:root {
  --bg: #f6f8fc;
  --bg-soft: #eef3fb;
  --panel: #ffffff;
  --panel-soft: #f9fbff;
  --text: #122033;
  --muted: #66758f;
  --blue: #2563eb;
  --blue-soft: #4f8cff;
  --yellow: #f4b400;
  --yellow-soft: #fff4cc;
  --border: #dfe7f3;
  --shadow: 0 12px 30px rgba(17, 24, 39, 0.08);
  --radius: 20px;
  --success-bg: #ecfdf3;
  --success-border: #b7e4c7;
  --success-text: #15803d;
  --error-bg: #fef2f2;
  --error-border: #fecaca;
  --error-text: #b91c1c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background:
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 22%),
    linear-gradient(180deg, #f9fbff 0%, #f4f7fc 100%);
  color: var(--text);
}

a {
  text-decoration: none;
  color: inherit;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 42px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand-main {
  color: #111827;
}

.brand-accent {
  color: var(--blue);
}

.nav-links {
  display: flex;
  gap: 20px;
  align-items: center;
}

.nav-links a {
  color: var(--muted);
  font-weight: 600;
}

.nav-links a:hover {
  color: var(--blue);
}

.hero-wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 72px 28px 36px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
}

.tag {
  display: inline-block;
  background: #eaf1ff;
  color: var(--blue);
  border: 1px solid #cfe0ff;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  margin-bottom: 18px;
}

.hero-left h1 {
  font-size: 54px;
  line-height: 1.05;
  margin: 0 0 16px;
  max-width: 700px;
  color: #0f172a;
}

.hero-left p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
  max-width: 680px;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 13px 20px;
  border-radius: 14px;
  font-weight: 800;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-soft) 100%);
  color: white;
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.18);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text);
  border: 1px solid var(--border);
}

.hero-right {
  display: grid;
  gap: 18px;
}

.card,
.feature-card,
.admin-card,
.auth-card {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-soft) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.stat-card {
  padding: 24px;
}

.stat-card .label {
  color: var(--muted);
  margin-bottom: 10px;
}

.stat-card h2 {
  margin: 0;
  font-size: 34px;
  color: #111827;
}

.highlight {
  border-color: #d9c46b;
  background: linear-gradient(180deg, #fffdfa 0%, #fff8e8 100%);
}

.features {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 28px 70px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature-card {
  padding: 24px;
}

.feature-card h3 {
  margin-top: 0;
  margin-bottom: 10px;
  color: #111827;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.auth-page {
  min-height: calc(100vh - 84px);
  display: grid;
  place-items: center;
  padding: 44px 20px;
}

.auth-card {
  width: 100%;
  max-width: 520px;
  padding: 34px;
}

.auth-card h1 {
  margin: 0 0 10px 0;
  font-size: 38px;
  color: #111827;
}

.auth-subtext {
  margin: 0 0 24px 0;
  color: var(--muted);
  line-height: 1.8;
}

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

.auth-form label {
  margin-top: 10px;
  font-weight: 700;
  color: #1f2937;
}

.auth-form input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: #111827;
  outline: none;
  font-size: 15px;
}

.auth-form input::placeholder {
  color: #94a3b8;
}

.auth-form input:focus {
  border-color: #93c5fd;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.auth-btn {
  margin-top: 18px;
  width: 100%;
}

.flash {
  margin: 16px 0;
  padding: 14px 16px;
  border-radius: 14px;
  font-weight: 700;
}

.flash.success {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

.flash.error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-text);
}

.admin-body {
  min-height: 100vh;
}

.admin-wrapper {
  max-width: 1120px;
  margin: 0 auto;
  padding: 46px 28px 70px;
}

.admin-panel {
  background: linear-gradient(180deg, #ffffff 0%, #f9fbff 100%);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 34px;
  box-shadow: var(--shadow);
}

.admin-panel h1 {
  margin-top: 0;
  font-size: 40px;
  color: #111827;
}

.admin-panel p {
  color: var(--muted);
  line-height: 1.8;
}

.admin-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.admin-card {
  padding: 22px;
}

.admin-card h3 {
  margin-top: 0;
  margin-bottom: 10px;
  color: #111827;
}

.mono {
  font-family: "Courier New", monospace;
  color: var(--blue);
  word-break: break-word;
}

@media (max-width: 960px) {
  .hero-wrapper,
  .admin-grid,
  .features {
    grid-template-columns: 1fr;
  }

  .hero-left h1 {
    font-size: 42px;
  }

  .navbar {
    padding: 18px 20px;
    flex-direction: column;
    gap: 14px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .auth-card {
    padding: 24px;
  }

  .auth-card h1 {
    font-size: 30px;
  }

  .admin-panel h1 {
    font-size: 30px;
  }
}