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

:root {
  --bg: #111827;
  --bg-card: #1f2937;
  --bg-input: #1a2332;
  --text: #f9fafb;
  --text-muted: #9ca3af;
  --accent: #f97316;
  --accent-hover: #ea580c;
  --border: #374151;
  --radius: 8px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Hero ===== */
#hero {
  padding: 100px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, #0c1220 0%, var(--bg) 100%);
}

#hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  line-height: 1.15;
}

.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 36px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  font-family: inherit;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius);
  transition: background 0.2s, transform 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  padding: 14px 32px;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* ===== What We Buy ===== */
#what-we-buy {
  padding: 80px 0;
}

#what-we-buy h2,
#submit h2,
#about h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: border-color 0.2s;
}

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

.card-icon {
  color: var(--accent);
  margin-bottom: 16px;
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ===== Form Section ===== */
#submit {
  padding: 80px 0;
  background: var(--bg-card);
}

.section-sub {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 40px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

label {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.required {
  color: var(--accent);
}

input,
select,
textarea {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 12px 14px;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.2s;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
}

input::placeholder,
textarea::placeholder {
  color: #6b7280;
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239ca3af' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

select option {
  background: var(--bg);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

.btn-submit {
  display: block;
  width: 100%;
  margin-top: 28px;
  padding: 16px;
  font-size: 1.05rem;
}

/* Form Messages */
.form-message {
  margin-top: 20px;
  padding: 16px;
  border-radius: var(--radius);
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #4ade80;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
}

.form-message-error {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: #f87171;
}

/* ===== About ===== */
#about {
  padding: 80px 0;
  text-align: center;
}

#about p {
  color: var(--text-muted);
  max-width: 640px;
  margin: 20px auto 0;
  font-size: 1.05rem;
  line-height: 1.7;
}

/* ===== Footer ===== */
footer {
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--border);
}

footer p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-copy {
  margin-top: 6px;
  font-size: 0.8rem;
  color: #6b7280;
}

/* ===== Loading State ===== */
.btn-loading {
  opacity: 0.7;
  pointer-events: none;
}

/* ===== Error Highlight ===== */
input.input-error {
  border-color: #ef4444;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  #hero {
    padding: 72px 0 56px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .form-group.full-width {
    grid-column: 1;
  }

  #what-we-buy,
  #submit,
  #about {
    padding: 56px 0;
  }
}