/* ==========================================================================
   CUSTOM PROPERTIES
   ========================================================================== */

:root {
    /* Colors */
    --color-background:          #ffffff;
    --color-background-dark:     #252525;
    --color-background-page:     #fafafa;
    --color-text:        #252525;
    --color-text-light:  #ffffff;
    --color-accent:      #0066cc;
    --color-accent-hover:#0080ff;
    --color-gray-light:  #dfdfdf;
    --color-gray-dark:   #9f9f9f;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base:  16px;
    --font-size-small: 14px;
    --font-size-h1:    40px;
    --font-size-h2:    28px;
    --font-size-h3:    20px;
    --line-height-base:  1.6;
    --line-height-small: 1.5;
    --line-height-h1:    0.65;
    --line-height-h2:    1.3;
    --line-height-h3:    1.4;

    /* Spacing (multiples of 4) */
    --spacing-4:  4px;
    --spacing-8:  8px;
    --spacing-16: 16px;
    --spacing-24: 24px;
    --spacing-32: 32px;
    --spacing-36: 36px;
    --spacing-40: 40px;
    --spacing-48: 48px;
    --spacing-80: 80px;

    /* Layout */
    --max-width: 80ch;

    /* Misc */
    --transition: all 0.3s ease;
    --shadow: 0 2px 5px rgba(0, 0, 0, 0.16), 0 2px 10px rgba(0, 0, 0, 0.12);
    --radius: 4px;
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background-page);
}

/* ==========================================================================
   FOCUS
   ========================================================================== */

*:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    margin-bottom: var(--spacing-16);
}

h1 {
    font-size: var(--font-size-h1);
    line-height: var(--line-height-h1);
    margin-bottom: var(--spacing-24);
    color: var(--color-accent);
}

h2 {
    font-size: var(--font-size-h2);
    line-height: var(--line-height-h2);
    margin-bottom: var(--spacing-24);
}

h3 {
    font-size: var(--font-size-h3);
    line-height: var(--line-height-h3);
    color: var(--color-accent);
}

p {
    margin-bottom: var(--spacing-16);
    text-align: left;
}

ul {
    margin-bottom: var(--spacing-16);
    padding-left: var(--spacing-24);
    list-style: none;
}

li {
    margin-bottom: var(--spacing-8);
}

li::before {
    content: "\2022";
    color: var(--color-accent);
    display: inline-block;
    width: 1em;
    margin-left: -1em;
}

small {
    font-size: var(--font-size-small);
    line-height: var(--line-height-small);
}

.bullet {
    display: inline !important;
    vertical-align: middle;
    font-size: 0.5em;
}

.title-break {
    display: block;
}

hr {
    height: 2px;
    max-width: var(--max-width);
    margin: 0 auto;
    border: none;
    background: linear-gradient(90deg, transparent, var(--color-accent) 50%, transparent);
}

/* ==========================================================================
   LINKS & BUTTONS
   ========================================================================== */

a {
    color: var(--color-accent);
    text-decoration: underline;
    transition: var(--transition);
}

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

.button {
    display: inline-block;
    padding: var(--spacing-8) var(--spacing-16);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border-radius: var(--radius);
    border: 2px solid var(--color-accent);
    background-color: var(--color-accent);
    color: var(--color-text-light);
    cursor: pointer;
    transition: var(--transition);
}

.button:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: var(--color-text-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* ==========================================================================
   ICONS (SVG sprite references)
   ========================================================================== */

svg.icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    vertical-align: middle;
    color: currentColor;
}

/* ==========================================================================
   LAYOUT PRIMITIVES
   ========================================================================== */

header,
section {
    padding: var(--spacing-48) 0;
}

.container {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-16);
    gap: var(--spacing-32);
}

/* Cards */
.card {
    background: var(--color-background);
    padding: var(--spacing-16);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
}

/* Flex grid + column helpers */
.flex-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-24);
}

.full-width {
    flex: 1 0 100%;
}

.half-width {
    flex: 1 0 calc(50% - 24px);
    min-width: 300px;
}

/* Utility */
.white {
    color: var(--color-text-light);
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */

nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--color-background-dark);
    color: var(--color-text-light);
    padding: var(--spacing-16) 0;
    box-shadow: var(--shadow);
}

nav .container {
    gap: 0;
    align-items: center;
}

/* Logo */
.logo {
    font-weight: 600;
    font-size: 22px;
}

.logo a {
    text-decoration: none;
}

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

/* Language switch */
.language-switch {
    display: flex;
    align-items: center;
    margin-left: auto;
    margin-right: var(--spacing-8);
    text-decoration: none;
    line-height: 0;
    transition: var(--transition);
}

.language-switch:hover {
    transform: translateY(-1px);
}

svg.flag {
    display: block;
    width: 28px;
    height: 19px;
    border-radius: 2px;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.2);
}

#navigation-toggle {
    display: none;
}

.navigation-hamburger {
    position: relative;
    display: flex;
    width: 44px;
    height: 44px;
    cursor: pointer;
    justify-content: center;
    align-items: center;
    margin: 0;
    -webkit-tap-highlight-color: transparent;
}

.navigation-hamburger-bar,
.navigation-hamburger-bar::before,
.navigation-hamburger-bar::after {
    display: block;
    position: absolute;
    width: 30px;
    height: 4px;
    background-color: var(--color-text-light);
    border-radius: var(--radius);
    pointer-events: none;
    transition: transform 400ms cubic-bezier(0.23, 1, 0.32, 1),
                background-color 400ms cubic-bezier(0.23, 1, 0.32, 1),
                margin-top 400ms cubic-bezier(0.23, 1, 0.32, 1);
}

.navigation-hamburger-bar::before {
    content: "";
    margin-top: -10px;
}

.navigation-hamburger-bar::after {
    content: "";
    margin-top: 10px;
}

/* Animate hamburger → X */
#navigation-toggle:checked + .navigation-hamburger .navigation-hamburger-bar {
    background-color: transparent;
}

#navigation-toggle:checked + .navigation-hamburger .navigation-hamburger-bar::before {
    margin-top: 0;
    transform: rotate(405deg);
}

#navigation-toggle:checked + .navigation-hamburger .navigation-hamburger-bar::after {
    margin-top: 0;
    transform: rotate(-405deg);
}

/* Menu list — dropdown below the nav bar */
.navigation-menu {
    list-style: none;
    margin: 0;
    padding: 0;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
}

.navigation-menu > li {
    display: flex;
    justify-content: center;
    width: 100%;
    background-color: var(--color-background-dark);
    line-height: 3em;
    margin: 0;
    height: 0;
    overflow: hidden;
    transition: height 400ms cubic-bezier(0.23, 1, 0.32, 1);
}

#navigation-toggle:checked ~ .navigation-menu > li {
    height: 3em;
}

.navigation-menu li::before {
    display: none;
}

.navigation-menu a {
    color: var(--color-text-light);
    text-decoration: none;
}

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

/* ==========================================================================
   HERO
   ========================================================================== */

#hero {
    background-color: var(--color-background-dark);
    color: var(--color-text-light);
    text-align: center;
}

.hero-meta {
    flex: 1 0 100%;
}

.hero-meta span {
    display: block;
}

.hero-meta h1 span {
    display: inline;
}

.headshot-container {
    margin: 0 auto;
    border: 5px solid var(--color-accent);
    border-radius: 50%;
    width: 200px;
    height: 200px;
}

.headshot {
    border-radius: 50%;
    width: 190px;
    height: 190px;
    filter: grayscale(1);
}

.headline {
    color: var(--color-gray-dark);
    font-weight: 600;
    margin-bottom: var(--spacing-16);
}

.hero-links {
    display: inline-flex;
    flex-wrap: wrap;
    gap: var(--spacing-16);
    margin-top: var(--spacing-36);
}

.hero-links a {
    font-weight: 600;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.summary {
    max-width: var(--max-width);
    margin: var(--spacing-40) auto 0;
    padding: 0 var(--spacing-16);
}

.summary p {
    text-align: justify;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    max-width: var(--max-width);
    margin: var(--spacing-24) auto 0;
    padding: 0 var(--spacing-16);
    gap: var(--spacing-24);
}

/* ==========================================================================
   EXPERIENCE & EDUCATION (Timeline)
   ========================================================================== */

.experience-meta {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--spacing-16);
}

.experience-company {
    font-weight: 600;
}

/* --- Timeline structure --- */

.timeline {
    position: relative;
    flex: 1 0 100%;
    padding-left: 44px;
}

/* Vertical line */
.timeline::before {
    content: "";
    position: absolute;
    left: 14px;
    top: 6px;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-accent) 0%, var(--color-accent) 90%, transparent 100%);
    border-radius: 1px;
}

/* Phase group */
.timeline-phase {
    position: relative;
    margin-bottom: var(--spacing-16);
}

.timeline-phase:last-child {
    margin-bottom: 0;
}

/* Phase header — label sits on the timeline */
.timeline-phase-header {
    position: relative;
    margin-bottom: var(--spacing-8);
    padding: var(--spacing-4) 0;
    margin-left: -42px;
    background-color: var(--color-background-page);
}

/* Diamond marker */
.timeline-phase-header::before {
    content: "";
    position: absolute;
    left: -36px;
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
    width: 14px;
    height: 14px;
    background: var(--color-text-light);
    box-shadow: 0 0 0 4px var(--color-background-page);
}

.timeline-phase-label {
    display: block;
    font-weight: 600;
    font-size: var(--font-size-h3);
    padding: var(--spacing-24) 0;
}

.timeline-phase-label-first {
    display: block;
    font-weight: 600;
    font-size: var(--font-size-h3);
    padding: 0 0 var(--spacing-24) 0;
}

/* Individual timeline items */
.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-24);
}

.timeline-phase .timeline-item:last-child {
    margin-bottom: 0;
}

/* Diamond marker on items */
.timeline-item::before {
    content: "";
    position: absolute;
    left: -36px;
    top: 30px;
    transform: translateY(-50%) rotate(45deg);
    width: 14px;
    height: 14px;
    background: var(--color-accent);
    box-shadow: 0 0 0 4px var(--color-background-page);
}

.timeline-item--solo {
    margin-bottom: 0;
}

/* ==========================================================================
   SKILLS (dot rating)
   ========================================================================== */

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

.skill-list li::before {
    display: none;
}

.skill {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-16);
    padding: var(--spacing-8) 0;
    margin-bottom: 0;
}

.skill-dots {
    display: inline-flex;
    gap: 4px;
    flex-shrink: 0;
}

.skill-dots i {
    display: block;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-gray-light);
    transition: var(--transition);
}

/* Fill dots based on data-level */
.skill[data-level="1"] .skill-dots i:nth-child(-n+1),
.skill[data-level="2"] .skill-dots i:nth-child(-n+2),
.skill[data-level="3"] .skill-dots i:nth-child(-n+3) {
    background: var(--color-accent);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

footer {
    background-color: var(--color-background-dark);
    color: var(--color-gray-light);
    padding: var(--spacing-32) 0;
    text-align: center;
}

/* ==========================================================================
   SCROLL-TO-TOP BUTTON
   ========================================================================== */

.scroll-top {
    position: fixed;
    bottom: var(--spacing-24);
    right: var(--spacing-24);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-accent);
    color: var(--color-text-light);
    border: none;
    box-shadow: var(--shadow);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease, background 0.3s ease, visibility 0.3s;
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

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

.scroll-top svg {
    width: 20px;
    height: 20px;
}

/* ==========================================================================
   SCROLL-REVEAL ANIMATION (replaces AOS library)
   ========================================================================== */

.reveal {
    opacity: 0;
    transform: translateY(30px) scale(0.97);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.reveal-flip {
    opacity: 0;
    transform: perspective(800px) rotateX(60deg);
    transform-origin: center bottom;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-flip.visible {
    opacity: 1;
    transform: perspective(800px) rotateX(0);
}

/* ==========================================================================
   RESPONSIVE — DESKTOP (≥768px)
   ========================================================================== */

@media (min-width: 768px) {

    header,
    section {
        padding: var(--spacing-80) 0;
    }

    .title-break {
        display: none;
    }

    /* Hero: left-aligned, side-by-side */
    #hero {
        text-align: left;
    }

    .hero-meta {
        flex: 1 0 50%;
    }

    /* Experience meta: row layout */
    .experience-meta {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-start;
    }
}