/* ============================================================
   Bookstore Microservices - Stylesheet
   ============================================================ */

:root {
  --color-primary: #4f46e5;
  --color-primary-dark: #4338ca;
  --color-primary-soft: #eef2ff;
  --color-accent: #f59e0b;
  --color-bg: #f6f7fb;
  --color-surface: #ffffff;
  --color-text: #1f2937;
  --color-text-soft: #6b7280;
  --color-border: #e5e7eb;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-shadow: rgba(15, 23, 42, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --font-stack: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  font-family: var(--font-stack);
  background:
    linear-gradient(180deg, #eef2ff 0%, var(--color-bg) 30%);
  background-attachment: fixed;
  color: var(--color-text);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- Navigation ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  background: var(--color-primary);
  color: #fff;
  padding: 0.9rem 1.5rem;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.25);
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
}

.brand-ico {
  font-size: 1.3rem;
}

.navbar-links {
  display: flex;
  gap: 0.35rem;
  margin-left: auto;
  flex-wrap: wrap;
}

.navbar-links a {
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}

.navbar-links a:hover {
  background: rgba(255, 255, 255, 0.16);
}

.navbar-links a.active {
  background: #fff;
  color: var(--color-primary-dark);
}

.navbar-toggle {
  display: none;
  margin-left: auto;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.7rem;
  cursor: pointer;
}

.navbar-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: #fff;
  margin: 3px;
  border-radius: 2px;
}

/* ---------- Layout helpers ---------- */
main.container {
  flex: 1 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  max-width: 1100px;
  margin: 0 auto;
}

.hero {
  background: linear-gradient(120deg, var(--color-primary) 0%, var(--color-accent) 130%);
  color: #fff;
  border-radius: var(--radius);
  padding: 2.2rem 2rem;
  box-shadow: 0 10px 24px var(--color-shadow);
  margin-bottom: 2rem;
}

.hero h1 {
  margin: 0 0 0.4rem;
  font-size: 1.9rem;
}

.hero p {
  margin: 0 0 1.2rem;
  font-size: 1.05rem;
  opacity: 0.92;
}

.page-header {
  margin-bottom: 1.75rem;
}

.page-header h1 {
  font-size: 1.7rem;
  margin: 0 0 0.2rem;
  color: var(--color-primary-dark);
}

.page-header p {
  margin: 0;
  color: var(--color-text-soft);
}

/* ---------- Cards / stats ---------- */
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  flex: 1 1 190px;
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.1rem 1rem;
  box-shadow: 0 5px 14px var(--color-shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

a.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 22px var(--color-shadow);
}

.stat-num {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  line-height: 1;
}

.stat-label {
  margin-top: 0.4rem;
  color: var(--color-text-soft);
  font-size: 0.9rem;
}

.content-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.4rem 1.4rem;
  box-shadow: 0 5px 14px var(--color-shadow);
  margin-bottom: 1.5rem;
}

.content-card h2 {
  font-size: 1.25rem;
  margin: 0 0 0.9rem;
  color: var(--color-primary-dark);
}

/* ---------- Quick links grid ---------- */
.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.2rem;
}

.link-card {
  text-decoration: none;
  background: linear-gradient(160deg, #fff 0%, #f0f3ff 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.3rem 1.1rem;
  box-shadow: 0 5px 14px var(--color-shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.link-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 22px var(--color-shadow);
  border-color: var(--color-primary);
}

.link-card h3 {
  margin: 0 0 0.4rem;
  color: var(--color-primary-dark);
}

.link-card p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 0.92rem;
}

/* ---------- Tables ---------- */
.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  font-size: 0.95rem;
}

.table th {
  text-align: left;
  padding: 0.7rem 0.8rem;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-weight: 600;
  border-bottom: 2px solid var(--color-primary);
}

.table td {
  padding: 0.7rem 0.8rem;
  border-bottom: 1px solid var(--color-border);
}

.table tbody tr:hover {
  background: var(--color-primary-soft);
}

.table td.align-right {
  text-align: right;
  font-weight: 700;
  color: var(--color-success);
}

/* ---------- Badges / chips ---------- */
.badge {
  display: inline-block;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-size: 0.78rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  font-family: "SFMono-Regular", Consolas, monospace;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  text-decoration: none;
  color: var(--color-primary-dark);
  background: var(--color-primary-soft);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.82rem;
}

.chip:hover {
  background: var(--color-primary);
  color: #fff;
}

.empty {
  color: var(--color-text-soft);
  font-style: italic;
}

/* ---------- Forms ---------- */
.form {
  display: grid;
  gap: 1rem;
}

.form-field {
  display: grid;
  gap: 0.35rem;
}

.form-field label {
  font-weight: 600;
  color: var(--color-text);
}

.form-field input,
.form-field select {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-field input:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

/* ---------- Error page ---------- */
.error-page .content-card h1 {
  color: var(--color-danger);
}

.error-stack {
  max-height: 260px;
  overflow: auto;
  background: #1f2937;
  color: #e5e7eb;
  border-radius: var(--radius-sm);
  padding: 0.8rem;
  font-size: 0.8rem;
}

/* ---------- Footer ---------- */
.footer {
  margin-top: auto;
  text-align: center;
  padding: 1rem 1rem;
  color: var(--color-text-soft);
  background: #eef2ff;
  border-top: 1px solid var(--color-border);
  font-size: 0.88rem;
}

.footer a {
  color: var(--color-primary-dark);
  text-decoration: none;
}

.footer-meta {
  font-size: 0.78rem;
  opacity: 0.8;
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .navbar-links {
    display: none;
  }

  .navbar-toggle {
    display: block;
  }

  .navbar-links.open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    margin: 0;
    background: var(--color-primary-dark);
  }

  .navbar-links.open a {
    text-align: center;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .table {
    font-size: 0.85rem;
  }

  .table th,
  .table td {
    padding: 0.5rem 0.6rem;
  }
}

@media (max-width: 460px) {
  .stat-card {
    flex: 1 1 140px;
  }
}