:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --accent: #10b981;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Cairo', sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* الرأس */
.header {
  background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
  padding: 40px 0 20px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 8px;
}

.logo-icon {
  font-size: 2.2rem;
}

.logo h1 {
  font-size: 2.4rem;
  font-weight: 800;
  color: #38bdf8;
}

.tagline {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* البحث */
.search-section {
  padding: 30px 0;
}

.search-box {
  display: flex;
  max-width: 650px;
  margin: 0 auto;
  gap: 10px;
}

.search-box input {
  flex: 1;
  padding: 14px 20px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background-color: var(--card-bg);
  color: #fff;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

.search-box input:focus {
  border-color: #38bdf8;
}

.search-box button {
  padding: 14px 28px;
  background-color: var(--primary);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

.search-box button:hover {
  background-color: var(--primary-hover);
}

/* المحتوى وشبكة الكتب */
.main-content {
  flex: 1;
  padding-bottom: 50px;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 25px;
}

.section-title h2 {
  font-size: 1.5rem;
}

.badge {
  background-color: #334155;
  color: #38bdf8;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.9rem;
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 24px;
}

.book-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, box-shadow 0.2s;
}

.book-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  border-color: #38bdf8;
}

.book-icon {
  font-size: 3rem;
  text-align: center;
  margin-bottom: 15px;
}

.book-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}

.book-author {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
  flex: 1;
}

.download-btn {
  display: block;
  text-align: center;
  text-decoration: none;
  background-color: var(--accent);
  color: #fff;
  padding: 10px 15px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: opacity 0.2s;
}

.download-btn:hover {
  opacity: 0.9;
}

.empty-state {
  text-align: center;
  padding: 60px 0;
  color: var(--text-muted);
  font-size: 1.2rem;
}

.footer {
  text-align: center;
  padding: 25px;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.9rem;
}
/* أزرار ونموذج الرفع */
.upload-trigger-btn {
  margin-top: 15px;
  background-color: #0284c7;
  color: #fff;
  border: none;
  padding: 10px 22px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.2s;
}

.upload-trigger-btn:hover {
  background-color: #0369a1;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 25px;
  border-radius: 16px;
  width: 90%;
  max-width: 450px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.close-btn {
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--text-muted);
}

.form-group {
  margin-bottom: 15px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.form-group input {
  padding: 10px 12px;
  background: #0f172a;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: #fff;
}

.submit-btn {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 10px;
}

.upload-status {
  margin-top: 12px;
  text-align: center;
  font-size: 0.9rem;
}