:root {
    --bg: #f6f8fc;
    --surface: #ffffff;
    --surface-alt: #f0f4fb;
    --text: #0f172a;
    --text-muted: #475569;
    --border: #e2e8f0;
    --brand: #0f62fe;
    --brand-strong: #0043ce;
    --accent: #7c3aed;
    --success: #0f766e;
    --success-soft: #d1fae5;
    --warning: #b45309;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 20px 40px rgba(15, 23, 42, 0.12);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --transition: 180ms ease;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b1220;
        --surface: #111a2e;
        --surface-alt: #172342;
        --text: #f8fafc;
        --text-muted: #94a3b8;
        --border: #1f2b47;
        --brand: #78a9ff;
        --brand-strong: #a6c8ff;
        --accent: #a78bfa;
        --success: #34d399;
        --success-soft: #064e3b;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
        --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
        --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.6);
    }
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

.container {
    width: min(1120px, 100% - 2.5rem);
    margin-inline: auto;
}

.visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    left: -1000px;
    top: 0;
    background: var(--brand);
    color: #fff;
    padding: 0.75rem 1rem;
    border-radius: 0 0 var(--radius-sm) 0;
    z-index: 100;
}

.skip-link:focus {
    left: 0;
}

/* ---------- Header ---------- */
.site-header {
    background: linear-gradient(135deg, rgba(15, 98, 254, 0.08), rgba(124, 58, 237, 0.08));
    border-bottom: 1px solid var(--border);
    padding: 1.25rem 0;
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: saturate(140%) blur(10px);
    background-color: color-mix(in srgb, var(--surface) 82%, transparent);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.brand-title {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.brand-tagline {
    margin: 0;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.55rem 0.9rem;
    border-radius: 999px;
    background: var(--surface);
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
}

.github-link:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ---------- Profile card ---------- */
.profile {
    padding-top: 2.5rem;
}

.profile-card {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1.75rem;
    align-items: center;
    padding: 1.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.profile-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top left, color-mix(in srgb, var(--brand) 12%, transparent), transparent 60%),
                radial-gradient(circle at bottom right, color-mix(in srgb, var(--accent) 12%, transparent), transparent 55%);
    pointer-events: none;
}

.profile-card > * {
    position: relative;
}

.profile-card__avatar-wrap {
    width: 128px;
    height: 128px;
    border-radius: 50%;
    padding: 4px;
    background: linear-gradient(135deg, var(--brand), var(--accent));
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
}

.profile-card__avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    background: var(--surface-alt);
    display: block;
}

.profile-card__eyebrow {
    margin: 0 0 0.25rem;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    font-weight: 600;
    color: var(--text-muted);
}

.profile-card__name {
    margin: 0 0 0.35rem;
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--brand), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.profile-card__headline {
    margin: 0 0 0.85rem;
    font-size: 1rem;
    color: var(--text);
    max-width: 60ch;
}

.profile-card__location {
    margin: 0 0 0.85rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.profile-card__location::before {
    content: '\1F4CD';
    font-size: 0.9rem;
}

.profile-card__links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.profile-link {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.5rem 0.9rem;
    background: var(--surface-alt);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 999px;
    text-decoration: none;
    font-size: 0.86rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), color var(--transition);
}

.profile-link:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    border-color: color-mix(in srgb, var(--brand) 40%, var(--border));
    color: var(--brand-strong);
}

.profile-link svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

@media (max-width: 640px) {
    .profile-card {
        grid-template-columns: 1fr;
        text-align: center;
        justify-items: center;
        gap: 1.1rem;
    }

    .profile-card__avatar-wrap {
        width: 108px;
        height: 108px;
    }

    .profile-card__links {
        justify-content: center;
    }

    .profile-card__location {
        justify-content: center;
    }
}

/* ---------- Hero ---------- */
.hero {
    padding: 2rem 0 1.5rem;
    text-align: center;
}

.hero-title {
    font-size: clamp(1.9rem, 4vw, 2.9rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin: 0 0 1rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--brand), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-lede {
    max-width: 68ch;
    margin: 0 auto;
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* ---------- Progress panel ---------- */
.progress-panel {
    margin-top: 2rem;
    padding: 1.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.section-heading {
    margin: 0 0 1.25rem;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.005em;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    padding: 1.1rem 1.15rem;
    background: var(--surface-alt);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    transition: transform var(--transition), border-color var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: var(--border);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.stat-value {
    font-size: 1.9rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
}

.stat-card--achieved .stat-value {
    color: var(--success);
}

.stat-card--percent .stat-value {
    background: linear-gradient(135deg, var(--brand), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.progress-bar {
    height: 12px;
    background: var(--surface-alt);
    border-radius: 999px;
    overflow: hidden;
    box-shadow: inset 0 0 0 1px var(--border);
}

.progress-bar__fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--brand), var(--accent));
    border-radius: inherit;
    transition: width 900ms cubic-bezier(.22, 1, .36, 1);
}

.progress-caption {
    margin: 0.9rem 0 0;
    font-size: 0.82rem;
    color: var(--text-muted);
    text-align: right;
}

/* ---------- Controls ---------- */
.controls {
    margin-top: 2.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    align-items: center;
}

.filter-group {
    display: inline-flex;
    background: var(--surface);
    padding: 0.3rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    gap: 0.15rem;
    flex-wrap: wrap;
}

.chip {
    appearance: none;
    border: 0;
    background: transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.88rem;
    font-weight: 500;
    padding: 0.55rem 1.1rem;
    border-radius: 999px;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}

.chip:hover {
    color: var(--text);
    background: var(--surface-alt);
}

.chip.is-active {
    background: linear-gradient(135deg, var(--brand), var(--accent));
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.control-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.search-field,
.sort-field {
    display: inline-flex;
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.15rem 0.85rem;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.search-field:focus-within,
.sort-field:focus-within {
    border-color: var(--brand);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 25%, transparent);
}

.search-field svg {
    color: var(--text-muted);
    flex-shrink: 0;
}

.search-field input,
.sort-field select {
    appearance: none;
    background: transparent;
    border: 0;
    outline: 0;
    padding: 0.6rem 0.5rem;
    font-family: inherit;
    font-size: 0.9rem;
    color: var(--text);
    min-width: 220px;
}

.sort-field select {
    padding-right: 1.5rem;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%23475569' d='M5 6 0 0h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.35rem center;
}

/* ---------- Skills grid ---------- */
.skills {
    padding: 2rem 0 3.5rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.1rem;
}

.skill-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.35rem 1.4rem 1.25rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    animation: card-in 380ms cubic-bezier(.22, 1, .36, 1) both;
}

.skill-card::before {
    content: '';
    position: absolute;
    inset: 0 0 auto 0;
    height: 4px;
    background: linear-gradient(90deg, var(--brand), var(--accent));
    opacity: 0;
    transition: opacity var(--transition);
}

.skill-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: color-mix(in srgb, var(--brand) 35%, var(--border));
}

.skill-card:hover::before,
.skill-card.is-achieved::before {
    opacity: 1;
}

.skill-card.is-achieved {
    background: linear-gradient(180deg, color-mix(in srgb, var(--success-soft) 55%, var(--surface)), var(--surface));
}

.skill-card.is-retired {
    opacity: 0.85;
}

.skill-card.is-retired .skill-card__title {
    color: var(--text-muted);
}

.skill-card.is-retired.is-achieved {
    opacity: 1;
}

.skill-card.is-retired.is-achieved .skill-card__title {
    color: var(--text);
}

.skill-card__badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    align-items: center;
}

.skill-card__status {
    display: inline-flex;
    align-items: center;
 

.skill-card__badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.3rem 0.6rem;
    border-radius: 999px;
    border: 1px solid transparent;
}

.skill-card__badge--retired {
    background: color-mix(in srgb, var(--text-muted) 15%, transparent);
    color: var(--text-muted);
    border-color: color-mix(in srgb, var(--text-muted) 25%, transparent);
}

.skill-card__badge--soon {
    background: color-mix(in srgb, var(--warning) 15%, transparent);
    color: var(--warning);
    border-color: color-mix(in srgb, var(--warning) 30%, transparent);
}   gap: 0.4rem;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.3rem 0.65rem;
    border-radius: 999px;
    background: var(--surface-alt);
    color: var(--text-muted);
}

.skill-card.is-achieved .skill-card__status {
    background: var(--success-soft);
    color: var(--success);
}

.skill-card__status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: currentColor;
    box-shadow: 0 0 0 3px color-mix(in srgb, currentColor 25%, transparent);
}

.skill-card__title {
    margin: 0;
    font-size: 1.02rem;
    font-weight: 700;
    letter-spacing: -0.005em;
    line-height: 1.35;
}

.skill-card__notes {
    margin: 0;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.skill-card__meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding-top: 0.9rem;
    border-top: 1px dashed var(--border);
    font-size: 0.83rem;
    color: var(--text-muted);
    margin-top: auto;
}

.skill-card__date {
    font-variant-numeric: tabular-nums;
    font-weight: 500;
}

.skill-card__date strong {
    color: var(--success);
    font-weight: 600;
}

.skill-card__link {
    color: var(--brand);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    transition: gap var(--transition), color var(--transition);
}

.skill-card__link:hover {
    color: var(--brand-strong);
    gap: 0.45rem;
}

.skill-card__link::after {
    content: '\2192';
}

@keyframes card-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---------- Empty & loading states ---------- */
.empty-state,
.loading-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.empty-state__title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 0.35rem;
}

.empty-state__body {
    margin: 0;
    font-size: 0.95rem;
}

/* ---------- Footer ---------- */
.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    margin-top: 2rem;
}

.footer-inner {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.88rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.footer-inner a {
    color: var(--brand);
    text-decoration: none;
    font-weight: 500;
}

.footer-inner a:hover {
    text-decoration: underline;
}

.footer-meta {
    margin: 0;
    font-size: 0.8rem;
    opacity: 0.85;
}

/* ---------- Responsive tweaks ---------- */
@media (max-width: 640px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .brand-tagline {
        display: none;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .control-row {
        flex-direction: column;
    }

    .search-field input,
    .sort-field select {
        width: 100%;
        min-width: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        transition-duration: 0.001ms !important;
    }
}