:root {
    --bg-color: #ffffff;
    --text-color: #1d1d1f;
    --secondary-text: #86868b;
    --card-hover: #f5f5f7;
    --border-color: #d2d2d7;
    --tag-bg: #e8e8ed;
    --tag-text: #1d1d1f;
    --accent-color: #0071e3;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1c1c1e;
        --text-color: #f5f5f7;
        --secondary-text: #86868b;
        --card-hover: #2c2c2e;
        --border-color: #38383a;
        --tag-bg: #3a3a3c;
        --tag-text: #ffffff;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

img {
    max-width: 100%;
}

.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 20px;
}

.blog-container .container {
    max-width: 1200px;
}

header {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    z-index: 10;
}

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

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: nowrap;
    min-width: 0;
}

.lang-switcher {
    display: flex;
    gap: 8px;
    align-items: center;
}

.lang-btn {
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 13px;
    text-decoration: none;
    color: var(--secondary-text);
    transition: all 0.2s ease;
    background-color: transparent;
    border: 1px solid transparent;
    cursor: pointer;
}

/* Safari may apply default link/visited styles unless explicitly overridden */
.lang-btn:link,
.lang-btn:visited {
    text-decoration: none;
    color: var(--secondary-text);
}

.lang-btn:hover {
    color: var(--text-color);
    background-color: var(--card-hover);
}

.lang-btn.active {
    color: var(--text-color);
    border-color: var(--border-color);
    font-weight: 600;
}

header h1 {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin: 0;
}

.site-title {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s ease;
    white-space: nowrap;
}

.site-title:hover {
    opacity: 0.7;
}

.nav-menu {
    display: flex;
    gap: 20px;
    flex-wrap: nowrap;
    white-space: nowrap;
}

/* Safari 的字体度量更容易触发换行：保证桌面端标题+导航不换行 */
@media (min-width: 769px) {
    .header-left {
        white-space: nowrap;
    }
    .header-left > * {
        flex: 0 0 auto;
    }
}

.nav-link {
    text-decoration: none;
    color: var(--secondary-text);
    font-size: 16px;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-color);
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .header-left {
        flex-direction: row;
        gap: 15px;
        justify-content: center;
        flex-wrap: wrap;
        min-width: 0;
    }

    .nav-menu {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
        min-width: 0;
    }
    
    .lang-switcher {
        order: -1;
    }
}

main {
    padding: 60px 0;
    flex: 1;
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    max-width: 800px;
}

@media (max-width: 768px) {
    .apps-grid {
        grid-template-columns: 1fr;
    }
}

.app-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: inherit;
    padding: 30px;
    border-radius: 20px;
    transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    text-align: center;
    height: 100%;
}

.app-card:hover {
    background-color: var(--card-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.app-icon {
    width: 128px;
    height: 128px;
    margin-bottom: 20px;
    border-radius: 28px; /* iOS icon shape approximation */
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    flex-shrink: 0;
}

.app-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.app-details {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    width: 100%;
}

.app-details h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

.app-details p {
    font-size: 16px;
    color: var(--secondary-text);
    margin-bottom: 0;
    line-height: 1.4;
}

.tags {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: auto;
    padding-top: 16px;
}

.tag {
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 12px;
    background-color: var(--tag-bg);
    color: var(--tag-text);
    letter-spacing: 0.5px;
}

.tag.free {
    background-color: #e5f9e7;
    color: #00a035;
}

.tag.paid {
    background-color: #fff0e6;
    color: #ff6b00;
}

@media (prefers-color-scheme: dark) {
    .tag.free {
        background-color: rgba(0, 160, 53, 0.2);
        color: #4cd964;
    }
    .tag.paid {
        background-color: rgba(255, 107, 0, 0.2);
        color: #ff9f0a;
    }
}

footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    text-align: center;
    color: var(--secondary-text);
    font-size: 14px;
    margin-top: auto;
}

.social-links {
    margin-top: 10px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.social-links a {
    color: var(--accent-color);
    text-decoration: none;
}

.social-links a:hover {
    text-decoration: underline;
}

/* Support Page Styles */
.support-page {
    max-width: 700px;
    margin: 0 auto;
    padding: 40px 20px;
}

.support-header {
    text-align: center;
    margin-bottom: 40px;
}

.support-icon {
    width: 96px;
    height: 96px;
    border-radius: 22px;
    margin-bottom: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.support-page h1 {
    font-size: 32px;
    font-weight: 600;
    margin: 0 0 40px 0;
}

.support-page h2 {
    font-size: 28px;
    font-weight: 600;
    margin: 0 0 30px 0;
}

.support-notice {
    background-color: rgba(0, 112, 227, 0.1);
    border-left: 4px solid #0070e3;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 40px;
}

.support-notice p {
    margin: 0 0 10px 0;
    font-weight: 500;
}

.support-notice ul {
    margin: 10px 0 0 20px;
    color: var(--text-color);
}

.support-notice li {
    margin: 5px 0;
}

.feedback-form {
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    font-size: 16px;
}

.form-group input[type="email"],
.form-group input[type="file"],
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: border-color 0.2s ease;
}

.form-group input[type="email"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0070e3;
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: var(--secondary-text);
    font-size: 14px;
}

.submit-button {
    background-color: #0070e3;
    color: #ffffff;
    border: none;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.submit-button:hover {
    background-color: #0051a8;
    transform: translateY(-1px);
}

.submit-button:active {
    transform: translateY(0);
}

.support-footer-note {
    color: var(--secondary-text);
    font-size: 14px;
    text-align: center;
    margin-top: 30px;
}

/* Blog Page Styles */
.blog-container {
    max-width: 1200px;
}

.blog-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

@media (max-width: 900px) {
    .blog-cards {
        grid-template-columns: 1fr;
    }
}

.blog-card {
    background-color: var(--card-hover);
    border-radius: 16px;
    padding: 30px;
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: inherit;
    display: block;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.blog-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.blog-card-header {
    margin-bottom: 15px;
}

.blog-card-header h3 {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 8px 0;
}

.blog-card-date {
    color: var(--secondary-text);
    font-size: 14px;
}

.blog-card-summary {
    color: var(--text-color);
    line-height: 1.6;
    margin: 0 0 15px 0;
    font-size: 15px;
}

.blog-card-tag {
    display: inline-block;
    background-color: var(--tag-bg);
    color: var(--tag-text);
    padding: 6px 12px;
    border-radius: 12px;
    font-size: 13px;
}

/* Blog Detail Page Styles */
.blog-detail {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

.blog-detail-header {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.blog-detail-header h1 {
    font-size: 36px;
    font-weight: 700;
    margin: 0 0 15px 0;
}

.blog-detail-meta {
    display: flex;
    gap: 20px;
    align-items: center;
    color: var(--secondary-text);
    font-size: 14px;
}

.blog-detail-content {
    line-height: 1.8;
    color: var(--text-color);
}

.blog-detail-content h2 {
    font-size: 28px;
    font-weight: 600;
    margin: 40px 0 20px 0;
}

.blog-detail-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin: 30px 0 15px 0;
}

.blog-detail-content ul,
.blog-detail-content ol {
    margin: 20px 0;
    padding-left: 30px;
}

.blog-detail-content li {
    margin: 10px 0;
}

.blog-detail-content p {
    margin: 15px 0;
}

.blog-detail-content code {
    background-color: var(--card-hover);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.blog-detail-content pre {
    background-color: var(--card-hover);
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
}

.blog-detail-content pre code {
    background: none;
    padding: 0;
}

/* Detail Page Styles */
.app-hero {
    text-align: center;
    padding: 60px 0;
    max-width: 800px;
    margin: 0 auto;
}

.app-hero .app-icon {
    margin: 0 auto 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.app-hero h1 {
    font-size: 48px;
    margin-bottom: 15px;
}

.app-hero .subtitle {
    font-size: 24px;
    color: var(--secondary-text);
    margin-bottom: 30px;
    font-weight: 400;
}

.download-button {
    display: inline-block;
    background-color: #000;
    color: #fff;
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 18px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.download-button:hover {
    transform: scale(1.05);
    opacity: 0.9;
}

.support-link {
    display: inline-block;
    background-color: transparent;
    color: var(--text-color);
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 40px;
    border: 2px solid var(--border-color);
    font-weight: 600;
    font-size: 18px;
    transition: transform 0.2s ease, background-color 0.2s ease;
}

.support-link:hover {
    transform: scale(1.05);
    background-color: var(--card-hover);
}

@media (prefers-color-scheme: dark) {
    .download-button {
        background-color: #fff;
        color: #000;
    }
}

.app-description {
    max-width: 700px;
    margin: 0 auto 60px;
    padding: 0;
    font-size: 18px;
    line-height: 1.6;
    color: var(--text-color);
    text-align: center;
    width: 100%;
}

.app-description p {
    overflow-wrap: anywhere;
    word-break: break-word;
}

@media (max-width: 768px) {
    .app-description {
        font-size: 16px;
        max-width: 100%;
        padding: 0;
        text-align: center;
    }
    
    .app-hero {
        padding: 60px 0;
    }
    
    .download-button {
        padding: 10px 20px;
        font-size: 16px;
        width: 100%;
        max-width: 280px;
        text-align: center;
    }
    
    .support-link {
        font-size: 11px;
        padding: 2px 8px;
    }
    
    .app-hero h1 {
        font-size: 36px;
    }
    
    .app-hero .subtitle {
        font-size: 18px;
    }
}

.screenshots-section {
    margin-bottom: 60px;
}

.screenshots-container {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    padding: 20px 0;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    width: 100%;
}

.screenshot-placeholder {
    flex: 0 0 280px; /* iPhone width approx */
    height: 600px;
    background-color: var(--card-hover);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary-text);
    scroll-snap-align: center;
    font-size: 14px;
}