:root {
  --primary-color: #ff0000;
  --secondary-color: #282828;
  --accent-color: #ffffff;
  --text-color: #333333;
  --light-gray: #f5f5f5;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: var(--light-gray);
  color: var(--text-color);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  flex: 1;
}

/* Header Styles */
.main-header {
  background-color: white;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.logo {
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  font-size: 2rem;
}

.main-nav {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: var(--secondary-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
  padding: 0.5rem 0;
  position: relative;
}

.nav-link:hover {
  color: var(--primary-color);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width 0.3s;
}

.nav-link:hover::after {
  width: 100%;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--secondary-color);
}

/* Main Content Styles */
.tagline {
  font-size: 1.2rem;
  color: var(--secondary-color);
  opacity: 0.8;
  text-align: center;
  margin-bottom: 2rem;
}

.main-content {
  background-color: white;
  border-radius: 10px;
  padding: 2rem;
  box-shadow: var(--shadow);
  margin-top: 1rem;
}

.input-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.url-input {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

label {
  font-weight: 600;
  color: var(--secondary-color);
}

input[type="text"] {
  padding: 1rem;
  border: 2px solid #ddd;
  border-radius: 5px;
  font-size: 1rem;
  transition: border 0.3s;
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--primary-color);
}

.btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 1rem 2rem;
  border-radius: 5px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.2s;
  display: inline-block;
  text-align: center;
}

.btn:hover {
  background-color: #cc0000;
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.result-section {
  display: none;
  margin-top: 2rem;
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.thumbnail-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.thumbnail-item {
  border: 1px solid #eee;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}

.thumbnail-item:hover {
  transform: scale(1.02);
}

.thumbnail-img {
  width: 100%;
  height: auto;
  display: block;
}

.thumbnail-info {
  padding: 1rem;
  background-color: white;
}

.thumbnail-quality {
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--secondary-color);
}

.thumbnail-dimensions {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.download-btn {
  width: 100%;
}

.error-message {
  color: #d32f2f;
  background-color: #fde8e8;
  padding: 1rem;
  border-radius: 5px;
  margin-top: 1rem;
  display: none;
}

.loading {
  display: none;
  text-align: center;
  margin: 2rem 0;
}

.spinner {
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-radius: 50%;
  border-top: 4px solid var(--primary-color);
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Footer Styles */
.main-footer {
  background-color: var(--secondary-color);
  color: white;
  padding: 2rem 0;
  margin-top: 3rem;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  padding: 0 2rem;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--accent-color);
  margin-bottom: 1rem;
  display: inline-block;
}

.footer-about {
  margin-bottom: 1rem;
  color: #aaa;
}

.footer-links h3 {
  color: var(--accent-color);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: #aaa;
  text-decoration: none;
  transition: color 0.3s;
}

.footer-links a:hover {
  color: var(--accent-color);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid #444;
  color: #aaa;
  font-size: 0.9rem;
}

/* Responsive Styles */
@media (max-width: 768px) {
  .header-container {
    padding: 1rem;
  }

  .main-nav {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: white;
    flex-direction: column;
    align-items: center;
    padding: 1rem 0;
    gap: 1rem;
    box-shadow: var(--shadow);
    transform: translateY(-150%);
    transition: transform 0.3s ease-in-out;
    z-index: 99;
  }

  .main-nav.active {
    transform: translateY(0);
  }

  .mobile-menu-btn {
    display: block;
  }

  .container {
    padding: 1rem;
  }

  .main-content {
    padding: 1.5rem;
  }

  .thumbnail-container {
    grid-template-columns: 1fr;
  }

  .footer-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-links {
    margin-top: 1rem;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.5rem;
  }

  .btn {
    padding: 0.8rem 1.5rem;
  }
}