:root {
    --cncha-forest-deep: #166534;
    --cncha-forest-main: #15803d;
    --cncha-forest-light: #22c55e;
    --cncha-forest-pale: #dcfce7;
    --cncha-moss: #65a30d;
    --cncha-sage: #84cc16;
    --cncha-sky: #0ea5e9;
    --cncha-sky-light: #e0f2fe;
    --cncha-earth: #92400e;
    --cncha-stone: #78716c;
    --cncha-cloud: #f8fafc;
    --cncha-leaf: #16a34a;
    --cncha-bamboo: #15803d;
    --cncha-pine: #14532d;
    --cncha-mint: #f0fdf4;
    --cncha-grass: #86efac;
    --cncha-text-main: #1e293b;
    --cncha-text-secondary: #475569;
    --cncha-text-light: #64748b;
    --cncha-border: #bbf7d0;
    --cncha-border-strong: #86efac;
    --cncha-shadow: 0 10px 25px -5px rgba(22, 163, 74, 0.15);
    --cncha-shadow-soft: 0 4px 12px rgba(22, 163, 74, 0.08);
    --cncha-radius: 12px;
    --cncha-radius-sm: 8px;
    --cncha-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
* {
    box-sizing: border-box;
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}
html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #f0fdf4 0%, #ecfdf5 50%, #f0f9ff 100%);
    color: var(--cncha-text-main);
    line-height: 1.8;
    min-height: 100vh;
}
.cncha-footer {
    background: linear-gradient(180deg, var(--cncha-forest-deep) 0%, #14532d 100%);
    color: rgba(255, 255, 255, 0.9);
    padding: 50px 0 25px;
    margin-top: 60px;
    position: relative;
    overflow: hidden;
}
.cncha-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--cncha-leaf), var(--cncha-sage), var(--cncha-grass));
}
.cncha-footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 35px;
    margin-bottom: 35px;
}
.cncha-footer-column h3 {
    color: #fff;
    font-size: 17px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--cncha-leaf);
    font-weight: 600;
}
.cncha-footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.cncha-footer-column li {
    margin-bottom: 12px;
}
.cncha-footer-column a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-weight: 400;
    transition: var(--cncha-transition);
    display: inline-block;
}
.cncha-footer-column a:hover {
    color: #fff;
    transform: translateX(5px);
}
.cncha-footer-bottom {
    text-align: center;
    padding-top: 25px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}
.cncha-main-container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}
.cncha-header {
    background: linear-gradient(135deg, var(--cncha-forest-main) 0%, var(--cncha-forest-deep) 50%, var(--cncha-pine) 100%);
    padding: 40px 0 35px;
    color: white;
    border-radius: 0 0 var(--cncha-radius) var(--cncha-radius);
    margin: 0 0 30px;
    box-shadow: var(--cncha-shadow);
    position: relative;
    overflow: hidden;
}
.cncha-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
}
.cncha-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, transparent, var(--cncha-grass), var(--cncha-sage), var(--cncha-grass), transparent);
}
.cncha-header-content {
    text-align: center;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}
.cncha-h1 {
    font-size: 32px;
    margin-bottom: 12px;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
    letter-spacing: 1px;
}
.cncha-header-desc {
    font-size: 16px;
    opacity: 0.95;
    line-height: 1.6;
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto;
}
.cncha-function-area {
    margin-bottom: 40px;
}
.cncha-card {
    background: #fff;
    border-radius: var(--cncha-radius);
    box-shadow: var(--cncha-shadow-soft);
    overflow: hidden;
    margin-bottom: 30px;
    border: 1px solid var(--cncha-border);
    transition: var(--cncha-transition);
}
.cncha-card:hover {
    box-shadow: var(--cncha-shadow);
    border-color: var(--cncha-border-strong);
}
.cncha-card-header {
    background: linear-gradient(135deg, var(--cncha-mint) 0%, #ecfdf5 100%);
    padding: 20px 24px;
    border-bottom: 2px solid var(--cncha-border);
    display: flex;
    align-items: center;
    gap: 10px;
}
.cncha-card-header::before {
    content: '🌿';
    font-size: 20px;
}
.cncha-card-header h2 {
    color: var(--cncha-forest-deep);
    font-size: 19px;
    font-weight: 700;
    margin: 0;
}
.cncha-card-body {
    padding: 28px;
}
.cncha-converter-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.cncha-form-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.cncha-label {
    font-weight: 600;
    font-size: 15px;
    color: var(--cncha-forest-deep);
    display: flex;
    align-items: center;
    gap: 6px;
}
.cncha-label::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--cncha-leaf);
    border-radius: 50%;
}
.cncha-input, .cncha-textarea {
    padding: 14px 18px;
    border: 2px solid var(--cncha-border);
    border-radius: var(--cncha-radius-sm);
    font-size: 16px;
    color: var(--cncha-text-main);
    background-color: #fff;
    transition: var(--cncha-transition);
    width: 100%;
}
.cncha-input:focus, .cncha-textarea:focus {
    border-color: var(--cncha-leaf);
    outline: none;
    box-shadow: 0 0 0 4px rgba(22, 163, 74, 0.1);
    background-color: var(--cncha-mint);
}
.cncha-input::placeholder, .cncha-textarea::placeholder {
    color: var(--cncha-text-light);
    font-size: 14px;
}
.cncha-textarea {
    resize: vertical;
    min-height: 80px;
    font-family: inherit;
}
.cncha-btn-group {
    display: flex;
    gap: 14px;
    margin-top: 10px;
    flex-wrap: wrap;
}
.cncha-btn {
    padding: 14px 24px;
    border: none;
    border-radius: var(--cncha-radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    flex: 1;
    min-width: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--cncha-transition);
    position: relative;
    overflow: hidden;
}
.cncha-btn:active {
    transform: translateY(1px);
}
.cncha-btn-primary {
    background: linear-gradient(135deg, var(--cncha-leaf) 0%, var(--cncha-forest-main) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(22, 163, 74, 0.3);
}
.cncha-btn-primary:hover {
    background: linear-gradient(135deg, var(--cncha-forest-main) 0%, var(--cncha-forest-deep) 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(22, 163, 74, 0.4);
}
.cncha-btn-convert {
    background: linear-gradient(135deg, var(--cncha-sky) 0%, #0284c7 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}
.cncha-btn-convert:hover {
    background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(14, 165, 233, 0.4);
}
.cncha-btn-secondary {
    background: linear-gradient(135deg, var(--cncha-stone) 0%, #57534e 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(120, 113, 108, 0.3);
}
.cncha-btn-secondary:hover {
    background: linear-gradient(135deg, #57534e 0%, #44403c 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(120, 113, 108, 0.4);
}
.cncha-result-container {
    margin-top: 20px;
    padding: 20px;
    border-radius: var(--cncha-radius-sm);
    background: linear-gradient(135deg, var(--cncha-mint) 0%, #ecfdf5 100%);
    border-left: 5px solid var(--cncha-leaf);
    display: none;
    animation: cncha-slideIn 0.4s ease-out;
}
@keyframes cncha-slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.cncha-result-container h3 {
    color: var(--cncha-forest-deep);
    font-size: 16px;
    margin-bottom: 12px;
    font-weight: 600;
}
.cncha-result-content {
    color: var(--cncha-text-main);
    font-weight: 500;
    font-size: 15px;
    line-height: 1.8;
}
.cncha-result-content strong {
    color: #e53e3e;
    font-weight: 700;
    font-size: 1.1em;
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 4px;
}
.cncha-result-content strong:hover {
    background: #fff5f5;
}
.cncha-error-container {
    color: #991b1b;
    padding: 14px 18px;
    border-radius: var(--cncha-radius-sm);
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    border-left: 5px solid #dc2626;
    margin-top: 15px;
    display: none;
    font-weight: 500;
    font-size: 14px;
}
.cncha-reference-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
    margin-bottom: 40px;
}
@media (max-width: 768px) {
    .cncha-reference-section {
        grid-template-columns: 1fr;
    }
    .cncha-btn-group {
        flex-direction: column;
    }
    .cncha-btn {
        width: 100%;
    }
    .cncha-h1 {
        font-size: 26px;
    }
    .cncha-header {
        padding: 30px 0 25px;
    }
}
.cncha-reference-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    font-size: 14px;
}
.cncha-reference-table th, .cncha-reference-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--cncha-border);
    color: var(--cncha-text-main);
}
.cncha-reference-table th {
    background-color: var(--cncha-mint);
    font-weight: 700;
    color: var(--cncha-forest-deep);
    border-bottom: 2px solid var(--cncha-border-strong);
}
.cncha-reference-table td {
    font-weight: 500;
    background-color: #fff;
}
.cncha-reference-table tr:hover td {
    background-color: var(--cncha-mint);
}
.cncha-copy-btn {
    background: var(--cncha-mint);
    border: 1px solid var(--cncha-border-strong);
    color: var(--cncha-forest-main);
    cursor: pointer;
    font-size: 13px;
    padding: 6px 12px;
    border-radius: var(--cncha-radius-sm);
    font-weight: 600;
    transition: var(--cncha-transition);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.cncha-copy-btn:hover {
    background: var(--cncha-leaf);
    color: white;
    border-color: var(--cncha-leaf);
}
.cncha-text-area {
    margin-bottom: 50px;
}
.cncha-section-title {
    font-size: 26px;
    color: var(--cncha-forest-deep);
    margin-bottom: 35px;
    text-align: center;
    font-weight: 700;
    position: relative;
    padding-bottom: 15px;
}
.cncha-section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--cncha-leaf), var(--cncha-sage));
    margin: 15px auto 0;
    border-radius: 2px;
}
.cncha-guide-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}
.cncha-guide-card {
    background: #fff;
    border-radius: var(--cncha-radius);
    padding: 28px;
    box-shadow: var(--cncha-shadow-soft);
    border: 1px solid var(--cncha-border);
    transition: var(--cncha-transition);
    position: relative;
}
.cncha-guide-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--cncha-leaf), var(--cncha-sage));
    border-radius: var(--cncha-radius) var(--cncha-radius) 0 0;
}
.cncha-guide-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--cncha-shadow);
    border-color: var(--cncha-border-strong);
}
.cncha-guide-card h3 {
    color: var(--cncha-forest-deep);
    font-size: 18px;
    margin-bottom: 16px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}
.cncha-guide-card p {
    color: var(--cncha-text-secondary);
    line-height: 1.8;
    margin: 0;
}
.cncha-guide-card ul {
    color: var(--cncha-text-secondary);
    line-height: 1.9;
    padding-left: 20px;
    margin: 0;
}
.cncha-guide-card li {
    margin-bottom: 8px;
}
.cncha-friend-links {
    background: #fff;
    border-radius: var(--cncha-radius);
    padding: 30px;
    box-shadow: var(--cncha-shadow-soft);
    border: 1px solid var(--cncha-border);
    margin-bottom: 50px;
}
.cncha-links-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 20px;
}
.cncha-links-grid a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--cncha-text-secondary);
    text-decoration: none;
    padding: 10px 18px;
    border-radius: var(--cncha-radius-sm);
    background-color: var(--cncha-mint);
    transition: var(--cncha-transition);
    font-size: 14px;
    font-weight: 500;
    border: 1px solid var(--cncha-border);
}
.cncha-links-grid a:hover {
    background-color: var(--cncha-leaf);
    color: white;
    border-color: var(--cncha-leaf);
    transform: translateY(-2px);
}
.cncha-back-to-top {
    position: fixed;
    bottom: 25px;
    right: 25px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--cncha-leaf) 0%, var(--cncha-forest-main) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--cncha-transition);
    z-index: 99;
    box-shadow: 0 4px 15px rgba(22, 163, 74, 0.4);
    border: none;
}
.cncha-back-to-top.show {
    opacity: 1;
    visibility: visible;
}
.cncha-back-to-top:hover {
    background: linear-gradient(135deg, var(--cncha-forest-main) 0%, var(--cncha-forest-deep) 100%);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(22, 163, 74, 0.5);
}
@media (max-width: 640px) {
    .cncha-main-container {
        padding: 0 16px;
    }
    .cncha-card-body {
        padding: 20px;
    }
    .cncha-h1 {
        font-size: 22px;
    }
    .cncha-header-desc {
        font-size: 14px;
    }
    .cncha-section-title {
        font-size: 22px;
    }
    .cncha-guide-grid {
        grid-template-columns: 1fr;
    }
}
@media print {
    .cncha-back-to-top,
    .cncha-btn-group {
        display: none !important;
    }
    .cncha-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    body {
        background: white;
    }
}