/* 按钮成熟克制，无动感放大的悬浮特效，无渐变炫技 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    line-height: 1;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--color-text-main);
    color: var(--color-surface);
}

/* 悬浮时静静过渡至陶土色 */
.btn-primary:hover {
    background-color: var(--color-accent);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-main);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-border);
}

/* 动作组 */
.action-group {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
}
.action-group.center {
    justify-content: center;
}

/* 卡片像编辑模块，不像电商宫格。极其微弱的阴影，依靠边框和背景剥离层级 */
.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-3);
    box-shadow: 0 4px 24px rgba(0,0,0,0.02);
    transition: var(--transition-slow);
    display: flex;
    flex-direction: column;
}

.card:hover {
    border-color: #d8d5d0;
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-1);
    font-weight: 500;
    color: var(--color-text-main);
}

/* 标签样式 - 显示模块化类型 */
.tag {
    display: inline-block;
    padding: 0.35rem 0.85rem;
    font-size: 0.8rem;
    border-radius: 99px;
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    margin-bottom: var(--spacing-2);
    font-weight: 500;
    align-self: flex-start;
}

/* 下载专区卡片特殊微调 */
.download-card {
    align-items: center;
    text-align: center;
    padding: var(--spacing-4) var(--spacing-2);
    gap: var(--spacing-2);
}

.download-icon {
    width: 48px;
    height: 48px;
    color: var(--color-text-main);
    margin-bottom: var(--spacing-1);
}

/* 输入框像写作空间，不像后台表单 */
.writing-space {
    width: 100%;
    max-width: 600px;
    margin: 0 auto var(--spacing-4) auto;
}

.input-space {
    width: 100%;
    padding: var(--spacing-2) 0;
    font-size: 1.125rem;
    color: var(--color-text-main);
    border-bottom: 1px solid var(--color-border);
    background: transparent;
    transition: var(--transition-fast);
}

.input-space::placeholder {
    color: var(--color-text-light);
    font-weight: 300;
}

.input-space:focus {
    border-bottom-color: var(--color-accent);
}

/* 动效辅助类：安静顺滑，存在感低 */
.fade-up {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.8s var(--easing-smooth), transform 0.8s var(--easing-smooth);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* staggered 延迟工具 */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }

/* 品牌图标：图片形式，圆角 */
.brand-icon-img {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    object-fit: cover;
    flex-shrink: 0;
}

/* ── Naming 区块：词根卡片 ── */
.naming-card {
    padding: var(--spacing-4);
}

.naming-word-row {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    margin-bottom: var(--spacing-1);
}

.naming-word {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--color-accent);
    line-height: 1;
}

.naming-phonetic {
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-style: italic;
}

.naming-subtitle {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2);
}

/* ── Features 区块：图文混排 ── */
.features-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-5);
}

.feature-block {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: var(--spacing-4);
    align-items: center;
    padding: var(--spacing-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    transition: var(--transition-slow);
}

.feature-block:nth-child(even) {
    grid-template-columns: 1.4fr 1fr;
}

.feature-block:nth-child(even) .feature-screenshot {
    order: -1;
}

.feature-block:hover {
    border-color: #d8d5d0;
    box-shadow: 0 8px 40px rgba(0,0,0,0.04);
}

.feature-text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.feature-screenshot {
    overflow: hidden;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.screenshot-img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.6s var(--easing-smooth);
}

.feature-block:hover .screenshot-img {
    transform: scale(1.02);
}

/* 响应式适配 */
@media (max-width: 768px) {
    .feature-block,
    .feature-block:nth-child(even) {
        grid-template-columns: 1fr;
    }

    .feature-block:nth-child(even) .feature-screenshot {
        order: 0;
    }

    .naming-word {
        font-size: 2rem;
    }
}

/* ── 下载区域：平台图标与特定按钮 ── */
.platform-icon-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-2);
    height: 48px;
    width: 48px;
    border-radius: 50%;
    background-color: var(--color-surface-dim);
    color: var(--color-text-main);
}
.platform-icon {
    width: 24px;
    height: 24px;
}

/* 统一风格的定制下载按钮 (陶土色) */
.btn-orange {
    background-color: var(--color-accent); /* 陶土色 #C87A64 */
    color: var(--color-surface);
    border: none;
    text-decoration: none;
}

.btn-orange:hover {
    background-color: var(--color-accent-hover); /* #B06551 */
}

/* =========================================
   Modal (弹窗) 样式
   ========================================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s var(--easing-smooth);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background-color: var(--color-surface);
    width: 90%;
    max-width: 400px;
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.4s var(--easing-smooth), opacity 0.4s var(--easing-smooth);
    opacity: 0;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-3);
    border-bottom: 1px solid var(--color-border);
}

.modal-header .card-title {
    margin-bottom: 0;
    font-size: 1.1rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 0.25rem;
    transition: color 0.2s ease;
    display: flex;
}

.modal-close:hover {
    color: var(--color-text-main);
}

.modal-body {
    padding: var(--spacing-3);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.modal-option {
    width: 100%;
    justify-content: center;
}