:root {
    /* ===== Màu chủ đạo ===== */
    --cpap-primary: #2a6bff;
    --cpap-primary-hover: #2a6bff;
    --cpap-gradient-start: #2a6bff;
    --cpap-gradient-end: #2a6bff;
    --cpap-accent: #2a6bff; /* viền focus */
    --cpap-gradient: linear-gradient(125deg, var(--cpap-gradient-start), var(--cpap-gradient-end));

    /* ===== Nền ===== */
    --cpap-bg: #fafafa;
    --cpap-bg-soft: #f3f7ff;
    --cpap-bg-error: #fff2f2;

    /* ===== Chữ ===== */
    --cpap-text: #14233b;
    --cpap-text-assistant: #5b7191;
    --cpap-text-label: #2b3f5c;
    --cpap-text-muted: #5d6f89;
    --cpap-text-hint: #6b7c95;
    --cpap-text-on-primary: #fff;
    --cpap-required: #d93a45;
    --cpap-error: #b3261e;

    /* ===== Viền ===== */
    --cpap-border: #d9e4f7;
    --cpap-border-soft: #e3ebf9;
    --cpap-border-divider: #e0e8f6;
    --cpap-border-input: #cbd8ee;
    --cpap-border-error: #f1d3d5;

    --cpap-white-rgb: 255 255 255;
    --cpap-shadow-widget-rgb: 9 30 82;
    --cpap-shadow-toggle-rgb: 9 78 255;
    --cpap-focus-rgb: 9 78 255;

    /* ===== Kích thước chung cho input + nút ===== */
    --cpap-control-height: 44px;
    --cpap-control-radius: 12px;
    --cpap-control-gap: 10px;
}

/* ---------- Base ---------- */
.cpap-chat-form {
    font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* ---------- Khung chat ---------- */
.cpap-chat-form__widget {
    position: fixed;
    right: 24px;
    bottom: 88px;
    z-index: 99999;
    display: flex;
    flex-direction: column;
    width: min(400px, calc(100vw - 32px));
    height: min(680px, calc(100vh - 120px));
    overflow: hidden;
    border: 1px solid var(--cpap-border);
    border-radius: 18px;
    background: var(--cpap-bg-soft);
    box-shadow: 0 18px 55px rgb(var(--cpap-shadow-widget-rgb) / 24%);
}

.cpap-chat-form__widget[hidden] {
    display: none;
}

/* ---------- Tiêu đề ---------- */
.cpap-chat-form__title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 17px 18px;
    color: var(--cpap-text-on-primary);
    background: var(--cpap-gradient);
}

.cpap-chat-form__title div {
    display: grid;
    gap: 2px;
}

.cpap-chat-form__title strong {
    font-size: 1.6em;
    font-weight: 650;
    letter-spacing: 0.01em;
}

.cpap-chat-form__title span {
    color: rgb(var(--cpap-white-rgb) / 78%);
    font-size: 12px;
}

.cpap-chat-form .cpap-chat-form__close {
    display: grid;
    width: 34px;
    height: 34px;
    flex: 0 0 auto;
    place-items: center;
    margin: 0;
    padding: 0;
    color: var(--cpap-text-on-primary);
    border: 1px solid rgb(var(--cpap-white-rgb) / 28%);
    border-radius: 50%;
    background: rgb(var(--cpap-white-rgb) / 10%);
    cursor: pointer;
}

.cpap-chat-form .cpap-chat-form__close:hover {
    background: rgb(var(--cpap-white-rgb) / 20%);
}

/* ---------- Tin nhắn ---------- */
.cpap-chat-form__messages {
    display: flex;
    flex: 1;
    flex-direction: column;
    gap: 12px;
    min-height: 120px;
    overflow-y: auto;
    padding: 18px;
    overscroll-behavior: contain;
}

.cpap-chat-form__message {
    max-width: min(84%, 680px);
    padding: 11px 14px;
    border-radius: 16px;
    overflow-wrap: anywhere;
    white-space: pre-wrap;
}

.cpap-chat-form__message--assistant {
    align-self: flex-start;
    color: var(--cpap-text-assistant);
    border: 1px solid var(--cpap-border-soft);
    border-bottom-left-radius: 5px;
    background: var(--cpap-bg);
}

.cpap-chat-form__message--user {
    align-self: flex-end;
    color: var(--cpap-text-on-primary);
    border-bottom-right-radius: 5px;
    background: var(--cpap-primary);
}

.cpap-chat-form__message.is-error {
    color: var(--cpap-error);
    border-color: var(--cpap-border-error);
    background: var(--cpap-bg-error);
}

/* ---------- Form ---------- */
.cpap-chat-form__widget .cpap-chat-form__form {
    display: block;
    margin: 0;
    padding: 0 14px;
}

/* Ẩn label bằng cách "visually hidden" để vẫn đọc được bằng screen reader */
.cpap-chat-form__form label {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

/* Hàng họ tên + số điện thoại */
.cpap-chat-form__customer {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--cpap-control-gap);
    padding: 14px 0;
    border-top: 1px solid var(--cpap-border-divider);
}

/* Hàng câu hỏi + nút gửi */
.cpap-chat-form__composer {
    display: flex;
    align-items: stretch;
    gap: var(--cpap-control-gap);
    padding: 14px 0;
    border-top: 1px solid var(--cpap-border-divider);
}

/* ---------- Input & nút: cùng chiều cao, cùng bo góc ---------- */
.cpap-chat-form .cpap-chat-form__customer input,
.cpap-chat-form .cpap-chat-form__composer input,
.cpap-chat-form .cpap-chat-form__composer button {
    box-sizing: border-box;
    height: var(--cpap-control-height);
    min-height: var(--cpap-control-height);
    margin: 0;
    border-radius: var(--cpap-control-radius);
    font: inherit;
    line-height: normal;
    box-shadow: none;
    -webkit-appearance: none;
    appearance: none;
}

.cpap-chat-form .cpap-chat-form__customer input,
.cpap-chat-form .cpap-chat-form__composer input {
    width: 100%;
    min-width: 0;
    padding: 0 14px;
    color: var(--cpap-text);
    border: 1px solid var(--cpap-border-input);
    background: var(--cpap-bg);
}

.cpap-chat-form .cpap-chat-form__composer input {
    flex: 1;
}

.cpap-chat-form .cpap-chat-form__customer input::placeholder,
.cpap-chat-form .cpap-chat-form__composer input::placeholder {
    color: var(--cpap-text-hint);
    opacity: 1;
}

.cpap-chat-form .cpap-chat-form__customer input:focus,
.cpap-chat-form .cpap-chat-form__composer input:focus {
    border-color: var(--cpap-accent);
    outline: 3px solid rgb(var(--cpap-focus-rgb) / 15%);
}

.cpap-chat-form .cpap-chat-form__composer button {
    flex: 0 0 auto;
    padding: 0 20px;
    color: var(--cpap-text-on-primary);
    border: 0;
    background: var(--cpap-primary);
    font-weight: 650;
    cursor: pointer;
    transition: background-color 140ms ease, opacity 140ms ease;
}

.cpap-chat-form .cpap-chat-form__composer button:hover {
    background: var(--cpap-primary-hover);
}

.cpap-chat-form .cpap-chat-form__composer button:disabled {
    opacity: 0.6;
    cursor: wait;
}

/* ---------- Trạng thái ---------- */
.cpap-chat-form__status {
    margin: 0;
    padding: 0 14px 12px;
    color: var(--cpap-text-muted);
}

.cpap-chat-form__status:empty {
    display: none; /* không chiếm chỗ khi chưa có thông báo */
}

/* ---------- Nút mở chat ---------- */
.cpap-chat-form .cpap-chat-form__toggle {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 100000;
    min-height: 52px;
    margin: 0;
    padding: 0 21px;
    color: var(--cpap-text-on-primary);
    border: 0;
    border-radius: 28px;
    background: var(--cpap-gradient);
    box-shadow: 0 7px 22px rgb(var(--cpap-shadow-toggle-rgb) / 30%);
    font: inherit;
    font-weight: 650;
    cursor: pointer;
    transition: transform 140ms ease, box-shadow 140ms ease;
}

.cpap-chat-form .cpap-chat-form__toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 26px rgb(var(--cpap-shadow-toggle-rgb) / 36%);
}

.cpap-chat-form__toggle-close {
    display: none;
}

.cpap-chat-form__toggle[aria-expanded="true"] .cpap-chat-form__toggle-open {
    display: none;
}

.cpap-chat-form__toggle[aria-expanded="true"] .cpap-chat-form__toggle-close {
    display: inline;
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
    .cpap-chat-form__message {
        max-width: 92%;
    }

    .cpap-chat-form__widget {
        right: 12px;
        bottom: 78px;
        width: calc(100vw - 24px);
        height: min(680px, calc(100vh - 102px));
    }

    .cpap-chat-form .cpap-chat-form__toggle {
        right: 16px;
        bottom: 16px;
    }
}

@media (max-width: 360px) {
    .cpap-chat-form__customer {
        grid-template-columns: 1fr;
    }
}