/* =============================================
   KÜSTEN-IoT — styles.css
   Theme: Coastal Engineering — clean, robust, trustworthy
   ============================================= */

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

:root {
  --blue-deep:    #0d2d44;
  --blue-mid:     #1a7fbf;
  --blue-light:   #4fa8d6;
  --blue-pale:    #e8f4fb;
  --teal:         #1aaa8f;
  --sand:         #f5efe6;
  --sand-dark:    #e8ddd0;
  --text:         #1a2a38;
  --text-muted:   #5a6e7f;
  --white:        #ffffff;
  --bg-alt:       #f8f9fb;
  --radius:       12px;
  --radius-sm:    8px;
  --shadow-sm:    0 2px 8px rgba(13,45,68,.08);
  --shadow-md:    0 6px 24px rgba(13,45,68,.12);
  --shadow-lg:    0 16px 48px rgba(13,45,68,.18);
  --transition:   0.25s ease;
  --max-w:        1160px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

/* ── UTILITIES ─────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), box-shadow var(--transition),
              transform var(--transition);
}
.btn:hover { transform: translateY(-1px); }

.btn--primary {
  background: var(--blue-mid);
  color: var(--white);
  border-color: var(--blue-mid);
}
.btn--primary:hover {
  background: var(--blue-deep);
  border-color: var(--blue-deep);
  box-shadow: 0 4px 16px rgba(26,127,191,.35);
}

.btn--outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.6);
}
.btn--outline:hover {
  background: rgba(255,255,255,.12);
  border-color: var(--white);
}

.btn--nav {
  background: var(--blue-mid);
  color: var(--white);
  padding: 9px 20px;
  font-size: 0.88rem;
}
.btn--nav:hover { background: var(--blue-deep); }

.btn--full { width: 100%; text-align: center; }

.badge {
  display: inline-block;
  background: rgba(255,255,255,.15);
  color: var(--white);
  border: 1px solid rgba(255,255,255,.3);
  padding: 5px 14px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

/* ── NAVIGATION ────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(13,45,68,.08);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--blue-deep);
  text-decoration: none;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav__links a {
  text-decoration: none;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}
.nav__links a:hover { color: var(--blue-mid); }

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--blue-deep);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav__hamburger--open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger--open span:nth-child(2) { opacity: 0; }
.nav__hamburger--open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── HERO ──────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background:
    linear-gradient(160deg, var(--blue-deep) 0%, #0e4a6e 55%, #1a7fbf 100%);
  overflow: hidden;
  padding-top: 64px;
}

.hero__bg-overlay {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 80% 20%, rgba(26,127,191,.25) 0%, transparent 50%),
    radial-gradient(circle at 15% 80%, rgba(26,170,143,.12) 0%, transparent 40%);
  pointer-events: none;
}

/* subtle topographic lines */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 59px,
      rgba(255,255,255,.03) 60px
    );
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  padding-block: 100px 120px;
  max-width: 760px;
}

.hero__headline {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero__sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(255,255,255,.82);
  max-width: 580px;
  margin-bottom: 36px;
}

.hero__cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.hero__stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.stat__num {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1.1;
}

.stat__label {
  font-size: 0.8rem;
  color: rgba(255,255,255,.65);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hero__wave {
  position: absolute;
  bottom: -1px; left: 0; right: 0;
}
.hero__wave svg { display: block; width: 100%; height: 80px; }

/* ── SECTIONS ──────────────────────────────── */
.section {
  padding-block: 96px;
}
.section--alt {
  background: var(--bg-alt);
}

.section__eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-mid);
  margin-bottom: 10px;
}

.section__title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 800;
  color: var(--blue-deep);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section__intro {
  font-size: 1.08rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 56px;
}

/* ── PAIN CARDS ────────────────────────────── */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.pain-card {
  background: var(--white);
  border: 1px solid rgba(13,45,68,.08);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.pain-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.pain-card__icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.pain-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--blue-deep);
  margin-bottom: 10px;
}

.pain-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── PACKAGES ──────────────────────────────── */
.packages {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
  align-items: start;
}

.package-card {
  background: var(--white);
  border: 1px solid rgba(13,45,68,.1);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 24px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.package-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.package-card--featured {
  background: var(--blue-deep);
  border-color: var(--blue-deep);
  color: var(--white);
  box-shadow: var(--shadow-lg);
  transform: scale(1.02);
}
.package-card--featured:hover { transform: scale(1.02) translateY(-3px); }

.package-card__header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blue-deep);
  margin-top: 8px;
}
.package-card--featured .package-card__header h3 { color: var(--white); }

.package-badge {
  display: inline-block;
  background: var(--blue-pale);
  color: var(--blue-mid);
  padding: 3px 12px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.package-badge--featured {
  background: var(--teal);
  color: var(--white);
}

.package-card__features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.package-card__features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text);
}
.package-card--featured .package-card__features li { color: rgba(255,255,255,.88); }

.check {
  color: var(--teal);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}
.package-card--featured .check { color: #4eefd8; }

.package-card__callout {
  background: var(--blue-pale);
  border-left: 3px solid var(--blue-mid);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 12px 16px;
  font-size: 0.88rem;
  color: var(--text);
}
.package-card--featured .package-card__callout {
  background: rgba(255,255,255,.1);
  border-left-color: #4eefd8;
  color: rgba(255,255,255,.9);
}
.package-card__callout strong { color: var(--blue-mid); }
.package-card--featured .package-card__callout strong { color: #4eefd8; }

/* ── USP GRID ──────────────────────────────── */
.usp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}

.usp-item {
  padding: 32px 28px;
  border-radius: var(--radius);
  border: 1px solid rgba(13,45,68,.08);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.usp-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.usp-item__icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.usp-item h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--blue-deep);
  margin-bottom: 10px;
}

.usp-item p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── STEPS ─────────────────────────────────── */
.steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  flex-wrap: wrap;
}

.step {
  flex: 1;
  min-width: 200px;
  padding: 32px 28px;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid rgba(13,45,68,.08);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.step:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.step__num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--blue-light);
  opacity: .35;
  line-height: 1;
  margin-bottom: 12px;
  font-variant-numeric: tabular-nums;
}

.step h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--blue-deep);
  margin-bottom: 10px;
}

.step p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.step__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--blue-light);
  padding: 0 16px;
  padding-top: 32px;
  opacity: .5;
  flex-shrink: 0;
}

/* ── CONTACT ───────────────────────────────── */
.contact {
  background: linear-gradient(160deg, var(--blue-deep) 0%, #0e4a6e 100%);
}
.contact .section__eyebrow { color: var(--blue-light); }
.contact .section__title { color: var(--white); }
.contact .section__intro { color: rgba(255,255,255,.75); }

.contact__layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: start;
}

.contact__block {
  margin-bottom: 32px;
}
.contact__block h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}
.contact__block p {
  font-size: 0.9rem;
  color: rgba(255,255,255,.7);
  line-height: 1.6;
}

/* FORM */
.contact__form {
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px 36px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue-deep);
}

.form-row input,
.form-row select,
.form-row textarea {
  padding: 11px 14px;
  border: 1.5px solid rgba(13,45,68,.18);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  border-color: var(--blue-mid);
  box-shadow: 0 0 0 3px rgba(26,127,191,.15);
}
.form-row textarea { resize: vertical; min-height: 100px; }

.form__privacy {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
}

/* ── FOOTER ────────────────────────────────── */
.footer {
  background: var(--blue-deep);
  padding-top: 56px;
}

.footer__inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.footer__brand .nav__logo {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.footer__brand p {
  font-size: 0.88rem;
  color: rgba(255,255,255,.55);
  max-width: 280px;
}

.footer__links,
.footer__legal {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__links a,
.footer__legal a {
  font-size: 0.88rem;
  color: rgba(255,255,255,.6);
  text-decoration: none;
  transition: color var(--transition);
}
.footer__links a:hover,
.footer__legal a:hover { color: var(--white); }

.footer__bottom {
  padding-block: 20px;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,.35);
}

/* ── SCROLL ANIMATIONS ─────────────────────── */
.animate {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.animate.visible {
  opacity: 1;
  transform: translateY(0);
}

.pain-card:nth-child(2).animate  { transition-delay: 0.08s; }
.pain-card:nth-child(3).animate  { transition-delay: 0.16s; }
.pain-card:nth-child(4).animate  { transition-delay: 0.24s; }

.package-card:nth-child(2).animate { transition-delay: 0.1s; }
.package-card:nth-child(3).animate { transition-delay: 0.2s; }

.usp-item:nth-child(2).animate { transition-delay: 0.08s; }
.usp-item:nth-child(3).animate { transition-delay: 0.16s; }
.usp-item:nth-child(4).animate { transition-delay: 0.24s; }

.step:nth-child(3).animate { transition-delay: 0.1s; }
.step:nth-child(5).animate { transition-delay: 0.2s; }

/* ── RESPONSIVE ────────────────────────────── */
@media (max-width: 900px) {
  .nav__links { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--white); padding: 20px 24px 28px; gap: 18px; border-bottom: 1px solid rgba(13,45,68,.1); box-shadow: var(--shadow-md); }
  .nav__links--open { display: flex; }
  .nav__hamburger { display: flex; }
  .hero__cta { flex-direction: column; align-items: flex-start; }
  .contact__layout { grid-template-columns: 1fr; gap: 40px; }
  .steps { flex-direction: column; }
  .step__arrow { display: none; }
}

@media (max-width: 600px) {
  .section { padding-block: 64px; }
  .hero__content { padding-block: 80px 100px; }
  .packages { grid-template-columns: 1fr; }
  .package-card--featured { transform: none; }
  .hero__stats { gap: 28px; }
  .contact__form { padding: 28px 22px; }
  .footer__inner { flex-direction: column; gap: 28px; }
}