/* =========================================================
   Section-level styling for the single-page portfolio.
   Depth metaphor: hero (sky) -> about (foam) -> waves ->
   education/achievements/experience/projects (gradient blue) ->
   skills (deep) -> contact (abyss with seabed image).
   ========================================================= */

/* ---- Shared button system ------------------------------- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.8rem 1.25rem;
    border-radius: 999px;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background var(--dur) var(--ease),
                color var(--dur) var(--ease),
                border-color var(--dur) var(--ease),
                transform var(--dur) var(--ease);
}

.btn svg {
    width: 1em;
    height: 1em;
}

.btn-primary {
    background: var(--ink);
    color: var(--sky);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background: var(--wave-darker);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--border-soft);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
    border-color: var(--wave-darker);
    color: var(--wave-darker);
    transform: translateY(-1px);
}

.btn-on-dark {
    background: var(--accent);
    color: var(--abyss);
}

.btn-on-dark:hover,
.btn-on-dark:focus-visible {
    background: var(--on-dark);
    transform: translateY(-1px);
}

.btn-ghost-on-dark {
    background: transparent;
    color: var(--on-dark);
    border-color: var(--border-on-dark);
}

.btn-ghost-on-dark:hover,
.btn-ghost-on-dark:focus-visible {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

/* =========================================================
   01 — Hero
   ========================================================= */

.hero {
    position: relative;
    background: var(--sky);
    padding: clamp(5rem, 12vw, 9rem) 0 clamp(4rem, 8vw, 6rem);
    overflow: hidden;
}

.hero-inner {
    max-width: var(--content-max);
    margin-inline: auto;
    padding-inline: var(--gutter);
    display: grid;
    gap: 1.5rem;
    position: relative;
    z-index: 2;
}

.hero-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    align-self: start;
    padding: 0.4rem 0.85rem;
    border-radius: 999px;
    background: rgba(0, 153, 255, 0.08);
    color: var(--wave-darker);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.hero-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--wave);
    box-shadow: 0 0 0 3px rgba(0, 153, 255, 0.22);
}

.hero-title {
    font-family: var(--font-mono);
    font-size: var(--fs-hero);
    font-weight: 700;
    line-height: 1.02;
    letter-spacing: -0.02em;
    color: var(--ink);
    margin: 0;
    cursor: default;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 1.8vw, 1.35rem);
    line-height: 1.5;
    max-width: 52ch;
    color: var(--ink-muted);
    margin: 0;
}

.hero-subtitle .emph {
    color: var(--ink);
    font-weight: 500;
}

.hero-meta {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    color: var(--ink-muted);
}

.hero-meta-sep {
    width: 28px;
    height: 1px;
    background: currentColor;
    opacity: 0.4;
}

.hero-ctas {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

/* =========================================================
   Wave transition (between hero and underwater sections)
   ========================================================= */

.wave-transition {
    position: relative;
    z-index: 3;
    margin-top: -1px;
    background: var(--sky);
}

/* =========================================================
   Underwater wrapper — all sections between hero and footer
   share a gradient background and a shared bubble/fish layer.
   ========================================================= */

.underwater {
    position: relative;
    background: linear-gradient(
        180deg,
        var(--wave) 0%,
        var(--wave-darker) 45%,
        var(--wave-darkest) 85%,
        var(--abyss) 100%
    );
    color: var(--on-dark);
    overflow: hidden;
}

.underwater .section-inner {
    position: relative;
    max-width: var(--content-max);
    margin-inline: auto;
    padding-inline: var(--gutter);
}

.underwater .eyebrow {
    color: var(--accent);
}

.underwater .section-heading {
    color: var(--on-dark);
}

.underwater .section-lead {
    color: var(--on-dark-muted);
}

/* =========================================================
   02 — About
   ========================================================= */

.section-about .about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(1.5rem, 4vw, 3rem);
}

.section-about .about-grid p {
    font-size: 1.05rem;
    line-height: 1.7;
    margin: 0;
}

.section-about .pull {
    grid-column: 1 / -1;
    margin: 1rem 0 0;
    padding: 1.5rem 1.75rem;
    border-left: 3px solid var(--accent);
    background: rgba(127, 211, 255, 0.06);
    font-family: 'Georgia', 'Times New Roman', serif;
    font-style: italic;
    font-size: 1.1rem;
    color: var(--on-dark);
}

@media (max-width: 780px) {
    .section-about .about-grid {
        grid-template-columns: 1fr;
    }
}

/* =========================================================
   03 — Education
   ========================================================= */

.education-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.edu-card {
    padding: 2rem;
    border-radius: var(--radius-md);
    background: rgba(234, 243, 255, 0.04);
    border: 1px solid var(--border-on-dark);
    transition: transform var(--dur) var(--ease),
                border-color var(--dur) var(--ease),
                background var(--dur) var(--ease);
}

.edu-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
    background: rgba(127, 211, 255, 0.05);
}

.edu-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.edu-dates {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    color: var(--accent);
    white-space: nowrap;
}

.edu-institution {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--on-dark);
    margin: 0 0 0.35rem;
    line-height: 1.25;
}

.edu-degree {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    color: var(--on-dark-muted);
    margin: 0 0 0.25rem;
}

.edu-location {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--on-dark-muted);
    opacity: 0.8;
    margin: 0 0 1rem;
}

.edu-body {
    font-size: 0.98rem;
    line-height: 1.6;
    color: var(--on-dark-muted);
    margin: 0 0 1rem;
}

.edu-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.65rem;
    border-radius: 999px;
    background: rgba(127, 211, 255, 0.1);
    border: 1px solid rgba(127, 211, 255, 0.25);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--accent);
}

@media (max-width: 780px) {
    .education-grid {
        grid-template-columns: 1fr;
    }

    .edu-head {
        flex-direction: column;
        gap: 0.5rem;
    }
}

/* =========================================================
   04 — Achievements (medal shelf)
   ========================================================= */

.medal-shelf {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
}

.medal-card {
    position: relative;
    padding: 1.5rem 1.5rem 1.25rem;
    border-radius: var(--radius-md);
    background: rgba(234, 243, 255, 0.04);
    border: 1px solid var(--border-on-dark);
    overflow: hidden;
    transition: transform var(--dur) var(--ease),
                border-color var(--dur) var(--ease);
}

.medal-card:hover {
    transform: translateY(-3px);
}

.medal-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--medal-color, var(--accent));
    opacity: 0.85;
}

.medal-card.tier-gold   { --medal-color: var(--gold); }
.medal-card.tier-silver { --medal-color: var(--silver); }
.medal-card.tier-bronze { --medal-color: var(--bronze); }
.medal-card.tier-mixed  { --medal-color: var(--accent); }

.medal-card:hover { border-color: var(--medal-color, var(--accent)); }

.medal-name {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--on-dark);
    margin: 0 0 0.3rem;
    line-height: 1.3;
}

.medal-subname {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: var(--on-dark-muted);
    margin: 0 0 1rem;
    text-transform: uppercase;
}

.medal-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.45rem;
}

.medal-item {
    display: grid;
    grid-template-columns: 18px 70px 1fr;
    align-items: center;
    gap: 0.7rem;
    font-size: 0.9rem;
    color: var(--on-dark);
}

.medal-disc {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--disc-color, var(--accent));
    box-shadow: inset 0 -3px 4px rgba(0, 0, 0, 0.2),
                inset 0 2px 3px rgba(255, 255, 255, 0.25);
}

.medal-disc.disc-gold   { --disc-color: var(--gold); }
.medal-disc.disc-silver { --disc-color: var(--silver); }
.medal-disc.disc-bronze { --disc-color: var(--bronze); }
.medal-disc.disc-trophy { --disc-color: var(--accent); }

.medal-tier {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: var(--on-dark);
    text-transform: uppercase;
}

.medal-year {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--on-dark-muted);
    text-align: right;
}

/* =========================================================
   05 — Experience (vertical timeline)
   ========================================================= */

.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background: linear-gradient(
        180deg,
        rgba(127, 211, 255, 0.7),
        rgba(127, 211, 255, 0.05)
    );
}

.timeline-entry {
    position: relative;
    padding-bottom: 2.5rem;
}

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

.timeline-entry::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px rgba(127, 211, 255, 0.15),
                0 0 0 8px rgba(127, 211, 255, 0.06);
}

.timeline-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    margin-bottom: 0.4rem;
}

.timeline-role {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--on-dark);
    margin: 0;
    line-height: 1.3;
}

.timeline-org {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    color: var(--accent);
    margin: 0 0 0.2rem;
}

.timeline-meta {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--on-dark-muted);
    white-space: nowrap;
}

.timeline-location {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--on-dark-muted);
    margin: 0 0 0.9rem;
    opacity: 0.85;
}

.timeline-bullets {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.55rem;
}

.timeline-bullets li {
    position: relative;
    padding-left: 1.1rem;
    font-size: 0.98rem;
    line-height: 1.55;
    color: var(--on-dark-muted);
}

.timeline-bullets li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.65em;
    width: 6px;
    height: 1px;
    background: var(--accent);
}

/* =========================================================
   06 — Projects (keeps circle-reveal hover; new chip row)
   ========================================================= */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 1000px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

.project-card {
    position: relative;
    display: flex;
    flex-direction: column;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: rgba(234, 243, 255, 0.04);
    border: 1px solid var(--border-on-dark);
    transition: transform var(--dur) var(--ease),
                border-color var(--dur) var(--ease);
    min-height: 280px;
}

.project-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
}

.project-media {
    position: relative;
    height: 160px;
    background: linear-gradient(135deg, var(--wave-darker), var(--wave-darkest));
    background-size: cover;
    background-position: center;
    overflow: hidden;
}

.project-media::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(1, 26, 51, 0.7));
    pointer-events: none;
}

.project-media-label {
    position: absolute;
    left: 1rem;
    bottom: 0.9rem;
    z-index: 2;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--on-dark-muted);
}

.project-body {
    padding: 1.35rem 1.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    flex: 1;
}

.project-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--on-dark);
    margin: 0;
    line-height: 1.3;
}

.project-desc {
    font-size: 0.96rem;
    line-height: 1.55;
    color: var(--on-dark-muted);
    margin: 0;
    flex: 1;
}

.project-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    background: rgba(127, 211, 255, 0.08);
    border: 1px solid rgba(127, 211, 255, 0.2);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.03em;
    color: var(--on-dark);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 0.3rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    color: var(--accent);
    text-transform: uppercase;
}

.project-link::after {
    content: '>';
    transition: transform var(--dur) var(--ease);
}

.project-link:hover::after,
.project-link:focus-visible::after {
    transform: translateX(3px);
}

.project-link.is-disabled {
    color: var(--on-dark-muted);
    opacity: 0.55;
    cursor: not-allowed;
    pointer-events: none;
}

/* =========================================================
   07 — Skills
   ========================================================= */

.skills-rows {
    display: grid;
    gap: 1rem;
}

.skills-row {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 1.5rem;
    align-items: baseline;
    padding: 1rem 0;
    border-top: 1px solid var(--border-on-dark);
}

.skills-row:last-child {
    border-bottom: 1px solid var(--border-on-dark);
}

.skills-label {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
}

.skills-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

@media (max-width: 780px) {
    .skills-row {
        grid-template-columns: 1fr;
        gap: 0.6rem;
    }
}

/* =========================================================
   08 — Contact / Footer (seabed)
   ========================================================= */

.site-footer {
    position: relative;
    background: var(--abyss);
    color: var(--on-dark);
    padding: clamp(4rem, 8vw, 6rem) 0 3rem;
    overflow: hidden;
}

.site-footer::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url('../images/bottom_of_sea_2.png');
    background-repeat: no-repeat;
    background-position: bottom center;
    /* 100% auto keeps the natural aspect ratio of the 1008x172 image
       and makes it span the full viewport width without being blown up. */
    background-size: 100% auto;
    opacity: 0.6;
    pointer-events: none;
}

.footer-inner {
    position: relative;
    z-index: 2;
    max-width: var(--content-max);
    margin-inline: auto;
    padding-inline: var(--gutter);
}

.footer-cta {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: end;
    gap: 2rem;
    margin-bottom: 3rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--border-on-dark);
}

.footer-cta-heading {
    font-size: clamp(1.6rem, 3vw, 2.25rem);
    font-weight: 700;
    line-height: 1.2;
    margin: 0 0 0.5rem;
    color: var(--on-dark);
}

.footer-cta-sub {
    font-size: 1rem;
    color: var(--on-dark-muted);
    margin: 0;
    max-width: 50ch;
}

.footer-cta-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.footer-col-title {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 0.85rem;
}

.footer-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 0.5rem;
}

.footer-col a,
.footer-col-text {
    font-size: 0.95rem;
    color: var(--on-dark-muted);
    transition: color var(--dur) var(--ease);
    word-break: break-word;
}

.footer-col a:hover,
.footer-col a:focus-visible {
    color: var(--accent);
}

.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: var(--on-dark-muted);
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-on-dark);
}

.footer-bottom a {
    color: var(--on-dark-muted);
}

.footer-bottom a:hover,
.footer-bottom a:focus-visible {
    color: var(--accent);
}

@media (max-width: 780px) {
    .footer-cta {
        grid-template-columns: 1fr;
        align-items: start;
    }
}