header {
    background: linear-gradient(135deg, var(--primary-color), #2980b9);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: clamp(0.75rem, 2vw, 1rem) 0;
    min-height: 3.5rem;
}

.logo {
    font-size: clamp(1.6rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--text-white);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.join-btn {
    background: linear-gradient(135deg, var(--success-color), #219653);
    color: var(--text-white);
    border: none;
    padding: clamp(0.5rem, 1.5vw, 0.75rem) clamp(0.5rem, 3vw, 0.75rem);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    white-space: nowrap;
    font-size: clamp(1.6rem, 2vw, 2em);
    box-shadow: 0 0.125rem 0.5rem rgba(39, 174, 96, 0.3);
    position: relative;
    overflow: hidden;
}

.join-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.join-btn:hover {
    transform: translateY(-0.125rem);
    box-shadow: 0 0.25rem 0.75rem rgba(39, 174, 96, 0.4);
    background: linear-gradient(135deg, #219653, var(--success-color));
}

.join-btn:hover::before {
    left: 100%;
}

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

.container {
    width: 100%;
    max-width: 75rem;
    margin: 0 auto;
    padding: 0 0.9375rem;
}

.chc_nav{
    width: calc(33% - 1%) !important;
    display: inline-block !important;
    margin-top: 0 !important;
}
.chc_nav:last-child {
    margin-right: 0;
}

/* 清除浮动，防止影响后面元素 */
.nav-form select{
    width: 100%;
    height: auto;
    margin-top : 0.8rem;
    padding: clamp(0.4rem, 2.5vw, 0.7rem) clamp(0.5rem, 3vw, 1rem);
    border-radius: clamp(0.5rem, 3vw, 1rem);
    border: 1px solid var(--secondary-color);
    font-size: clamp(1.2rem, 4vw, 1.5rem);
    resize: vertical;
}
/* 卡片网格 */
.cards-grid {
    display: grid;
    gap: clamp(0.75rem, 3vw, 1.2rem);
    margin-top: clamp(0.5rem, 4vw, 1rem);
    margin-bottom: clamp(1rem, 4vw, 1.5rem);
}
.help-card {
    background: var(--card-color);
    border-radius: var(--card-color);
    padding: clamp(0.75rem, 3vw, 1.2rem);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}
.help-card:hover {
    transform: translateY(clamp(-0.125rem, -0.8vw, -0.1875rem));
    border-color: var(--primary-color);
    box-shadow: 0 clamp(0.25rem, 2vw, 0.5rem) clamp(0.75rem, 4vw, 1.25rem) rgba(194, 59, 34, 0.15);
}
.card-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: clamp(0.25rem, 2vw, 0.5rem); }
.card-title { font-weight: 600; font-size: clamp(1.2rem, 3vw, 1.5rem); color: var(--secondary-color); }
.badge {
    width : 4rem;
    background: var(--border-light);
    border-radius: clamp(0.75rem, 4vw, 2rem);
    font-size: clamp(1rem, 2vw, 1.2rem);
    font-weight: 600;
    color: var(--chinared-color);
}
.card-desc {
    color: var(--text-light);
    font-size: clamp(1.2rem, 2.5vw, 1.5rem);
    margin: clamp(0.3rem, 2vw, 0.6rem) 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 弹窗 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(130, 40, 20, 0.85);
    backdrop-filter: blur(clamp(2px, 1vw, 4px));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s;
}
.modal.active { opacity: 1; visibility: visible; }
.modal-content {
    background: #fffef7;
    width: 90%;
    max-width: 550px;
    max-height: 85vh;
    border-radius: clamp(0.75rem, 5vw, 1.5rem);
    border-top: clamp(0.125rem, 0.8vw, 0.25rem) solid var(--primary-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.modal-header {
    padding: clamp(0.5rem, 3vw, 1rem) clamp(0.75rem, 4vw, 1.2rem);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #fffcf9;
    border-bottom: 1px solid #ffe1d7;
}
.modal-header h3 { font-size: clamp(1.2rem, 4vw, 1.5rem); font-weight: 700; color: var(--chinared-color); }
.modal-body {
    padding: clamp(0.5rem, 3vw, 1rem) clamp(0.75rem, 4vw, 1.2rem);
    overflow-y: auto;
    flex: 1;
}
.detail-info {
    background: #fef6f2;
    border-radius: clamp(0.5rem, 3vw, 1rem);
    padding: clamp(0.5rem, 2.5vw, 0.8rem);
    margin-bottom: clamp(0.5rem, 3vw, 1rem);
}
.info-row { margin-bottom: clamp(0.3rem, 2vw, 0.6rem); font-size: clamp(1.2rem, 4vw, 1.5rem); border-bottom: 1px solid var(--border-color);}
.info-row img{ width : 100%; } 
.info-label { font-weight: 700; color: var(--chinared-color); display: inline-block; width: 30%;vertical-align: top; }
.info-content{ color: var(--secondary-color); display: inline-block; width: 68%; }
.replies-section { border-top: 1px solid #ffe0d6; padding-top: clamp(0.5rem, 3vw, 1rem); }
.replies-title { font-weight: 700; font-size: clamp(1.2rem, 4vw, 1.5rem); color: var(--chinared-dark); margin-bottom: clamp(0.25rem, 2vw, 0.5rem); }
.reply-list {
    overflow-y: auto;
    background: #fffbf8;
    border-radius: clamp(0.5rem, 2.5vw, 0.75rem);
    margin-bottom: clamp(0.4rem, 2.5vw, 0.8rem);
}
.reply-item {
    background: white;
    border-radius: clamp(0.5rem, 2.5vw, 0.75rem);
    padding: clamp(0.3rem, 1.8vw, 0.5rem) clamp(0.4rem, 2.5vw, 0.7rem);
    margin-bottom: clamp(0.2rem, 1.5vw, 0.4rem);
    border: 1px solid var(--border-color);
}
.reply-name { font-weight: 700; font-size: clamp(1.2rem, 4vw, 1.5rem); color: var(--chinared-color); display: flex; justify-content: space-between; }
.reply-time { font-size: clamp(1.2rem, 4vw, 1.5rem); color: #b37c66; }
.reply-content { font-size: clamp(1.2rem, 4vw, 1.5rem); color: #3e2a22; margin-top: clamp(0.1rem, 1vw, 0.2rem); }
.reply-content img{width : 100%;}
.reply-input-area { gap: clamp(0.3rem, 2vw, 0.5rem); flex-wrap: wrap; margin-top: clamp(0.3rem, 2vw, 0.5rem); }
.reply-input-area input {
    width : 100%;
    padding: clamp(0.3rem, 2vw, 0.5rem) clamp(0.5rem, 2.5vw, 0.8rem);
    border-radius: clamp(1rem, 5vw, 2rem);
    border: 1px solid var(--secondary-color);
    font-size: clamp(1.2rem, 4vw, 1.5rem);
}
.reply-input-area textarea {
    width : 100%;
    height: auto;
    padding: clamp(0.3rem, 2vw, 0.5rem) clamp(0.5rem, 2.5vw, 0.8rem);
    border-radius: clamp(1rem, 5vw, 2rem);
    border: 1px solid var(--secondary-color);
    font-size: clamp(1.2rem, 4vw, 1.5rem);
    min-height: clamp(6rem, 12vw, 8rem);
    max-height: clamp(12rem, 24vw, 16rem);
    resize: vertical;
    overflow-y: auto;
}
.reply-send-btn {
    width : 50%;
    margin-top : 0.8rem;
    background: var(--chinared-color);
    border: none;
    color: white;
    padding: clamp(0.3rem, 2vw, 0.5rem) clamp(0.6rem, 3vw, 1rem);
    border-radius: clamp(1rem, 5vw, 2rem);
    cursor: pointer;
    font-size: clamp(1.2rem, 4vw, 1.5rem);
}
.empty-replies { text-align: center; font-size: clamp(1.2rem, 4vw, 1.5rem); color: #b77c63; padding: clamp(0.3rem, 2vw, 0.5rem); }
.modal-footer {
    background: #fff6f2;
    padding: clamp(0.3rem, 2vw, 0.6rem);
    text-align: center;
    font-size: clamp(1.2rem, 4vw, 1.5rem);
    color: #b65238;
    border-top: 1px solid #ffded4;
}
.send_pic{
    width: 7rem;
    background: var(--chinared-color);
    border: none;
    color: white;
    font-weight: 600;
    padding: clamp(0.4rem, 2.5vw, 0.7rem);
    border-radius: clamp(1rem, 5vw, 2rem);
    cursor: pointer;
    text-align : center;
    font-size: clamp(0.8rem, 4vw, 1rem);
}
/* 发布表单 */
.publish-form { display: flex; flex-direction: column; gap: clamp(0.5rem, 2.5vw, 0.8rem); }
.publish-form input, .publish-form textarea, .publish-form select , .editor-area{
    width: 100%;
    height: auto;
    margin-top : 0.8rem;
    padding: clamp(0.4rem, 2.5vw, 0.7rem) clamp(0.5rem, 3vw, 1rem);
    border-radius: clamp(0.5rem, 3vw, 1rem);
    border: 1px solid var(--secondary-color);
    font-size: clamp(1.2rem, 4vw, 1.5rem);
    resize: vertical;
}
.editor-area[contenteditable="true"]:empty:before {
    content: attr(placeholder);
    color: #999;
    pointer-events: none;
}
.editor-area img{
    width: 100%;
    height: auto;
}
.btn-primary {
    width :49%;
    background: var(--chinared-color);
    border: none;
    color: white;
    font-weight: 600;
    padding: clamp(0.4rem, 2.5vw, 0.7rem);
    border-radius: clamp(1rem, 5vw, 2rem);
    cursor: pointer;
    font-size: clamp(1.2rem, 4vw, 1.5rem);
}
.empty-state {
    text-align: center;
    padding: clamp(1rem, 5vw, 2rem);
    background: #fffaf7;
    border-radius: clamp(0.75rem, 5vw, 1.5rem);
    color: #b56f58;
}
@media (max-width: 640px) {
    .reply-input-area { flex-direction: column; }
    .reply-send-btn { width: 49%; }
}