* {
    user-select: none;
}

:root {
    --accent: #5a9db5;
    --bg: #2a2a2a;
    --bg-nav: #222222;
    --bg-hover: #323232;
    --bg-selected: #1e2a32;
    --border: #383838;
    --text: #aaaaaa;
    --text-dim: #505050;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: 'Lucida Grande', sans-serif;
}

#navbar {
    display: flex;
    align-items: center;
    background: var(--bg-nav);
    border-bottom: 1px solid var(--border);
    padding: 0 16px;
    height: 44px;
}

#logo-icon {
    color: var(--accent);
    font-size: 22px;
    margin-right: 24px;
}

#nav-tabs {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    height: 100%;
    flex: 1;
}

#nav-right {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    height: 100%;
    gap: 4px;
}

#nav-tabs li,
#nav-right li {
    display: flex;
}

#nav-logo a, a {
    text-decoration: none;
}

.tab {
    display: flex;
    align-items: center;
    padding: 0 16px;
    color: var(--accent);
    font-size: 13px;
    letter-spacing: 0.05em;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    text-decoration: none;
    transition: background 0.15s ease;
}

.tab:hover {
    background: var(--bg-hover);
}

.tab.active {
    border-bottom: 2px solid var(--accent);
}

#nav-right .tab {
    padding: 0 10px;
    color: var(--text-dim);
    font-size: 12px;
}

#nav-right .tab:hover {
    color: var(--text);
}

#content {
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

#grid-header {
    text-align: left;
}

#grid-title {
    margin: 0 0 4px;
    font-size: 16px;
    font-weight: normal;
    color: var(--text);
    letter-spacing: 0.08em;
}

#grid-instructions {
    color: var(--text-dim);
    font-size: 12px;
    letter-spacing: 0.03em;
    margin: 0;
}

#grid-instructions span {
    color: var(--text);
}

.inline-link {
    color: var(--accent);
    display: inline;
    padding: 0;
    border: none;
    font-size: 12px;
}

#grid-panel {
    background: var(--bg-nav);
    border: 1px solid var(--border);
    padding: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

#kana-grid-container {
    background: var(--bg-nav);
    border: 1px solid var(--accent);
    padding: 0;
    width: fit-content;
    user-select: none;
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

#kana-grid {
    display: flex;
    flex-direction: row;
    gap: 0;
}

.kana-col {
    display: flex;
    flex-direction: column;
    flex: none;
    width: 52px;
    border-left: 1px solid var(--border);
    cursor: pointer;
    transition: background 0.2s ease;
    box-sizing: border-box;
}

.kana-col:first-child {
    border-left: none;
}

.kana-col:hover:not(.selected) {
    background: var(--bg-hover);
    transition: background 0.05s ease;
}

.kana-col.selected {
    background: var(--bg-selected);
    border-left-color: var(--accent);
}

.kana-col.selected + .kana-col {
    border-left-color: var(--accent);
}

.kana-col.selected + .kana-col.selected {
    border-left-color: var(--accent);
}

.kana-col.selected:hover {
    background: #243040;
}

.kana-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 56px;
    flex-shrink: 0;
    padding: 0 4px;
    gap: 4px;
    box-sizing: border-box;
}

.kana-cell.empty {
    height: 56px;
    flex-shrink: 0;
    visibility: hidden;
}

.kana {
    font-size: 22px;
    color: var(--accent);
    line-height: 1;
}

.romaji {
    font-size: 9px;
    color: var(--text-dim);
    letter-spacing: 0.02em;
    text-align: center;
    white-space: nowrap;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
}

#study-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: calc(100vh - 44px);
    gap: 40px;
    width: 100%;
    position: fixed;
    top: 44px;
    left: 0;
}

#study-tracker {
    position: fixed;
    top: 56px;
    left: 16px;
    font-size: 12px;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

#study-kana {
    font-size: 96px;
    color: var(--accent);
    line-height: 1;
}

#study-feedback {
    font-size: 14px;
    height: 20px;
    letter-spacing: 0.05em;
}

.feedback-wrong {
    color: var(--accent);
}

#study-input {
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    font-size: 20px;
    font-family: 'Lucida Grande', sans-serif;
    text-align: center;
    width: 200px;
    outline: none;
    padding: 8px 0;
}

#study-input:focus {
    border-bottom-color: var(--accent);
}

#study-complete {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: calc(100vh - 44px);
    gap: 16px;
    width: 100%;
}

#complete-title {
    font-size: 24px;
    letter-spacing: 0.08em;
}

.complete-highscore {
    color: var(--accent);
}

.complete-normal {
    color: var(--text);
}

#complete-time {
    font-size: 14px;
    color: var(--text);
}

#complete-best {
    font-size: 12px;
    color: var(--text-dim);
}

.tracker-best {
    color: var(--accent);
}

#complete-retry {
    margin-top: 16px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--accent);
    font-family: 'Lucida Grande', sans-serif;
    font-size: 13px;
    padding: 8px 24px;
    cursor: pointer;
    letter-spacing: 0.05em;
    transition: border-color 0.15s ease, background 0.15s ease;
}

#complete-retry:hover {
    border-color: var(--accent);
    background: var(--bg-hover);
}

#about-text {
    color: var(--text-dim);
    font-size: 13px;
    margin: 0;
    line-height: 1.7;
}

#contact-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 320px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group input,
.form-group textarea {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: 'Lucida Grande', sans-serif;
    font-size: 13px;
    padding: 10px 12px;
    outline: none;
    box-sizing: border-box;
    resize: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-dim);
}

#contact-form button {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--accent);
    font-family: 'Lucida Grande', sans-serif;
    font-size: 13px;
    padding: 10px;
    cursor: pointer;
    letter-spacing: 0.05em;
    transition: border-color 0.15s ease, background 0.15s ease;
    width: 100%;
}

#contact-form button:hover {
    border-color: var(--accent);
    background: var(--bg-hover);
}

#form-success {
    color: var(--text-dim);
    font-size: 13px;
    margin: 0;
}

.contact-panel {
    width: 480px;
}

.contact-panel #contact-form {
    width: 100%;
}

@media (max-width: 600px) {
    #kana-grid {
        flex-wrap: wrap;
        justify-content: center;
    }

    .kana-col {
        width: clamp(44px, 18vw, 56px);
    }
}