/* ============================================================
   Components — 合乎周礼

   Buttons, toggles, selectors — all interactive elements.
   ============================================================ */

/* ── Mode Toggle (iOS-style segmented control) ─────────── */
.mode-toggle {
    display: inline-flex;
    background: var(--color-bg-secondary);
    border: var(--border-thin);
    border-radius: var(--radius-full);
    padding: 3px;
    position: relative;
}

.mode-toggle-btn {
    position: relative;
    z-index: 1;
    padding: var(--space-2) var(--space-6);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-text-secondary);
    transition: color var(--transition-base);
    font-family: var(--font-serif-cn);
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.mode-toggle-btn.active {
    color: var(--color-white);
}

/* The sliding background pill */
.mode-toggle::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: calc(50% - 3px);
    height: calc(100% - 6px);
    background: var(--color-accent);
    border-radius: var(--radius-full);
    transition: transform var(--transition-base);
    z-index: 0;
    box-shadow: var(--shadow-sm);
}

.mode-toggle[data-mode="归言"]::after {
    transform: translateX(100%);
}

/* ── Mode Description ──────────────────────────────────── */
.mode-description {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    font-family: var(--font-serif-cn);
    letter-spacing: 0.03em;
    transition: opacity var(--transition-base);
}

/* ── Pill Buttons (tone & length selectors) ────────────── */
.pill {
    padding: var(--space-1) var(--space-4);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    background: transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-serif-cn);
    letter-spacing: 0.03em;
    user-select: none;
    white-space: nowrap;
}

.pill:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-border);
}

.pill.active {
    background: var(--color-accent-light);
    border-color: var(--color-accent);
    color: var(--color-text-primary);
    font-weight: var(--weight-medium);
}

.pill.auto-pill {
    font-style: italic;
    border-style: dashed;
}

.pill.auto-pill.active {
    border-style: solid;
    font-style: normal;
}

/* ── Primary Button ────────────────────────────────────── */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-width: 160px;
    padding: var(--space-3) var(--space-10);
    background: var(--color-accent);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--text-lg);
    font-weight: var(--weight-medium);
    font-family: var(--font-serif-cn);
    letter-spacing: 0.06em;
    cursor: pointer;
    transition: background var(--transition-fast),
                transform var(--transition-fast),
                box-shadow var(--transition-fast),
                opacity var(--transition-fast);
    box-shadow: var(--shadow-sm);
    user-select: none;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-primary:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ── Pulse Dot (loading indicator) ─────────────────────── */
.pulse-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-accent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.pulse-dot.active {
    opacity: 1;
    animation: pulse-dot-anim 1.6s ease-in-out infinite;
}

/* ── Ink Drop Loading ──────────────────────────────────── */
.ink-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
}

.ink-drop {
    width: 24px;
    height: 24px;
    position: relative;
}

.ink-drop::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
    animation: ink-ripple 2s ease-out infinite;
}

.ink-drop::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
    animation: ink-ripple 2s ease-out 0.6s infinite;
}

.ink-loading-text {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    font-family: var(--font-serif-cn);
    letter-spacing: 0.06em;
    transition: opacity 0.3s ease;
}

/* ── Shimmer ───────────────────────────────────────────── */
.shimmer {
    background: linear-gradient(
        90deg,
        var(--color-bg-secondary) 0%,
        var(--color-accent-subtle) 50%,
        var(--color-bg-secondary) 100%
    );
    background-size: 200% 100%;
    animation: shimmer-anim 2.4s ease-in-out infinite;
}