:root {
  --deep-blue: #0b1e3f;
  --teal: #00b7b3;
  --slate-gray: #5a6b7a;
  --light-bg: #f9fafc;
  --gradient: linear-gradient(135deg, #0b1e3f, #00b7b3);
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Inter", sans-serif;
  background: var(--light-bg);
  color: var(--deep-blue);
  line-height: 1.6;
}

h1, h2, h3 {
  line-height: 1.2;
}

p {
  max-width: 720px;
  margin: 0 auto 1.5rem;
  font-size: 1.05rem;
  color: var(--slate-gray);
}

/* ---------- HEADER ---------- */

header {
  background: var(--gradient);
  color: #fff;
  text-align: center;
  padding: 6rem 2rem;
  position: relative;
  overflow: hidden;
}

header p {
  color: rgba(255, 255, 255, 0.9);
}

header::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.12), transparent 70%);
  pointer-events: none;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-btn {
  display: inline-block;
  background: #fff;
  color: var(--deep-blue);
  padding: 0.9rem 2.2rem;
  border-radius: 999px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.cta-btn:hover {
  background: var(--teal);
  color: #fff;
  transform: translateY(-2px);
}

/* ---------- SECTIONS ---------- */

section {
  padding: 4rem 2rem;
  text-align: center;
}

/* ---------- PROBLEM STRIP ---------- */

.problem-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  max-width: 1100px;
  margin: 0 auto;
}

.problem-card {
  background: #fff;
  padding: 1.4rem;
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.05);
  font-weight: 600;
}

/* ---------- SHIFT SECTION ---------- */

.shift {
  background: var(--deep-blue);
  color: #fff;
}

.shift p {
  color: rgba(255,255,255,0.85);
}

/* ---------- LAYERS ---------- */

.layers {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  max-width: 1100px;
  margin: 2rem auto 0;
  text-align: left;
}

.layer {
  background: #fff;
  padding: 2rem;
  border-radius: 14px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  transition: transform 0.2s ease;
}

.layer:hover {
  transform: translateY(-4px);
}

.layer h3 {
  color: var(--teal);
  margin-bottom: 0.6rem;
}

.layer ul {
  margin-top: 1rem;
  padding-left: 1.2rem;
}

.layer li {
  margin-bottom: 0.4rem;
  color: var(--slate-gray);
  font-size: 0.95rem;
}

/* ---------- FORM ---------- */

.form-section {
  background: var(--gradient);
  color: #fff;
}

.form-section p {
  color: rgba(255,255,255,0.9);
}

form {
  max-width: 520px;
  margin: 2rem auto 0;
  display: grid;
  gap: 1rem;
}

label {
  text-align: left;
  font-size: 0.9rem;
  opacity: 0.9;
}

input, textarea {
  padding: 0.85rem;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
}

input:focus, textarea:focus {
  outline: 2px solid var(--teal);
}

.submit-btn {
  margin-top: 1rem;
  background: #fff;
  color: var(--deep-blue);
  padding: 0.9rem;
  border-radius: 999px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.submit-btn:hover {
  background: var(--teal);
  color: #fff;
  transform: translateY(-2px);
}

/* ---------- FOOTER ---------- */

footer {
  background: var(--deep-blue);
  color: rgba(255,255,255,0.85);
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: 0.9rem;
}