/* ===== Reset & Variables ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #FAFAF7;
    --color-bg-alt: #F0EFEB;
    --color-surface: #FFFFFF;
    --color-text-primary: #1A1A1A;
    --color-text-body: #3A3A3A;
    --color-text-muted: #7A7A78;
    --color-accent: #1a0c96;
    --color-accent-hover: #140A75;
    --color-accent-light: rgba(26, 12, 150, 0.06);
    --color-border: #E0DFD9;
    --color-border-strong: #C8C7C0;
    --font-display: 'DM Serif Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --nav-width: 64px;
    --container-max: 1100px;
    --section-padding: 120px;
    --radius: 4px;
    --transition: 0.25s ease;
    --animation-duration: 0.4s;
    --animation-easing: cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* Dark theme overrides */
[data-theme="dark"] {
    --color-bg: #121214;
    --color-bg-alt: #1A1A1E;
    --color-surface: #222228;
    --color-text-primary: #E8E8ED;
    --color-text-body: #B8B8C0;
    --color-text-muted: #8A8A92;
    --color-accent: #7B6FD4;
    --color-accent-hover: #6A5DC4;
    --color-accent-light: rgba(123, 111, 212, 0.1);
    --color-border: #2A2A32;
    --color-border-strong: #3A3A44;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* ===== Focus States ===== */
*:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

*:focus:not(:focus-visible) {
    outline: none;
}

.side-nav__dot:focus-visible {
    background: var(--color-accent);
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-light);
}

.side-nav__dot:focus-visible::after {
    opacity: 1;
}

.exp-panel__trigger:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: -2px;
}

.theme-toggle:focus-visible {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-light);
    outline: none;
}

.hero__links a:focus-visible,
.footer__right a:focus-visible,
.footer__email:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

/* ===== Side Navigation (Desktop) ===== */
.side-nav {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--nav-width);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 32px 0;
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    z-index: 100;
}

.side-nav__logo {
    font-family: var(--font-display);
    font-size: 1.125rem;
    color: var(--color-text-primary);
    text-decoration: none;
}

.side-nav__dots {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 28px;
}

.side-nav__dot {
    display: block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 1.5px solid var(--color-text-muted);
    background: transparent;
    transition: all var(--transition);
    position: relative;
    cursor: pointer;
}

.side-nav__dot.active,
.side-nav__dot:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.side-nav__dot::after {
    content: attr(data-label);
    position: absolute;
    left: 22px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-body);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--color-text-body);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
    background: var(--color-bg);
    padding: 2px 8px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

.side-nav__dot:hover::after {
    opacity: 1;
}

.side-nav__socials {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.side-nav__socials a {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 500;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
    transition: color var(--transition);
}

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

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-muted);
    font-size: 1rem;
    transition: color var(--transition), border-color var(--transition);
    line-height: 1;
}

.theme-toggle:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.mobile-nav__actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-nav .theme-toggle {
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
}

/* ===== Mobile Navigation ===== */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.mobile-nav__logo {
    font-family: var(--font-display);
    font-size: 1.125rem;
    color: var(--color-text-primary);
}

.mobile-nav__toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-nav__toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 1px;
    transition: transform var(--transition), opacity var(--transition);
}

.mobile-nav__toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.mobile-nav__toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-nav__toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav__menu {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
}

.mobile-nav__menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
}

.mobile-nav__link {
    padding: 12px 0;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-body);
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav__link:last-child {
    border-bottom: none;
}

/* ===== Main Content ===== */
.main-content {
    margin-left: var(--nav-width);
}

/* ===== Hero: Split-Screen ===== */
.hero {
    display: grid;
    grid-template-columns: 3fr 2fr;
    min-height: 100vh;
    align-items: center;
}

.hero__left {
    padding: 0 80px;
}

.hero__name {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 0.92;
    letter-spacing: -0.03em;
}

.hero__name-first {
    display: block;
    font-size: clamp(3.5rem, 9vw, 8rem);
    color: var(--color-text-primary);
}

.hero__name-last {
    display: block;
    font-size: clamp(3.5rem, 9vw, 8rem);
    color: var(--color-accent);
}

.hero__right {
    padding: 0 60px;
    border-left: 1px solid var(--color-border);
}

.hero__role {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-accent);
}

.hero__at {
    font-family: var(--font-body);
    font-size: 1.375rem;
    font-weight: 300;
    color: var(--color-text-body);
    margin-top: 4px;
}

.hero__divider {
    width: 40px;
    height: 2px;
    background: var(--color-accent);
    margin: 28px 0;
}

.hero__tagline {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--color-text-muted);
    max-width: 340px;
}

.hero__links {
    display: flex;
    gap: 24px;
    margin-top: 32px;
}

.hero__links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-body);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 2px;
    transition: color var(--transition), border-color var(--transition);
}

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

/* ===== Section Heading ===== */
.section-heading {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 400;
    color: var(--color-text-primary);
}

/* ===== Experience: Accordion ===== */
.experience {
    padding: var(--section-padding) 80px;
    max-width: calc(var(--container-max) + 160px);
}

.experience__header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 48px;
    border-bottom: 2px solid var(--color-text-primary);
    padding-bottom: 16px;
}

.section-heading__meta {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.exp-panel {
    border-bottom: 1px solid var(--color-border);
}

.exp-panel__trigger {
    display: grid;
    grid-template-columns: 180px 1fr auto 32px;
    gap: 20px;
    align-items: center;
    width: 100%;
    padding: 20px 0;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    text-align: left;
    transition: all var(--transition);
}

.exp-panel__trigger:hover {
    background: var(--color-accent-light);
    padding-left: 16px;
    padding-right: 16px;
    margin-left: -16px;
    margin-right: -16px;
    width: calc(100% + 32px);
}

.exp-panel__company {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.exp-panel__role {
    font-size: 0.9375rem;
    color: var(--color-text-body);
}

.exp-panel__date {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-align: right;
    white-space: nowrap;
}

.exp-panel__toggle {
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--color-accent);
    transition: transform var(--transition);
    text-align: center;
    line-height: 1;
}

.exp-panel[data-expanded="true"] .exp-panel__toggle {
    transform: rotate(45deg);
}

.exp-panel__body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.exp-panel[data-expanded="true"] .exp-panel__body {
    max-height: 300px;
}

.exp-panel__content {
    padding: 0 0 24px 200px;
}

.exp-panel__details li {
    position: relative;
    padding-left: 24px;
    color: var(--color-text-body);
    font-size: 0.9375rem;
    line-height: 1.8;
}

.exp-panel__details li::before {
    content: '\2014';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
}

.exp-panel__tech {
    margin-top: 12px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    line-height: 1.8;
}

.exp-panel__tech span::after {
    content: '  /  ';
    color: var(--color-border-strong);
}

.exp-panel__tech span:last-child::after {
    content: '';
}

/* ===== Tech Stack Icons ===== */
.exp-panel__tech i,
.exp-panel__tech img {
    font-size: 14px;
    width: 14px;
    height: 14px;
    vertical-align: -2px;
    margin-right: 2px;
    display: inline-block;
}

.skills__item i,
.skills__item img {
    font-size: 18px;
    width: 18px;
    height: 18px;
    vertical-align: -3px;
    margin-right: 6px;
    display: inline-block;
}

/* Invert only dark-colored Simple Icons in dark mode */
[data-theme="dark"] .icon-dark-invert {
    filter: brightness(0) invert(1) !important;
}

/* ===== Skills: Typography-Driven ===== */
.skills {
    padding: var(--section-padding) 0;
    background: var(--color-bg-alt);
}

.skills__inner {
    max-width: calc(var(--container-max) + 160px);
    padding: 0 80px;
}

.skills__inner .section-heading {
    margin-bottom: 48px;
}

.skills__columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.skills__category {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 12px;
    margin-top: 40px;
}

.skills__category:first-child {
    margin-top: 0;
}

.skills__list {
    list-style: none;
}

.skills__item {
    font-size: 1.0625rem;
    font-weight: 400;
    color: var(--color-text-body);
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
    transition: color var(--transition), padding-left var(--transition);
}

.skills__item:hover {
    color: var(--color-accent);
    padding-left: 8px;
}

.skills__item--primary {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
    border-bottom-width: 2px;
    border-bottom-color: var(--color-accent);
}

/* ===== Footer ===== */
.footer {
    padding: 80px 0 40px;
    border-top: 2px solid var(--color-text-primary);
}

.footer__inner {
    max-width: calc(var(--container-max) + 160px);
    padding: 0 80px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 40px;
    align-items: start;
}

.footer__heading {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 3rem);
    font-weight: 400;
    color: var(--color-text-primary);
    margin-bottom: 16px;
    line-height: 1.1;
}

.footer__email {
    font-family: var(--font-display);
    font-size: clamp(1.125rem, 2.5vw, 1.75rem);
    color: var(--color-accent);
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 2px;
    transition: opacity var(--transition);
}

.footer__email:hover {
    opacity: 0.7;
}

.footer__right {
    display: flex;
    flex-direction: column;
    gap: 12px;
    text-align: right;
    padding-top: 8px;
}

.footer__right a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-body);
    border-bottom: 1px solid transparent;
    padding-bottom: 2px;
    transition: border-color var(--transition), color var(--transition);
    display: inline-block;
    align-self: flex-end;
}

.footer__right a:hover {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.footer__languages {
    grid-column: 1 / -1;
    display: flex;
    gap: 24px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.footer__languages-label {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.footer__languages span:not(.footer__languages-label) {
    font-size: 0.9375rem;
    color: var(--color-text-body);
}

.footer__languages em {
    font-style: normal;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.footer__copy {
    grid-column: 1 / -1;
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* ===== Scroll-Triggered Entrance Animations ===== */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition:
        opacity var(--animation-duration) var(--animation-easing),
        transform var(--animation-duration) var(--animation-easing);
    transition-delay: var(--reveal-delay, 0ms);
    will-change: opacity, transform;
}

.reveal--visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal--fade {
    transform: none;
}

.reveal--hero {
    transform: translateY(30px);
}

.reveal--hero.reveal--visible {
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
        will-change: auto;
    }
}

/* ===== Responsive: Tablet ===== */
@media (max-width: 900px) {
    .side-nav {
        display: none;
    }

    .mobile-nav {
        display: flex;
    }

    .main-content {
        margin-left: 0;
        margin-top: 60px;
    }

    .hero {
        grid-template-columns: 1fr;
        min-height: auto;
        padding: 60px 0 40px;
    }

    .hero__left {
        padding: 0 32px;
        margin-bottom: 40px;
    }

    .hero__right {
        padding: 40px 32px 0;
        border-left: none;
        border-top: 1px solid var(--color-border);
    }

    .experience {
        padding: 80px 32px;
    }

    .skills__inner {
        padding: 0 32px;
    }

    .skills {
        padding: 80px 0;
    }

    .skills__columns {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .exp-panel__trigger {
        grid-template-columns: 1fr 32px;
        gap: 4px;
    }

    .exp-panel__company {
        grid-column: 1;
    }

    .exp-panel__role {
        grid-column: 1;
        font-size: 0.875rem;
    }

    .exp-panel__date {
        grid-column: 1;
        text-align: left;
    }

    .exp-panel__toggle {
        grid-row: 1 / 4;
        grid-column: 2;
        align-self: center;
    }

    .exp-panel__content {
        padding-left: 0;
    }

    .footer__inner {
        padding: 0 32px;
    }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 600px) {
    .hero__left {
        padding: 0 24px;
    }

    .hero__right {
        padding: 32px 24px 0;
    }

    .hero__name-first,
    .hero__name-last {
        font-size: 3rem;
    }

    .experience {
        padding: 64px 24px;
    }

    .skills__inner,
    .footer__inner {
        padding: 0 24px;
    }

    .skills {
        padding: 64px 0;
    }

    .footer__languages {
        flex-wrap: wrap;
        gap: 12px 20px;
    }

    .footer__inner {
        grid-template-columns: 1fr;
    }

    .footer__right {
        text-align: left;
        flex-direction: row;
        gap: 20px;
    }

    .footer__right a {
        align-self: flex-start;
    }

    .experience__header {
        flex-direction: column;
        gap: 8px;
    }
}