/* ============================================
   Section-specific Layouts
   Multi-page aware
   ============================================ */


/* ===========================
   NAVBAR
   =========================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.navbar--scrolled {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: var(--shadow-sm);
}

.navbar__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.navbar__logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
}

.navbar__logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--gradient-primary);
    color: #fff;
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 800;
}

.navbar__logo-text {
    font-family: var(--font-heading);
    font-size: var(--text-base);
    font-weight: 700;
    color: var(--color-text);
}

.navbar__links {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.navbar__link {
    padding: 0.4rem 0.75rem;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.navbar__link:hover,
.navbar__link--active {
    color: var(--color-primary);
    background: rgba(67, 56, 202, 0.06);
}

.navbar__cta {
    margin-left: var(--space-md);
}

/* Hamburger */
.navbar__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: var(--z-overlay);
}

.navbar__hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.navbar__hamburger--active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.navbar__hamburger--active span:nth-child(2) {
    opacity: 0;
}

.navbar__hamburger--active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile nav panel */
.navbar__mobile {
    display: none;
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: calc(var(--nav-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
    transition: right var(--transition-base);
    z-index: var(--z-overlay);
    box-shadow: -4px 0 30px rgba(0, 0, 0, 0.1);
}

.navbar__mobile--open {
    right: 0;
}

.navbar__mobile-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.navbar__mobile-links .navbar__link {
    font-size: var(--text-base);
    padding: var(--space-sm) var(--space-md);
}


/* ===========================
   SCROLL PROGRESS
   =========================== */

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--gradient-primary);
    z-index: calc(var(--z-sticky) + 1);
    transition: width 0.1s linear;
}


/* ===========================
   HERO
   =========================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: var(--gradient-hero);
}

.hero__mesh {
    position: absolute;
    inset: 0;
    background: var(--gradient-mesh);
    pointer-events: none;
}

.hero__particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.18;
    pointer-events: none;
}

.hero__content {
    position: relative;
    z-index: var(--z-base);
    text-align: center;
    padding: var(--space-2xl) var(--space-lg);
    max-width: 800px;
}

/* Hero badge (glass pill) */
.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-glass-strong);
    border: 1px solid var(--color-glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    padding: 0.4rem 1.2rem;
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.hero__badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-success);
    animation: pulse 2s ease-in-out infinite;
}

/* Hero title structure */
.hero__title {
    margin-bottom: var(--space-lg);
}

.hero__title-small {
    display: block;
    font-family: var(--font-body);
    font-size: var(--text-xl);
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
    letter-spacing: 0.02em;
}

.hero__title-big {
    display: block;
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 900;
    line-height: 1.1;
}

.hero__title-accent {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% auto;
    animation: gradientShift 4s ease-in-out infinite;
}

.hero__cursor {
    color: var(--color-primary);
    animation: blink 1s infinite;
    font-weight: 300;
}

/* Hero narrative */
.hero__narrative {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero__narrative strong {
    color: var(--color-primary);
}

/* Hero metrics row */
.hero__metrics {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0;
    margin-bottom: var(--space-2xl);
}

/* Hero actions */
.hero__actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Scroll cue */
.hero__scroll-cue {
    position: absolute;
    bottom: var(--space-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.hero__scroll-text {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-light);
}

.hero__scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    animation: scrollLine 2s ease-in-out infinite;
}


/* ===========================
   EVOLUTION (eras grid)
   =========================== */

.eras {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}


/* ===========================
   IMPACT (dark section)
   =========================== */

.impact-section {
    overflow: hidden;
    position: relative;
}

.impact-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(67, 56, 202, 0.15) 0%, transparent 60%);
    pointer-events: none;
}

.impact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
}


/* ===========================
   EXPERTISE (bento-style)
   =========================== */

.expertise-domains {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}


/* ===========================
   WORK SHOWCASE
   =========================== */

.work-showcase {
    display: grid;
    gap: var(--space-xl);
}


/* ===========================
   RESEARCH STATS
   =========================== */

.research-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}


/* ===========================
   CREDENTIALS
   =========================== */

.credentials-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
}

.credentials-col {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.credentials__heading {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.credentials__heading i {
    color: var(--color-primary);
}


/* ===========================
   BLOG GRID
   =========================== */

.blog__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-xl);
}


/* ===========================
   CONTACT
   =========================== */

.contact__grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: var(--space-2xl);
    max-width: 950px;
    margin: 0 auto;
}

.contact__channels {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.contact__form {
    display: flex;
    flex-direction: column;
}


/* ===========================
   FOOTER
   =========================== */

.footer {
    background: var(--color-bg-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: var(--space-3xl) 0 var(--space-lg);
}

.footer__content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-2xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    margin-bottom: var(--space-lg);
}

.footer__brand p {
    color: rgba(255, 255, 255, 0.4);
    font-size: var(--text-sm);
    margin: var(--space-sm) 0 0;
}

.footer__nav {
    display: flex;
    gap: var(--space-lg);
}

.footer__nav a {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--text-sm);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer__nav a:hover {
    color: #fff;
}

.footer__social {
    display: flex;
    gap: var(--space-lg);
}

.footer__social a {
    color: rgba(255, 255, 255, 0.5);
    font-size: 1.1rem;
    transition: all var(--transition-fast);
}

.footer__social a:hover {
    color: #fff;
    transform: translateY(-2px);
}

.footer__bottom {
    text-align: center;
}

.footer__bottom p {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.3);
    margin: 0;
}


/* ===========================
   PAGE HERO (inner pages)
   =========================== */

.page-hero {
    padding: calc(var(--nav-height) + var(--space-4xl)) 0 var(--space-3xl);
    background: var(--gradient-hero);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-mesh);
    pointer-events: none;
}

.page-hero .container {
    position: relative;
    z-index: 1;
}

.page-hero__label {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
    display: block;
}

.page-hero__title {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 900;
    margin-bottom: var(--space-md);
}

.page-hero__desc {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    max-width: 650px;
    margin: 0 auto;
}


/* ===========================
   JOURNEY TIMELINE (vertical)
   =========================== */

.journey-timeline {
    position: relative;
    padding: var(--space-xl) 0;
}

/* Gradient center line */
.journey-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 100%;
    background: linear-gradient(
        to bottom,
        var(--era-foundation),
        var(--era-bigdata),
        var(--era-deeplearning),
        var(--era-genai)
    );
    top: 0;
    border-radius: 3px;
}

/* Timeline entry */
.journey-entry {
    position: relative;
    width: 50%;
    margin-bottom: var(--space-3xl);
}

.journey-entry:nth-child(odd) {
    left: 0;
    padding-right: var(--space-3xl);
    text-align: right;
}

.journey-entry:nth-child(even) {
    left: 50%;
    padding-left: var(--space-3xl);
}

/* Center dot */
.journey-entry__dot {
    position: absolute;
    top: var(--space-lg);
    width: 18px;
    height: 18px;
    background: var(--entry-color, var(--color-primary));
    border: 3px solid var(--color-bg);
    border-radius: 50%;
    z-index: var(--z-base);
    box-shadow: 0 0 0 4px rgba(67, 56, 202, 0.15);
}

.journey-entry:nth-child(odd) .journey-entry__dot {
    right: -9px;
}

.journey-entry:nth-child(even) .journey-entry__dot {
    left: -9px;
}

/* Entry card */
.journey-entry__card {
    text-align: left;
    border-left: 3px solid var(--entry-color, var(--color-primary));
}

.journey-entry__era {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--entry-color, var(--color-primary));
    margin-bottom: var(--space-xs);
}

.journey-entry__year {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
    display: block;
}

.journey-entry__role {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.journey-entry__company {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.journey-entry__desc {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
    line-height: 1.7;
}

.journey-entry__metrics {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.journey-entry__metric {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.journey-entry__metric strong {
    color: var(--entry-color, var(--color-primary));
    font-size: var(--text-lg);
}


/* ===========================
   CASE STUDY (work page)
   =========================== */

.case-study {
    border-left: 4px solid var(--case-color, var(--color-primary));
    padding: var(--space-2xl);
    margin-bottom: var(--space-xl);
}

.case-study__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.case-study__company {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--case-color, var(--color-primary));
}

.case-study__period {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-text-light);
}

.case-study__title {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 800;
    margin-bottom: var(--space-md);
}

.case-study__role {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.35rem 1rem;
    background: rgba(67, 56, 202, 0.05);
    border-radius: var(--radius-full);
}

/* 2-column body: narrative + sidebar */
.case-study__body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.case-study__narrative {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.case-study__narrative p {
    color: var(--color-text-secondary);
}

.case-study__sidebar {
    /* sidebar container */
}

.case-study__metrics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.case-study__metric {
    text-align: center;
    padding: var(--space-md);
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
}

.case-study__metric-value {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 800;
    color: var(--case-color, var(--color-primary));
}

.case-study__metric-label {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

.case-study__tech h4 {
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.case-study__tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}