/* Chatbot Design System */
:root {
    --brand-color-primary: oklch(65% 0.18 260);
    --brand-color-secondary: oklch(55% 0.2 260);
    --brand-color-accent: oklch(75% 0.15 260);
    
    --cb-bg: oklch(98% 0.01 260);
    --cb-surface: oklch(100% 0 0);
    --cb-text: oklch(25% 0.02 260);
    --cb-text-dim: oklch(45% 0.02 260);
    --cb-border: oklch(92% 0.02 260);
    --cb-msg-self: var(--brand-color-primary);
    --cb-msg-other: oklch(94% 0.01 260);
    --cb-shadow: 0 10px 40px -10px oklch(20% 0.05 260 / 15%);
    --cb-shadow-sm: 0 4px 12px -2px oklch(20% 0.05 260 / 10%);
}

.cb-widget {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 10000;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--cb-text);
}

.cb-toggle-btn {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: var(--brand-color-primary);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: var(--cb-shadow-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.cb-toggle-btn:hover {
    transform: translateY(-2px);
    background: var(--brand-color-secondary);
    box-shadow: var(--cb-shadow);
}

.cb-toggle-btn:focus-visible {
    outline: 3px solid var(--brand-color-accent);
    outline-offset: 2px;
}

.cb-window {
    position: absolute;
    bottom: 72px;
    right: 0;
    width: 360px;
    max-width: calc(100vw - 48px);
    height: 600px;
    max-height: calc(100vh - 120px);
    background: var(--cb-surface);
    border-radius: 20px;
    box-shadow: var(--cb-shadow);
    display: none;
    flex-direction: column;
    overflow: hidden;
    transform-origin: bottom right;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0;
    border: 1px solid var(--cb-border);
}

.cb-window.active {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

.cb-header {
    background: var(--cb-surface);
    color: var(--cb-text);
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--cb-border);
}

.cb-header h3 {
    margin: 0;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.cb-close {
    background: var(--cb-msg-other);
    border: none;
    color: var(--cb-text-dim);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.cb-close:hover {
    background: var(--cb-border);
    color: var(--cb-text);
}

.cb-messages {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: var(--cb-bg);
}

.cb-message {
    max-width: 90%;
    display: flex;
    gap: 8px;
    align-items: flex-end;
    position: relative;
    box-shadow: 0 2px 4px oklch(0% 0 0 / 2%);
}

.cb-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    flex-shrink: 0;
    background-size: cover;
    background-position: center;
    border: 1px solid var(--cb-border);
}

.cb-message-content {
    padding: 10px 14px;
    border-radius: 14px;
    font-size: 14px;
    line-height: 1.4;
    word-wrap: break-word;
}

.cb-message-content a {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 2px;
    opacity: 0.9;
    transition: opacity 0.2s;
}

.cb-message-content a:hover {
    opacity: 1;
}

.cb-message-self .cb-message-content a {
    color: white;
}

.cb-message-self {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.cb-message-self .cb-message-content {
    background: var(--cb-msg-self);
    color: white;
    border-bottom-right-radius: 4px;
}

.cb-message-other {
    align-self: flex-start;
}

.cb-message-other .cb-message-content {
    background: var(--cb-surface);
    color: var(--cb-text);
    border-bottom-left-radius: 4px;
    border: 1px solid var(--cb-border);
}

.cb-message-meta {
    font-size: 10px;
    margin-top: 4px;
    opacity: 0.5;
    display: block;
}

.cb-message-self .cb-message-meta {
    text-align: right;
}

.cb-input-area {
    padding: 20px;
    background: var(--cb-surface);
    border-top: 1px solid var(--cb-border);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cb-input-wrapper {
    display: flex;
    gap: 12px;
}

.cb-input-footer {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.cb-char-counter {
    font-size: 11px;
    color: var(--cb-text-dim);
    transition: color 0.2s;
}

.cb-char-counter.limit-reached {
    color: oklch(60% 0.15 20);
    font-weight: 600;
}

.cb-input {
    flex: 1;
    border: 1px solid var(--cb-border);
    padding: 12px 16px;
    border-radius: 12px;
    outline: none;
    font-size: 14px;
    background: var(--cb-bg);
    transition: all 0.2s ease;
}

.cb-input:focus {
    border-color: var(--brand-color-primary);
    background: var(--cb-surface);
    box-shadow: 0 0 0 3px oklch(from var(--brand-color-primary) l c h / 15%);
}

.cb-send {
    background: var(--brand-color-primary);
    color: white;
    border: none;
    padding: 0 20px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.cb-send:hover {
    background: var(--brand-color-secondary);
}

.cb-send:focus-visible {
    outline: 3px solid var(--brand-color-accent);
    outline-offset: 2px;
}

/* ── Rate-limit Cooldown Overlay ─────────────────────────────────────────────
   Sits inside .cb-window (position: absolute), covering messages + input.
   Appears when the server returns rate_limited: true.
   Auto-dismisses when the countdown reaches zero.
   ─────────────────────────────────────────────────────────────────────────── */

.cb-cooldown-overlay {
    position: absolute;
    inset: 0;                       /* covers the entire chat window */
    z-index: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border-radius: inherit;
    animation: cb-fade-in 0.25s ease;
}

@keyframes cb-fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.cb-cooldown-card {
    background: var(--cb-surface);
    border: 1px solid var(--cb-border);
    border-radius: 16px;
    padding: 32px 28px 28px;
    width: 82%;
    max-width: 280px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    text-align: center;
    box-shadow: 0 20px 60px -10px rgba(0, 0, 0, 0.3);
    animation: cb-slide-up 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes cb-slide-up {
    from { transform: translateY(20px); opacity: 0; }
    to   { transform: translateY(0);    opacity: 1; }
}

.cb-cooldown-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: oklch(95% 0.03 30);
    color: oklch(55% 0.18 30);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 4px;
}

.cb-cooldown-title {
    margin: 0;
    font-size: 15px;
    font-weight: 700;
    color: var(--cb-text);
    letter-spacing: -0.01em;
}

.cb-cooldown-desc {
    margin: 0;
    font-size: 12px;
    color: var(--cb-text-dim);
    line-height: 1.6;
}

/* SVG countdown ring */
.cb-cooldown-ring-wrap {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 12px 0 4px;
}

.cb-cooldown-ring {
    width: 80px;
    height: 80px;
    transform: rotate(-90deg);    /* start progress from 12 o'clock */
}

.cb-cooldown-ring-bg {
    fill: none;
    stroke: var(--cb-border);
    stroke-width: 5;
}

.cb-cooldown-ring-fill {
    fill: none;
    stroke: oklch(55% 0.18 30);   /* warm amber-orange */
    stroke-width: 5;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s linear;
}

.cb-cooldown-seconds {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    color: var(--cb-text);
    letter-spacing: -0.03em;
}

.cb-cooldown-label {
    margin: 0;
    font-size: 11px;
    color: var(--cb-text-dim);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}