:root {
    /* 淡雅配色系统 */
    --bg-main: #fcfcfd;
    --bg-gradient: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    --card-bg: rgba(255, 255, 255, 0.65);
    --card-border: rgba(255, 255, 255, 0.8);
    --card-hover: rgba(255, 255, 255, 0.9);
    --primary-color: #8b5cf6; /* 柔和紫 */
    --primary-gradient: linear-gradient(135deg, #7e22ce 0%, #ec4899 100%);
    --text-main: #2d3748;
    --text-muted: #718096;
    --success-color: #10b981;
    --input-bg: rgba(255, 255, 255, 0.5);
    
    /* 效果 */
    --glass-blur: blur(16px);
    --shadow-subtle: 0 8px 32px rgba(31, 38, 135, 0.05);
    --shadow-glow: 0 8px 20px rgba(161, 140, 209, 0.2);
    
    /* 动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-main);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* 装饰背景泡泡 - 淡雅马卡龙色 */
body::before, body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    opacity: 0.5;
}

body::before {
    top: -100px;
    left: -100px;
    width: 500px;
    height: 500px;
    background: #ffecd2;
}

body::after {
    bottom: -100px;
    right: -100px;
    width: 400px;
    height: 400px;
    background: #fcb69f;
}

/* 添加一个中间点缀色 */
.app-container::before {
    content: '';
    position: fixed;
    top: 40%;
    left: 60%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    opacity: 0.4;
    background: #c2e9fb;
    pointer-events: none;
}

.app-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 1rem;
    position: relative;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    transition: var(--transition-fast);
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--card-hover);
    border-color: var(--primary-color);
}

/* Glass Panel Utility */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-subtle);
}

/* Input Section */
.input-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards;
    animation-delay: 0.1s;
}

/* Decoration Section */
.decoration-section {
    opacity: 0;
    animation: fadeUp 0.6s ease forwards;
    animation-delay: 0.2s;
}

#text-input {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 1.2rem;
    font-family: inherit;
    resize: none;
    outline: none;
}

#text-input::placeholder {
    color: rgba(45, 55, 72, 0.4);
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(0,0,0,0.05);
    padding-top: 1rem;
}

.input-options {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
}

.checkbox-label:hover {
    color: var(--primary-color);
}

.checkbox-label input[type="checkbox"] {
    accent-color: var(--primary-color);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.char-count {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 8px;
}

.icon-btn:hover {
    color: var(--primary-color);
    background: rgba(0,0,0,0.03);
}

/* Decoration Section */
.decoration-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.decoration-header h2 {
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-main);
}

.decoration-header h2 svg {
    color: #f6ad55; /* 给星星图标一点暖色 */
}

.toggle-icon {
    transition: transform var(--transition-normal);
    color: var(--text-muted);
}

.decoration-content {
    margin-top: 1.5rem;
    display: none;
    animation: fadeIn var(--transition-normal);
}

.decoration-content.active {
    display: block;
}

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

.control-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-group label {
    font-size: 0.9rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.control-group input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 8px;
    padding: 0.5rem;
    color: var(--text-main);
    outline: none;
    transition: var(--transition-fast);
}

.control-group input:focus {
    border-color: var(--primary-color);
    background: #fff;
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.1);
}

.preset-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding-top: 1rem;
    border-top: 1px dashed rgba(0,0,0,0.05);
}

.preset-controls label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-right: 0.5rem;
}

.preset-btn {
    background: var(--input-bg);
    border: 1px solid rgba(0,0,0,0.05);
    color: var(--text-muted);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.preset-btn:hover {
    background: #fff;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Category Tabs */
.category-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(0,0,0,0.1) transparent;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards;
    animation-delay: 0.3s;
}

.category-tabs::-webkit-scrollbar {
    height: 4px;
}
.category-tabs::-webkit-scrollbar-thumb {
    background-color: rgba(0,0,0,0.1);
    border-radius: 4px;
}

.tab-btn {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-subtle);
}

.tab-btn:hover {
    background: var(--card-hover);
    color: var(--primary-color);
}

.tab-btn.active {
    background: var(--primary-gradient);
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-glow);
}

/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.result-card {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-subtle);
}

.result-card:hover {
    transform: translateY(-2px);
    border-color: rgba(161, 140, 209, 0.4);
    box-shadow: var(--shadow-glow);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.copy-btn {
    background: rgba(139, 92, 246, 0.08);
    border: none;
    color: var(--primary-color);
    padding: 0.3rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 500;
}

.copy-btn:hover {
    background: var(--primary-color);
    color: #fff;
}

.copy-btn.copied {
    background: var(--success-color);
    color: #fff;
}

.result-text {
    font-size: 1.5rem;
    word-break: break-all;
    min-height: 2.5rem;
    line-height: 1.4;
    color: var(--text-main);
}

.result-text.placeholder {
    color: rgba(45, 55, 72, 0.3);
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(0,0,0,0.05);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

.footer a:hover {
    color: var(--primary-color);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--success-color);
    color: #fff;
    padding: 0.8rem 1.5rem;
    border-radius: 30px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
    transition: bottom 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
}

.toast.show {
    bottom: 30px;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
}