:root {
  --primary-color-start: #000000;
  --primary-color-end: #0056b3;
  --hover-color-start: #0056b3;
  --hover-color-end: #003d80;
  --copy-btn-bg-start: #6c757d;
  --copy-btn-bg-end: #495057;
  --copy-btn-hover-start: #495057;
  --copy-btn-hover-end: #343a40;
  --btn-padding: 12px 24px;
  --btn-font-size: 16px;
  --btn-gap: 12px;
  --btn-border-radius: 12px;
  --btn-transition: background 0.25s ease, transform 0.15s ease;

  --favorite-bg-start: #000000;
  --favorite-bg-end: #1b343d;
  --favorite-hover-start: #1e7e34;
  --favorite-hover-end: #155d27;

  --bg-color: #f8f9fa;
  --text-color: #222;
  --input-border: #ccc;
  --modal-bg: #fff;
  --shadow-color: rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
  --primary-color-start: #3390ff;
  --primary-color-end: #0056b3;
  --hover-color-start: #0056b3;
  --hover-color-end: #003d80;
  --copy-btn-bg-start: #495057;
  --copy-btn-bg-end: #343a40;
  --copy-btn-hover-start: #343a40;
  --copy-btn-hover-end: #212529;

  --favorite-bg-start: #2c7a2c;
  --favorite-bg-end: #1c4d1c;
  --favorite-hover-start: #1c4d1c;
  --favorite-hover-end: #0f2c0f;

  --bg-color: #121212;
  --text-color: #eee;
  --input-border: #555;
  --modal-bg: #222;
  --shadow-color: rgba(0, 0, 0, 0.7);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.5;
  transition: background-color 0.3s ease, color 0.3s ease;
}

header {
  background: linear-gradient(45deg, var(--primary-color-start), var(--primary-color-end));
  color: white;
  padding: 15px 30px;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 3px 8px var(--shadow-color);
  font-weight: 700;
  font-size: 1.8rem;
  user-select: none;
}

#favoritesContainer {
  background: linear-gradient(45deg, var(--favorite-bg-start), var(--favorite-bg-end));
  padding: 14px 20px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  border-radius: var(--btn-border-radius);
  margin: 12px 20px;
  box-shadow: 0 4px 12px var(--shadow-color);
  scrollbar-width: thin;
  scrollbar-color: var(--favorite-hover-start) transparent;
  user-select: none;
}

#favoritesContainer::-webkit-scrollbar {
  height: 8px;
}

#favoritesContainer::-webkit-scrollbar-track {
  background: transparent;
}

#favoritesContainer::-webkit-scrollbar-thumb {
  background-color: var(--favorite-hover-start);
  border-radius: 10px;
}

#favoritesContainer button {
  background: transparent;
  border: none;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 700;
  color: white;
  cursor: pointer;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 14px;
  border-radius: var(--btn-border-radius);
  box-shadow: 0 4px 10px rgba(30, 126, 52, 0.7);
  transition: background 0.3s ease, transform 0.15s ease, box-shadow 0.3s ease;
  clip-path: polygon(
    15% 0%, 85% 0%, 
    100% 35%, 100% 65%, 
    85% 100%, 15% 100%, 
    0% 65%, 0% 35%
  );
  user-select: none;
  min-width: 120px;
  justify-content: center;
}

#favoritesContainer button:hover {
  background: linear-gradient(45deg, var(--favorite-hover-start), var(--favorite-hover-end));
  box-shadow: 0 8px 16px rgba(21, 93, 39, 0.85);
  transform: scale(1.08);
  outline-offset: 2px;
}

.container {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 24px 30px;
  max-width: 1200px;
  margin: 0 auto;
}

.tab-container {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.tab {
  padding: var(--btn-padding);
  background: linear-gradient(45deg, var(--primary-color-start), var(--primary-color-end));
  color: white;
  border: none;
  cursor: pointer;
  font-weight: 700;
  font-size: var(--btn-font-size);
  clip-path: polygon(
    15% 0%, 85% 0%, 
    100% 35%, 100% 65%, 
    85% 100%, 15% 100%, 
    0% 65%, 0% 35%
  );
  transition: var(--btn-transition);
  box-shadow: 0 4px 10px rgba(0, 123, 255, 0.6);
  user-select: none;
  min-width: 110px;
  text-align: center;
}

.tab:hover {
  background: linear-gradient(45deg, var(--hover-color-start), var(--hover-color-end));
  box-shadow: 0 6px 14px rgba(0, 86, 179, 0.8);
  transform: translateY(-2px);
}

.tab.active {
  background: linear-gradient(45deg, var(--hover-color-start), var(--hover-color-end));
  box-shadow: 0 6px 16px rgba(0, 86, 179, 0.9);
}

.content {
  display: none;
}

.content.active {
  display: block;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

button.main-btn {
  background: linear-gradient(135deg, var(--primary-color-start), var(--primary-color-end));
  color: white;
  padding: 18px 26px;
  border: none;
  cursor: pointer;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--btn-gap);
  width: 100%;
  box-sizing: border-box;
  clip-path: polygon(
    15% 0%, 85% 0%,
    100% 30%, 100% 70%,
    85% 100%, 15% 100%,
    0% 70%, 0% 30%
  );
  transition: var(--btn-transition);
  border-radius: 18px;
  box-shadow: 0 6px 16px rgba(0, 123, 255, 0.5), inset 0 0 0 2px rgba(255,255,255,0.1);
  user-select: none;
  text-shadow: 1px 1px 1px rgba(0,0,0,0.2);
}

button.main-btn:hover {
  background: linear-gradient(135deg, var(--hover-color-start), var(--hover-color-end));
  box-shadow: 0 10px 22px rgba(0, 86, 179, 0.65), inset 0 0 0 2px rgba(255,255,255,0.15);
  transform: translateY(-3px) scale(1.03);
}


.copy-btn {
  background: linear-gradient(45deg, var(--copy-btn-bg-start), var(--copy-btn-bg-end));
  padding: 8px 16px;
  font-size: 14px;
  border-radius: var(--btn-border-radius);
  border: none;
  color: white;
  cursor: pointer;
  clip-path: polygon(
    15% 0%, 85% 0%, 
    100% 35%, 100% 65%, 
    85% 100%, 15% 100%, 
    0% 65%, 0% 35%
  );
  transition: var(--btn-transition);
  user-select: none;
  flex-shrink: 0;
  box-shadow: 0 3px 8px rgba(108, 117, 125, 0.5);
}

.copy-btn:hover {
  background: linear-gradient(45deg, var(--copy-btn-hover-start), var(--copy-btn-hover-end));
  box-shadow: 0 5px 12px rgba(52, 58, 64, 0.75);
  transform: translateY(-1.5px);
}

.star-btn,
.delete-btn {
  background: transparent;
  border: none;
  font-size: 20px;
  cursor: pointer;
  user-select: none;
  flex-shrink: 0;
  padding: 0 10px;
  transition: color 0.3s ease, transform 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.star-btn {
  color: gold;
  filter: drop-shadow(0 0 1px #b8860b);
}

.star-btn:hover {
  color: #ffdb4d;
  filter: drop-shadow(0 0 4px #ffd633);
  transform: scale(1.15);
}

.delete-btn {
  color: #d9534f;
  filter: drop-shadow(0 0 1px #a52a2a);
}

.delete-btn:hover {
  color: #ff6f61;
  filter: drop-shadow(0 0 4px #ff6f61);
  transform: scale(1.15);
}

input[type="text"],
input[type="color"] {
  font-size: 16px;
  padding: 8px 12px;
  border-radius: var(--btn-border-radius);
  border: 1.8px solid var(--input-border);
  outline: none;
  width: 100%;
  box-sizing: border-box;
  transition: border-color 0.25s ease;
}

input[type="text"]:focus,
input[type="color"]:focus {
  border-color: var(--primary-color-end);
  box-shadow: 0 0 8px var(--primary-color-end);
}

.settings-section,
#settings {
  max-width: 480px;
  margin: 0 auto;
  background: rgba(255,255,255,0.18);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  padding: 32px 28px 28px 28px;
  border-radius: 22px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.18), 0 1.5px 8px var(--shadow-color);
  border: 1.5px solid rgba(255,255,255,0.25);
  position: relative;
  animation: fadeInUp 0.7s cubic-bezier(.23,1.02,.32,1) both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px);}
  to   { opacity: 1; transform: translateY(0);}
}

.settings-section h2,
#settings h2 {
  margin-top: 0;
  font-weight: 800;
  color: var(--primary-color-end);
  letter-spacing: 0.5px;
  font-size: 2rem;
  margin-bottom: 18px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.settings-section label,
#settings label {
  display: block;
  margin-bottom: 7px;
  font-weight: 600;
  color: var(--text-color);
  letter-spacing: 0.1px;
  font-size: 1rem;
}

.settings-section .form-group,
#settings .form-group {
  margin-bottom: 22px;
}

.settings-section input[type="text"],
.settings-section input[type="url"],
.settings-section input[type="color"],
#settings input[type="text"],
#settings input[type="url"],
#settings input[type="color"] {
  font-size: 1rem;
  padding: 10px 14px;
  border-radius: 14px;
  border: 1.5px solid var(--input-border);
  outline: none;
  width: 100%;
  margin-bottom: 14px;
  background: rgba(255,255,255,0.7);
  box-shadow: 0 1.5px 6px rgba(0,0,0,0.04);
  transition: border-color 0.22s, box-shadow 0.22s;
}

.settings-section input:focus,
#settings input:focus {
  border-color: var(--primary-color-end);
  box-shadow: 0 0 10px var(--primary-color-end), 0 1.5px 6px rgba(0,0,0,0.08);
}

button,
.settings-section button,
#settings button {
  background: linear-gradient(90deg, var(--primary-color-start), var(--primary-color-end));
  color: #fff;
  border: none;
  padding: 13px 28px;
  font-size: 1.08rem;
  font-weight: 700;
  border-radius: 16px;
  box-shadow: 0 4px 18px rgba(0,123,255,0.13), 0 1.5px 8px rgba(0,0,0,0.06);
  cursor: pointer;
  margin-top: 8px;
  margin-bottom: 8px;
  transition: 
    background 0.22s cubic-bezier(.4,0,.2,1),
    transform 0.13s cubic-bezier(.4,0,.2,1),
    box-shadow 0.22s cubic-bezier(.4,0,.2,1),
    filter 0.18s;
  outline: none;
  position: relative;
  overflow: hidden;
}

button:before {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 0; height: 0;
  background: rgba(255,255,255,0.18);
  border-radius: 100%;
  transform: translate(-50%, -50%);
  transition: width 0.3s, height 0.3s;
  z-index: 0;
}

button:active:before {
  width: 180%;
  height: 400%;
}

button:hover,
.settings-section button:hover,
#settings button:hover {
  background: linear-gradient(90deg, var(--hover-color-start), var(--hover-color-end));
  transform: translateY(-2px) scale(1.035);
  box-shadow: 0 8px 24px rgba(0,86,179,0.18), 0 2px 12px rgba(0,0,0,0.10);
  filter: brightness(1.07);
}

button:active,
.settings-section button:active,
#settings button:active {
  transform: scale(0.98);
  filter: brightness(0.97);
}

.bookmark-container {
  background: rgba(255,255,255,0.13);
  border-radius: 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
  padding: 18px 18px 12px 18px;
  margin-top: 22px;
  margin-bottom: 0;
  animation: fadeInUp 0.7s 0.1s both;
}

.bookmark-link {
  display: inline-block;
  margin-top: 8px;
  padding: 8px 18px;
  background: linear-gradient(90deg, var(--primary-color-start), var(--primary-color-end));
  color: #fff;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  transition: background 0.18s, transform 0.13s;
}

.bookmark-link:hover {
  background: linear-gradient(90deg, var(--hover-color-start), var(--hover-color-end));
  transform: scale(1.06);
}

@media (max-width: 700px) {
  #favoritesContainer {
    padding: 10px 14px;
    gap: 10px;
  }

  #favoritesContainer button {
    padding: 10px 20px;
    font-size: 14px;
    min-width: 100px;
  }

  .tab-container {
    gap: 12px;
  }

  .tab {
    padding: 10px 18px;
    font-size: 14px;
    min-width: 90px;
  }

  button.main-btn {
    font-size: 16px;
    padding: 12px 16px;
  }

  .copy-btn {
    font-size: 13px;
    padding: 6px 14px;
  }

  .settings-section,
  #settings {
    padding: 18px 6vw 18px 6vw;
    max-width: 98vw;
  }
  .container {
    padding: 10px 2vw;
    gap: 18px;
  }
  .tab-container {
    gap: 8px;
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}