/* =====================
   ROOT & RESET
===================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --green: #007a4d;
  --dark-green: #005a38;
  --gold: #ffd700;
  --light: #f5f7f5;
  --white: #ffffff;
  --text: #222222;
  --subtext: #666666;
  --border: #dddddd;
  --error: #e53e3e;
  --success: #38a169;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--light);
  color: var(--text);
}

/* =====================
   HEADER
===================== */
header {
  background: var(--green);
  padding: 16px 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-waec {
  background: var(--gold);
  color: var(--dark-green);
  font-weight: 900;
  font-size: 20px;
  padding: 4px 10px;
  border-radius: 4px;
}

.logo-pin {
  color: var(--white);
  font-size: 18px;
  font-weight: 600;
}

nav a {
  color: var(--white);
  text-decoration: none;
  margin-left: 24px;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--gold);
}

/* =====================
   HERO
===================== */
.hero {
  background: linear-gradient(135deg, var(--green), var(--dark-green));
  color: var(--white);
  padding: 80px 24px;
  text-align: center;
}

.hero-inner {
  max-width: 700px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero p {
  font-size: 18px;
  margin-bottom: 32px;
  opacity: 0.9;
}

/* =====================
   BUTTONS
===================== */
.btn-primary {
  background: var(--gold);
  color: var(--dark-green);
  padding: 14px 32px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.btn-secondary {
  background: var(--green);
  color: var(--white);
  padding: 14px 32px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.full-width {
  width: 100%;
  margin-top: 16px;
}

/* =====================
   SECTIONS
===================== */
.section {
  padding: 64px 24px;
}

.section.alt {
  background: var(--white);
}

.container {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.section h2 {
  font-size: 28px;
  font-weight: 800;
  color: var(--dark-green);
  margin-bottom: 8px;
}

.section-sub {
  color: var(--subtext);
  margin-bottom: 32px;
  font-size: 16px;
}

/* =====================
   CARD
===================== */
.card {
  background: var(--white);
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  text-align: left;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  transition: border 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--green);
}

.price-tag {
  background: var(--light);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--subtext);
}

.price-tag strong {
  color: var(--dark-green);
  font-size: 20px;
}

/* =====================
   MESSAGES
===================== */
.message {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 15px;
  display: none;
}

.message.success {
  background: #f0fff4;
  color: var(--success);
  border: 1px solid var(--success);
  display: block;
}

.message.error {
  background: #fff5f5;
  color: var(--error);
  border: 1px solid var(--error);
  display: block;
}

/* =====================
   PIN RESULTS
===================== */
#pin-results {
  margin-top: 16px;
}

.pin-card {
  background: var(--light);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-top: 12px;
  text-align: left;
}

.pin-card h4 {
  color: var(--dark-green);
  margin-bottom: 8px;
}

.pin-number {
  font-size: 13px;
  color: var(--subtext);
  margin-top: 4px;
}

.pin-serial {
  font-size: 13px;
  color: var(--subtext);
  margin-top: 4px;
}

/* =====================
   USSD SECTION
===================== */
.ussd-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.ussd-card {
  background: var(--white);
  border-radius: 12px;
  padding: 24px 16px;
  text-align: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.network {
  font-weight: 800;
  font-size: 16px;
  padding: 6px 12px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 12px;
}

.mtn { background: #ffcc00; color: #000; }
.vodafone { background: #e60000; color: #fff; }
.airteltigo { background: #0057a8; color: #fff; }

.ussd-code {
  font-size: 28px;
  font-weight: 900;
  color: var(--dark-green);
  margin-bottom: 8px;
}

.ussd-card p {
  font-size: 13px;
  color: var(--subtext);
}

/* =====================
   FOOTER
===================== */
footer {
  background: var(--dark-green);
  color: var(--white);
  text-align: center;
  padding: 32px 24px;
  font-size: 14px;
  line-height: 2;
}

/* =====================
   RESPONSIVE
===================== */
@media (max-width: 600px) {
  .hero h1 { font-size: 26px; }
  nav a { margin-left: 12px; font-size: 13px; }
  .card { padding: 20px; }
}
/* =====================
   SELECT DROPDOWNS
===================== */
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  background: var(--white);
  color: var(--text);
  cursor: pointer;
  transition: border 0.2s;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
}

.form-group select:focus {
  outline: none;
  border-color: var(--green);
}