/* Embedded - Static profile site */
/* Light engineering-oriented theme */

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f4f7fb;
    --bg-card: #ffffff;
    --text-primary: #142235;
    --text-secondary: #455468;
    --text-muted: #64748b;
    --accent-primary: #0f4c81;
    --accent-secondary: #1f6aa8;
    --accent-tertiary: #0b3559;
    --accent-warm: #d97706;
    --border-color: #d8e0ea;
    --border-light: #e7edf4;
    --success: #1f8a4c;
    --font-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;
    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-serif: "Crimson Pro", "Georgia", serif;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 20px rgba(17, 34, 58, 0.08);
    --shadow-lg: 0 16px 32px rgba(17, 34, 58, 0.12);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    background: rgba(255, 255, 255, 0.96);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-warm));
    border-radius: 10px;
    color: white;
    font-weight: 700;
}

.brand-text {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.nav-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.nav-links {
    display: flex;
    gap: 1.6rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.93rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--accent-primary);
}

.language-switcher {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.2rem 0;
}

.lang-button {
    appearance: none;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.84rem;
    font-weight: 600;
    line-height: 1;
    padding: 0.2rem 0.1rem;
    transition: color 0.2s;
}

.lang-button:hover {
    color: var(--accent-primary);
}

.lang-button.is-active {
    color: var(--text-primary);
}

.lang-separator {
    color: var(--border-color);
    font-size: 0.78rem;
    line-height: 1;
}

.hero {
    padding: 8rem 5% 4rem;
    text-align: center;
    background:
        radial-gradient(circle at top left, rgba(15, 76, 129, 0.08), transparent 30%),
        radial-gradient(circle at top right, rgba(217, 119, 6, 0.08), transparent 28%),
        var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    max-width: 920px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(1.95rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.12rem;
    color: var(--text-secondary);
    max-width: 760px;
    margin: 0 auto 1.75rem;
    font-family: var(--font-serif);
}

.research-label {
    display: inline-block;
    background: rgba(15, 76, 129, 0.08);
    color: var(--accent-primary);
    padding: 0.3rem 0.85rem;
    border-radius: 999px;
    font-size: 0.74rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
}

.hero-stat .stat-value {
    display: block;
    font-size: 2.3rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--accent-primary);
    line-height: 1;
}

.hero-stat .stat-desc {
    display: block;
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

.hero-badges {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.hero-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 2rem;
}

.hero-actions .btn {
    min-width: 220px;
}

.badge {
    padding: 0.45rem 0.95rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    font-size: 0.78rem;
    font-family: var(--font-mono);
    color: var(--accent-primary);
}

.challenge-section {
    padding: 3rem 5%;
    background: var(--bg-secondary);
}

.challenge-section h2,
.expertise-section h2,
.experience-section h2,
.about-section h2,
.cta-section h2 {
    text-align: center;
    font-size: 1.6rem;
    color: var(--accent-primary);
    margin-bottom: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.challenge-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.challenge-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.challenge-card h3 {
    font-size: 1.12rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.challenge-card ul {
    list-style: none;
    margin-bottom: 1rem;
}

.challenge-card li {
    padding: 0.42rem 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.challenge-gap,
.challenge-novel {
    padding: 0.6rem 0.8rem;
    border-radius: 8px;
    font-size: 0.84rem;
    font-weight: 600;
    text-align: center;
}

.challenge-gap {
    background: rgba(217, 119, 6, 0.12);
    color: #9a5a05;
}

.challenge-novel {
    background: rgba(31, 138, 76, 0.12);
    color: var(--success);
}

.challenge-card.embedded {
    border-color: rgba(15, 76, 129, 0.35);
    box-shadow: 0 0 0 1px rgba(15, 76, 129, 0.16);
}

.section-summary {
    max-width: 760px;
    margin: 0 auto 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-family: var(--font-serif);
    font-size: 1rem;
}

.expertise-section {
    padding: 4rem 5%;
}

.expertise-section {
    background:
        linear-gradient(180deg, rgba(15, 76, 129, 0.03), rgba(15, 76, 129, 0)),
        var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.expertise-grid {
    max-width: 1040px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
}

.expertise-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 1.6rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, border-color 0.2s, transform 0.2s;
}

.expertise-card:hover,
.experience-card:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(15, 76, 129, 0.35);
    transform: translateY(-2px);
}

.expertise-card h3 {
    font-size: 1.08rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.skill-list,
.experience-list {
    list-style: none;
}

.skill-list li,
.experience-list li {
    color: var(--text-secondary);
    padding: 0.45rem 0 0.45rem 1.2rem;
    position: relative;
    font-size: 0.95rem;
}

.skill-list li::before,
.experience-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.96rem;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-warm);
}

.experience-section {
    padding: 4rem 5%;
    background: var(--bg-primary);
}

.experience-grid {
    max-width: 1040px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
}

.experience-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 1.6rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, border-color 0.2s, transform 0.2s;
}

.experience-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 0.9rem;
}

.experience-period {
    color: var(--text-muted);
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.experience-domain {
    background: rgba(15, 76, 129, 0.08);
    color: var(--accent-primary);
    border: 1px solid rgba(15, 76, 129, 0.14);
    border-radius: 999px;
    padding: 0.28rem 0.7rem;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.experience-card h3 {
    font-size: 1.16rem;
    margin-bottom: 0.45rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.experience-company {
    color: var(--text-secondary);
    font-family: var(--font-serif);
    margin-bottom: 1rem;
}

.cta-section p,
.about-text p {
    color: var(--text-secondary);
    font-family: var(--font-serif);
    font-size: 1rem;
}

.paper-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-bottom: 1.2rem;
}

.tech-tag {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    padding: 0.24rem 0.62rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
}

.paper-links {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.72rem 1.2rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    font-size: 0.92rem;
}

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

.btn-primary:hover {
    background: var(--accent-tertiary);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

.about-section {
    padding: 4rem 5%;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.snowden-quote {
    display: block;
    max-width: 760px;
    margin: 0 auto 2.5rem auto;
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, rgba(15, 76, 129, 0.06), rgba(217, 119, 6, 0.04));
    border-left: 4px solid var(--accent-primary);
    border-radius: 0 10px 10px 0;
    text-align: center;
}

.snowden-quote p {
    font-family: var(--font-serif);
    font-size: 1.14rem;
    font-style: italic;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.snowden-quote cite {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-style: normal;
    color: var(--text-muted);
    font-weight: 600;
}

.about-content {
    max-width: 1040px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 2.4rem;
}

.about-text p {
    margin-bottom: 1.25rem;
}

.about-text h3 {
    font-size: 1.12rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.about-text ul {
    list-style: none;
}

.about-text li {
    color: var(--text-secondary);
    padding: 0.45rem 0;
    padding-left: 1.25rem;
    position: relative;
    font-size: 0.95rem;
}

.about-text li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--accent-warm);
    border-radius: 50%;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.3rem;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--accent-primary);
    line-height: 1;
    margin-bottom: 0.35rem;
}

.stat-label {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.cta-section {
    padding: 4rem 5%;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-section p {
    margin-bottom: 1.5rem;
}

.cta-section .paper-links {
    justify-content: center;
}

.site-footer {
    background: #192431;
    color: white;
    padding: 3rem 5% 1.5rem;
}

.footer-container {
    max-width: 1040px;
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 2rem;
}

.footer-section {
    display: flex;
    flex-direction: column;
}

.footer-title {
    font-size: 1.45rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: white;
}

.footer-tagline {
    color: #f3f4f6;
    font-size: 0.94rem;
    font-weight: 600;
    margin-bottom: 0.55rem;
}

.footer-description {
    color: #b6c3d1;
    font-size: 0.92rem;
    line-height: 1.6;
}

.footer-heading {
    font-size: 0.95rem;
    font-weight: 700;
    color: #f3f4f6;
    margin-bottom: 0.75rem;
}

.footer-subheading {
    margin-top: 1rem;
}

.footer-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-nav li {
    margin-bottom: 0.5rem;
}

.footer-nav a,
.footer-legal-links a {
    color: #b6c3d1;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.footer-nav a:hover,
.footer-legal-links a:hover {
    color: white;
}

.footer-divider {
    height: 1px;
    background: #2f4154;
    margin: 2rem 0 1.5rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-copyright {
    color: #93a5b7;
    font-size: 0.85rem;
    margin: 0;
}

.footer-legal-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

pre,
code {
    font-family: var(--font-mono);
    background: var(--bg-secondary);
    border-radius: 4px;
}

code {
    padding: 0.15rem 0.35rem;
    font-size: 0.85rem;
    color: var(--accent-tertiary);
}

pre {
    padding: 1rem;
    overflow-x: auto;
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
}

@media (max-width: 900px) {
    .navbar {
        gap: 1rem;
    }

    .nav-actions {
        width: 100%;
        justify-content: space-between;
    }

    .nav-links {
        gap: 1rem;
    }

    .expertise-grid,
    .experience-grid,
    .about-content {
        grid-template-columns: 1fr;
    }

    .about-stats {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }

    .stat-card {
        flex: 1;
        min-width: 160px;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 0.8rem 5%;
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-actions {
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.8rem;
    }

    .nav-links {
        gap: 0.85rem;
        font-size: 0.9rem;
        justify-content: flex-start;
    }

    .language-switcher {
        padding-top: 0.2rem;
    }

    .hero {
        padding: 9rem 5% 3rem;
    }

    .hero-stats {
        gap: 1.4rem;
    }

    .hero-stat .stat-value {
        font-size: 1.8rem;
    }

    .challenge-grid,
    .expertise-grid,
    .experience-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        align-items: stretch;
    }

    .paper-links,
    .footer-legal-links {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}