:root {
  --accent: #a2ceff;
}

.upload-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.upload-box {
    border: 2px dashed rgba(255,255,255,0.5);
    border-radius: 40px;
    padding: 40px;
    text-align: center;
    background: rgba(255,255,255,0.4);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.upload-box:hover {
  transform: scale(1.02);
  background-color: rgba(0, 0, 0, 0.03);
}

.upload-box.dragover {
  border-color: var(--accent);
  background-color: rgba(162, 206, 255, 0.2);
  transform: scale(1.02);
}

.upload-box.success {
  border-color: #4CAF50;
  background-color: rgba(76, 175, 80, 0.15);
}

.upload-box.success p {
    color: #4CAF50;
    font-weight: 600;
}

.upload-box.success h3 {
    color: #4CAF50;
}

.upload-box input[type="file"] {
    display: none;
}

.preview-section {
    background: rgba(255,255,255,0.4);
    border-radius: 40px;
    padding: 20px;
    text-align: center;
    min-height: 400px;
    position: relative;
    border: 2px solid rgba(255,255,255,0.25);
    box-shadow: var(--shadow-lg);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    max-height: 600px;
    overflow-y: auto;
    padding: 10px;
}

.preview-item {
    background: rgba(255,255,255,0.6);
    border-radius: 30px;
    padding: 15px;
    border: 2px solid rgba(255,255,255,0.25);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.preview-item h4 {
    margin: 0 0 10px 0;
    font-size: 14px;
    color: #333;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preview-name-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.preview-name-input {
    flex: 1;
    padding: 6px 12px;
    border-radius: 12px;
    border: 1.5px solid rgba(0,0,0,0.08);
    background: rgba(255,255,255,0.5);
    font-size: 13px;
    font-family: inherit;
    color: #333;
    outline: none;
    box-sizing: border-box;
    transition: border-color 0.2s ease;
    min-width: 0;
}

.preview-name-input:focus {
    border-color: rgba(162, 206, 255, 0.6);
    background: rgba(255,255,255,0.7);
}

.preview-name-input::placeholder {
    color: #aaa;
}

.preview-item .remove-btn {
    flex-shrink: 0;
    position: static;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(0,0,0,0.06);
    color: #999;
    border: 1.5px solid rgba(0,0,0,0.08);
    cursor: pointer;
    font-size: 14px;
    line-height: 28px;
    text-align: center;
    transition: all 0.2s ease;
    padding: 0;
}

.preview-item .remove-btn:hover {
    background: rgba(255, 80, 80, 0.85);
    color: white;
    border-color: rgba(255, 80, 80, 0.6);
    transform: scale(1.1);
}

.preview-item .remove-btn:active {
    transform: scale(0.85);
}

.preview-item canvas {
    max-width: 100%;
    border-radius: 20px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.preview-item .download-btn {
    margin-top: 10px;
    padding: 8px 20px;
    border-radius: 9999px;
    background: var(--accent);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 14px;
    transition: transform 0.15s ease, background-color 0.15s ease;
}

.preview-item .download-btn:hover {
    transform: scale(1.05);
}

.preview-item .download-btn:active {
transform: scale(0.85);
}

.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.control-group {
    background: rgba(255,255,255,0.4);
    padding: 20px;
    border-radius: 30px;
    border: 2px solid rgba(255,255,255,0.25);
    box-shadow: var(--shadow-lg);
}

.control-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 10px;
    color: #333;
}

.control-group input[type="range"] {
    width: 100%;
    margin-bottom: 5px;
}

.control-group input[type="number"] {
    width: 100%;
    padding: 8px;
    border-radius: 100px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255,255,255,0.6);
    box-sizing: border-box;
}

.control-group select {
    width: 100%;
    padding: 8px;
    border-radius: 100px;
    border: 1px solid rgba(0,0,0,0.1);
    background: rgba(255,255,255,0.6);
}

.control-group.disabled {
    opacity: 0.4;
    pointer-events: none;
}

.button-group {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
}

.big-button {
    padding: 15px 40px;
    border-radius: 9999px;
    font-size: 16px;
    background-color: rgba(255,255,255,0.6);
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s ease, background-color 0.15s ease;
    text-decoration: none;
    color: black;
    cursor: pointer;
    border: none;
    font-weight: 600;
}

.big-button:hover {
    transform: scale(1.05);
    background-color: rgba(0, 0, 0, 0.05);
}

.big-button:active {
    transform: scale(0.9);
    background-color: rgba(0, 0, 0, 0.1);
}

.big-button.primary {
    background: var(--accent);
    color: white;
}

.big-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

#placeholder {
    color: #666;
    margin-top: 100px;
}

.position-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    max-width: 180px;
    margin: 0 auto;
}

.position-cell {
    aspect-ratio: 1.4;
    border: 2px solid rgba(0,0,0,0.12);
    border-radius: 10px;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: #888;
    user-select: none;
}

.position-cell:hover {
    background: rgba(162, 206, 255, 0.3);
    border-color: var(--accent);
}

.position-cell.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(162, 206, 255, 0.5);
}

.mode-toggle {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.mode-btn {
    flex: 1;
    padding: 8px 12px;
    border-radius: 100px;
    border: 2px solid rgba(0,0,0,0.1);
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.15s ease;
    text-align: center;
}

.mode-btn:hover {
    background: rgba(162, 206, 255, 0.2);
}

.mode-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.control-row {
    display: flex;
    gap: 10px;
}

.control-row .control-group {
    flex: 1;
}

/* 预览弹窗 */
.preview-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s ease, visibility 0.35s ease;
}

.preview-overlay.active {
    opacity: 1;
    visibility: visible;
}

.preview-overlay-content {
    max-width: 90vw;
    max-height: 85vh;
    overflow: auto;
    padding: 25px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 40px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    transform: scale(0.9) translateY(20px);
    transition: transform 0.35s ease;
    text-align: center;
}

.preview-overlay.active .preview-overlay-content {
    transform: scale(1) translateY(0);
}

.preview-overlay-content img {
    max-width: 100%;
    max-height: 70vh;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.preview-overlay-title {
    margin: 0 0 15px;
    font-size: 15px;
    color: #333;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preview-overlay-close {
    display: inline-block;
    margin-top: 15px;
    padding: 8px 24px;
    border-radius: 9999px;
    background: rgba(255, 255, 255, 0.4);
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    cursor: pointer;
    font-size: 14px;
    font-family: inherit;
    color: #333;
    transition: all 0.15s ease;
}

.preview-overlay-close:hover {
    background: rgba(0, 0, 0, 0.06);
    transform: scale(1.05);
}

.preview-item canvas {
    cursor: pointer;
}

.rename-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.rename-label {
    font-size: 14px;
    color: #555;
    font-weight: 500;
}

.rename-input {
    padding: 10px 20px;
    border-radius: 9999px;
    border: 1.5px solid rgba(255,255,255,0.3);
    background: rgba(255,255,255,0.4);
    font-size: 14px;
    font-family: inherit;
    outline: none;
    width: 240px;
    color: var(--text-primary);
    transition: border-color 0.2s ease;
}

.rename-input:focus {
    border-color: rgba(162, 206, 255, 0.6);
}

.rename-input::placeholder {
    color: #999;
}

/* 响应式 */
@media (max-width: 768px) {
    .tool-container { padding: 30px 20px; margin: 20px auto; }
    .upload-section { grid-template-columns: 1fr; gap: 20px; }
    .upload-box { min-height: 150px; padding: 30px 20px; }
    .preview-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 15px; }
    .controls { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 15px; }
    .control-group { padding: 16px; border-radius: 20px; }
    .button-group { flex-wrap: wrap; gap: 12px; }
    .big-button { padding: 12px 30px; font-size: 15px; }
}

@media (max-width: 540px) {
    .tool-container { padding: 24px 16px; margin: 15px auto; }
    .upload-box { min-height: 120px; padding: 24px 16px; }
    .upload-box h3 { font-size: 18px; }
    .upload-box p { font-size: 13px; }
    .preview-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; }
    .preview-item canvas { border-radius: 12px; }
    .controls { grid-template-columns: 1fr; gap: 12px; }
    .control-group { padding: 14px; border-radius: 16px; }
    .control-group label { font-size: 14px; margin-bottom: 8px; }
    .button-group { flex-direction: column; gap: 10px; }
    .big-button { width: 100%; padding: 14px; font-size: 15px; }
}