/**
 * 思幻去水印 - 自定义样式
 * 现代扁平化纯白风格
 * @version 1.0.0
 */

/* ============================================================
   CSS Variables
   ============================================================ */
:root {
    --color-primary: #1677FF;
    --color-primary-light: #69B1FF;
    --color-primary-bg: rgba(22, 119, 255, 0.06);
    --color-accent: #FF6B35;
    --color-success: #52C41A;
    --color-error: #FF4D4F;
    --color-text-primary: #1F1F1F;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;
    --color-bg: #FFFFFF;
    --color-bg-secondary: #FAFAFA;
    --color-bg-hover: #F0F0F0;
    --color-border: #E8E8E8;
    --color-border-light: #F0F0F0;
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.10);
    --shadow-elevated: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    --container-width: 1200px;
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-smooth: 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================================================
   Global Reset
   ============================================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
}

.header-inner {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--color-text-primary);
    transition: opacity var(--transition-fast);
}

.logo-link:hover {
    opacity: 0.8;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    flex-shrink: 0;
    object-fit: contain;
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.header-nav {
    display: flex;
    gap: 24px;
}

.nav-link {
    font-size: 14px;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    padding: 4px 0;
}

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

/* ============================================================
   Hero Section
   ============================================================ */
.hero-section {
    padding: 60px 0 40px;
    text-align: center;
}

.hero-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.3;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.hero-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
    max-width: 620px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

/* Input Area */
.input-area {
    max-width: 680px;
    margin: 0 auto;
}

.input-group {
    display: flex;
    align-items: center;
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 4px 4px 4px 16px;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-card);
}

.input-group:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(22, 119, 255, 0.12);
}

.input-group.error {
    border-color: var(--color-error);
    box-shadow: 0 0 0 3px rgba(255, 77, 79, 0.08);
    animation: shake 0.4s ease;
}

.input-icon-wrap {
    display: flex;
    align-items: center;
    margin-right: 8px;
    flex-shrink: 0;
}

.input-icon {
    width: 20px;
    height: 20px;
}

.url-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 15px;
    color: var(--color-text-primary);
    background: transparent;
    padding: 12px 0;
    min-width: 0;
    font-family: var(--font-family);
}

.url-input::placeholder {
    color: var(--color-text-tertiary);
}

.parse-btn {
    display: flex !important;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    height: 44px !important;
    padding: 0 24px !important;
    border-radius: var(--radius) !important;
    border: none !important;
    background: var(--color-primary) !important;
    color: #fff !important;
    font-size: 15px !important;
    font-weight: 500 !important;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    font-family: var(--font-family);
}

.parse-btn:hover {
    background: #4096FF !important;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(22, 119, 255, 0.3);
}

.parse-btn:active {
    transform: translateY(0) scale(0.98);
}

.parse-btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.input-tips {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 10px;
    min-height: 20px;
    gap: 12px;
}

.platform-hint {
    font-size: 13px;
    color: var(--color-text-tertiary);
}

.platform-hint.recognized {
    color: var(--color-primary);
    font-weight: 500;
}

.error-hint {
    font-size: 13px;
    color: var(--color-error);
}

/* ============================================================
   Platform Section
   ============================================================ */
.platforms-section {
    padding: 20px 0 40px;
}

.section-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-text-primary);
    text-align: center;
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}

.section-subtitle {
    font-size: 14px;
    color: var(--color-text-tertiary);
    text-align: center;
    margin-bottom: 28px;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
    max-width: 900px;
    margin: 0 auto;
}

.platform-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 24px 12px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    cursor: default;
    transition: all var(--transition-smooth);
    text-align: center;
}

.platform-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-border);
    background: var(--color-bg);
}

.platform-card.active {
    border-color: var(--color-primary);
    background: var(--color-primary-bg);
    box-shadow: 0 0 0 2px rgba(22, 119, 255, 0.1);
}

.platform-card .platform-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-base);
    overflow: hidden;
}

.platform-card .platform-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.platform-card:hover .platform-icon {
    transform: scale(1.05);
}

.platform-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
    line-height: 1.3;
}

.platform-tag {
    font-size: 11px;
    color: var(--color-text-tertiary);
    background: var(--color-bg);
    padding: 2px 8px;
    border-radius: 10px;
    border: 1px solid var(--color-border-light);
}

/* ============================================================
   Result Section
   ============================================================ */
.result-section {
    padding: 0 0 50px;
}

.result-meta {
    text-align: center;
    margin-bottom: 24px;
    padding: 16px 24px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--color-border-light);
    display: none;
}

.result-meta.visible {
    display: block;
}

.result-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 6px;
}

.result-author {
    font-size: 13px;
    color: var(--color-text-tertiary);
}

.result-images {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.result-images:empty {
    display: none;
}

.image-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-smooth);
    cursor: pointer;
    aspect-ratio: 1;
}

.image-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
}

.image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.image-card .image-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.image-card:hover .image-overlay {
    opacity: 1;
}

.image-overlay .overlay-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
    color: var(--color-text-primary);
}

.image-overlay .overlay-btn:hover {
    transform: scale(1.1);
}

.result-video {
    display: none;
    margin-bottom: 24px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #000;
    aspect-ratio: 16 / 9;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

.result-video.visible {
    display: block;
}

.result-video video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.result-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.result-actions .download-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    color: var(--color-text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-family);
    text-decoration: none;
}

.result-actions .download-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-bg);
}

.result-actions .download-btn.primary {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.result-actions .download-btn.primary:hover {
    background: #FF8A66;
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    display: none;
}

.empty-state.visible {
    display: block;
}

.empty-state svg {
    width: 120px;
    height: 120px;
    margin-bottom: 16px;
    opacity: 0.4;
}

.empty-state .empty-text {
    font-size: 15px;
    color: var(--color-text-tertiary);
}

/* Loading */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

/* ============================================================
   Tutorial Section
   ============================================================ */
.tutorial-section {
    padding: 50px 0;
    background: var(--color-bg-secondary);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 32px;
}

.step-card {
    text-align: center;
    padding: 32px 20px;
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
}

.step-card:hover {
    box-shadow: var(--shadow-card);
}

.step-number {
    width: 44px;
    height: 44px;
    line-height: 44px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 8px;
}

.step-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ============================================================
   FAQ Section
   ============================================================ */
.faq-section {
    padding: 50px 0 60px;
}

.faq-list {
    max-width: 720px;
    margin: 32px auto 0;
}

.faq-item {
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius);
    margin-bottom: 8px;
    background: var(--color-bg);
    transition: all var(--transition-base);
}

.faq-item:hover {
    border-color: var(--color-border);
}

.faq-item[open] {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-card);
}

.faq-question {
    padding: 16px 20px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-primary);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: color var(--transition-fast);
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question::after {
    content: '+';
    font-size: 20px;
    color: var(--color-text-tertiary);
    font-weight: 300;
    transition: transform var(--transition-base);
    flex-shrink: 0;
    margin-left: 12px;
}

.faq-item[open] .faq-question {
    color: var(--color-primary);
}

.faq-item[open] .faq-question::after {
    content: '−';
    color: var(--color-primary);
}

.faq-answer {
    padding: 0 20px 16px;
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
    border-top: 1px solid var(--color-border-light);
    background: var(--color-bg-secondary);
    padding: 20px 0;
}

.footer-inner {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.footer-left, .footer-right {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--color-text-tertiary);
}

.footer-brand {
    font-weight: 600;
    color: var(--color-text-secondary);
}

.footer-divider {
    color: var(--color-border);
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.fade-in-up {
    animation: fadeInUp 0.4s var(--transition-smooth) both;
}

/* ============================================================
   Layui Overrides
   ============================================================ */
.layui-layer-dialog .layui-layer-content {
    font-family: var(--font-family);
}

/* ============================================================
   Responsive
   ============================================================ */

/* Tablet: 768px - 991px */
@media (max-width: 991px) {
    .hero-title {
        font-size: 26px;
    }
    
    .platform-grid {
        grid-template-columns: repeat(3, 1fr);
        max-width: 100%;
    }
    
    .platform-grid .platform-card:nth-child(4),
    .platform-grid .platform-card:nth-child(5) {
        grid-column: span 1;
    }
    
    .platform-grid .platform-card:nth-child(4) {
        grid-column: 1;
    }
    
    .result-images {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .steps-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
    }
    
    .step-card {
        padding: 24px 12px;
    }
}

/* Mobile: < 768px */
@media (max-width: 767px) {
    .header-inner {
        height: 52px;
    }
    
    .logo-text {
        font-size: 16px;
    }
    
    .hero-section {
        padding: 40px 0 28px;
    }
    
    .hero-title {
        font-size: 22px;
    }
    
    .hero-desc {
        font-size: 14px;
        margin-bottom: 24px;
    }
    
    .input-group {
        flex-direction: column;
        padding: 8px;
        gap: 8px;
    }
    
    .input-icon-wrap {
        display: none;
    }
    
    .url-input {
        width: 100%;
        padding: 10px 12px;
        border-radius: var(--radius);
        border: 1px solid var(--color-border-light);
        font-size: 14px;
    }
    
    .parse-btn {
        width: 100%;
        justify-content: center;
        height: 46px !important;
    }
    
    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .platform-grid .platform-card:nth-child(4),
    .platform-grid .platform-card:nth-child(5) {
        grid-column: auto;
    }
    
    .platform-card {
        padding: 16px 8px;
    }
    
    .platform-card .platform-icon {
        width: 40px;
        height: 40px;
    }
    
    .result-images {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .faq-list {
        max-width: 100%;
    }
    
    .faq-question {
        padding: 14px 16px;
        font-size: 14px;
    }
    
    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-left, .footer-right {
        font-size: 12px;
    }
    
    .input-group:focus-within {
        border-color: var(--color-border);
        box-shadow: none;
    }
    
    .url-input:focus {
        border-color: var(--color-primary);
        box-shadow: 0 0 0 2px rgba(22, 119, 255, 0.12);
    }
    
    .result-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .result-actions .download-btn {
        width: 100%;
        justify-content: center;
    }
}

/* Large Desktop: > 1200px */
@media (min-width: 1200px) {
    .hero-title {
        font-size: 36px;
    }
}