cta {
    justify-content: flex-start;
  }
}

.hero__badge {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.hero__title {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--text) 0%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  font-size: var(--text-xl);
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
  font-weight: 500;
}

.hero__desc {
  font-size: var(--text-lg);
  color: var(--text-muted);
  max-width: 36rem;
  margin: 0 auto var(--space-xl);
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-xs);
  color: var(--text-dim);
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-dim), transparent);
  border-radius: 1px;
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* ---------- About ---------- */
.about__grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

.about__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.about__card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.about__icon {
  font-size: var(--text-2xl);
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.about__icon-img {
  width: 56px;
  height: 56px;
  margin-bottom: var(--space-md);
}

.about__card h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.about__card p {
  font-size: var(--text-base);
  color: var(--text-muted);
  line-height: 1.7;
}

@media (min-width: 768px) {
  .section__title {
    font-size: var(--text-3xl);
  }

  .about__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- Member cards ---------- */
.members__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

.member-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
}

.member-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.member-card__logo {
  width: 100%;
  max-width: 160px;
  height: auto;
  border-radius: var(--radius);
}

.member-card__logo--lg {
  max-width: 220px;
}



.member-card__tag {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--accent);
  background: rgba(59, 130, 246, 0.12);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius);
}


@media (min-width: 640px) {
  .members__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .members__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- Solutions ---------- */
.solutions__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

.solution-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  position: relative;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.solution-card:hover {
  border-color: rgba(139, 92, 246, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.solution-card__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: var(--space-sm);
}

.solution-card__icon {
  width: 52px;
  height: 52px;
  margin-bottom: var(--space-md);
}

.solution-card h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.solution-card p {
  font-size: var(--text-base);
  color: var(--text-muted);
  line-height: 1.7;
}

@media (min-width: 640px) {
  .solutions__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .solutions__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- Partners ---------- */
.partners {
  background: var(--surface);
  overflow: hidden;
}

/* Auto-scroll marquee container */
.partners__marquee {
  margin-top: var(--space-xl);
  overflow: hidden;
  position: relative;
}

.partners__marquee::before,
.partners__marquee::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 100px;
  z-index: 2;
  pointer-events: none;
}

.partners__marquee::before {
  left: 0;
  background: linear-gradient(to right, var(--surface), transparent);
}

.partners__marquee::after {
  right: 0;
  background: linear-gradient(to left, var(--surface), transparent);
}

.partners__track {
  display: flex;
  gap: var(--space-lg);
  animation: marquee 40s linear infinite;
  width: max-content;
}

.partners__track:hover {
  animation-play-state: paused;
}

@keyframes marquee {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

.partner-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-lg);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.partner-logo img {
  height: 60px;
  width: auto;
  max-width: 180px;
  object-fit: contain;
  filter: grayscale(30%);
  opacity: 0.85;
  transition: filter var(--transition), opacity var(--transition);
}

.partner-logo:hover img {
  filter: grayscale(0%);
  opacity: 1;
}

.partner-logo:hover {
  transform: scale(1.08);
}

@media (min-width: 768px) {
  .partner-logo img {
    height: 70px;
    max-width: 200px;
  }
}

@media (min-width: 1024px) {
  .partner-logo img {
    height: 80px;
    max-width: 220px;
  }
  
  .partners__track {
    gap: var(--space-xl);
  }
}

/* ---------- Stats ---------- */
.stats {
  position: relative;
  padding: var(--space-3xl) 0;
}

.stats__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(59, 130, 246, 0.05) 50%, transparent 100%);
  pointer-events: none;
}

.stats__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  text-align: center;
  position: relative;
  z-index: 1;
}

.stat-item {
  padding: var(--space-xl);
}

.stat-item__value {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item__suffix {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--accent);
}

.stat-item__label {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-top: var(--space-sm);
}

@media (min-width: 640px) {
  .stats__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- Contact form ---------- */
.contact__form {
  max-width: 28rem;
  margin-inline: auto;
}

.form__row {
  margin-bottom: var(--space-lg);
}

.form__row label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--text);
}

.form__row input,
.form__row textarea {
  width: 100%;
  padding: var(--space-md);
  font-family: inherit;
  font-size: var(--text-base);
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04);
  transition: border-color var(--transition);
}

.form__row input::placeholder,
.form__row textarea::placeholder {
  color: var(--text-dim);
}

.form__row input:focus,
.form__row textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form__row textarea {
  resize: vertical;
  min-height: 120px;
}

.contact__form .btn {
  margin-top: var(--space-sm);
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  max-width: calc(100% - 2rem);
  padding: var(--space-md) var(--space-xl);
  background: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  transition: transform 0.3s ease;
}

.toast.is-visible {
  transform: translateX(-50%) translateY(0);
}

.toast p {
  font-size: var(--text-sm);
  color: var(--bg);
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  text-align: center;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: var(--text-lg);
}

.footer__logo {
  width: 1.75rem;
  height: 1.75rem;
}

.footer__social {
  display: flex;
  gap: var(--space-md);
}

.footer__social-link {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: var(--text-xs);
  font-weight: 600;
}

.footer__social-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--text-dim);
}

@media (min-width: 640px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}