:root {
    --bg: #0A2540;
    --bg-alt: #0E2F4E;
    --bg-card: #0F3457;
    --ink: #EAF2FA;
    --muted: #9FB7CE;
    --line: rgba(234, 242, 250, 0.14);
    --line-soft: rgba(234, 242, 250, 0.07);
    --accent: #F2A65A;
    --accent-ink: #1A1002;
    --cyan: #5FD6CB;
    --paper: #F4F7FA;
    --font-display: 'IBM Plex Mono', monospace;
    --font-body: 'IBM Plex Sans', sans-serif;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    line-height: 1.65;
    overflow-x: hidden;
    position: relative;
}

#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.bp-grid {
    background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
    background-size: 44px 44px;
}

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

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

::selection {
    background: var(--accent);
    color: var(--accent-ink);
}

.eyebrow {
    font-family: var(--font-display);
    font-size: .72rem;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: .6rem;
    margin-bottom: 1rem;
}

.eyebrow::before {
    content: "";
    width: 22px;
    height: 1px;
    background: var(--accent);
    display: inline-block;
}

h1,
h2,
h3,
.font-display {
    font-family: var(--font-display);
}

h2.section-title {
    font-size: clamp(1.5rem, 3vw, 2.1rem);
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 2.2rem;
}

.frame {
    position: relative;
    border: 1px solid var(--line);
    padding: 2.4rem;
}

.frame::before,
.frame::after,
.frame .corner-tl,
.frame .corner-br {
    content: "";
    position: absolute;
    width: 14px;
    height: 14px;
    border-color: var(--accent);
}

.frame::before {
    top: -1px;
    left: -1px;
    border-top: 2px solid var(--accent);
    border-left: 2px solid var(--accent);
}

.frame::after {
    bottom: -1px;
    right: -1px;
    border-bottom: 2px solid var(--accent);
    border-right: 2px solid var(--accent);
}

.navbar {
    background: rgba(10, 37, 64, .92);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--line);
}

.navbar-brand {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: .04em;
    color: var(--ink) !important;
}

.navbar-brand span {
    color: var(--accent);
}

.nav-link {
    font-family: var(--font-display);
    font-size: .82rem;
    letter-spacing: .05em;
    color: var(--muted) !important;
    margin: 0 .35rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--ink) !important;
}

.lang-switch-container {
    border: 1px solid var(--line);
    border-radius: 4px;
    padding: 2px;
    background: rgba(14, 47, 78, 0.6);
}

.btn-lang {
    font-family: var(--font-display);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.2rem 0.65rem;
    color: var(--muted);
    border: none;
    background: transparent;
    border-radius: 3px;
    transition: all 0.2s ease;
}

.btn-lang:hover {
    color: var(--ink);
}

.btn-lang.active {
    background: var(--accent);
    color: var(--accent-ink);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
}

.hero {
    min-height: 90vh;
    min-height: 90svh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 85px;
    padding-bottom: 2.5rem;
    border-bottom: 1px dashed var(--line);
}

.hero-name {
    font-size: clamp(2.1rem, 6.5vw, 4.4rem);
    font-weight: 700;
    line-height: 1.05;
    margin: .4rem 0 1rem;
    word-break: break-word;
}

.hero-role {
    font-family: var(--font-display);
    color: var(--cyan);
    font-size: clamp(0.95rem, 1.8vw, 1.25rem);
    margin-bottom: 1.4rem;
    line-height: 1.4;
}

.hero-desc {
    color: var(--muted);
    font-size: 1.05rem;
    max-width: 520px;
}

.btn-bp {
    font-family: var(--font-display);
    font-size: .85rem;
    letter-spacing: .04em;
    padding: .75rem 1.5rem;
    border-radius: 2px;
    border: 1px solid var(--accent);
    color: var(--accent);
    background: transparent;
    transition: all .2s ease;
}

.btn-bp:hover {
    background: var(--accent);
    color: var(--accent-ink);
}

.btn-bp-solid {
    background: var(--accent);
    color: var(--accent-ink);
    border: 1px solid var(--accent);
}

.btn-bp-solid:hover {
    background: transparent;
    color: var(--accent);
}

#diagram {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

#diagram text {
    font-family: var(--font-display);
}

.diagram-line {
    stroke: var(--cyan);
    stroke-width: 1.4;
    fill: none;
    stroke-dasharray: 6 6;
    animation: dashmove 3.4s linear infinite;
    opacity: .75;
}

@keyframes dashmove {
    to {
    stroke-dashoffset: -120;
    }
}

.diagram-node {
    fill: var(--bg-card);
    stroke: var(--line);
    stroke-width: 1;
}

.diagram-node-core {
    fill: var(--accent);
    stroke: none;
}

section {
    padding: 6.5rem 0;
    position: relative;
    z-index: 1;
}

.section-alt {
    background: rgba(14, 47, 78, 0.75);
    backdrop-filter: blur(4px);
    border-top: 1px dashed var(--line);
    border-bottom: 1px dashed var(--line);
}

.skill-card {
    background: var(--bg-card);
    border: 1px solid var(--line);
    padding: 1.8rem;
    height: 100%;
    transition: border-color .2s ease, transform .2s ease;
    position: relative;
}

.skill-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    z-index: 10;
}

/* Elevate the entire column so tooltips aren't clipped by subsequent columns */
[data-reveal]:has(.skill-item:hover),
[data-reveal]:has(.skill-tooltip:hover),
[data-reveal]:has(.skill-tooltip.active) {
    z-index: 99999;
    position: relative;
}

.skill-card i {
    color: var(--accent);
    font-size: 1.4rem;
    margin-bottom: .9rem;
    display: block;
}

.skill-card h3 {
    font-size: 1rem;
    margin-bottom: .7rem;
    color: var(--ink);
}

.skill-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
    color: var(--muted);
    font-size: .92rem;
}

.skill-card li {
    padding: .35rem 0;
    border-top: 1px solid var(--line-soft);
}

.skill-card li:first-child {
    border-top: none;
}

.timeline-item {
    border-left: 1px solid var(--line);
    padding-left: 2rem;
    position: relative;
    padding-bottom: 2rem;
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: -6px;
    top: .35rem;
    width: 11px;
    height: 11px;
    background: var(--bg);
    border: 2px solid var(--accent);
    border-radius: 50%;
}

.timeline-date {
    font-family: var(--font-display);
    font-size: .78rem;
    color: var(--cyan);
    letter-spacing: .04em;
}

.timeline-role {
    font-size: 1.25rem;
    font-weight: 600;
    margin: .3rem 0 .1rem;
}

.timeline-company {
    color: var(--accent);
    font-family: var(--font-display);
    font-size: .9rem;
    margin-bottom: 1rem;
}

.timeline-item ul {
    color: var(--muted);
    padding-left: 1.2rem;
}

.timeline-item li {
    margin-bottom: .45rem;
}

.tag {
    display: inline-block;
    font-family: var(--font-display);
    font-size: .72rem;
    color: var(--muted);
    border: 1px solid var(--line);
    padding: .25rem .6rem;
    margin: .25rem .35rem .25rem 0;
}

.project-card {
    border: 1px solid var(--line);
    background: var(--bg-card);
}

.project-card .project-head {
    border-bottom: 1px dashed var(--line);
    padding: 1.8rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.project-card .project-body {
    padding: 1.8rem 2rem;
}

.project-card .project-date {
    color: var(--muted);
    font-family: var(--font-display);
    font-size: .8rem;
    margin-bottom: .4rem;
}

.project-card .project-title {
    font-size: 1.2rem;
    margin: 0;
}

.project-card .project-desc {
    color: var(--muted);
    margin-bottom: 1.2rem;
}

.project-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.6rem;
}

.project-links a {
    font-family: var(--font-display);
    font-size: .8rem;
    white-space: nowrap;
    padding: 0.35rem 0.75rem;
    background: rgba(95, 214, 203, 0.08);
    border: 1px solid rgba(95, 214, 203, 0.3);
    border-radius: 3px;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.project-links a:hover {
    background: rgba(242, 166, 90, 0.15);
    border-color: var(--accent);
    color: var(--accent);
}

.edu-item {
    border-bottom: 1px solid var(--line-soft);
    padding: 1.6rem 0;
}

.edu-item:last-child {
    border-bottom: none;
}

.edu-title {
    font-size: 1.1rem;
    font-weight: 600;
}

.edu-org {
    color: var(--accent);
    font-family: var(--font-display);
    font-size: .88rem;
}

.edu-date {
    color: var(--muted);
    font-family: var(--font-display);
    font-size: .8rem;
}

.contact-list {
    list-style: none;
    padding: 0;
    margin: 0 0 2rem;
}

.contact-list li {
    padding: .9rem 0;
    border-top: 1px solid var(--line-soft);
    font-family: var(--font-display);
    font-size: .92rem;
}

.contact-list li:first-child {
    border-top: none;
}

.contact-list a {
    color: var(--ink);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: .9rem;
    transition: color .2s ease, transform .2s ease;
}

.contact-list a:hover {
    color: var(--accent);
    transform: translateX(4px);
}

.contact-list i {
    color: var(--accent);
    width: 20px;
    text-align: center;
    transition: color .2s ease;
}

.contact-list a:hover i {
    color: var(--cyan);
}

.form-control {
    background: var(--bg-alt);
    border: 1px solid var(--line);
    color: var(--ink);
    border-radius: 2px;
    font-family: var(--font-body);
    font-size: 16px;
}

.form-control:focus {
    background: var(--bg-alt);
    color: var(--ink);
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(242, 166, 90, .18);
}

.form-control::placeholder {
    color: var(--muted);
}

label.form-label {
    font-family: var(--font-display);
    font-size: .78rem;
    letter-spacing: .05em;
    color: var(--muted);
    text-transform: uppercase;
}

footer {
    border-top: 1px dashed var(--line);
    padding: 2.4rem 0;
    color: var(--muted);
    font-family: var(--font-display);
    font-size: .82rem;
}

footer a {
    color: var(--muted);
    margin-left: 1.2rem;
    font-size: 1.05rem;
}

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

[data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .7s ease, transform .7s ease;
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top {
    position: fixed;
    right: 5.5rem;
    bottom: 1.6rem;
    width: 42px;
    height: 42px;
    border: 1px solid var(--accent);
    color: var(--accent);
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity .25s ease, visibility .25s ease, transform .2s ease;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent);
    color: var(--accent-ink);
    transform: translateY(-2px);
}

#toast-sent {
    position: fixed;
    top: 90px;
    right: 1.5rem;
    z-index: 2000;
}

/* --- Skill Tooltip & Backdrop --- */
.skill-item {
    position: relative;
    cursor: pointer;
    user-select: none;
    transition: color 0.2s ease;
}

.skill-item:hover .skill-name {
    color: var(--cyan);
}

.skill-tooltip {
    position: absolute;
    top: 50%;
    left: calc(100% + 15px);
    transform: translateY(-50%) translateX(-10px);
    width: 320px;
    background: rgba(10, 37, 64, 0.96);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--accent);
    border-radius: 6px;
    padding: 1.2rem;
    box-shadow: 0 10px 36px rgba(0, 0, 0, 0.45);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 99999;
    cursor: default;
}

/* Tooltip arrow for desktop */
.skill-tooltip::before {
    content: '';
    position: absolute;
    top: 50%;
    left: -7px;
    transform: translateY(-50%);
    border-width: 6px 6px 6px 0;
    border-style: solid;
    border-color: transparent var(--accent) transparent transparent;
}

.skill-tooltip::after {
    content: '';
    position: absolute;
    top: 50%;
    left: -5px;
    transform: translateY(-50%);
    border-width: 5px 5px 5px 0;
    border-style: solid;
    border-color: transparent rgba(10, 37, 64, 0.96) transparent transparent;
}

/* Hover activates tooltip only on devices with fine pointer (mouse/trackpad) */
@media (hover: hover) and (pointer: fine) {
    .skill-item:hover .skill-tooltip {
        opacity: 1;
        visibility: visible;
        transform: translateY(-50%) translateX(0);
    }
}

/* Active class activates tooltip on both touch and desktop clicks */
.skill-tooltip.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%) translateX(0);
}

.tooltip-close {
    position: absolute;
    top: 8px;
    right: 10px;
    background: transparent;
    border: 1px solid transparent;
    color: var(--muted);
    font-size: 1.3rem;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    line-height: 1;
    transition: all 0.2s ease;
}

.tooltip-close:hover {
    color: #ff6b6b;
    background: rgba(255, 107, 107, 0.15);
}

.tooltip-title {
    color: var(--accent);
    font-size: 1.05rem;
    margin-bottom: 0.8rem;
    padding-right: 1.8rem;
    font-weight: 600;
    font-family: var(--font-display);
}

.tooltip-desc {
    font-size: 0.88rem;
    line-height: 1.45;
    color: var(--ink);
    margin-bottom: 0.8rem;
}

.skill-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 99990;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

.skill-backdrop.active {
    opacity: 1;
    visibility: visible;
}

/* --- Media Queries (Tablet & Mobile) --- */
@media (max-width: 991px) {
    .navbar {
        padding-top: 0.65rem;
        padding-bottom: 0.65rem;
    }

    .navbar-collapse {
        background: rgba(10, 37, 64, 0.98);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        border: 1px solid var(--line);
        border-radius: 8px;
        margin-top: 0.75rem;
        padding: 1rem;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    }

    .navbar-nav .nav-link {
        padding: 0.75rem 0.5rem;
        font-size: 0.88rem;
        border-bottom: 1px solid var(--line-soft);
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .navbar-nav .nav-item:last-child .nav-link {
        border-bottom: none;
    }

    .lang-switch-container {
        margin-top: 0.6rem;
        width: 100%;
        display: flex !important;
        justify-content: center;
    }

    .btn-lang {
        flex: 1;
        padding: 0.45rem 1rem;
        font-size: 0.78rem;
        text-align: center;
    }

    .skill-tooltip {
        position: fixed;
        top: auto;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%) translateY(20px);
        width: calc(100% - 2rem);
        max-width: 420px;
        max-height: 75vh;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        z-index: 99999;
        box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
    }

    .skill-tooltip.active {
        transform: translateX(-50%) translateY(0);
    }

    .skill-tooltip::before,
    .skill-tooltip::after {
        display: none;
    }
}

@media (max-width: 767px) {
    section {
        padding: 3.5rem 0;
    }

    .frame {
        padding: 1.25rem;
    }

    .timeline-item {
        padding-left: 1.25rem;
    }

    .timeline-item::before {
        left: -5px;
    }

    .back-to-top {
        right: 1.25rem;
        bottom: 5.5rem;
    }

    #diagram {
        max-height: 320px;
    }

    #contactForm button[type="submit"] {
        width: 100%;
        min-height: 48px;
    }

    footer {
        padding: 1.8rem 0;
        text-align: center;
    }

    footer .container {
        justify-content: center !important;
        flex-direction: column;
        gap: 1rem !important;
    }

    footer a {
        margin: 0 0.75rem;
    }
}