:root {
    /* 清新莫兰迪色系 (Fresh Morandi Palette) */
    --bg-color: #F2F4F3;          /* 浅灰绿背景 */
    --card-bg: #FFFFFF;           /* 卡片白 */
    --text-primary: #5A6A72;      /* 深灰蓝文字 */
    --text-secondary: #8C9CA5;    /* 浅灰蓝文字 */
    --accent-green: #99B0A6;      /* 莫兰迪绿 (Sage) */
    --accent-green-hover: #82998F;
    --accent-blue: #A3B9C9;       /* 莫兰迪蓝 (Dusty Blue) */
    --accent-blue-hover: #8EA5B6;
    --border-color: #E0E5E8;
    --input-bg: #FAFCFB;
    --logo-color: #B88E8E;        /* 复古红褐色 */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative; /* 为 logo 绝对定位提供参照 */
}

/* 复古邮戳 Logo 样式 */
.logo-stamp {
    position: absolute;
    top: 0;
    left: 20px; /* 或者 right: 20px，看用户喜好，这里放左上角或者右上角 */
    width: 100px;
    height: 100px;
    border: 3px double var(--logo-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(-15deg);
    opacity: 0.8;
    z-index: 10;
    pointer-events: none; /* 防止遮挡点击 */
    background-image: radial-gradient(circle, transparent 60%, rgba(184, 142, 142, 0.1) 100%);
    box-shadow: 0 0 0 1px rgba(184, 142, 142, 0.2) inset;
}

.logo-inner {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 80%;
    height: 80%;
    border: 1px dashed var(--logo-color);
    border-radius: 50%;
}

.logo-text {
    font-family: 'Courier New', Courier, monospace;
    font-weight: 900;
    font-size: 1.1rem;
    color: var(--logo-color);
    letter-spacing: 1px;
    line-height: 1;
}

.logo-sub {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.6rem;
    color: var(--logo-color);
    margin-top: 4px;
    letter-spacing: 2px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 20px; /* 为 logo 留点空间，如果重叠的话 */
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 300;
}

.app-layout {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 30px;
    align-items: start;
}

@media (max-width: 900px) {
    .app-layout {
        grid-template-columns: 1fr;
    }
    .logo-stamp {
        width: 80px;
        height: 80px;
        left: 10px;
        top: -10px;
    }
    .logo-text {
        font-size: 0.9rem;
    }
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
}

/* 控制面板样式 */
.controls-panel .card {
    position: sticky;
    top: 20px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
}

input[type="number"],
textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--input-bg);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

input[type="number"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(153, 176, 166, 0.2);
}

textarea {
    height: 150px;
    resize: vertical;
    line-height: 1.5;
}

/* 文件上传按钮美化 */
.file-upload {
    display: flex;
    flex-direction: column;
    align-items: start;
}

input[type="file"] {
    display: none;
}

.custom-file-upload {
    display: inline-block;
    padding: 12px 24px;
    cursor: pointer;
    background-color: var(--input-bg);
    border: 1px dashed var(--accent-blue);
    border-radius: 8px;
    color: var(--accent-blue);
    font-weight: 500;
    transition: all 0.3s ease;
    width: 100%;
    text-align: center;
}

.custom-file-upload:hover {
    background-color: #F0F7FA;
    border-color: var(--accent-blue-hover);
}

.file-name {
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    word-break: break-all;
}

/* 颜色选择器美化 */
.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 40px;
    height: 40px;
    cursor: pointer;
    background: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.color-value {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-family: monospace;
}

/* 栅格布局设置项 */
.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

/* 按钮样式 */
.actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.btn {
    flex: 1;
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--accent-green);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-green-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(153, 176, 166, 0.4);
}

.btn-secondary {
    background-color: var(--accent-blue);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--accent-blue-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(163, 185, 201, 0.4);
}

/* 预览区样式 */
.preview-panel {
    display: flex;
    justify-content: center;
}

.preview-container {
    width: 100%;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #FAFCFB;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
}

.placeholder-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
    text-align: center;
    padding: 20px;
}

#resultCanvas {
    max-width: 100%;
    height: auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    display: none; /* 默认隐藏，生成后显示 */
}

#resultImage {
    max-width: 100%;
    height: auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}