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

body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f0f2f5;
  color: #333;
  min-height: 100vh;
}

/* ==== NO SCROLL ON MOBILE ==== */
@media (max-width: 600px) {
  body.no-scroll {
    overflow: hidden;
    height: 100vh;
    position: fixed;
    width: 100%;
  }
}

/* ==== LOGIN PAGE ==== */
.login-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  padding: 20px;
}

.login-box {
  background: white;
  padding: 30px 25px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 420px;
  text-align: center;
}

.login-box h1 {
  font-size: 26px;
  margin-bottom: 24px;
  color: #333;
  font-weight: bold;
}

.login-box input {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 16px;
  font-size: 16px;
  border: 1px solid #ccc;
  border-radius: 8px;
}

.login-box button {
  padding: 12px 14px;
  font-size: 16px;
  font-weight: bold;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

.login-box button:hover {
  background-color: #0056b3;
}

.error-message {
  margin-top: 10px;
  color: red;
  font-size: 14px;
}

/* ==== MAIN PAGE ==== */
.main-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 16px 80px;
}

.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.main-header h1 {
  font-size: 22px;
  font-weight: bold;
  display: flex;
  align-items: center;
  gap: 8px;
}

.main-header select {
  padding: 8px 12px;
  font-size: 14px;
  border-radius: 6px;
}

#logoutBtn {
  padding: 8px 12px;
  background: #dc3545;
  color: white;
  font-weight: bold;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

#logoutBtn:hover {
  background-color: #c82333;
}

/* ==== FILE LIST ==== */
.file-list {
  background: white;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  padding: 16px 20px;
}

.file-card {
  display: flex;
  align-items: center;
  border-bottom: 1px solid #eee;
  padding: 12px 8px;
  gap: 16px;
}

.file-card:last-child {
  border-bottom: none;
}

.file-info {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.file-name {
  font-weight: bold;
  font-size: 16px;
  word-break: break-word;
}

.file-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: #666;
}

.download-btn {
  background-color: #007bff;
  border: none;
  color: white;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  white-space: nowrap;
}

.download-btn:hover {
  background-color: #0056b3;
}

/* ==== GROUP HEADER ==== */
.file-group-header {
  font-size: 18px;
  font-weight: bold;
  margin: 20px 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.file-icon {
  width: 20px;
  height: 20px;
  margin-right: 6px;
}

/* ==== PAGINATION ==== */
.pagination {
  position: fixed;
  bottom: 12px;
  left: 0;
  width: 100%;
  text-align: center;
  background: #f0f2f5;
  padding: 10px;
}

.pagination button {
  padding: 6px 10px;
  font-size: 14px;
  margin: 0 8px;
  border-radius: 6px;
  background: #007bff;
  color: white;
  border: none;
  cursor: pointer;
}

.pagination button:disabled {
  background: #ccc;
  cursor: not-allowed;
}

#pageInfo {
  font-size: 14px;
  margin: 0 10px;
}

/* ==== MOBILE VIEW: CHUYỂN SANG 2 DÒNG ==== */
@media (max-width: 600px) {
  .file-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .file-info {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 6px;
  }

  .file-meta {
    width: 100%;
    justify-content: space-between;
  }

  .download-btn {
    margin-left: auto;
  }
}