/* Root theme tokens */
:root {
    --color-bg: #f9fafb;
    --color-bg-elevated: #ffffff;
    --color-bg-navbar: rgba(15, 23, 42, 0.96);
    --color-border-subtle: #e5e7eb;
    --color-border-strong: #cbd5f5;
    --color-text: #020617;
    --color-text-muted: #6b7280;
    --color-accent: #2563eb;
    --color-accent-soft: #dbeafe;
    --color-accent-strong: #1d4ed8;
    --color-input-bg: #ffffff;
    --color-input-border: #d1d5db;
    --color-shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.08);
    --color-navbar-title: #f9fafb;
}

body.dark-mode {
    --color-bg: #020617;
    --color-bg-elevated: #020617;
    --color-bg-navbar: rgba(15, 23, 42, 0.96);
    --color-border-subtle: #1f2937;
    --color-border-strong: #1f2937;
    --color-text: #e5e7eb;
    --color-text-muted: #9ca3af;
    --color-accent: #38bdf8;
    --color-accent-soft: rgba(56, 189, 248, 0.12);
    --color-accent-strong: #0ea5e9;
    --color-input-bg: #020617;
    --color-input-border: #1f2937;
    --color-shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.85);
    --color-navbar-title: #f9fafb;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 18px;
    background: var(--color-bg);
    color: var(--color-text);
    transition: background-color 0.3s ease, color 0.3s ease;
}

main {
    padding: 2rem 1.5rem;
    max-width: 1325px;
    margin: 0 auto;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--color-accent);
    color: #ffffff;
    border-radius: 0.375rem;
    z-index: 50;
}

.skip-link:focus {
    left: 0.75rem;
}

.app-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem 1.5rem;
    background: var(--color-bg-navbar);
    border-bottom: 1px solid var(--color-border-subtle);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar__brand {
    display: flex;
    flex-direction: column;
}

.navbar__title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-navbar-title);
}

.navbar__subtitle {
    font-size: 1rem;
    color: var(--color-text-muted);
}

.navbar__right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-link {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    text-decoration: none;
}

.nav-link:hover {
    color: var(--color-text);
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 1rem;
}

.theme-toggle-label {
    color: var(--color-text-muted);
}

.theme-switch {
    position: relative;
    width: 40px;
    height: 20px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-switch input:focus-visible + .slider {
    box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border-subtle);
    transition: 0.3s;
    border-radius: 999px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: var(--color-bg-navbar);
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--color-accent);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

.main-content {
    flex: 1;
    padding: 4.5rem 1.5rem 1.5em
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .container {
        grid-template-columns: minmax(0, 1fr);
    }
}

.panel {
    background: var(--color-bg-elevated);
    border-radius: 0.75rem;
    padding: 1.1rem 1.1rem 1rem;
    box-shadow: var(--color-shadow-soft);
    border: 1px solid var(--color-border-subtle);
}

.panel h2 {
    margin-top: 0;
    margin-bottom: 0.6rem;
    font-size: 1.2rem;
    font-weight: 600;
}

.panel p.subtitle {
    margin-top: 0;
    margin-bottom: 0.8rem;
    font-size: 1rem;
    color: var(--color-text-muted);
}

textarea {
    width: 95%;
    padding: 0.7rem 0.75rem;
    border-radius: 0.5rem;
    border: 1px solid var(--color-input-border);
    background: var(--color-input-bg);
    color: var(--color-text);
    font-family: inherit;
    font-size: 1.125rem;
    resize: vertical;
    min-height: 180px;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 1px var(--color-accent-soft);
}

button:focus-visible,
textarea:focus-visible,
input[type="radio"]:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.case-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    /* grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); */
    gap: 0.45rem 0.9rem;
    padding: 20px 25px;
    margin-top: 0.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--color-input-border);
}

.case-options label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 1rem;
    color: var(--color-text);
}

.case-options input[type="radio"] {
    accent-color: var(--color-accent);
}

.result-section textarea {
    min-height: 200px;
    background: var(--color-input-bg);
}

.statistics {
    display: flex;
    gap: 1rem;
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-top: 0.3rem;
}

.statistics span {
    color: var(--color-text);
    font-weight: 500;
}

.actions {
    margin-top: 0.9rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

button {
    padding: 0.55rem 0.9rem;
    border-radius: 999px;
    border: 1px solid var(--color-border-subtle);
    background: var(--color-input-bg);
    color: var(--color-text);
    font-size: 1.05rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
}

button:hover {
    background: var(--color-accent);
    border-color: var(--color-accent-strong);
    color: #f9fafb;
}

button:active {
    transform: translateY(1px);
}

/* Panels and inputs automatically adapt via CSS variables in dark mode */

table {
    border-collapse: collapse;
    width: 100%;
    max-width: 1023px;
    background: var(--color-bg-elevated);
    border-radius: 0.5rem;
    overflow: hidden;
}

table a {
    color: var(--color-text);
    text-decoration: none;
}

table a:hover {
    color: var(--color-accent);
}

th,
td {
    border-bottom: 1px solid var(--color-border-subtle);
    padding: 0.6rem 0.8rem;
    font-size: 0.9rem;
    color: var(--color-text);
}

th {
    text-align: left;
    background: var(--color-bg);
    position: sticky;
    top: 0;
}

tr:nth-child(even) td,
tr:nth-child(odd) td {
    background: var(--color-bg-elevated);
}

code {
    background: var(--color-input-bg);
    padding: 0.15rem 0.35rem;
    border-radius: 0.25rem;
}

.sample {
    margin-bottom: 0.8rem;
}

#sample-input {
    display: inline-block;
    min-width: 260px;
    max-width: 736px;
    width: 100%;
    padding: 0.35rem 0.5rem;
    border-radius: 0.4rem;
    border: 1px solid var(--color-input-border);
    background: var(--color-input-bg);
    color: var(--color-text);
    font-size: 1rem;
}

#sample-input:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.note {
    margin-top: 1.5rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.case-style-article {
    margin-top: 2rem;
    line-height: 1.7;
}

.case-style-article h2 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

.case-style-article h3 {
    font-size: 1.15rem;
    margin-top: 1.5rem;
    margin-bottom: 0.4rem;
}

.case-style-article p {
    margin: 0.2rem 0 0.8rem;
}

.case-style-article a {
    color: var(--color-accent-strong);
    text-decoration: underline;
}

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

.site-footer {
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border-subtle);
    background: var(--color-bg-elevated);
}