:root {
    --bg: #0d0d0f;
    --surface: #141416;
    --surface-hover: #1a1a1d;
    --border: rgba(255, 255, 255, 0.07);
    --border-hover: rgba(255, 255, 255, 0.14);
    --text-primary: #f0ede8;
    --text-secondary: #7a7874;
    --text-muted: #3d3c3a;

    --blue: #4a9eff;
    --blue-dim: rgba(74, 158, 255, 0.12);
    --blue-bar: linear-gradient(90deg, #4a9eff, #7eb8ff);

    --green: #3ecf8e;
    --green-dim: rgba(62, 207, 142, 0.12);
    --green-bar: linear-gradient(90deg, #3ecf8e, #6edba9);

    --purple: #a78bfa;
    --purple-dim: rgba(167, 139, 250, 0.12);
    --purple-bar: linear-gradient(90deg, #a78bfa, #c4b0fd);

    --radius-card: 16px;
    --radius-sm: 8px;
    --font-display: 'Syne', sans-serif;
    --font-body: 'DM Sans', sans-serif;
}

.skills-section {
    width: 100%;
    margin-top: 1rem;
    margin-bottom: 2rem;
    border: 1.5px solid var(--border);
    border-radius: 15px;
    background: none;
    padding: 1.3rem 1.2rem;
    padding-bottom: 10px;
}

.skills-title {
    font-family: var(--font-display);
    font-size: 42px;
    text-align: center;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.skills-title span {
    color: var(--blue);
}

.category-card {
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: border-color 0.2s;
}

.category-card:hover {
    border-color: var(--border-hover);
}

.category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.7rem 0.9rem;
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
    transition: background 0.15s;
}

.cat-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.cat-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.cat-icon svg {
    width: 20px;
    height: 20px;
}

.cat-icon.frontend {
    background: var(--blue-dim);
}

.cat-icon.frontend svg {
    color: var(--blue);
}

.cat-icon.backend {
    background: var(--green-dim);
}

.cat-icon.backend svg {
    color: var(--green);
}

.cat-icon.languages {
    background: var(--purple-dim);
}

.cat-icon.languages svg {
    color: var(--purple);
}

.cat-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.cat-title {
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.cat-subtitle {
    font-size: 12px;
    color: var(--text-secondary);
}

.cat-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.cat-tag {
    font-size: 11px;
    font-weight: 500;
    padding: 3px 10px;
    border-radius: 99px;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    display: none;
}

@media (min-width: 480px) {
    .cat-tag {
        display: block;
    }
}

.cat-tag.frontend {
    border-color: rgba(74, 158, 255, 0.25);
    color: var(--blue);
    background: var(--blue-dim);
}

.cat-tag.backend {
    border-color: rgba(62, 207, 142, 0.25);
    color: var(--green);
    background: var(--green-dim);
}

.cat-tag.languages {
    border-color: rgba(167, 139, 250, 0.25);
    color: var(--purple);
    background: var(--purple-dim);
}

.chevron {
    width: 18px;
    height: 18px;
    color: var(--text-muted);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.2s;
    flex-shrink: 0;
}

.chevron.open {
    transform: rotate(180deg);
    color: var(--text-secondary);
}

.skills-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.skills-body.open {
    max-height: 600px;
}

.skills-body-inner {
    padding: 0 1.4rem 1.4rem;
    border-top: 1px solid var(--border);
}

.skills-grid-inner {
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding-top: 1.2rem;
}

.skill-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.skill-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 400;
}

.skill-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.skill-dot.blue {
    background: var(--blue);
}

.skill-dot.green {
    background: var(--green);
}

.skill-dot.purple {
    background: var(--purple);
}

.skill-pct {
    font-family: var(--font-display);
    font-size: 11px;
    font-weight: 400;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.bar-track {
    height: 4px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 99px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    border-radius: 99px;
    width: 0;
    transition: width 0.75s cubic-bezier(0.4, 0, 0.2, 1);
}

.bar-fill.blue {
    background: var(--blue-bar);
}

.bar-fill.green {
    background: var(--green-bar);
}

.bar-fill.purple {
    background: var(--purple-bar);
}

/* scrollbar */
::-webkit-scrollbar {
    width: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 2px;
}