:root {
    --max-width: 1000px;

    --bg: #f6f6f6;
    --surface: #1e1b2f;
    --text: #ffffff;
    --muted: #cccccc;

    --accent-blue: #0869d1;
    --accent-blue-dark: #2367af;
    --accent-purple: #a86aff;

    --card-bg: rgba(30, 27, 47, 0.92);
    --card-border: rgba(255, 255, 255, 0.1);
    --panel-bg: rgba(28, 24, 44, 0.85);
}

* {
    box-sizing: border-box;
}

html, body {
    min-height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
    font-family: 'Inter', system-ui, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    scroll-behavior: smooth;
}

main { flex: 1; }

.wrap { max-width: var(--max-width); margin: 0 auto; padding: 2rem 1rem; }

.site-header {
    background: linear-gradient(135deg, #1e1b2f 0%, #4a3b70 50%, #1a1a33 100%);
    color: var(--text);
    padding: 2rem 1rem;
    border-radius: 0 0 16px 16px;
    text-align: center;
    box-shadow: 0 8px 20px rgba(77, 163, 255, 0.2);
}

.brand { margin:0; font-size: 2.5rem; font-weight: 700; letter-spacing: 1px; }
.subtitle { margin:0.5rem 0 1.5rem 0; font-weight: 400; font-size: 1.1rem; color: #ffffff; }

.main-nav {
    list-style: none; display: none; gap: 2rem; justify-content: center; padding:0; flex-wrap: wrap;
}
.main-nav button {
    background: none; border: none; color: var(--text); font-weight: 600; font-size: 1rem;
    cursor: pointer; padding: 0.5rem 0; position: relative; transition: color 0.3s ease;
}
.main-nav button[aria-selected="true"]::after {
    content: ''; position: absolute; bottom: -6px; left: 50%;
    transform: translateX(-50%); width: 40%; height: 3px;
    background: var(--accent-blue); border-radius: 2px;
}
.main-nav button:hover { color: var(--accent-blue-dark); }

.card-list {
    display: grid;
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: #ffffff;
    padding: 1.5rem;
    border-radius: 16px;
    backdrop-filter: blur(6px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 28px rgba(0,0,0,0.5);
    border-color: var(--accent-purple);
}

#meaning { color: #000000; }

.card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 12px;
    margin-top: 1rem;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
    transition: transform 0.3s ease;
}

#meaning img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 12px;
    border: 1px solid rgba(0,0,0,0.1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
    transition: transform 0.3s ease;
}

img:hover { transform: scale(1.02); }

figure { margin: 2rem 0; text-align: center; }
figcaption { font-size: 0.95rem; color: var(--muted); margin-top: 0.5rem; }

.site-footer {
    background: linear-gradient(135deg, #1a1a33 0%, #4a3b70 50%, #1e1b2f 100%);
    color: var(--muted);
    text-align: center;
    padding: 2rem 1rem;
    border-radius: 16px 16px 0 0;
    margin-top: 2rem;
    box-shadow: 0 -8px 20px rgba(77, 163, 255, 0.2);
}

:focus { outline: 3px solid var(--accent-blue-dark); outline-offset: 3px; }

h2 { font-size: 2rem; font-weight: 700; margin-bottom: 1rem; color: var(--accent-blue-dark); }
h2:nth-of-type(2) { color: var(--accent-blue); }
h2:nth-of-type(3) { color: var(--accent-purple); }

h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--accent-blue-dark); }

#forms .card-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    align-items: stretch;
}

#forms .card-list .card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

#forms .card-list .card img {
    flex-shrink: 0;
}

.js-enabled .main-nav {
    display: flex;
}

.js-enabled .js-tab-panel[aria-hidden="true"] {
    display: none;
}

.js-enabled .js-tab-panel[aria-hidden="false"] {
    display: block;
}

/*
mobile
 */
@media (max-width: 599px) {
    .site-header {
        padding: 1.5rem 1rem;
        border-radius: 0;
    }
    .brand {
        font-size: 2rem;
    }
    .subtitle {
        font-size: 1rem;
    }
    .main-nav {
        gap: 1rem;
    }
    .card-list {
        grid-template-columns: 1fr;
    }
    #meaning img {
        height: 260px;
    }
}

/*
tablet
 */
@media (min-width: 600px) and (max-width: 1023px) {
    .brand {
        font-size: 2.2rem;
    }
    .card-list {
        grid-template-columns: repeat(2, 1fr);
    }
    #meaning img {
        height: 340px;
    }
}

/*
netbook
 */
@media (min-width: 1024px) and (max-width: 1279px) {
    .wrap {
        padding: 2.5rem 1.5rem;
    }
    .brand {
        font-size: 2.3rem;
    }
    .card-list {
        grid-template-columns: repeat(2, 1fr);
    }
    #meaning img {
        height: 360px;
    }
    .main-nav {
        gap: 1.5rem;
    }
}


/*
desktop
 */
@media (min-width: 1280px) {
    .wrap {
        padding: 3rem 2rem;
    }
    .card-list {
        grid-template-columns: repeat(2, 1fr);
    }
    #meaning img {
        height: 420px;
    }
}