body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #0f172a;
    color: #f8fafc;
    transition: background-color 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}
header {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    margin-bottom: 30px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}
h1 {
    margin: -10px 0px 15px 0px;
    font-size: clamp(16px, 8.00px + 1.56vw, 26px);
    font-weight: 800;
    letter-spacing: 2px;
    text-transform: uppercase;
    background: linear-gradient(45deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}
h1 span {
    font-size: 16px;
    font-weight: 400;
    color: #94a3b8;
    margin-left: 10px;
    letter-spacing: 1px;
}
.comment-box {
    font-size: 13px;
    line-height: 1.8;
    color: #cbd5e1;
    background: rgba(15, 23, 42, 0.6);
    padding: 15px;
    border-radius: 6px;
    border-left: 4px solid #38bdf8;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}
.nav-buttons {
    display: flex;
    gap: 12px;
    margin-bottom: 25px;
}
.btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: #f8fafc;
}
.btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}
.btn-primary {
    background: #38bdf8;
    color: #0f172a;
    border: none;
}
.btn-primary:hover {
    background: #7dd3fc;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}
.color-picker-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
    background: rgba(15, 23, 42, 0.5);
    padding: 18px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    margin-bottom: 5px;
}
.input-block {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.input-block label {
    font-size: 11px;
    font-weight: bold;
    color: #94a3b8;
    letter-spacing: 0.5px;
}
.input-block input {
    background: #0f172a;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    color: #f8fafc;
    padding: 10px 15px;
    font-size: 16px;
    font-family: 'Courier New', Courier, monospace;
    width: 150px;
    outline: none;
    transition: border-color 0.2s;
}
.input-block input:focus {
    border-color: #38bdf8;
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}
.preview-block {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.preview-block .preview-title {
    font-size: 11px;
    font-weight: bold;
    color: #94a3b8;
}
#hex-color-preview {
    width: 200px;
    height: 37px;
    background-color: #38bdf8;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: background-color 0.2s ease;
}
.color-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 12px;
    margin-bottom: 50px;
}
.color-card {
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    overflow: hidden;
    text-align: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}
.color-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.2);
}
.color-sample {
    height: 65px;
    width: 100%;
}
.color-label {
    padding: 8px 2px;
    background: #1e293b;
    color: #94a3b8;
    font-size: 11px;
    font-family: 'Courier New', Courier, monospace;
    font-weight: 600;
}
.sample-section {
    background: #1e293b;
    border-radius: 12px;
    padding: 25px;
    margin-top: 40px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}
.sample-section h2 {
    margin: 0 0 20px 0;
    font-size: 20px;
    letter-spacing: 1px;
    background: linear-gradient(45deg, #a855f7, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}
.sample-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 15px;
}
.sample-item {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 15px;
}
.sample-title {
    font-size: 13px;
    font-weight: bold;
    color: #38bdf8;
    margin-bottom: 8px;
}
.sample-preview {
    height: 35px;
    border-radius: 4px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
}
.sample-code {
    background: #0f172a;
    color: #94a3b8;
    padding: 6px 10px;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 11px;
    overflow-x: auto;
    white-space: nowrap;
}
html {
  scroll-behavior: smooth;
}
.pagetop {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  background-color: #333;
  color: #fff;
  text-decoration: none;
  border-radius: 50%;
  font-size: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
  z-index: 99;
}
.pagetop.is-show {
  opacity: 1;
  visibility: visible;
}
.lemon { margin-top: 15px; }
@media screen and (min-width: 1024px) {
    body { padding: 30px; }
    header { padding: 40px; margin-bottom: 40px; }
    h1 { font-size: 32px; }
    .color-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 15px; }
    .sample-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
}
@media (min-width: 835px) and (max-width: 1023px) {
    body { padding: 20px; }
    header { padding: 30px; margin-bottom: 30px; }
    h1 { font-size: 28px; }
    .color-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 12px; }
    .sample-grid { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 15px; }
}
@media (min-width: 744px) and (max-width: 834px) {
    body { padding: 20px; }
    header { padding: 25px; margin-bottom: 25px; }
    h1 { font-size: 26px; }
    .color-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 10px; }
    .sample-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
}
@media (min-width: 541px) and (max-width: 743px) {
    body { padding: 15px; }
    header { padding: 20px; margin-bottom: 20px; }
    h1 { font-size: 24px; }
    h1 span { font-size: 14px; margin-left: 8px; }
    .color-grid { grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); gap: 10px; }
    .color-sample { height: 55px; }
    .sample-grid { grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
}
@media (min-width: 441px) and (max-width: 540px) {
    body { padding: 12px; }
    header { padding: 18px; margin-bottom: 18px; }
    h1 { font-size: 22px; }
    h1 span { display: block; margin-left: 0; margin-top: 5px; font-size: 13px; }
    .color-grid { grid-template-columns: repeat(auto-fill, minmax(85px, 1fr)); gap: 8px; }
    .color-sample { height: 50px; }
    .color-label { font-size: 10px; padding: 6px 2px; }
    .sample-grid { grid-template-columns: 1fr; gap: 10px; }
    .color-picker-container { gap: 12px; padding: 12px; }
    .input-block, .preview-block { width: 100%; }
    .input-block input { width: 100%; box-sizing: border-box; }
    #hex-color-preview { width: 100%; }
}
@media (min-width: 391px) and (max-width: 440px) {
    body { padding: 10px; }
    header { padding: 15px; margin-bottom: 15px; }
    h1 { font-size: 20px; }
    h1 span { display: block; margin-left: 0; margin-top: 4px; font-size: 12px; }
    .color-grid { grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); gap: 8px; }
    .color-sample { height: 48px; }
    .color-label { font-size: 10px; }
    .sample-section { padding: 15px; }
    .sample-grid { grid-template-columns: 1fr; }
    .color-picker-container { gap: 12px; padding: 12px; }
    .input-block, .preview-block { width: 100%; }
    .input-block input { width: 100%; box-sizing: border-box; }
    #hex-color-preview { width: 100%; }
}
@media (min-width: 381px) and (max-width: 390px) {
    body { padding: 10px; }
    header { padding: 15px; margin-bottom: 15px; }
    h1 { font-size: 19px; }
    h1 span { display: block; margin-left: 0; margin-top: 4px; font-size: 11px; }
    .color-grid { grid-template-columns: repeat(auto-fill, minmax(78px, 1fr)); gap: 6px; }
    .color-sample { height: 45px; }
    .color-label { font-size: 9.5px; }
    .sample-section { padding: 15px; }
    .sample-grid { grid-template-columns: 1fr; }
    .color-picker-container { gap: 12px; padding: 12px; }
    .input-block, .preview-block { width: 100%; }
    .input-block input { width: 100%; box-sizing: border-box; }
    #hex-color-preview { width: 100%; }
}
@media (min-width: 375px) and (max-width: 380px) {
    body { padding: 8px; }
    header { padding: 12px; margin-bottom: 12px; }
    h1 { font-size: 18px; letter-spacing: 1px; }
    h1 span { display: block; margin-left: 0; margin-top: 4px; font-size: 11px; }
    .comment-box { font-size: 12px; padding: 10px; line-height: 1.6; }
    .color-grid { grid-template-columns: repeat(auto-fill, minmax(75px, 1fr)); gap: 6px; }
    .color-sample { height: 42px; }
    .color-label { font-size: 9px; }
    .sample-section { padding: 12px; }
    .sample-grid { grid-template-columns: 1fr; }
    .color-picker-container { gap: 12px; padding: 12px; }
    .input-block, .preview-block { width: 100%; }
    .input-block input { width: 100%; box-sizing: border-box; }
    #hex-color-preview { width: 100%; }
}
@media (max-width: 374px) {
    body { padding: 6px; }
    header { padding: 10px; margin-bottom: 10px; }
    h1 { font-size: 16px; letter-spacing: 1px; }
    h1 span { display: block; margin-left: 0; margin-top: 4px; font-size: 10px; }
    .comment-box { font-size: 11px; padding: 8px; line-height: 1.5; margin-bottom: 12px; }
    .nav-buttons { gap: 8px; }
    .btn { padding: 8px 14px; font-size: 11px; }
    .color-grid { grid-template-columns: repeat(auto-fill, minmax(68px, 1fr)); gap: 5px; }
    .color-sample { height: 38px; }
    .color-label { font-size: 8.5px; padding: 4px 1px; }
    .sample-section { padding: 10px; margin-top: 25px; }
    .sample-section h2 { font-size: 16px; margin-bottom: 12px; }
    .sample-grid { grid-template-columns: 1fr; gap: 8px; }
    .sample-item { padding: 10px; }
    .color-picker-container { gap: 12px; padding: 10px; }
    .input-block, .preview-block { width: 100%; }
    .input-block input { padding: 8px 12px; font-size: 14px; width: 100%; box-sizing: border-box; }
    #hex-color-preview { width: 100%; height: 35px; }
}