/* =========================
   VARIABLES
========================= */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;

  --text-dark: #0f172a;
  --text-light: #475569;

  --border-light: #e5e7eb;
  --bg-light: #f8fafc;

  --radius: 12px;
  --max-width: 1200px;
}

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

body {
  font-family: Inter, system-ui, -apple-system, sans-serif;
  color: var(--text-dark);
  background: transparent;
}

img {
  max-width: 100%;
  display: block;
}

/* =========================
   PAGE HERO
========================= */
.page-hero {
  text-align: center;
  padding: 70px 24px 50px;
  background: transparent;
}

.page-hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.page-hero p {
  color: var(--text-light);
  max-width: 600px;
  margin: auto;
  font-size: 1.05rem;
}

/* =========================
   FILTER BAR
========================= */
.filter-bar {
  max-width: var(--max-width);
  margin: 30px auto 20px;
  padding: 0 24px;

  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.filter-bar select {
  padding: 12px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  font-size: 0.95rem;
  background: #ffffff;
  cursor: pointer;
}

/* =========================
   EBOOK GRID
========================= */
.ebook-container {
  max-width: var(--max-width);
  margin: auto;
  padding: 40px 24px 80px;
}

.ebook-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

/* =========================
   EBOOK CARD
========================= */
.ebook-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;

  display: flex;
  flex-direction: column;

  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.ebook-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.1);
}

.ebook-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: var(--bg-light);
}

/* =========================
   CARD CONTENT
========================= */
.ebook-info {
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.ebook-info h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.ebook-desc {
  font-size: 0.95rem;
  color: var(--text-light);
  margin-bottom: 16px;
  flex-grow: 1;
}

/* =========================
   META
========================= */
.ebook-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.ebook-price {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
}

.ebook-tag {
  background: #eef2ff;
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}

/* =========================
   ACTION BUTTONS
========================= */
.ebook-btn {
  border: none;
  padding: 12px;
  border-radius: var(--radius);
  background: var(--primary);
  color: #ffffff;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.1s ease;
}

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

.ebook-btn:active {
  transform: scale(0.98);
}

.ebook-actions {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

.delete-btn {
  background: #ef4444;
  color: #ffffff;
  border: none;
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
}

.delete-btn:hover {
  background: #dc2626;
}

/* =========================
   ADMIN UPLOAD SECTION
========================= */
.admin-upload {
  max-width: 600px;
  margin: 60px auto;
  padding: 32px 28px;

  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.08);
}

.admin-upload h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 24px;
  text-align: center;
}

.admin-upload input {
  width: 100%;
  padding: 14px 16px;
  margin-bottom: 14px;

  font-size: 0.95rem;
  border-radius: 10px;
  border: 1px solid var(--border-light);
  background: #ffffff;

  transition: border-color 0.2s, box-shadow 0.2s;
}

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

.admin-upload input[type="file"] {
  padding: 10px;
  background: var(--bg-light);
  cursor: pointer;
}

.admin-upload button {
  width: 100%;
  margin-top: 10px;
  padding: 14px;

  border-radius: 10px;
  border: none;

  background: var(--primary);
  color: #ffffff;

  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;

  transition: background 0.2s ease, transform 0.1s ease;
}

.admin-upload button:hover {
  background: var(--primary-dark);
}

.admin-upload button:active {
  transform: scale(0.98);
}

/* =========================
   FOOTER (MINIMAL)
========================= */
.footer {
  background: #020617;
  color: #cbd5f5;
  padding: 30px 20px;
  text-align: center;
  font-size: 0.9rem;
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 600px) {
  .page-hero h1 {
    font-size: 2rem;
  }

  .ebook-card img {
    height: 190px;
  }
}

@media (max-width: 480px) {
  .admin-upload {
    padding: 26px 20px;
  }

  .admin-upload h2 {
    font-size: 1.4rem;
  }
}