/* Project Detail Page Styles */

/* Workflow Placeholders */
.workflow-section {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.workflow-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.workflow-placeholder {
    position: relative;
    background: var(--bg-secondary);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    aspect-ratio: 16 / 9;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-weight: 600;
    font-size: var(--font-size-lg);
}

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

.workflow-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.workflow-caption {
    padding: 8px 10px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    background: white;
    text-align: center;
    border-radius: var(--border-radius);
    margin: 0;
    font-weight: 500;
}

.workflow-placeholder span {
    background: rgba(255, 255, 255, 0.7);
    padding: 6px 12px;
    border-radius: 8px;
}

/* Project Header */
.project-header {
    padding: 100px 0 var(--spacing-2xl);
    background: linear-gradient(135deg, var(--bg-warm) 0%, var(--bg-secondary) 100%);
    margin-top: 70px;
}

.project-header-content {
    grid-column: 1;
}

.project-header .container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.project-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.project-type {
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.project-date {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: var(--font-size-sm);
}

.project-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.project-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

.project-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-lg);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

.stat-item .stat-number {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.stat-item .stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-light);
}

.project-header .project-image {
    grid-column: 2;
}

.project-header .project-image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-large);
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: var(--font-size-3xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

/* Project Overview */
.project-overview {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-primary);
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.overview-card {
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    text-align: center;
    transition: var(--transition);
}

.overview-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.card-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.card-icon i {
    font-size: var(--font-size-2xl);
    color: white;
}

.overview-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.overview-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Key Features Grid */
.key-features {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-warm);
}

.feature-small-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.feature-small-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-small-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.feature-thumb {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--bg-secondary);
    overflow: hidden;
}

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

.feature-desc {
    padding: var(--spacing-md);
    text-align: center;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Lightbox */
.lightbox-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.lightbox-overlay.open {
    display: flex;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-img {
    max-width: none;
    max-height: none;
    object-fit: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-large);
    transition: transform 0.1s ease;
    transform-origin: center center;
    cursor: grab;
    user-select: none;
}

.lightbox-img:active {
    cursor: grabbing;
}

/* Lightbox caption at bottom center */
.lightbox-caption {
    position: absolute;
    left: 50%;
    bottom: 16px;
    transform: translateX(-50%);
    max-width: calc(90vw - 120px);
    padding: 6px 10px;
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    border-radius: 8px;
    font-size: var(--font-size-sm);
    line-height: 1.4;
    text-align: center;
    pointer-events: none;
}

.lightbox-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.85);
    color: var(--text-primary);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-medium);
}

.lightbox-prev { left: -56px; }
.lightbox-next { right: -56px; }

.lightbox-close {
    position: absolute;
    top: -50px;
    right: 0;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-medium);
}

@media (max-width: 768px) {
    .lightbox-prev { left: 8px; }
    .lightbox-next { right: 8px; }
    .lightbox-close { top: 8px; right: 8px; }
}

body.lightbox-open { overflow: hidden; }

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.feature-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-large);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.feature-icon i {
    color: white;
    font-size: var(--font-size-lg);
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-lg);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.feature-card ul {
    list-style: none;
    padding: 0;
}

.feature-card li {
    position: relative;
    padding-left: 20px;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    line-height: 1.5;
}

.feature-card li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* Technical Section */
.technical-section {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.tech-card {
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    border-left: 4px solid var(--primary-color);
}

.tech-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.tech-card ul {
    list-style: none;
    padding: 0;
}

.tech-card li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.tech-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Results Section */
.results-section {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.result-category {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
}

.result-category h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-color);
}

.result-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.result-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
}

.result-number {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.result-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Challenges, Solutions & Lessons Section */
.challenges-lessons-section {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.challenges-lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.challenge-lesson-item {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    position: relative;
}

.challenge-icon {
    position: absolute;
    top: -20px;
    left: var(--spacing-lg);
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.challenge-icon i {
    color: white;
    font-size: var(--font-size-lg);
}

.challenge-lesson-item h3 {
    color: var(--text-primary);
    margin: var(--spacing-lg) 0 var(--spacing-md);
    padding-top: var(--spacing-sm);
}

.challenge-content p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.challenge-content strong {
    color: var(--text-primary);
}



/* Project Navigation */
.project-navigation {
    padding: var(--spacing-xl) 0;
    background: white;
    border-top: 1px solid var(--border-color);
}

.nav-links {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
}

.nav-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

.nav-btn.prev i {
    order: -1;
}

.nav-btn.next i {
    order: 1;
}

/* Text Navigation Links */
.nav-link-text {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: color 0.3s ease, transform 0.3s ease;
    padding: var(--spacing-sm);
}

.nav-link-text:hover {
    color: var(--accent-color);
    transform: translateX(5px);
}

/* Contact Section */
.contact-section {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-warm);
    border-top: 1px solid var(--border-color);
}

.contact-section .section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.contact-simple {
    max-width: 1000px;
    margin: 0 auto;
}

.contact-intro {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.contact-intro h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-xl);
}

.contact-intro p {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    line-height: 1.6;
}

/* Architecture Section Styles */
.architecture-section {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

.architecture-diagram {
    max-width: 1000px;
    margin: 0 auto;
}

.arch-level {
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.arch-level h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-xl);
}

.arch-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.arch-item {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.arch-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.arch-item.main-screen {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    max-width: 400px;
    margin: 0 auto;
}

.arch-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.main-screen .arch-icon {
    background: rgba(255, 255, 255, 0.2);
}

.arch-icon i {
    font-size: var(--font-size-lg);
    color: white;
}

.arch-item h3, .arch-item h5 {
    margin-bottom: var(--spacing-sm);
}

.main-screen h3 {
    color: white;
}

/* Business Model Section */
.business-model-section {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.business-card {
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.business-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.business-icon i {
    font-size: var(--font-size-2xl);
    color: white;
}

.business-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.business-card ul {
    list-style: none;
    padding: 0;
    text-align: left;
}

.business-card li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.business-card li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

/* Data Analysis Section */
.data-analysis-section {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.analysis-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.analysis-item {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border-top: 4px solid var(--primary-color);
}

.analysis-item h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.analysis-item > p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.analysis-item ul {
    list-style: none;
    padding: 0;
}

.analysis-item li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.analysis-item li::before {
    content: '📊';
    position: absolute;
    left: 0;
}

/* Indicators Section */
.indicators-section {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

.indicators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.indicator-category {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
}

.indicator-category h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-color);
}

.indicator-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.indicator-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
}

.indicator-item i {
    font-size: var(--font-size-lg);
    color: var(--primary-color);
    width: 24px;
    text-align: center;
}

.indicator-item span {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Competitive Section */
.competitive-section {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.competitive-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.competitive-item {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border-left: 6px solid var(--primary-color);
}

.competitive-item h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.competitive-item ul {
    list-style: none;
    padding: 0;
}

.competitive-item li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.competitive-item li::before {
    content: '🎯';
    position: absolute;
    left: 0;
}

/* Project4 Specific Styles */
.project-vision {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.vision-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.vision-text h2 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.vision-text h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.vision-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.feature-item {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.feature-item i {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.feature-item h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.positioning-section {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

.positioning-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.positioning-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-color);
}

.card-header i {
    font-size: var(--font-size-xl);
    color: var(--primary-color);
}

.card-header h3 {
    color: var(--text-primary);
    margin: 0;
}

.feature-planning {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.planning-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.planning-phase h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-2xl);
}

.phase-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    border-left: 4px solid var(--primary-color);
}

.feature-card h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.design-philosophy {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

/* Product design - mobile big image + text cards */
.pd-feature {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.pd-feature-media {
    width: 100%;
    background: var(--bg-secondary);
    display: flex;
    justify-content: center;
    padding: var(--spacing-sm);
}

.pd-feature-media img {
    width: var(--mobile-screen-width, 300px);
    height: auto;
    max-width: 100%;
    object-fit: contain;
    display: block;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
}

/* 阶梯式图片排列样式 */
.pd-feature-media1 {
    position: relative;
    height: 500px;
    width: 100%;
}

.pd-feature-media1 img {
    position: absolute;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    width: 375px;
    height: auto;
    object-fit: cover;
}

.pd-feature-media1 img:nth-child(1) {
    top: 0;
    left: 0;
    z-index: 1;
}

.pd-feature-media1 img:nth-child(2) {
    top: 190px;
    left: 180px;
    z-index: 2;
}

.pd-feature-media1 img:nth-child(3) {
    top: 380px;
    left: 360px;
    z-index: 3;
}


.pd-feature-text {
    padding: var(--spacing-md);
}
.pd-text-top {
    align-self: flex-start;
    margin-top: 100px;
    padding-top: 0;
}

.pd-feature-text h5 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-lg);
}

.pd-feature-text p {
    color: var(--text-secondary);
}

/* Ensure 1:1 screenshot feel on mobile */
@media (max-width: 768px) {
    .pd-feature-media img {
        width: 100%;
    }
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.philosophy-item {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    text-align: center;
}

.philosophy-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.philosophy-icon i {
    font-size: var(--font-size-2xl);
    color: white;
}

.philosophy-item h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.design-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    text-align: left;
}

.design-details span {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.progress-section {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.progress-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.progress-timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
}

.progress-item {
    position: relative;
    margin-bottom: var(--spacing-xl);
    padding-left: 80px;
}

.progress-item::before {
    content: '';
    position: absolute;
    left: 21px;
    top: 0;
    width: 18px;
    height: 18px;
    background-color: var(--primary-color);
    border: 4px solid white;
    border-radius: 50%;
    box-shadow: var(--shadow-medium);
}

.progress-item.current::before {
    background-color: var(--accent-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(255, 167, 38, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(255, 167, 38, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 167, 38, 0); }
}

.progress-date {
    position: absolute;
    left: -60px;
    top: 0;
    background-color: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    white-space: nowrap;
}

.progress-content {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
}

.progress-content h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

/* Minimal progress style */
.progress-minimal {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.progress-mini-item {
    display: grid;
    grid-template-columns: 16px 110px 1fr;
    align-items: center;
    gap: var(--spacing-md);
    padding: 10px 0;
}

.progress-mini-item .mini-dot {
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    display: inline-block;
}

.progress-mini-item .mini-time {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.progress-mini-item .mini-desc {
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .progress-mini-item {
        grid-template-columns: 14px 90px 1fr;
        gap: var(--spacing-sm);
    }
    .progress-mini-item .mini-time { font-size: 12px; }
}

.challenges-learning {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

.learning-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.learning-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
}

.learning-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
}

.learning-content p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.learning-content strong {
    color: var(--text-primary);
}

.future-vision {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.vision-roadmap {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.roadmap-item {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.roadmap-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.roadmap-icon i {
    font-size: var(--font-size-2xl);
    color: white;
}

.roadmap-item h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.roadmap-item ul {
    list-style: none;
    padding: 0;
    text-align: left;
}

.roadmap-item li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.roadmap-item li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Project3 Simplified Styles */
.project-summary {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.summary-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.summary-card {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border-top: 4px solid var(--primary-color);
}

.summary-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.summary-card ul {
    list-style: none;
    padding: 0;
}

.summary-card li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.summary-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.key-learnings {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

.learnings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.learning-item {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    text-align: center;
}

.learning-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.learning-icon i {
    font-size: var(--font-size-2xl);
    color: white;
}

.learning-item h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.learning-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .project-header .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .project-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .overview-grid,
    .results-grid,
    .challenges-grid,
    .lessons-content {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .feature-card {
        padding: var(--spacing-md);
    }
    
    .nav-links {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav-btn {
        width: 100%;
        justify-content: center;
    }
    
    .nav-link-text {
        text-align: center;
        display: block;
        width: 100%;
    }
    
    .contact-info-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    /* Project4 Responsive */
    .vision-content {
        grid-template-columns: 1fr;
    }
    
    .vision-features {
        order: -1;
        flex-direction: row;
        justify-content: space-around;
    }
    
    .progress-timeline::before {
        left: 20px;
    }
    
    .progress-item {
        padding-left: 60px;
    }
    
    .progress-item::before {
        left: 11px;
    }
    
    .progress-date {
        position: static;
        display: inline-block;
        margin-bottom: var(--spacing-sm);
    }
    
    /* Project3 Responsive */
    .summary-content {
        grid-template-columns: 1fr;
    }
    
    .learnings-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .project-title {
        font-size: var(--font-size-3xl);
    }
    
    .project-stats {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
}

/* Project2 Specific Styles */
.project2-features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.project2-features-grid .feature-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project2-features-grid .feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-large);
}

/* Responsive adjustments for project2 */
@media (max-width: 1024px) {
    .project2-features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .project2-features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .project2-features-grid .feature-card {
        padding: var(--spacing-md);
    }
}

/* Work Outputs Section */
.work-outputs-section {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

.work-outputs-section .section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}


/* 流程图图片样式 */
.flow-image-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: var(--spacing-xl) auto;
}

.flow-image-wrapper img {
    max-width: 600px;
    height: auto;
    /* border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light); */
}

/* Product Design Showcase - Horizontal scroll + phone frame */
.product-design .phase-features {
    display: flex;
    overflow-x: auto;
    gap: var(--spacing-lg);
    padding: 4px 8px var(--spacing-md);
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
}

.product-design .phase-features::-webkit-scrollbar { height: 8px; }
.product-design .phase-features::-webkit-scrollbar-thumb {
    background: rgba(0,0,0,0.15);
    border-radius: 4px;
}

/* 单卡片设置为可横滑的"页" */
.product-design .pd-feature {
    background: transparent;
    border: none;
    box-shadow: none;
    flex: 0 0 auto;
    width: var(--phone-card-width, 420px);
    scroll-snap-align: center;
}

/* 手机机身效果容器 */
.product-design .pd-feature-media {
    position: relative;
    width: 100%;
    background: #000;
    display: flex;
    justify-content: center;
    padding: 16px;
    border-radius: 28px;
    border: 1px solid rgba(0,0,0,0.15);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

/* 顶部听筒/刘海 */
.product-design .pd-feature-media::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 28%;
    height: 10px;
    background: #111;
    border-radius: 16px;
}

/* 屏幕内的截图：原图比例显示 */
.product-design .pd-feature-media img {
    width: var(--mobile-screen-width, 300px);
    height: auto;
    max-width: 100%;
    object-fit: contain;
    display: block;
    border-radius: 18px;
    box-shadow: none;
}

/* 说明文案居中 */
.product-design .pd-feature-text {
    text-align: center;
    padding: var(--spacing-sm) 0 0;
}

/* 移动端宽度自适应 */
@media (max-width: 768px) {
    .product-design .pd-feature { width: 88vw; }
    .product-design .pd-feature-media img { width: 100%; }
}

/* 新增：垂直布局样式 - 单列上下排版，左图右字和右图左字交替 */
.product-design .phase-features-vertical {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
}

.product-design .pd-feature-vertical {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    background: transparent;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
}

.product-design .pd-feature-vertical.left-image {
    grid-template-columns: 1fr 1fr;
}

.product-design .pd-feature-vertical.left-image .pd-feature-media {
    justify-self: end;
}

.product-design .pd-feature-vertical.left-image .pd-feature-text {
    justify-self: start;
    text-align: left;
}

.product-design .pd-feature-vertical.right-image {
    grid-template-columns: 1fr 1fr;
}

.product-design .pd-feature-vertical.right-image .pd-feature-media {
    justify-self: start;
}

.product-design .pd-feature-vertical.right-image .pd-feature-text {
    justify-self: end;
    text-align: right;
}

.product-design .pd-feature-vertical .pd-feature-media {
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    position: static;
}

.product-design .pd-feature-vertical .pd-feature-media::before {
    display: none;
}

.product-design .pd-feature-vertical .pd-feature-media img {
    height: auto;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
}

.product-design .pd-feature-vertical .pd-feature-text {
    text-align: left;
    padding: 0;
}

.product-design .pd-feature-vertical .pd-feature-text h5 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.product-design .pd-feature-vertical .pd-feature-text p {
    font-size: var(--font-size-lg);
    line-height: 1.6;
    color: var(--text-secondary);
}

/* 移动端响应式 */
@media (max-width: 768px) {
    .product-design .pd-feature-vertical {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        padding: 0;
    }
    
    .product-design .pd-feature-vertical .pd-feature-text {
        text-align: center;
        justify-self: center;
    }
    
    .product-design .pd-feature-vertical .pd-feature-media {
        justify-self: center;
    }
    
    .product-design .pd-feature-vertical .pd-feature-text h5 {
        font-size: var(--font-size-lg);
    }
    
    .product-design .pd-feature-vertical .pd-feature-text p {
        font-size: var(--font-size-md);
    }
}