/* ── Design tokens (soft base + navy accent) ── */
:root {
    --color-bg: #c8d0da;
    --color-surface: #dce2ea;
    --color-text: #1a2836;
    --color-text-secondary: #344656;
    --color-text-muted: #566878;
    --color-border: #a8b6c4;
    --color-border-light: #bcc9d6;
    --color-header-bg: #b8c8da;
    --color-header-text: #1a3050;
    --color-accent: #1a3358;
    --color-accent-hover: #122744;
    --color-accent-soft: #8fa8c4;
    --color-accent-light: #b4c8dc;
    --color-chrome-bg: #b8c6da;
    --color-chrome-bg-mid: #a4b4ca;
    --color-chrome-bg-end: #8ea3bc;
    --color-btn-start: #4a7eb8;
    --color-btn-end: #1a3358;
    --color-btn-hover-start: #5a8ec8;
    --color-btn-hover-end: #224470;
    --color-chrome-gradient: linear-gradient(180deg, var(--color-chrome-bg) 0%, var(--color-chrome-bg-mid) 50%, var(--color-chrome-bg-end) 100%);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --max-width: 1080px;
    --radius: 10px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 4px rgba(26, 51, 88, 0.12);
    --shadow-md: 0 4px 16px rgba(26, 51, 88, 0.16);
    --section-gap: 1.75rem;
}

/* ── Base ── */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 0.975rem;
    -webkit-font-smoothing: antialiased;
}

p {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

ul {
    color: var(--color-text-secondary);
    padding-left: 1.25rem;
}

ul li {
    margin-bottom: 0.5rem;
}

ul li::marker {
    color: var(--color-accent);
}

a {
    color: var(--color-accent);
    transition: color 0.15s ease;
}

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

/* ── Navigation ── */
.site-nav {
    background: var(--color-chrome-gradient);
    border-bottom: none;
    border-top: 3px solid var(--color-accent);
    padding: 0.65rem 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-nav .navbar-brand {
    font-weight: 800;
    font-size: 1.95rem;
    color: var(--color-accent);
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.site-nav .navbar-brand:hover {
    color: var(--color-accent-hover);
}

.site-nav .navbar-nav {
    gap: 0.75rem;
}

.site-nav .nav-link {
    color: var(--color-header-text);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    background: transparent;
    border: none;
    border-radius: 6px;
    transition: color 0.15s ease, background 0.15s ease;
}

.site-nav .nav-link:hover,
.site-nav .nav-link:focus {
    color: var(--color-accent);
    background: rgba(255, 255, 255, 0.35);
}

.site-nav .navbar-toggler {
    border-color: var(--color-accent-soft);
    background: rgba(255, 255, 255, 0.25);
    padding: 0.35rem 0.6rem;
}

.site-nav .navbar-toggler-icon {
    filter: none;
    opacity: 0.7;
}

.site-nav .navbar-collapse {
    background: transparent;
}

/* ── Page layout ── */
#maindiv,
.page-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--section-gap) 1.5rem 3rem;
}

/* ── Section cards ── */
.page-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 0 2rem 2rem;
    margin-bottom: var(--section-gap);
    overflow: hidden;
}

.page-section:last-child {
    margin-bottom: 0;
}

.page-section:not(:has(> h4.text-bg-secondary)) {
    padding-top: 1.75rem;
}

/* ── Primary section headings (About, Projects, Skills) ── */
.page-section > h4.text-bg-secondary,
.page-section > h4.section-title,
h4.text-bg-secondary {
    background: var(--color-header-bg) !important;
    color: var(--color-header-text) !important;
    font-weight: 700;
    font-size: 1.5rem;
    text-transform: none;
    letter-spacing: -0.02em;
    padding: 0.85rem 2rem !important;
    margin: 0 -2rem 1.75rem -2rem !important;
    border-bottom: 1px solid var(--color-accent-soft);
    border-left: 4px solid var(--color-accent);
    border-radius: 0;
}

.page-section > p:first-of-type,
.page-section > h4.text-bg-secondary + p {
    font-size: 1.025rem;
    line-height: 1.75;
    color: var(--color-text-secondary);
}

/* ── Experience subsections ── */
.current-responsibility > h5 u {
    text-decoration: none !important;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-header-text);
    display: block;
    margin-top: 1.75rem;
    margin-bottom: 0.875rem;
    padding: 0.65rem 1rem;
    background: var(--color-accent-light);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 6px 6px 0;
}

.current-responsibility > p + h5 u {
    margin-top: 2rem;
}

.current-responsibility > h5:first-child u {
    margin-top: 0;
}

/* ── Project category headings (ML Projects, NLP…) ── */
.project-div > h5 u {
    text-decoration: none !important;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--color-header-text);
    display: block;
    margin-top: 0;
    margin-bottom: 1.25rem;
    padding: 0;
    background: transparent;
    border: none;
    letter-spacing: -0.01em;
}

.project-div > h5:not(:first-child) u {
    margin-top: 2rem;
}

.project-div > h4.text-bg-secondary + h5 u {
    margin-top: 0;
}

.project-div > h5 + .project-block {
    margin-bottom: 0.5rem;
}

/* ── Generic h5 u fallback (certification, etc.) ── */
.page-section:not(.current-responsibility):not(.project-div) > h5 u,
.certificate > h5 u,
.Scholarships > h5 u {
    text-decoration: none !important;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-header-text);
    display: block;
    margin-top: 0;
    margin-bottom: 1.25rem;
    padding: 0.65rem 1rem;
    background: var(--color-accent-light);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 6px 6px 0;
}

/* ── Project grid ── */
.project {
    padding-bottom: 0;
}

.project-block {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
    padding-top: 0.25rem;
}

.project-box {
    padding: 0;
}

.project-box .card {
    width: 100% !important;
    background: #e8edf3;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: none;
    transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    height: 100%;
    overflow: hidden;
}

.project-box .card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.project-box .card-img-top {
    height: 160px;
    object-fit: cover;
    border-bottom: 1px solid var(--color-border-light);
    background: var(--color-border-light);
}

.project-box .card-body {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    flex: 1;
    background: #e8edf3;
}

.project-box .card-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.card-text {
    height: auto !important;
    min-height: 72px;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    flex: 1;
}

/* ── Buttons ── */
.btn-primary {
    background: linear-gradient(180deg, var(--color-btn-start) 0%, var(--color-btn-end) 100%) !important;
    border: none !important;
    color: #ffffff !important;
    font-size: 0.82rem;
    font-weight: 600;
    padding: 0.45rem 1.1rem;
    border-radius: 6px;
    align-self: flex-start;
    margin-top: auto;
    box-shadow: 0 2px 6px rgba(26, 51, 88, 0.22);
    transition: background 0.2s ease, box-shadow 0.15s ease;
}

.btn-primary:hover,
.btn-primary:focus {
    background: linear-gradient(180deg, var(--color-btn-hover-start) 0%, var(--color-btn-hover-end) 100%) !important;
    border: none !important;
    color: #ffffff !important;
    box-shadow: 0 3px 10px rgba(26, 51, 88, 0.3);
}

/* ── Skills ── */
.keyskill {
    padding-top: 0;
    margin-top: 0;
    border-top: none;
}

.keyskill h6 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-header-text);
    margin-bottom: 0.75rem;
    margin-top: 1.75rem;
    letter-spacing: -0.01em;
}

.keyskill h6:first-of-type {
    margin-top: 0;
}

.badge.text-bg-dark {
    background-color: var(--color-accent-light) !important;
    color: var(--color-header-text) !important;
    font-weight: 500;
    font-size: 0.78rem;
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    border: 1px solid var(--color-accent-soft);
    margin: 0.15rem 0.25rem 0.15rem 0;
}

/* ── Project detail pages ── */
#projectimg {
    max-width: 900px;
    margin: var(--section-gap) auto 3rem;
    padding: 0 1.5rem 2rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

#projectimg h3 {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.45;
    padding: 1.15rem 1.75rem !important;
    padding-top: 1.15rem !important;
    margin: 0 -1.5rem 1.5rem -1.5rem;
    color: var(--color-header-text);
    background: var(--color-header-bg);
    border-bottom: 1px solid var(--color-accent-soft);
    border-left: 4px solid var(--color-accent);
}

#projectimg h4 {
    padding-left: 0 !important;
    padding-top: 0 !important;
}

#projectimg h5 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-header-text);
    padding: 0 !important;
    margin-top: 1.75rem;
    margin-bottom: 1rem;
    background: transparent;
    border: none;
}

#projectimg h3 + h5 {
    margin-top: 0;
}

#projectimg h5 u {
    text-decoration: none !important;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-header-text);
    display: block;
    padding: 0.65rem 1rem;
    background: var(--color-accent-light);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 6px 6px 0;
}

#projectimg ul {
    margin-top: 0;
    margin-bottom: 0;
}

#projectimg img {
    padding-left: 0 !important;
    max-width: 100%;
    height: auto;
    display: block;
    margin-top: 0;
    margin-bottom: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

/* ── Contact page ── */
.contact-card {
    max-width: 440px;
    margin: var(--section-gap) auto 3rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.contact-card .card-body {
    padding: 0 2rem 2rem;
}

.contact-card hr {
    border-color: var(--color-border);
    opacity: 1;
    margin: 1.25rem 0;
}

.contact-card .card-text {
    color: var(--color-text-secondary);
    font-size: 0.925rem;
    margin-bottom: 0.5rem;
}

.contact-card a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    margin-right: 1.5rem;
}

.contact-card a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* ── Certification page ── */
.certificate img {
    padding: 0.5rem 0.5rem 0.5rem 0 !important;
    max-width: 100%;
    height: auto !important;
    width: auto !important;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    margin-bottom: 0.75rem;
}

.page-section > h4.text-bg-secondary + .list-group {
    margin-top: 0;
}

.page-section > h4.text-bg-secondary:has(+ .list-group) {
    border-bottom: none;
    margin-bottom: 1.25rem !important;
}

.Scholarships .list-group {
    border: none;
    border-radius: 0;
    overflow: visible;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.Scholarships .list-group-item,
.list-group-item-primary,
.list-group-item-secondary {
    background-color: var(--color-surface) !important;
    color: var(--color-text-secondary) !important;
    border: 1px solid var(--color-border) !important;
    border-radius: var(--radius) !important;
    font-size: 0.925rem;
    padding: 0.875rem 1.25rem;
    margin: 0;
}

.Scholarships .list-group-item-primary,
.list-group-item-primary {
    background-color: var(--color-accent-light) !important;
}

/* ── Resume page ── */
.resume-embed {
    display: block;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    height: 90vh;
    min-height: 600px;
    border: none;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
}

/* ── Footer ── */
.site-footer {
    border-top: none;
    border-bottom: 3px solid var(--color-accent);
    padding: 0.65rem 1rem;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.78rem;
    background: var(--color-chrome-gradient);
    box-shadow: 0 -2px 10px rgba(26, 51, 88, 0.1);
}

.footer-social {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 0.35rem;
}

.footer-social a {
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    flex-shrink: 0;
    transition: color 0.15s ease, transform 0.15s ease;
}

.footer-social svg {
    width: 18px;
    height: 18px;
}

.footer-icon-gap {
    display: block;
    width: 1cm;
    min-width: 1cm;
    height: 18px;
    flex-shrink: 0;
}

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

.footer-copy {
    margin: 0;
}

.end {
    display: none;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    #maindiv,
    .page-content,
    #projectimg {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .page-section {
        padding: 0 1.25rem 1.5rem;
    }

    .page-section > h4.text-bg-secondary,
    h4.text-bg-secondary {
        margin-left: -1.25rem !important;
        margin-right: -1.25rem !important;
        padding-left: 1.25rem !important;
        padding-right: 1.25rem !important;
    }

    #projectimg h3 {
        margin-left: -1rem;
        margin-right: -1rem;
        padding-left: 1.25rem;
        padding-right: 1.25rem;
        font-size: 1.05rem;
    }

    .contact-card .card-body {
        padding: 0 1.25rem 1.5rem;
    }

    .contact-card h4.text-bg-secondary {
        margin-left: -1.25rem !important;
        margin-right: -1.25rem !important;
        padding-left: 1.25rem !important;
        padding-right: 1.25rem !important;
    }

    .project-block {
        grid-template-columns: 1fr;
    }

    .certificate img {
        display: block;
    }
}