@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

/* Dark theme (default) */
:root {
    --radius: 16px;
    --transition: 0.3s ease;
    --bg: #0d1117;
    --card-bg: #161b22;
    --accent: #58a6ff;
    --text: #c9d1d9;
    --border: rgba(255, 255, 255, 0.1);
    --shadow: rgba(0, 0, 0, 0.3);
}

/* Light theme */
[data-theme="light"] {
    --bg: #f5f7fa;
    --card-bg: #ffffff;
    --accent: #2563eb;
    --text: #1f2937;
    --border: rgba(0, 0, 0, 0.1);
    --shadow: rgba(0, 0, 0, 0.1);
}

/* Auto theme based on system preference */
@media (prefers-color-scheme: light) {
    :root:not([data-theme]) {
        --bg: #f5f7fa;
        --card-bg: #ffffff;
        --accent: #2563eb;
        --text: #1f2937;
        --border: rgba(0, 0, 0, 0.1);
        --shadow: rgba(0, 0, 0, 0.1);
    }
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem 1rem;
    overflow-x: hidden;
    transition: background-color var(--transition), color var(--transition);
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Scroll Animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
    will-change: opacity, transform;
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    transition: opacity 0.6s ease-out, transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.category-title.animate-on-scroll {
    transition: opacity 0.4s ease-out, transform 0.4s ease-out, color var(--transition), border-bottom-color var(--transition);
}

.category-title.animate-on-scroll.is-visible {
    transition: opacity 0.6s ease-out, transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275), color var(--transition), border-bottom-color var(--transition);
}

a.animate-on-scroll {
    transition: opacity 0.4s ease-out, transform 0.4s ease-out, background-color var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

a.animate-on-scroll.is-visible {
    transition: opacity 0.6s ease-out, transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275), background-color var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

@media (hover: hover) {
    a.animate-on-scroll.is-visible:hover {
        transform: translateY(-6px) scale(1.02);
        transition: transform 0.2s ease, background-color var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
    }
}

.library-group.animate-on-scroll {
    transition: opacity 0.4s ease-out, transform 0.4s ease-out, box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
}

.library-group.animate-on-scroll.is-visible {
    transition: opacity 0.6s ease-out, transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
}

@media (hover: hover) {
    .library-group.animate-on-scroll.is-visible:hover {
        transform: translateY(-4px) scale(1.01);
        box-shadow: 0 6px 15px var(--shadow);
        transition: transform 0.2s ease, box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
    }
}

@keyframes gradientMove {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 2rem;
    text-align: center;
    background: linear-gradient(90deg, var(--accent), #a371f7, var(--accent));
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: background var(--transition);
    animation: gradientMove 3s ease infinite;
}

h1.animate-on-scroll {
    transition: opacity 0.4s ease-out, transform 0.4s ease-out, background var(--transition);
}

h1.animate-on-scroll.is-visible {
    transition: opacity 0.6s ease-out, transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275), background var(--transition);
}

.links {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    width: 100%;
    max-width: 1080px;
    padding: 0 1rem;
}

.category {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.category-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.5rem;
    padding: 0.5rem 0;
    border-bottom: 2px solid var(--border);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: color var(--transition), border-bottom-color var(--transition);
}

.category-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
}

a {
    position: relative;
    background: var(--card-bg);
    color: var(--text);
    text-decoration: none;
    border-radius: var(--radius);
    padding: 1.2rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform var(--transition), background-color var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
    box-shadow: 0 4px 10px var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
}

@media (hover: hover) {
    a:hover {
        background: var(--accent);
        color: #fff;
        transform: translateY(-4px);
    }
}

a span:not(.oauth-badge) {
    font-size: 0.9rem;
    opacity: 0.7;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px;
    flex-shrink: 0;
    text-align: right;
    margin-left: auto;
}

.oauth-badge {
    position: absolute;
    top: 0;
    right: 0;
    font-size: 0.65rem !important;
    font-weight: 700;
    padding: 0.25rem 0.65rem;
    border-bottom-left-radius: 10px;
    background: rgba(88, 166, 255, 0.2);
    color: var(--accent);
    border-left: 1px solid rgba(88, 166, 255, 0.35);
    border-bottom: 1px solid rgba(88, 166, 255, 0.35);
    margin: 0;
    opacity: 1 !important;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    transition: all var(--transition);
}

@media (hover: hover) {
    a:hover .oauth-badge {
        background: rgba(255, 255, 255, 0.3);
        color: #fff;
        border-color: rgba(255, 255, 255, 0.5);
    }
}

.library-group {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.2rem;
    border: 1px solid var(--border);
    box-shadow: 0 4px 10px var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
}

@media (hover: hover) {
    .library-group:hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 15px var(--shadow);
    }
}

.library-group-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.library-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.library-links a {
    background: transparent;
    padding: 0.75rem 1rem;
    margin: 0;
    border: 1px solid var(--border);
    font-size: 0.95rem;
}

@media (hover: hover) {
    .library-links a:hover {
        background: var(--accent);
        border-color: var(--accent);
    }
}

.language-switcher {
    position: fixed;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 0.5rem;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: var(--radius);
    box-shadow: 0 4px 10px var(--shadow);
    z-index: 1000;
    border: 1px solid var(--border);
    transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
    animation: fadeInDown 0.6s ease-out both;
}

.theme-switcher {
    position: fixed;
    top: 1rem;
    right: calc(1rem + 140px);
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: var(--radius);
    box-shadow: 0 4px 10px var(--shadow);
    z-index: 1000;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
    animation: fadeInDown 0.6s ease-out 0.1s both;
}

.theme-switcher button {
    background: transparent;
    border: none;
    color: var(--text);
    padding: 0.5rem;
    border-radius: calc(var(--radius) - 4px);
    cursor: pointer;
    font-size: 1.2rem;
    transition: background-color var(--transition), color var(--transition), transform var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
}

@media (hover: hover) {
    .theme-switcher button:hover {
        background: var(--accent);
        color: #fff;
        transform: rotate(15deg);
    }
}

.language-switcher button {
    background: transparent;
    border: none;
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: calc(var(--radius) - 4px);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color var(--transition), color var(--transition);
    font-family: 'Inter', sans-serif;
}

@media (hover: hover) {
    .language-switcher button:hover {
        background: var(--accent);
        color: #fff;
    }
}

.language-switcher button.active {
    background: var(--accent);
    color: #fff;
}

footer {
    margin-top: 2rem;
    font-size: 0.8rem;
    opacity: 0.6;
    text-align: center;
    transition: color var(--transition);
}

@media (max-width: 768px) {
    body {
        padding: 1.5rem 0.5rem;
    }

    .language-switcher {
        top: 0.5rem;
        right: 0.5rem;
        padding: 0.4rem;
        gap: 0.4rem;
    }

    .theme-switcher {
        top: 0.5rem;
        right: calc(0.5rem + 135px);
        padding: 0.4rem;
    }

    .language-switcher button {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }

    .theme-switcher button {
        width: auto;
        height: auto;
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }

    h1 {
        font-size: 1.75rem;
        margin-bottom: 1.5rem;
    }

    .links {
        gap: 1.5rem;
        padding: 0 0.5rem;
    }

    .category-links {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .category-title {
        font-size: 1rem;
    }

    a {
        font-size: 0.95rem;
        padding: 1rem 1.2rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 1rem 0.5rem;
    }

    .language-switcher {
        top: 0.5rem;
        right: 0.5rem;
        padding: 0.3rem;
        gap: 0.3rem;
    }

    .theme-switcher {
        top: 0.5rem;
        right: calc(0.5rem + 105px);
        padding: 0.3rem;
    }

    .language-switcher button {
        padding: 0.3rem 0.6rem;
        font-size: 0.8rem;
    }

    .theme-switcher button {
        width: auto;
        height: auto;
        padding: 0.3rem 0.6rem;
        font-size: 0.8rem;
    }

    .language-switcher button {
        padding: 0.3rem 0.6rem;
        font-size: 0.8rem;
    }

    h1 {
        font-size: 1.5rem;
        margin-bottom: 1.25rem;
    }

    h2 {
        font-size: 1.2rem;
        margin-bottom: 0.5rem;
    }

    .links {
        gap: 1.25rem;
        padding: 0;
    }

    .category-links {
        gap: 0.5rem;
    }

    .category-title {
        font-size: 0.95rem;
    }

    a {
        font-size: 0.9rem;
        padding: 0.9rem 1rem;
        flex-wrap: wrap;
    }

    a span:not(.oauth-badge) {
        font-size: 0.8rem;
        width: 100%;
        max-width: 100%;
        margin-top: 0.25rem;
        text-align: left;
        margin-left: 0;
    }

    .library-group {
        padding: 1rem;
    }

    .library-group-title {
        font-size: 0.95rem;
        margin-bottom: 0.5rem;
    }

    .library-links a {
        padding: 0.6rem 0.8rem;
        font-size: 0.9rem;
    }

    footer {
        font-size: 0.75rem;
        margin-top: 1.5rem;
    }
}

@media (max-width: 360px) {
    h1 {
        font-size: 1.3rem;
    }

    a {
        font-size: 0.85rem;
        padding: 0.8rem;
    }

    .language-switcher {
        padding: 0.25rem;
        gap: 0.25rem;
    }

    .theme-switcher {
        right: calc(0.5rem + 100px);
        padding: 0.25rem;
    }

    .language-switcher button {
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
    }

    .theme-switcher button {
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
    }
}