:root {
    --zb-bg: #f7f4fb;
    --zb-surface: #ffffff;
    --zb-text: #2a2438;
    --zb-muted: #746e85;
    --zb-border: #e4dff0;
    --zb-accent: #6d4fc2;

    --zb-known-bg: #e3f3e6;
    --zb-known-text: #2f6b3d;

    --zb-learning-bg: #fdead9;
    --zb-learning-text: #9a5b1d;

    --zb-rare-bg: #ece3f5;
    --zb-rare-text: #5b3d8a;

    --zb-seen-bg: #fbf5da;
    --zb-seen-text: #8a6d1d;

    --zb-none-bg: #eeecf3;
    --zb-none-text: #746e85;
}

* {
    box-sizing: border-box;
}

/* Author rules like ".reader-area { display: flex }" or
   ".word-panel-overlay { display: flex }" below would otherwise beat
   the browser's default [hidden] styling, leaving elements toggled via
   el.hidden = true/false visible (and, for the fixed full-screen
   overlay, silently blocking clicks on everything behind it). */
[hidden] {
    display: none !important;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        sans-serif;
    background: var(--zb-bg);
    color: var(--zb-text);
}

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

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--zb-surface);
    border-bottom: 1px solid var(--zb-border);
}

.topbar-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

.topbar-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--zb-accent);
    color: #fff;
    font-size: 14px;
}

.open-book-button {
    padding: 8px 14px;
    border-radius: 999px;
    background: var(--zb-accent);
    color: #fff;
    font-size: 14px;
    cursor: pointer;
    white-space: nowrap;
}

.topbar-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.font-size-controls {
    display: flex;
    border: 1px solid var(--zb-border);
    border-radius: 999px;
    overflow: hidden;
}

.font-size-controls button {
    border: none;
    background: var(--zb-bg);
    color: var(--zb-text);
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
}

.font-size-controls button:first-child {
    border-right: 1px solid var(--zb-border);
}

.icon-button {
    border: 1px solid var(--zb-border);
    background: var(--zb-bg);
    color: var(--zb-text);
    border-radius: 999px;
    width: 36px;
    height: 36px;
    font-size: 16px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.empty-state {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    text-align: center;
    color: var(--zb-muted);
}

.reader-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.viewer {
    flex: 1;
    min-height: 0;
    background: var(--zb-surface);
}

.reader-nav {
    display: flex;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--zb-surface);
    border-top: 1px solid var(--zb-border);
}

.reader-nav button {
    padding: 8px 20px;
    border: 1px solid var(--zb-border);
    border-radius: 8px;
    background: var(--zb-bg);
    font-size: 16px;
    color: var(--zb-text);
}

.word-panel-overlay {
    position: fixed;
    inset: 0;
    background: rgba(20, 15, 35, 0.35);
    display: flex;
    align-items: flex-end;
    z-index: 50;
}

.word-panel {
    position: relative;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    background: var(--zb-surface);
    border-radius: 16px 16px 0 0;
    padding: 20px 18px calc(20px + env(safe-area-inset-bottom));
}

.word-panel-close {
    position: absolute;
    top: 10px;
    right: 14px;
    border: none;
    background: none;
    font-size: 22px;
    line-height: 1;
    color: var(--zb-muted);
    cursor: pointer;
}

.wp-word {
    font-size: 22px;
    font-weight: 700;
    margin: 0 0 2px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.wp-form-speak {
    border: 1px solid var(--zb-border);
    background: var(--zb-bg);
    border-radius: 999px;
    padding: 2px 8px;
    font-size: 13px;
    cursor: pointer;
    line-height: 1.6;
}

.wp-word-speak {
    font-size: 15px;
}

.wp-pos-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    background: var(--zb-none-bg);
    color: var(--zb-text);
    text-transform: uppercase;
}

.wp-sense {
    border-top: 1px solid var(--zb-border);
    padding-top: 14px;
    margin-top: 14px;
}

.wp-sense:first-of-type {
    border-top: none;
    padding-top: 0;
    margin-top: 4px;
}

.wp-sense-header {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.wp-sense-count {
    font-size: 12px;
    color: var(--zb-muted);
}

.wp-irregular-forms {
    background: var(--zb-none-bg);
    border-radius: 10px;
    padding: 10px 12px;
}

.wp-form-group {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 6px;
}

.wp-form-group-label {
    font-size: 12px;
    color: var(--zb-muted);
    min-width: 92px;
}

.wp-form-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
}

.wp-surface-note {
    font-size: 13px;
    color: var(--zb-muted);
    margin: 0 0 10px;
}

.wp-status-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 12px;
}

.wp-status-known {
    background: var(--zb-known-bg);
    color: var(--zb-known-text);
}

.wp-status-learning {
    background: var(--zb-learning-bg);
    color: var(--zb-learning-text);
}

.wp-status-rare {
    background: var(--zb-rare-bg);
    color: var(--zb-rare-text);
}

.wp-status-seen {
    background: var(--zb-seen-bg);
    color: var(--zb-seen-text);
}

.wp-status-none {
    background: var(--zb-none-bg);
    color: var(--zb-none-text);
}

.wp-image {
    width: 100%;
    max-width: 260px;
    border-radius: 12px;
    margin: 4px 0 14px;
    display: block;
    background: var(--zb-bg);
}

.wp-row {
    margin: 0 0 10px;
    line-height: 1.4;
}

.wp-label {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--zb-muted);
    margin-bottom: 2px;
}

.wp-pronunciation-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.wp-speak-button {
    border: 1px solid var(--zb-border);
    background: var(--zb-bg);
    border-radius: 999px;
    padding: 4px 10px;
    font-size: 13px;
    cursor: pointer;
}

.wp-actions {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.wp-action-button {
    flex: 1;
    min-width: 130px;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--zb-border);
    background: var(--zb-bg);
    font-size: 14px;
    color: var(--zb-text);
    cursor: pointer;
}

.wp-action-button.active {
    border-color: transparent;
}

.wp-action-button.active.learning {
    background: var(--zb-learning-bg);
    color: var(--zb-learning-text);
}

.wp-action-button.active.known {
    background: var(--zb-known-bg);
    color: var(--zb-known-text);
}

.wp-new-word-note {
    background: var(--zb-none-bg);
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 13px;
    color: var(--zb-text);
    margin-bottom: 12px;
}

.wp-pending-note {
    font-size: 13px;
    color: var(--zb-known-text);
    margin-top: 10px;
}

.toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    background: #2a2438;
    color: #fff;
    padding: 10px 16px;
    border-radius: 999px;
    font-size: 13px;
    z-index: 100;
}

.debug-log {
    position: fixed;
    left: 8px;
    right: 8px;
    top: 60px;
    max-height: 22vh;
    overflow-y: auto;
    background: rgba(0, 0, 0, 0.85);
    color: #7CFC00;
    font-family: monospace;
    font-size: 11px;
    padding: 8px;
    border-radius: 8px;
    z-index: 200;
    white-space: pre-wrap;
    /* Read-only: must never intercept taps meant for the page below it
       (word taps, page-turn buttons, swipes) -- it sat over the nav
       buttons at the bottom of the screen and blocked them. */
    pointer-events: none;
}

/* Dark palette applies automatically from system preference, unless the
   theme toggle button has set an explicit choice (data-theme on <html>),
   in which case that choice always wins in either direction. */

@media (prefers-color-scheme: dark) {

    :root:not([data-theme="light"]) {
        --zb-bg: #16121f;
        --zb-surface: #211c2e;
        --zb-text: #ece9f2;
        --zb-muted: #a49bb8;
        --zb-border: #352c46;

        --zb-known-bg: #203a27;
        --zb-known-text: #8fd6a0;

        --zb-learning-bg: #402c17;
        --zb-learning-text: #eab377;

        --zb-rare-bg: #322546;
        --zb-rare-text: #c6aeee;

        --zb-seen-bg: #3a331a;
        --zb-seen-text: #e3cd7c;

        --zb-none-bg: #2a2438;
        --zb-none-text: #a49bb8;
    }

}

:root[data-theme="dark"] {
    --zb-bg: #16121f;
    --zb-surface: #211c2e;
    --zb-text: #ece9f2;
    --zb-muted: #a49bb8;
    --zb-border: #352c46;

    --zb-known-bg: #203a27;
    --zb-known-text: #8fd6a0;

    --zb-learning-bg: #402c17;
    --zb-learning-text: #eab377;

    --zb-rare-bg: #322546;
    --zb-rare-text: #c6aeee;

    --zb-seen-bg: #3a331a;
    --zb-seen-text: #e3cd7c;

    --zb-none-bg: #2a2438;
    --zb-none-text: #a49bb8;
}