.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #000;
    color: #fff;
    padding: 0.5rem 1rem;
    z-index: 999;
    text-decoration: none;
}

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

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

:root {
    --color-bg: #e2e8f0;
    --color-text: #1f2937;
    --color-primary: #0f7d48;
    --color-primary-dark: #1f634a;
    --color-accent: #2ca860;
    --color-surface: #ffffff;
    --color-border: #ddd;
    --color-muted: #555;
}

body {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.9s ease 0.15s, transform 0.9s ease 0.15s;
}

body.loaded {
    opacity: 1;
    transform: translateY(0);
}

noscript body {
    opacity: 1;
    transform: none;
}

[data-theme="dark"] {
    --color-bg: #121212;
    --color-text: #f1f1f1;
    --color-primary: #2f9a5d;
    --color-primary-dark: #207548;
    --color-accent: #45b26d;
    --color-surface: #1f2730;
    --color-border: #2f3a45;
    --color-muted: #aaa;
}

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

body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

.container {
    max-width: 1024px;
    margin: 0 auto;
    padding: 1rem;
}

.site-header {
    background: var(--color-primary);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.2rem;
    text-decoration: none;
    color: white;
    font-weight: bold;
}

.nav {
    display: flex;
    gap: 1rem;
}

.nav a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    padding: 0.3rem 0.45rem;
    border-radius: 0.3rem;
}

.nav a:hover,
.nav a:focus-visible,
.nav a.active {
    background: white;
    color: var(--color-primary);
}

.menu-toggle,
.toggle-btn {
    background: var(--color-primary-dark);
    color: white;
    border: 1px solid rgba(255,255,255,.4);
    padding: 0.45rem 0.8rem;
    font-size: 0.95rem;
    cursor: pointer;
    border-radius: 0.3rem;
}

.toggle-btn {
    display: inline-block;
}

.background {
    background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
    color: white;
    padding: 6rem 0 4rem;
    text-align: center;
}

.profile-img {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    border: 3px solid rgba(255,255,255,.95);
    object-fit: cover;
    margin: 0 auto 1rem;
    display: block;
}

.background h1 {
    margin-bottom: 1rem;
    font-size: clamp(1.8rem, 4vw, 3.2rem);
}
.background p {
    max-width: 640px;
    margin: 0 auto 1.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 140px;
    text-align: center;
    text-decoration: none;
    background: #ff6f61;
    color: white;
    padding: 0.75rem 1.25rem;
    border-radius: 0.4rem;
    font-weight: 700;
    border: none;
    transition: transform 0.2s ease, filter 0.2s ease;
}

.btn:hover,
.btn:focus {
    transform: translateY(-1px);
    filter: brightness(1.07);
}

.btn:focus-visible,
.menu-toggle:focus-visible,
.toggle-btn:focus-visible,
.nav a:focus-visible,
.card:focus-visible {
    outline: 3px solid #ffbf47;
    outline-offset: 3px;
}

.colorblind-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: #55697b;
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.2);
    padding: 0.5rem;
    display: none;
    flex-direction: column;
    min-width: 200px;
    z-index: 1000;
}

.colorblind-menu.open {
    display: flex;
}

.colorblind-menu button {
    background: transparent;
    border: none;
    text-align: left;
    padding: 0.5rem 0.75rem;
    width: 100%;
    color: var(--color-text);
    cursor: pointer;
    border-radius: 0.3rem;
}

.colorblind-menu button:hover,
.colorblind-menu button:focus-visible {
    background: var(--color-border);
}

.colorblind-menu button.active {
    background: var(--color-primary);
    color: white;
}

.btn-secondary {
    background: #1f8e66;
}

.project-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1rem;
}

.section {
    padding: 3rem 0;
    background: var(--color-surface);
}

.section:nth-of-type(even) {
    background: var(--color-bg);
}

.section h2 {
    margin-bottom: 1rem;
    font-size: 2rem;
    text-align: center;
    color: var(--color-text);
}

.section p,
.section a {
    display: block;
    text-align: center;
    max-width: 780px;
    margin: 0.5rem auto;
    color: var(--color-text);
}

.projects .grid {
    display: grid;
    grid-template-columns: repeat( auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.project-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1rem;
}

.project-date {
    margin-top: 0.5rem;
    color: var(--color-muted);
    font-size: 0.9rem;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    padding: 1rem;
    box-shadow: 0 3px 6px rgba(0,0,0,0.05);
}

.card h3 {
    margin-bottom: 0.6rem;
    color: var(--color-text);
}

.site-footer {
    text-align: center;
    padding: 1.25rem 0;
    background: var(--color-primary);
    color: white;
}

body.colorblind-off {
    filter: none;
}

body.colorblind-protanopia {
    filter: grayscale(0.20) contrast(1.2) hue-rotate(20deg);
}

body.colorblind-deuteranopia {
    filter: grayscale(0.20) contrast(1.2) hue-rotate(-20deg);
}

body.colorblind-tritanopia {
    filter: grayscale(0.20) contrast(1.2) hue-rotate(40deg);
}

body.colorblind-achromatopsia {
    filter: grayscale(1) contrast(1.25) brightness(1.02);
}

body.colorblind-off .site-header,
body.colorblind-off .site-footer,
body.colorblind-off .btn,
body.colorblind-off .btn-secondary,
body.colorblind-off .card,
body.colorblind-protanopia .site-header,
body.colorblind-protanopia .site-footer,
body.colorblind-protanopia .btn,
body.colorblind-protanopia .btn-secondary,
body.colorblind-protanopia .card,
body.colorblind-deuteranopia .site-header,
body.colorblind-deuteranopia .site-footer,
body.colorblind-deuteranopia .btn,
body.colorblind-deuteranopia .btn-secondary,
body.colorblind-deuteranopia .card,
body.colorblind-tritanopia .site-header,
body.colorblind-tritanopia .site-footer,
body.colorblind-tritanopia .btn,
body.colorblind-tritanopia .btn-secondary,
body.colorblind-tritanopia .card,
body.colorblind-achromatopsia .site-header,
body.colorblind-achromatopsia .site-footer,
body.colorblind-achromatopsia .btn,
body.colorblind-achromatopsia .btn-secondary,
body.colorblind-achromatopsia .card {
    border: 2px solid #000;
    box-shadow: none;
}

body.colorblind-off .background,
body.colorblind-off .project-controls,
body.colorblind-off .site-header,
body.colorblind-protanopia .background,
body.colorblind-protanopia .project-controls,
body.colorblind-protanopia .site-header,
body.colorblind-deuteranopia .background,
body.colorblind-deuteranopia .project-controls,
body.colorblind-deuteranopia .site-header,
body.colorblind-tritanopia .background,
body.colorblind-tritanopia .project-controls,
body.colorblind-tritanopia .site-header,
body.colorblind-achromatopsia .background,
body.colorblind-achromatopsia .project-controls,
body.colorblind-achromatopsia .site-header {
    filter: contrast(1.3) saturate(0.95);
}

@media (max-width: 768px) {
    .nav {
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #55697b;
        flex-direction: column;
        width: 100%;
        padding: 1rem;
        transform: translateX(-110%);
        transition: transform 0.25s ease, visibility 0.25s ease;
        visibility: hidden;
        z-index: 10;
    }

    .nav.open {
        transform: translateX(0);
        visibility: visible;
    }

    .nav a {
        padding: 0.6rem 0;
    }

    .menu-toggle { display: inline-block; }

    .colorblind-menu {
        position: fixed;
        top: 56px;
        right: 8px;
        width: calc(100% - 16px);
        max-width: 300px;
        border-radius: 0.45rem;
        z-index: 110;
    }

    .colorblind-menu.open {
        display: flex;
    }
}