/* ==========================================================================
   Theme Styles — Components, Animations, Layouts
   ========================================================================== */

/* ==========================================================================
   Navigation
   ========================================================================== */

.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-nav);
    background: rgba(10, 17, 32, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-nav.scrolled {
    box-shadow: var(--shadow-lg);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.025em;
    text-decoration: none;
}

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

.nav-brand__icon {
    color: var(--color-accent);
}

.nav-brand__accent {
    color: var(--color-accent);
}

/* Desktop nav */
.nav-desktop {
    display: none;
    align-items: center;
    gap: var(--space-6);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link:focus {
    color: var(--color-accent);
}

.nav-link:hover::after,
.nav-item--active>.nav-link::after {
    width: 100%;
}

.nav-link--cta {
    padding: var(--space-2) var(--space-4);
    background: rgba(0, 229, 255, 0.1);
    color: var(--color-accent);
    border: 1px solid rgba(0, 229, 255, 0.5);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.nav-link--cta::after {
    display: none;
}

.nav-link--cta:hover {
    background: var(--color-accent);
    color: var(--color-bg-primary);
}

/* Theme toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2);
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
    border-radius: var(--radius-md);
}

.theme-toggle:hover {
    color: var(--color-accent);
}

/* Mobile controls */
.nav-mobile-controls {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2);
    background: none;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    border-radius: var(--radius-md);
}

/* Mobile menu */
.mobile-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    display: none;
    box-shadow: var(--shadow-2xl);
}

.mobile-menu.is-open {
    display: block;
    animation: slideDown 0.3s ease;
}

.mobile-menu__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-menu__list a {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.mobile-menu__list a:hover {
    color: var(--color-accent);
}

@media (min-width: 1024px) {
    .nav-desktop {
        display: flex;
    }

    .nav-mobile-controls {
        display: none;
    }
}

/* ==========================================================================
   Scroll Progress Bar
   ========================================================================== */

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--color-accent-gradient);
    z-index: calc(var(--z-nav) + 1);
    transition: width 0.1s linear;
}

/* ==========================================================================
   Background Animations
   ========================================================================== */

.bg-animation {
    position: fixed;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: var(--z-bg);
}

.bg-animation canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.aurora-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    animation: auroraFloat 8s ease-in-out infinite alternate;
}

.aurora-blob--cyan {
    top: -5%;
    left: -5%;
    width: 300px;
    height: 300px;
    background: var(--color-accent);
}

.aurora-blob--blue {
    top: 10%;
    right: -5%;
    width: 280px;
    height: 280px;
    background: var(--color-accent-secondary);
    animation-delay: 2s;
}

.aurora-blob--purple {
    bottom: -10%;
    left: 15%;
    width: 260px;
    height: 260px;
    background: #8B5CF6;
    animation-delay: 4s;
}

/* ==========================================================================
   Glass Panel
   ========================================================================== */

.glass-panel {
    background: var(--color-bg-card);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.glass-panel:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-accent);
}

/* ==========================================================================
   Section Heading
   ========================================================================== */

.section-heading {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-12);
    position: relative;
    display: inline-block;
    padding-bottom: var(--space-3);
}

.section-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--color-accent-gradient);
    border-radius: var(--radius-full);
}

/* ==========================================================================
   Hero Section (Homepage)
   ========================================================================== */

.hero {
    position: relative;
    padding-top: calc(var(--nav-height) + var(--space-16));
    padding-bottom: var(--space-20);
    overflow: hidden;
}

.hero__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-12);
    align-items: start;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    background: rgba(0, 229, 255, 0.1);
    border: 1px solid rgba(0, 229, 255, 0.2);
    color: var(--color-accent);
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero__title {
    font-size: var(--text-5xl);
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: var(--leading-tight);
}

.hero__title-gradient {
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero__title-suffix {
    display: block;
    margin-top: var(--space-2);
    font-size: var(--text-2xl);
    font-family: var(--font-mono);
    color: var(--color-text-muted);
    -webkit-text-fill-color: var(--color-text-muted);
}

.hero__desc {
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    font-weight: 300;
    line-height: var(--leading-relaxed);
}

.hero__desc strong {
    font-weight: 600;
    color: var(--color-text-primary);
}

.hero__cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    padding-top: var(--space-4);
}

.hero__card-icon {
    color: var(--color-accent);
}

.hero__card-icon--alt {
    color: var(--color-accent-secondary);
}

.hero__card h3 {
    font-size: var(--text-sm);
    font-weight: 700;
}

.hero__card p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    padding-top: var(--space-6);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-5);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    cursor: pointer;
    line-height: 1.5;
}

.btn--primary {
    background: var(--color-accent);
    color: var(--color-bg-primary);
    border-color: var(--color-accent);
}

.btn--primary:hover {
    background: rgba(0, 229, 255, 0.8);
    color: var(--color-bg-primary);
    box-shadow: var(--shadow-accent);
}

.btn--secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.btn--secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-text-primary);
}

.btn--secondary img {
    width: 20px;
    height: 20px;
    filter: invert(1);
}

/* Hero right visual */
.hero__visual {
    position: relative;
    display: none;
}

.hero__photo-wrap {
    border-radius: var(--radius-2xl);
    overflow: hidden;
    transform: rotate(2deg);
    transition: transform var(--transition-slow);
    box-shadow: var(--shadow-2xl);
}

.hero__photo-wrap:hover {
    transform: rotate(0deg);
}

.hero__photo-wrap img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    background: var(--color-bg-tertiary);
}

.hero__stat {
    position: absolute;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
}

.hero__stat--left {
    bottom: -24px;
    left: -24px;
    padding: var(--space-4);
    border-left: 4px solid var(--color-accent);
}

.hero__stat--right {
    top: 40px;
    right: -24px;
    padding: var(--space-4);
    border-left: 4px solid var(--color-accent-secondary);
}

.hero__stat-value {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.hero__stat-label {
    font-size: var(--text-xs);
    text-transform: uppercase;
    color: var(--color-text-muted);
}

@media (min-width: 1024px) {
    .hero__grid {
        grid-template-columns: 7fr 5fr;
    }

    .hero__visual {
        display: block;
    }

    .hero__title {
        font-size: var(--text-6xl);
    }
}

/* ==========================================================================
   Sections (Generic)
   ========================================================================== */

.section {
    padding: var(--space-20) 0;
    position: relative;
    z-index: var(--z-content);
}

.section--alt {
    background: var(--color-bg-secondary);
}

/* ==========================================================================
   Education Timeline
   ========================================================================== */

.edu-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.edu-card {
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    position: relative;
}

.edu-card__header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    margin-bottom: var(--space-3);
}

.edu-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    min-width: 48px;
    border-radius: var(--radius-lg);
    background: rgba(0, 229, 255, 0.1);
    color: var(--color-accent);
}

.edu-card__degree {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.edu-card__school {
    font-size: var(--text-sm);
    color: var(--color-accent);
    margin-top: var(--space-1);
}

.edu-card__period {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

.edu-card__details {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}

.edu-card__thesis {
    margin-top: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    background: rgba(0, 229, 255, 0.05);
    border-left: 3px solid var(--color-accent);
    font-size: var(--text-sm);
}

.edu-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: var(--space-4);
}

.edu-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.edu-prior {
    display: none;
    margin-top: var(--space-4);
}

.edu-prior.is-open {
    display: block;
}

/* ==========================================================================
   Experience
   ========================================================================== */

.exp-filters {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-8);
    flex-wrap: wrap;
}

.exp-filter-btn {
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.exp-filter-btn.active,
.exp-filter-btn:hover {
    background: var(--color-accent);
    color: var(--color-bg-primary);
    border-color: var(--color-accent);
}

.exp-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.exp-card {
    padding: var(--space-6);
    border-radius: var(--radius-xl);
}

.exp-card[data-type] {
    display: block;
}

.exp-card.is-hidden {
    display: none;
}

.exp-card__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
}

.exp-card__role {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.exp-card__type {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.exp-card__type--academic {
    background: rgba(0, 229, 255, 0.1);
    color: var(--color-accent);
}

.exp-card__type--industry {
    background: rgba(139, 92, 246, 0.1);
    color: #A78BFA;
}

.exp-card__org {
    font-size: var(--text-sm);
    color: var(--color-accent);
    margin-bottom: var(--space-1);
}

.exp-card__period {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    margin-bottom: var(--space-3);
}

.exp-card__desc {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}

/* ==========================================================================
   Research & Publications
   ========================================================================== */

.research-tabs {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-8);
    flex-wrap: wrap;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-2);
}

.research-tab {
    padding: var(--space-2) var(--space-4);
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    font-weight: 500;
}

.research-tab.active {
    color: var(--color-accent);
}

.research-tab.active::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-accent);
}

.research-panel {
    display: none;
}

.research-panel.active {
    display: block;
}

.pub-item {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3);
}

.pub-item__title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.pub-item__title a {
    color: var(--color-text-primary);
    text-decoration: none;
}

.pub-item__title a:hover {
    color: var(--color-accent);
}

.pub-item__authors {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-1);
}

.pub-item__venue {
    font-size: var(--text-sm);
    font-style: italic;
    color: var(--color-text-secondary);
}

/* ==========================================================================
   Service & Mentorship
   ========================================================================== */

.service-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
}

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

.service-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.service-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
}

.service-list li .icon {
    color: var(--color-accent);
    flex-shrink: 0;
}

/* ==========================================================================
   Awards
   ========================================================================== */

.awards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
}

@media (min-width: 768px) {
    .awards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.award-card {
    padding: var(--space-5);
    border-radius: var(--radius-xl);
}

.award-card__icon {
    color: #FBBF24;
    margin-bottom: var(--space-2);
}

.award-card__title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.award-card__org {
    font-size: var(--text-sm);
    color: var(--color-accent);
}

.award-card__year {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    text-align: center;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    align-items: center;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-base);
    color: var(--color-text-secondary);
}

.contact-item .icon {
    color: var(--color-accent);
}

/* ==========================================================================
   Blog Cards
   ========================================================================== */

.blog-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 640px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .blog-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.blog-card {
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.blog-card:hover {
    transform: translateY(-4px);
}

.blog-card__image {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    background: var(--color-bg-tertiary);
}

.blog-card__body {
    padding: var(--space-5);
}

.blog-card__date {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    margin-bottom: var(--space-2);
}

.blog-card__title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
    line-height: var(--leading-tight);
}

.blog-card__title a {
    color: inherit;
    text-decoration: none;
}

.blog-card__title a:hover {
    color: var(--color-accent);
}

.blog-card__excerpt {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-3);
}

.blog-card__footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.blog-card__readtime {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.blog-card__more {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-accent);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

/* ==========================================================================
   Post Tags / Chips
   ========================================================================== */

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tag-chip {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    color: var(--color-accent);
    background: rgba(0, 229, 255, 0.1);
    border: 1px solid rgba(0, 229, 255, 0.2);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.tag-chip:hover {
    background: var(--color-accent);
    color: var(--color-bg-primary);
}

/* ==========================================================================
   Single Post
   ========================================================================== */

.single-post-header {
    padding-top: calc(var(--nav-height) + var(--space-16));
    padding-bottom: var(--space-8);
    text-align: center;
}

.single-post-header__back {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
    text-decoration: none;
}

.single-post-header__back:hover {
    color: var(--color-accent);
}

.single-post-header__title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-4);
}

.single-post-header__meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    flex-wrap: wrap;
}

.single-post-header__author {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.single-post-header__avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.single-post-content {
    max-width: 720px;
    margin: 0 auto;
    padding-bottom: var(--space-16);
}

.single-post-content h2,
.single-post-content h3,
.single-post-content h4 {
    margin-top: var(--space-8);
    margin-bottom: var(--space-4);
}

.single-post-content p {
    margin-bottom: var(--space-4);
    line-height: var(--leading-relaxed);
}

.single-post-content blockquote {
    margin: var(--space-6) 0;
    padding: var(--space-4) var(--space-6);
    border-left: 4px solid var(--color-accent);
    background: var(--color-bg-card);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--color-text-secondary);
}

.single-post-content pre {
    margin: var(--space-6) 0;
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    font-size: var(--text-sm);
    border: 1px solid var(--color-border);
}

.single-post-content code {
    font-size: 0.875em;
    padding: 0.2em 0.4em;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
}

.single-post-content pre code {
    padding: 0;
    background: none;
}

.single-post-content img {
    border-radius: var(--radius-lg);
    margin: var(--space-6) auto;
}

.single-post-content ul,
.single-post-content ol {
    margin-bottom: var(--space-4);
    padding-left: var(--space-6);
}

.single-post-content li {
    margin-bottom: var(--space-2);
}

/* Post nav (prev/next) */
.post-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
}

.post-nav-link {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    text-decoration: none;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.post-nav-link:hover {
    border-color: var(--color-accent);
}

.post-nav-link__label {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    display: block;
    margin-bottom: var(--space-1);
}

.post-nav-link__title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-primary);
}

.post-nav-link--next {
    text-align: right;
}

/* ==========================================================================
   Travel Page
   ========================================================================== */

.travel-header {
    padding-top: calc(var(--nav-height) + var(--space-16));
    padding-bottom: var(--space-8);
    text-align: center;
}

.travel-timeline {
    position: relative;
    padding: var(--space-8) 0;
}

.travel-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
    transform: translateX(-50%);
}

.travel-item {
    display: flex;
    justify-content: flex-end;
    width: 50%;
    padding-right: var(--space-10);
    margin-bottom: var(--space-8);
    position: relative;
}

.travel-item:nth-child(even) {
    justify-content: flex-start;
    margin-left: 50%;
    padding-right: 0;
    padding-left: var(--space-10);
}

.travel-item__dot {
    position: absolute;
    right: -8px;
    top: var(--space-4);
    width: 16px;
    height: 16px;
    background: var(--color-bg-primary);
    border: 3px solid var(--color-accent);
    border-radius: 50%;
    box-shadow: 0 0 12px rgba(0, 229, 255, 0.3);
    z-index: 5;
}

.travel-item:nth-child(even) .travel-item__dot {
    right: auto;
    left: -8px;
}

.travel-card {
    padding: var(--space-5);
    border-radius: var(--radius-xl);
    max-width: 400px;
}

.travel-card__emoji {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-2);
}

.travel-card__year {
    display: inline-block;
    font-size: var(--text-xs);
    font-family: var(--font-mono);
    color: var(--color-accent);
    background: rgba(0, 229, 255, 0.1);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-2);
}

.travel-card__city {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.travel-card__country {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.travel-card__type {
    display: inline-block;
    font-size: var(--text-xs);
    margin-top: var(--space-2);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-full);
    background: rgba(139, 92, 246, 0.1);
    color: #A78BFA;
}

/* Travel Gallery */
.travel-gallery {
    position: absolute;
    top: 20px;
    width: 200px;
    height: 150px;
    z-index: 1;
}

/* Odd items: Card on Right side of timeline, Gallery also on Right (outer edge) */
.travel-item .travel-gallery {
    right: 0;
    left: auto;
    /* Position just outside the card, to the right */
    transform: translateX(calc(100% + var(--space-4)));
}

/* Even items: Card on Left side of timeline, Gallery also on Left (outer edge) */
.travel-item:nth-child(even) .travel-gallery {
    left: 0;
    right: auto;
    /* Position just outside the card, to the left */
    transform: translateX(calc(-100% - var(--space-4)));
}

.travel-gallery__item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 4px solid #fff;
    box-shadow: var(--shadow-lg);
    background: var(--color-bg-card);
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    transform-origin: center bottom;

    /* Stack effect using CSS var --i from HTML */
    transform: rotate(calc(var(--i) * 3deg - 3deg)) translateY(calc(var(--i) * 2px));
    z-index: calc(3 - var(--i));
}

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

/* Hover Effects */
.travel-gallery:hover .travel-gallery__item {
    /* Fan out */
    transform: rotate(calc(var(--i) * 8deg - 8deg)) translate(calc(var(--i) * 60px - 60px), calc(var(--i) * 10px));
    box-shadow: var(--shadow-xl);
}

.travel-gallery:hover .travel-gallery__item:hover {
    transform: scale(1.1) rotate(0) translate(0, -10px);
    z-index: 10;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    border-color: var(--color-accent);
}

/* Travel responsive — stack on mobile */
@media (max-width: 768px) {
    .travel-timeline::before {
        left: 20px;
    }

    .travel-item,
    .travel-item:nth-child(even) {
        width: 100%;
        margin-left: 0;
        padding-right: 0;
        padding-left: calc(20px + var(--space-8));
        padding-left: calc(20px + var(--space-8));
        justify-content: flex-start;
        /* Ensure stacking context for gallery on mobile */
        flex-direction: column;
        align-items: flex-start;
    }

    /* Adjust gallery for mobile */
    .travel-item .travel-gallery,
    .travel-item:nth-child(even) .travel-gallery {
        position: relative;
        width: 100%;
        max-width: 300px;
        height: 200px;
        top: auto;
        left: auto;
        right: auto;
        transform: none;
        margin-top: var(--space-6);
        margin-bottom: var(--space-4);
    }

    .travel-item__dot,
    .travel-item:nth-child(even) .travel-item__dot {
        left: 12px;
        right: auto;
    }
}

/* ==========================================================================
   About Page
   ========================================================================== */

.about-header {
    padding-top: calc(var(--nav-height) + var(--space-16));
    padding-bottom: var(--space-8);
}

.about-content {
    max-width: 720px;
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--color-text-secondary);
}

.about-content p {
    margin-bottom: var(--space-4);
}

.about-timeline {
    margin-top: var(--space-12);
}

.about-timeline__item {
    display: flex;
    gap: var(--space-6);
    padding: var(--space-6) 0;
    border-bottom: 1px solid var(--color-border);
}

.about-timeline__dot {
    width: 12px;
    height: 12px;
    min-width: 12px;
    border-radius: 50%;
    background: var(--color-accent);
    margin-top: var(--space-1);
}

.about-timeline__title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.about-timeline__subtitle {
    font-size: var(--text-sm);
    color: var(--color-accent);
    margin-top: var(--space-1);
}

.about-timeline__period {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    margin-top: var(--space-1);
}

/* ==========================================================================
   404 Page
   ========================================================================== */

.error-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--nav-height));
    text-align: center;
    padding-top: var(--nav-height);
}

.error-page__code {
    font-size: 8rem;
    font-weight: 800;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: var(--space-4);
}

.error-page__title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-4);
}

.error-page__desc {
    color: var(--color-text-muted);
    margin-bottom: var(--space-8);
    max-width: 400px;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
    padding: var(--space-12) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    position: relative;
    z-index: var(--z-content);
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
    text-align: center;
}

.footer-brand__link {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    text-decoration: none;
}

.footer-brand__accent {
    color: var(--color-accent);
}

.footer-brand__tagline {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

.footer-social {
    display: flex;
    gap: var(--space-4);
}

.footer-social__link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    color: var(--color-text-muted);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.footer-social__link:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.footer-copyright {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ==========================================================================
   Reveal Animations
   ========================================================================== */

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-up {
    animation: fadeInUp 0.6s ease both;
}

/* ==========================================================================
   Pagination
   ========================================================================== */

.pagination {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-12);
}

.pagination .page-numbers {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.pagination .page-numbers:hover,
.pagination .page-numbers.current {
    background: var(--color-accent);
    color: var(--color-bg-primary);
    border-color: var(--color-accent);
}

/* ==========================================================================
   Keyframe Animations
   ========================================================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes auroraFloat {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(30px, -30px) scale(1.1);
    }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    .no-print {
        display: none !important;
    }

    body {
        background: white;
        color: #333;
    }

    .glass-panel {
        background: #f5f5f5;
        border: 1px solid #ddd;
        backdrop-filter: none;
    }
}

/* ==========================================================================
   Light Mode Nav Adjustments
   ========================================================================== */

body.light-mode .site-nav {
    background: rgba(248, 250, 252, 0.9);
}

body.light-mode .mobile-menu {
    background: var(--color-bg-secondary);
}

/* ==========================================================================
   Custom Scrollbar
   ========================================================================== */

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* ==========================================================================
   Page Header (reusable for archive, about, travel)
   ========================================================================== */

.page-header {
    padding-top: calc(var(--nav-height) + var(--space-16));
    padding-bottom: var(--space-8);
    text-align: center;
}

.page-header__title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-3);
}

.page-header__desc {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================================================
   Share Buttons
   ========================================================================== */

.share-buttons {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-8);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.share-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}