/* =========================================================
   Usma Aktar — Academic Profile
   Palette: parchment paper, ink navy, seal burgundy, slate blue
   Type: Fraunces (display) / Source Sans 3 (body) / IBM Plex Mono (data)
   ========================================================= */

:root {
    --paper: #ffffff;
    --paper-raised: #ffffff;
    --ink: #1e2430;
    --ink-soft: #565c6b;
    --ink-faint: #8a8f9b;
    --seal: #7a2338;
    --seal-soft: #a8455c;
    --slate: #33526e;
    --line: #dad6c9;
    --line-strong: #c7c2b2;

    --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
    --font-body: "Source Sans 3", "Segoe UI", Arial, sans-serif;
    --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;

    --sidebar-w: 300px;
    --content-max: 720px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    * {
        animation: none !important;
        transition: none !important;
    }
}

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--slate);
    text-decoration: none;
}

a:hover,
a:focus-visible {
    text-decoration: underline;
    text-underline-offset: 3px;
}

:focus-visible {
    outline: 2px solid var(--seal);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    background: var(--ink);
    color: #fff;
    padding: 0.75em 1.25em;
    z-index: 200;
}

.skip-link:focus {
    left: 0;
}

img {
    max-width: 100%;
    display: block;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

/* ---------- Layout shell ---------- */

.page {
    display: flex;
    min-height: 100vh;
    max-width: 1280px;
    margin: 0 auto;
}

/* ---------- Sidebar ---------- */

.sidebar {
    flex: 0 0 var(--sidebar-w);
    width: var(--sidebar-w);
    border-right: 1px solid var(--line);
    position: sticky;
    top: 0;
    align-self: flex-start;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-inner {
    padding: 3rem 2.25rem 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.portrait {
    width: 108px;
    height: 108px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--line-strong);
    box-shadow: 0 1px 0 rgba(30, 36, 48, 0.04);
}

.name {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.9rem;
    line-height: 1.15;
    margin: 1.1rem 0 0.15rem;
    color: var(--ink);
}

.name span {
    color: var(--seal);
}

.role {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--seal);
    margin: 0.1rem 0 0.3rem;
}

.focus {
    font-size: 0.9rem;
    color: var(--ink-soft);
    margin: 0 0 1.5rem;
}

.contact-list {
    width: 100%;
    margin-bottom: 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid var(--line);
}

.contact-list li {
    display: flex;
    flex-direction: column;
    font-size: 0.85rem;
}

.contact-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin-bottom: 0.15rem;
}

.contact-value {
    color: var(--ink-soft);
    display: inline-flex;
    align-items: center;
    word-break: break-word;
}

.at-icon {
    height: 0.85em;
    margin: 0 0.15em;
}

.social-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 0.9rem;
    padding-bottom: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--line);
    width: 100%;
}

.social-list a {
    font-size: 0.82rem;
    color: var(--slate);
}

.side-nav {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    width: 100%;
    margin-bottom: 2rem;
}

.side-nav-link {
    font-size: 0.88rem;
    color: var(--ink-soft);
    padding: 0.1rem 0;
    border-left: 2px solid transparent;
    padding-left: 0.7rem;
}

.side-nav-link:hover,
.side-nav-link:focus-visible {
    color: var(--ink);
    text-decoration: none;
    border-left-color: var(--line-strong);
}

.side-nav-link.active {
    color: var(--seal);
    border-left-color: var(--seal);
    font-weight: 600;
}

.journey {
    margin-top: auto;
    padding-top: 1.25rem;
    border-top: 1px solid var(--line);
    width: 100%;
}

.journey-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin-bottom: 0.7rem;
}

.journey-logos {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.9rem;
}

.journey-logos a {
    display: inline-block;
    line-height: 0;
    border-radius: 4px;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.journey-logos a:hover,
.journey-logos a:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(30, 36, 48, 0.12);
}

.journey-logos img {
    height: 40px;
    width: auto;
    max-width: 52px;
    object-fit: contain;
}

/* ---------- Mobile top bar ---------- */

.mobile-bar {
    display: none;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 100;
}

.mobile-bar-name {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.15rem;
}

.nav-toggle {
    background: none;
    border: 1px solid var(--line-strong);
    border-radius: 4px;
    width: 38px;
    height: 34px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--ink);
}

/* ---------- Main content ---------- */

main {
    flex: 1 1 auto;
    min-width: 0;
    padding: 3.5rem 3rem 4rem;
}

.section {
    max-width: var(--content-max);
    padding-bottom: 3rem;
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--line);
}

.section:last-of-type {
    border-bottom: none;
}

.section-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.5rem;
    margin: 0 0 1.75rem;
    color: var(--ink);
}

.eyebrow {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--seal);
    margin: 0 0 0.9rem;
}

.statement {
    font-size: 1.12rem;
    line-height: 1.75;
    color: var(--ink);
    margin: 0 0 1.5rem;
    max-width: 76ch;
    text-align: justify;
}

.keyword-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 0.7rem;
}

.keyword-row li {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--slate);
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    padding: 0.3rem 0.85rem;
    background: var(--paper-raised);
}

/* ---------- Timeline (signature element) ---------- */

.timeline {
    position: relative;
    padding-left: 4.4rem;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 2.55rem;
    top: 0.35rem;
    bottom: 0.35rem;
    width: 1px;
    background: var(--line-strong);
}

.entry {
    position: relative;
    padding-bottom: 2.2rem;
}

.entry:last-child {
    padding-bottom: 0;
}

.entry-mark {
    position: absolute;
    left: -4.4rem;
    top: 0.15rem;
    width: 4.4rem;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 1.55rem;
}

.entry-mark::after {
    content: "";
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--paper);
    border: 2px solid var(--seal);
    flex-shrink: 0;
}

.entry-year {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--ink-faint);
}

.entry-body {
    padding-left: 1.0rem;
}

.entry-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.08rem;
    margin: 0 0 0.25rem;
    color: var(--ink);
}

.entry-org {
    font-size: 0.92rem;
    color: var(--slate);
    margin: 0 0 0.5rem;
    font-weight: 600;
}

.entry-desc {
    font-size: 0.95rem;
    color: var(--ink-soft);
    margin: 0 0 0.6rem;
    max-width: 58ch;
}

.entry-date {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--ink-faint);
    letter-spacing: 0.02em;
}

/* ---------- Publications ---------- */

.scholar-link {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    margin-bottom: 1.5rem;
}

.pub-list {
    margin: 0;
    padding-left: 1.4rem;
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}

.pub-list li {
    font-size: 0.96rem;
    color: var(--ink-soft);
    line-height: 1.65;
}

.pub-list em {
    color: var(--ink);
    font-style: italic;
}

/* ---------- Skills ---------- */

.skill-group {
    margin-bottom: 1.75rem;
}

.skill-heading {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin: 0 0 0.75rem;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 0.6rem;
}

.tag-row li {
    font-size: 0.85rem;
    color: var(--ink);
    background: var(--paper-raised);
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 0.35rem 0.7rem;
}

.skill-group:nth-of-type(2) .tag-row li {
    /*border-color: var(--seal-soft);
    color: var(--seal);
    background: #fbf1f3;*/
}

.competitive-box {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.75rem;
    border-top: 1px solid var(--line);
}

.icpc-badge {
    height: 80px;
    width: auto;
    flex-shrink: 0;
}

.competitive-box p {
    font-size: 0.92rem;
    color: var(--ink-soft);
    margin: 0;
}

/* ---------- Interests ---------- */

.interests-caption {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin: 1.5rem 0 0.9rem;
}

.flag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.4rem;
}

.flag-row li {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    width: 64px;
}

.flag-row img {
    width: 36px;
    height: 36px;
    object-fit: cover;
    border-radius: 50%;
    border: 1px solid var(--line-strong);
}

.flag-row span {
    font-size: 0.68rem;
    color: var(--ink-faint);
    text-align: center;
    line-height: 1.2;
}

/* ---------- Footer ---------- */

.page-footer {
    max-width: var(--content-max);
    padding-top: 1rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--ink-faint);
}

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

@media (max-width: 960px) {
    .mobile-bar {
        display: flex;
    }

    .page {
        display: block;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        width: 280px;
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        background: var(--paper);
        z-index: 150;
        box-shadow: 2px 0 18px rgba(0, 0, 0, 0.12);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    main {
        padding: 2.5rem 1.4rem 3.5rem;
    }

    .section {
        max-width: 100%;
    }
}

@media (max-width: 560px) {
    .timeline {
        padding-left: 3.4rem;
    }

    .timeline::before {
        left: 1.6rem;
    }

    .entry-mark {
        left: -3.4rem;
        width: 3.4rem;
    }

    .entry-year {
        display: none;
    }

    .name {
        font-size: 1.6rem;
    }
}