@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&family=Open+Sans:ital,wght@0,300..800;1,300..800&family=Roboto:ital,wght@0,100..900;1,100..900&display=swap');

:root[data-theme="dark"] {
    --bg-color: #333;
    --text-color: #fff;
    --link-color: #ddd;
    --nav-bg: #2b2b2b;
    --nav-btn-bg: #3a3a3a;
    --nav-btn-hover-bg: #474747;
    --nav-btn-border: #555;
    --nav-btn-hover-border: #666;
    --toggle-track: #4a4a4a;
    --toggle-knob: #f4f4f4;
    --toggle-icon-color: #f5f5f5;
}

:root[data-theme="light"] {
    --bg-color: #fff;
    --text-color: #333;
    --link-color: #007acc;
    --nav-bg: #f0f0f0;
    --nav-btn-bg: #e0e0e0;
    --nav-btn-hover-bg: #d0d0d0;
    --nav-btn-border: #ccc;
    --nav-btn-hover-border: #bbb;
    --toggle-track: #d3d3d3;
    --toggle-knob: #ffffff;
    --toggle-icon-color: #444;
}

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

body {
    margin: 0;
    min-height: 100vh;
    min-height: 100dvh;
    font-family: "Georgia", "Times New Roman", serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;

    /* Smooth Theme Transition */
    transition: background-color 0.25s ease, color 0.25s ease
}

html {
    background-color: var(--bg-color);
    color: var(--text-color);

    /* Smooth Theme Transition */
    transition: background-color 0.25s ease, color 0.25s ease
}

.page-header {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

header {
    position: sticky;
    top: 0;
    z-index: 1;
    width: 100%;
    padding: 0;
}

footer {
    text-align: center;
    padding: 20px 10px;
    background: var(--nav-bg);
    color: var(--text-color);
    font-size: 0.9rem;

    /* Smooth Theme Transition */
    transition: background-color 0.25s ease, color 0.25s ease;
}

main {
    flex: 1;
}

.page-footer {
    margin-top: auto;
}

.page-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-top: 12px;
    margin-bottom: 8px;
    color: var(--text-color);

    /* Smooth Theme Transition */
    transition: color 0.25s ease;

    /* left side with padding */
    text-align: left;
    padding-left: 23px;
}

.page-paragraph {
    font-size: 1rem;
    line-height: 1.3;
    margin-bottom: 8px;
    color: var(--text-color);

    /* Smooth Theme Transition */
    transition: color 0.25s ease;

    /* left side with padding */
    text-align: left;
    padding-left: 23px;
}

.page-link {
    color: var(--link-color);
    text-decoration: underline;
    font-weight: 500;

    /* Smooth Theme Transition */
    transition: color 0.25s ease;
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
    margin: 0;
    padding: 10px 14px;
    /*border: 1px solid #444;
    border-radius: 10px;*/
    background: var(--nav-bg);

    /* Smooth Theme Transition */
    transition: background-color 0.25s ease, color 0.25s ease;
}

.page-title-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
}

.page-search-container {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-right: 23px;
}

.page-input {
    padding: 8px 10px;
    border: 1px solid var(--nav-btn-border);
    border-radius: 4px;
    background: var(--nav-btn-bg);
    color: var(--text-color);
    font-size: 0.92rem;
    font-family: inherit;

    /* Smooth Theme Transition */
    transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.nav-left,
.nav-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-title {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0px 4px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;

    /* Smooth Theme Transition */
    transition: color 0.25s ease;
}

.nav-right {
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav-btn, .page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 0.45rem 0.8rem;
    border: 1px solid var(--nav-btn-border);
    border-radius: 4px;
    background: var(--nav-btn-bg);
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 500;
    line-height: 1.1;
    font-family: inherit;

    /* Smooth Theme Transition */
    transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.nav-btn:hover,
.nav-btn:focus-visible {
    background: var(--nav-btn-hover-bg);
    border-color: var(--nav-btn-hover-border);
    outline: none;
}

@media (max-width: 720px) {
    header {
        padding: 6px 8px;
    }

    nav {
        width: 100%;
        padding: 10px 12px;
        flex-direction: column;
        align-items: stretch;
    }

    .nav-left,
    .nav-right {
        justify-content: center;
    }

    .nav-right {
        gap: 10px;
    }
}

/* ── Theme toggle button ── */

.toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 36px;
    padding: 4px 8px 4px 4px;
    border: 1px solid var(--nav-btn-border);
    border-radius: 20px;
    background: var(--nav-btn-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.toggle-btn:hover,
.toggle-btn:focus-visible {
    background: var(--nav-btn-hover-bg);
    border-color: var(--nav-btn-hover-border);
    outline: none;
}

.toggle-btn .track {
    width: 44px;
    height: 24px;
    border-radius: 12px;
    background: var(--toggle-track);
    position: relative;
    transition: background-color 0.25s ease;
    flex-shrink: 0;
}

.toggle-btn .knob {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--toggle-knob);
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), background-color 0.25s ease;
}

[data-theme="dark"] .toggle-btn .knob {
    transform: translateX(20px);
}

.toggle-btn .toggle-icon {
    font-size: 0.95rem;
    line-height: 1;
    color: var(--toggle-icon-color);
    width: 1.1em;
    text-align: center;
    transition: color 0.25s ease;
}

/* Entry cards */
.entry-container, #entry-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 20px;
    max-width: 1000px;
    margin: 0 auto;
}

.entry-card {
    border: 1px solid var(--nav-btn-border);
    border-radius: 8px;
    padding: 16px;
    background: var(--nav-btn-bg);
    color: var(--text-color);
    transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.entry-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.entry-definition {
    font-size: 0.8rem;
    margin-bottom: 4px;
}

.entry-example {
    margin-top: 8px;
    font-size: 0.75rem;
    font-style: italic;
}