/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: 'JetBrains Mono', 'Courier New', 'Courier', monospace;
    font-weight: 400;
    line-height: 1.6;
    color: #1a1a1a;
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 40px 20px;
    min-height: 100vh;
}

/* Main Content */
.main {
    max-width: 520px;
}

/* Profile Section */
.profile-section {
    margin-bottom: 0;
}

.profile-img {
    width: 240px;
    height: 240px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 32px;
    display: block;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: high-quality;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    transform: translateZ(0);
    -webkit-font-smoothing: subpixel-antialiased;
}

.name {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 24px;
    color: #1a1a1a;
    line-height: 1.2;
}

.bio-title {
    font-size: 17px;
    line-height: 1.7;
    color: #4a4a4a;
    margin-bottom: 16px;
}

.bio-list {
    list-style: none;
    padding: 0;
    margin-bottom: 32px;
}

.bio-list li {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
    margin-bottom: 6px;
    padding-left: 16px;
    position: relative;
}

.bio-list li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: #999;
}

/* Social Links */
.social-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.social-link {
    color: #666;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease;
}

.social-link svg {
    width: 20px;
    height: 20px;
    display: block;
}

.social-link:hover {
    color: #1a1a1a;
}

/* Section Divider */
.section-divider {
    border: none;
    border-top: 1px solid #e0e0e0;
    margin: 40px 0;
}

/* Content Sections */
.content-section {
    margin-bottom: 48px;
}

.section-title {
    font-size: 17px;
    font-weight: 400;
    color: #1a1a1a;
    margin-bottom: 16px;
}

.bullet-list {
    list-style: none;
    padding: 0;
}

.bullet-list li {
    margin-bottom: 32px;
    padding-left: 20px;
    position: relative;
}

.bullet-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    top: 2px;
    color: #999;
    font-size: 17px;
}

.item-header {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 6px;
}

.item-header a {
    color: #FF312A;
    text-decoration: none;
    font-size: 15px;
    font-weight: 400;
    order: 1;
    border-bottom: 1px solid #d0d0d0;
    transition: border-color 0.2s ease;
    width: fit-content;
}

.item-header a:hover {
    border-bottom-color: #FF312A;
}

.item-title {
    color: #1a1a1a;
    font-size: 15px;
    font-weight: 400;
    order: 1;
    border-bottom: 1px solid #d0d0d0;
    width: fit-content;
    padding-bottom: 2px;
}

.item-date {
    font-size: 12px;
    color: #999;
    font-weight: 400;
    font-variant-numeric: tabular-nums;
    order: 2;
}

.item-description {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
    margin: 0;
    font-weight: 300;
}

/* Collapsible sections */
.collapsible-list li {
    padding-left: 0;
}

.collapsible-list li::before {
    content: none;
}

.collapsible-header {
    cursor: pointer;
    display: flex;
    align-items: baseline;
    gap: 8px;
    user-select: none;
}

.collapsible-header:hover .item-title {
    border-bottom-color: #999;
}

.collapse-indicator {
    color: #999;
    font-size: 16px;
    transition: transform 0.2s ease;
    flex-shrink: 0;
    line-height: 1;
}

.collapsible-item.expanded .collapse-indicator {
    transform: rotate(90deg);
}

.collapsible-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding-left: 24px;
}

.collapsible-item.expanded .collapsible-content {
    max-height: 300px;
}

.collapsible-content .item-date {
    display: block;
    margin-top: 8px;
    margin-bottom: 4px;
}

.collapsible-content .item-description {
    margin-top: 0;
}

/* Detail Pages */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    margin-bottom: 24px;
}

.breadcrumb-link {
    color: #666;
    text-decoration: none;
    transition: color 0.2s ease;
}

.breadcrumb-link:hover {
    color: #1a1a1a;
}

.breadcrumb-separator {
    color: #999;
}

.breadcrumb-current {
    color: #1a1a1a;
}

.back-link {
    display: inline-block;
    color: #666;
    text-decoration: none;
    font-size: 15px;
    margin-bottom: 48px;
    transition: color 0.2s ease;
}

.back-link:hover {
    color: #1a1a1a;
}

.detail-title {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #1a1a1a;
    line-height: 1.2;
}

.project-date {
    font-size: 12px;
    color: #999;
    font-weight: 400;
    font-variant-numeric: tabular-nums;
    margin-bottom: 24px;
}

.detail-content {
    font-size: 17px;
    line-height: 1.7;
    color: #4a4a4a;
}

.detail-content p {
    margin-bottom: 24px;
}

.detail-content p a {
    color: #FF312A;
    text-decoration: none;
    border-bottom: 1px solid #d0d0d0;
    transition: border-color 0.2s ease;
}

.detail-content p a:hover {
    border-bottom-color: #FF312A;
}

.detail-content ul {
    margin-bottom: 24px;
    padding-left: 20px;
    list-style-position: outside;
}

.detail-content ul li a {
    color: #FF312A;
    text-decoration: none;
    border-bottom: 1px solid #d0d0d0;
    transition: border-color 0.2s ease;
}

.detail-content ul li a:hover {
    border-bottom-color: #FF312A;
}

.detail-content strong {
    font-weight: 500;
    color: #1a1a1a;
}

.detail-content h2 {
    font-size: 20px;
    font-weight: 500;
    color: #1a1a1a;
    margin-top: 48px;
    margin-bottom: 20px;
    line-height: 1.3;
}

.detail-content h3 {
    font-size: 17px;
    font-weight: 500;
    color: #1a1a1a;
    margin-top: 48px;
    margin-bottom: 20px;
    line-height: 1.3;
}

.detail-list {
    list-style: none;
    padding: 0;
    margin-bottom: 24px;
}

.detail-list li {
    font-size: 17px;
    line-height: 1.7;
    color: #4a4a4a;
    margin-bottom: 6px;
    padding-left: 16px;
    position: relative;
}

.detail-list li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: #999;
}

.inline-link {
    color: #FF312A;
    text-decoration: none;
    border-bottom: 1px solid #d0d0d0;
    transition: border-color 0.2s ease;
}

.inline-link:hover {
    border-bottom-color: #FF312A;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 32px;
}

.tech-pill {
    display: inline-block;
    padding: 6px 14px;
    background-color: #f5f5f5;
    color: #4a4a4a;
    font-size: 14px;
    font-weight: 400;
    border-radius: 16px;
    border: 1px solid #e0e0e0;
}

.challenge-title {
    scroll-margin-top: 20px;
}

/* Project Detail Pages */
.project-intro {
    margin-bottom: 64px;
}

.intro-text {
    font-size: 17px;
    line-height: 1.7;
    color: #4a4a4a;
    margin-bottom: 16px;
}

.intro-text a {
    color: #FF312A !important;
    text-decoration: underline;
    -webkit-tap-highlight-color: rgba(255, 49, 42, 0.2);
}

.intro-text a:hover,
.intro-text a:active,
.intro-text a:visited {
    color: #FF312A !important;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin-bottom: 32px;
}

.feature-list li {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
    margin-bottom: 6px;
    padding-left: 16px;
    position: relative;
}

.feature-list li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: #999;
}

.feature-list a {
    color: #FF312A !important;
    text-decoration: underline;
    -webkit-tap-highlight-color: rgba(255, 49, 42, 0.2);
}

.feature-list a:hover,
.feature-list a:active,
.feature-list a:visited {
    color: #FF312A !important;
}

.project-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.project-link {
    color: #FF312A;
    text-decoration: none;
    font-size: 15px;
    font-weight: 400;
    padding-bottom: 2px;
    border-bottom: 1px solid #d0d0d0;
    transition: border-color 0.2s ease;
}

.project-link:hover {
    border-bottom-color: #FF312A;
}

/* Carousel */
.carousel-container {
    position: relative;
    max-width: 520px;
    margin: 24px auto 48px;
    overflow: hidden;
}

.carousel-track {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    max-height: 520px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
}

.carousel-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.2s ease-in-out;
}

.carousel-image.active {
    opacity: 1;
}

.carousel-counter {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-top: 12px;
}

.carousel-counter-text {
    font-size: 12px;
    color: #999;
    font-variant-numeric: tabular-nums;
}

.carousel-counter-arrow {
    background: none;
    border: none;
    color: #666;
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    cursor: pointer;
    padding: 4px;
    transition: color 0.2s ease;
}

.carousel-counter-arrow:hover {
    color: #1a1a1a;
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

.lightbox.active {
    display: flex;
}

.lightbox-image {
    width: 600px;
    height: auto;
    max-height: 85vh;
    object-fit: contain;
    user-select: none;
    cursor: default;
}

.lightbox-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
}

.lightbox-counter {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    font-variant-numeric: tabular-nums;
    min-width: 60px;
    text-align: center;
}

.lightbox-arrow {
    background: none;
    border: none;
    color: #ffffff;
    font-family: 'JetBrains Mono', monospace;
    font-size: 24px;
    cursor: pointer;
    padding: 8px 16px;
    transition: color 0.2s ease;
    opacity: 0.7;
}

.lightbox-arrow:hover {
    opacity: 1;
}

/* Responsive Design */
@media (max-width: 640px) {
    .container {
        padding: 32px 16px;
    }

    .profile-section {
        margin-bottom: 0;
    }

    .section-divider {
        margin: 32px 0;
    }

    .profile-img {
        width: 200px;
        height: 200px;
        margin: 0 auto 24px;
        display: block;
    }

    .name {
        font-size: 28px;
        margin-bottom: 20px;
    }

    .bio-title {
        font-size: 16px;
        margin-bottom: 12px;
    }

    .bio-list li {
        font-size: 13px;
    }

    .project-intro {
        margin-bottom: 48px;
    }

    .intro-text {
        font-size: 16px;
        margin-bottom: 12px;
    }

    .feature-list li {
        font-size: 13px;
    }

    .section-title {
        font-size: 16px;
        margin-bottom: 14px;
    }

    .bullet-list li {
        margin-bottom: 28px;
    }

    .item-date {
        font-size: 11px;
    }

    .item-header a {
        font-size: 14px;
    }

    .item-title {
        font-size: 14px;
    }

    .item-description {
        font-size: 13px;
    }

    .collapse-indicator {
        font-size: 14px;
    }

    .content-section {
        margin-bottom: 40px;
    }

    .detail-title {
        font-size: 28px;
    }

    .project-date {
        font-size: 11px;
    }

    .detail-content {
        font-size: 16px;
    }

    .breadcrumbs {
        font-size: 13px;
        margin-bottom: 20px;
    }

    .back-link {
        margin-bottom: 40px;
    }

    .detail-content h2 {
        font-size: 18px;
        margin-top: 40px;
        margin-bottom: 18px;
    }

    .detail-list li {
        font-size: 16px;
    }

    .tech-pill {
        font-size: 13px;
        padding: 5px 12px;
    }

    .carousel-container {
        margin-bottom: 40px;
    }

    .carousel-track {
        max-height: 500px;
    }

    .carousel-counter-text {
        font-size: 11px;
    }

    .carousel-counter-arrow {
        font-size: 12px;
    }

    .lightbox-image {
        width: 90%;
        height: auto;
        max-height: 70vh;
    }

    .lightbox-counter {
        font-size: 12px;
    }

    .lightbox-arrow {
        font-size: 20px;
        padding: 6px 12px;
    }
}