:root {
    --bg-color: #F4F4F0;
    --text-primary: #000000;
    --border-color: #000000;
    --font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --spacing-unit: 24px;
    --max-width: 500px;
    --border-weight: 4px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: #ECECEC;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.4;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 20px;
}

.app-container {
    width: 100%;
    max-width: var(--max-width);
    background-color: var(--bg-color);
    border: var(--border-weight) solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: 10px 10px 0px rgba(0,0,0,0.1);
}

/* ── Header ── */
header {
    padding: 40px var(--spacing-unit);
    border-bottom: var(--border-weight) solid var(--border-color);
    background: var(--bg-color);
    text-decoration: none;
    display: block;
    color: var(--text-primary);
    transition: background 0.2s;
}
header:hover { background: #000; color: #fff; }
header:hover .brand-light { color: #ccc; }

.brand-bold {
    font-weight: 700;
    display: block;
    font-size: 32px;
    line-height: 1;
    margin-bottom: 4px;
}
.brand-light {
    font-weight: 400;
    font-size: 18px;
    opacity: 0.8;
}

/* ── Back Button ── */
.back-btn {
    padding: 24px var(--spacing-unit);
    border-bottom: var(--border-weight) solid var(--border-color);
    cursor: pointer;
    font-weight: 700;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all 0.2s ease;
    background: var(--bg-color);
    display: block;
    text-decoration: none;
    color: var(--text-primary);
}
.back-btn:hover { background-color: #000; color: #fff; }

/* ── Category Cards (index) ── */
.category-card {
    padding: 40px var(--spacing-unit);
    border-bottom: var(--border-weight) solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--bg-color);
    text-decoration: none;
    color: var(--text-primary);
}
.category-card:last-child { border-bottom: none; }
.category-card:hover, .category-card:active {
    background-color: #000;
    color: #fff;
}
.category-card:hover .category-description { color: #ccc; }
.category-card:hover .category-arrow { stroke: #fff; }

.category-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 80%;
}
.category-title {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 0.95;
    text-transform: uppercase;
}
.category-description {
    font-size: 15px;
    line-height: 1.4;
    font-weight: 500;
}
.category-arrow {
    width: 40px;
    height: 40px;
    stroke: var(--text-primary);
    stroke-width: 2.5;
    flex-shrink: 0;
    margin-top: 4px;
}

/* ── Section Header ── */
.section-header {
    padding: 16px var(--spacing-unit);
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--bg-color);
    border-bottom: 2px solid var(--border-color);
    opacity: 0.6;
}

/* ── List Items ── */
.resource-list { display: flex; flex-direction: column; }

.list-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 20px var(--spacing-unit);
    border-bottom: var(--border-weight) solid var(--border-color);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.2s ease;
    background: var(--bg-color);
}
.list-item:last-child { border-bottom: none; }
.list-item:hover, .list-item:active { background-color: #000; color: #fff; }
.list-item:hover .item-meta { color: #ccc; }
.list-item:hover .item-right { color: #fff; border-color: #fff; }

.item-left {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-right: 10px;
}
.item-title {
    font-size: 19px;
    letter-spacing: -0.02em;
    font-weight: 700;
    line-height: 1.2;
}
.item-meta {
    font-size: 13px;
    text-transform: uppercase;
    font-weight: 600;
    opacity: 0.6;
}
.item-right {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    white-space: nowrap;
    border: 2px solid var(--border-color);
    padding: 4px 8px;
    margin-top: 2px;
}

/* ── About Page ── */
.about-hero {
    padding: 40px var(--spacing-unit) 32px;
    border-bottom: var(--border-weight) solid var(--border-color);
}
.about-name {
    font-size: 38px;
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 0.95;
    text-transform: uppercase;
    margin-bottom: 12px;
}
.about-tagline {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    opacity: 0.55;
    margin-bottom: 20px;
}
.about-bio {
    font-size: 15px;
    line-height: 1.6;
}
.about-contact-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}
.contact-chip {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border: 2px solid var(--border-color);
    padding: 5px 10px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.2s ease;
}
.contact-chip:hover { background: #000; color: #fff; border-color: #000; }

.exp-item {
    padding: 24px var(--spacing-unit);
    border-bottom: var(--border-weight) solid var(--border-color);
}
.exp-item:last-child { border-bottom: none; }
.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 6px;
}
.exp-role {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}
.exp-date {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border: 2px solid var(--border-color);
    padding: 3px 7px;
    white-space: nowrap;
    flex-shrink: 0;
    margin-top: 2px;
}
.exp-company {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.55;
    margin-bottom: 10px;
}
.exp-bullets {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 5px;
}
.exp-bullets li {
    font-size: 14px;
    line-height: 1.5;
    padding-left: 14px;
    position: relative;
}
.exp-bullets li::before {
    content: '—';
    position: absolute;
    left: 0;
    font-weight: 700;
}

.skills-block {
    padding: 24px var(--spacing-unit);
    border-bottom: var(--border-weight) solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.skills-block:last-child { border-bottom: none; }
.skill-row { display: flex; flex-direction: column; gap: 4px; }
.skill-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.5;
}
.skill-value { font-size: 14px; font-weight: 500; line-height: 1.4; }

.edu-item {
    padding: 20px var(--spacing-unit);
    border-bottom: var(--border-weight) solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
}
.edu-item:last-child { border-bottom: none; }
.edu-degree { font-size: 16px; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 3px; }
.edu-school { font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; opacity: 0.55; }
.edu-year {
    font-size: 13px;
    font-weight: 700;
    border: 2px solid var(--border-color);
    padding: 3px 8px;
    white-space: nowrap;
    flex-shrink: 0;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 12px; }
::-webkit-scrollbar-track { background: var(--bg-color); border-left: var(--border-weight) solid var(--border-color); }
::-webkit-scrollbar-thumb { background: #000; border: 3px solid var(--bg-color); }

/* ── Mobile ── */
@media (max-width: 480px) {
    body { padding: 0; background-color: var(--bg-color); }
    .app-container { border: none; box-shadow: none; max-width: 100%; }
    .category-title { font-size: 32px; }
    .about-name { font-size: 30px; }
}
@media (min-width: 768px) {
    body { background-color: #E0E0E0; }
}