body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.chat-page {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    position: relative;
}

.chat-page::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        var(--tf-bg-image),
        linear-gradient(180deg, rgba(243, 247, 250, 0.58), rgba(237, 244, 248, 0.74));
    background-size: cover, auto;
    background-position: center top, center;
    background-repeat: no-repeat, no-repeat;
    pointer-events: none;
    z-index: 0;
}

.chat-header,
.security-banner,
.chat-messages,
.chat-typing,
.composer {
    position: relative;
    z-index: 1;
}

.modal-overlay {
    z-index: 100;
}

.chat-header {
    flex-shrink: 0;
    min-height: 62px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--sp-5);
    background: linear-gradient(135deg, var(--tf-primary) 0%, var(--tf-primary-dark) 100%);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.14), var(--sh-sm);
    gap: var(--sp-2);
}

.chat-header__brand {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
}

.chat-header__logo-wrap {
    display: grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border-radius: var(--r-md);
    background: rgba(255, 255, 255, 0.14);
    color: var(--tf-text-inv);
}

.chat-header__title {
    display: block;
    color: var(--tf-text-inv);
    font-size: clamp(20px, 2.6vw, 28px);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.28);
}

.chat-header__subtitle {
    display: block;
    color: rgba(255, 255, 255, 0.72);
    font-size: 11px;
    line-height: 1.3;
}

.chat-header__actions {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
}

.chat-header__btn,
.chat-header__link {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-1);
    min-height: 36px;
    border-radius: var(--r-sm);
    border: 1px solid rgba(255, 255, 255, 0.32);
    background: rgba(255, 255, 255, 0.11);
    color: rgba(255, 255, 255, 0.86);
    font-size: 12px;
    font-weight: 600;
    padding: 6px 11px;
    text-decoration: none;
    cursor: pointer;
    transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}

.chat-header__btn:hover,
.chat-header__link:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.55);
    color: #fff;
}

.chat-header__btn:focus-visible,
.chat-header__link:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.88);
    outline-offset: 2px;
}

.security-banner {
    flex-shrink: 0;
    display: flex;
    align-items: flex-start;
    gap: var(--sp-3);
    padding: 10px var(--sp-5);
    background: linear-gradient(180deg, #eef8fc, #e6f4f9);
    border-bottom: 1px solid rgba(11, 114, 133, 0.2);
    color: #155368;
    font-size: 12.5px;
    line-height: 1.45;
}

.security-banner__icon {
    color: var(--tf-primary);
    margin-top: 2px;
    flex-shrink: 0;
}

.security-banner__text {
    flex: 1;
    margin: 0;
}

.security-banner__close {
    display: grid;
    place-items: center;
    width: 26px;
    height: 26px;
    border-radius: var(--r-sm);
    border: none;
    background: transparent;
    color: var(--tf-primary);
    opacity: 0.6;
    cursor: pointer;
    transition: opacity var(--t-fast), background var(--t-fast);
}

.security-banner__close:hover {
    opacity: 1;
    background: rgba(11, 114, 133, 0.12);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
    width: min(860px, 100%);
    margin: 0 auto;
    padding: var(--sp-6) var(--sp-4) var(--sp-3);
}

.chat-message {
    display: flex;
    animation: msg-in 220ms ease-out both;
}

.chat-message--assistant {
    justify-content: flex-start;
}

.chat-message--user {
    justify-content: flex-end;
}

@keyframes msg-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.chat-bubble {
    max-width: min(74%, 620px);
    border-radius: var(--r-xl);
    padding: 12px 16px;
    font-size: clamp(13.5px, 2vw, 14.8px);
    line-height: 1.62;
    box-shadow: var(--sh-sm);
    word-break: break-word;
}

.chat-bubble--assistant {
    background: #fff;
    color: var(--tf-text-1);
    border: 1px solid var(--tf-border-light);
    border-bottom-left-radius: var(--r-sm);
}

.chat-bubble--user {
    background: linear-gradient(135deg, var(--tf-primary) 0%, var(--tf-primary-mid) 100%);
    color: var(--tf-text-inv);
    border-bottom-right-radius: var(--r-sm);
    white-space: pre-wrap;
}

.chat-messages:has(> .chat-message:only-child) {
    justify-content: center;
}

.chat-messages:has(> .chat-message:only-child) .chat-message--assistant {
    justify-content: center;
}

.chat-messages:has(> .chat-message:only-child) .chat-bubble--assistant {
    max-width: 560px;
    width: 100%;
    border-radius: var(--r-xl);
    padding: 22px 24px;
    box-shadow: var(--sh-md);
    border-color: rgba(11, 114, 133, 0.16);
}

.chat-typing {
    width: min(860px, 100%);
    margin: 0 auto;
    padding: 0 var(--sp-4) var(--sp-2);
}

.typing-wrap {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border-radius: var(--r-xl);
    border: 1px solid var(--tf-border-light);
    background: #fff;
    padding: 12px 15px;
    box-shadow: var(--sh-xs);
}

.typing-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--tf-primary);
    opacity: 0.35;
    animation: typing-pulse 1.3s infinite ease-in-out;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing-pulse {
    0%, 70%, 100% {
        transform: translateY(0);
        opacity: 0.35;
    }
    35% {
        transform: translateY(-5px);
        opacity: 1;
    }
}

.composer {
    flex-shrink: 0;
    width: min(860px, 100%);
    margin: 0 auto;
    padding: var(--sp-3) var(--sp-4) calc(var(--sp-4) + env(safe-area-inset-bottom));
}

.composer__card {
    background: #fff;
    border: 1.5px solid var(--tf-border);
    border-radius: var(--r-lg);
    box-shadow: var(--sh-md);
    overflow: hidden;
    transition: border-color var(--t-base), box-shadow var(--t-base);
}

.composer__card:focus-within {
    border-color: var(--tf-primary);
    box-shadow: var(--sh-md), 0 0 0 3px rgba(11, 114, 133, 0.14);
}

.composer__textarea {
    width: 100%;
    border: none;
    outline: none;
    resize: none;
    min-height: 54px;
    max-height: 140px;
    overflow-y: auto;
    font: inherit;
    font-size: clamp(14px, 2vw, 15px);
    color: var(--tf-text-1);
    line-height: 1.55;
    padding: 14px 14px 8px;
}

.composer__textarea::placeholder {
    color: var(--tf-text-3);
}

.composer__toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-2);
    padding: var(--sp-2) var(--sp-3) var(--sp-3);
    border-top: 1px solid var(--tf-border-light);
}

.composer__upload-group {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
}

.composer__upload-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 40px;
    border-radius: var(--r-sm);
    border: 1px solid rgba(11, 114, 133, 0.24);
    background: linear-gradient(180deg, #f4fafc, #eaf6fa);
    color: var(--tf-primary);
    padding: 6px 12px;
    font-size: 12.5px;
    font-weight: 650;
    cursor: pointer;
    transition: border-color var(--t-fast), background var(--t-fast);
}

.composer__upload-btn:hover {
    border-color: rgba(11, 114, 133, 0.4);
    background: linear-gradient(180deg, #edf7fb, #e1f1f7);
}

.upload-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.045em;
    color: var(--tf-success);
    font-weight: 700;
    opacity: 0.85;
}

.composer__send-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 40px;
    border-radius: var(--r-sm);
    border: none;
    background: linear-gradient(135deg, var(--tf-primary), var(--tf-primary-mid));
    color: #fff;
    padding: 7px 16px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: transform var(--t-fast), filter var(--t-fast), box-shadow var(--t-fast);
}

.composer__send-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    filter: saturate(1.04);
    box-shadow: 0 8px 18px rgba(11, 114, 133, 0.28);
}

.composer__send-btn:disabled {
    background: #a6b8c3;
    color: #eef3f6;
    cursor: not-allowed;
    box-shadow: none;
}

.composer__hint {
    text-align: center;
    color: var(--tf-text-3);
    font-size: 11px;
    margin-top: 8px;
}

.t4-chip {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    margin: 11px 13px 0;
    background: #e7f5fa;
    border: 1px solid rgba(11, 114, 133, 0.22);
    border-radius: var(--r-sm);
    padding: 5px 8px 5px 10px;
    color: var(--tf-primary-dark);
    font-size: 12px;
    font-weight: 600;
}

.t4-chip > span:not([class]) {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.t4-chip__remove {
    width: 24px;
    height: 24px;
    display: grid;
    place-items: center;
    border: none;
    border-radius: var(--r-xs);
    background: transparent;
    color: var(--tf-primary);
    cursor: pointer;
    opacity: 0.6;
    transition: opacity var(--t-fast), background var(--t-fast);
}

.t4-chip__remove:hover {
    opacity: 1;
    background: rgba(11, 114, 133, 0.12);
}

.results-card {
    max-width: min(74%, 620px);
    border-radius: var(--r-md);
    border: 1px solid var(--tf-border);
    background: #fff;
    padding: var(--sp-5);
    box-shadow: var(--sh-sm);
}

.results-card--refund {
    border-left: 4px solid var(--tf-success);
}

.results-card--owing {
    border-left: 4px solid var(--tf-warning);
}

.results-card__headline {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--sp-3);
    margin-bottom: var(--sp-4);
}

.results-card__label {
    font-size: 11.5px;
    color: var(--tf-text-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 700;
}

.results-card__amount {
    font-size: clamp(22px, 4vw, 28px);
    font-weight: 800;
    letter-spacing: -0.02em;
}

.results-card--refund .results-card__amount {
    color: var(--tf-success);
}

.results-card--owing .results-card__amount {
    color: var(--tf-warning);
}

.results-card__summary {
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-4);
    color: var(--tf-text-2);
    font-size: 12px;
    margin-bottom: var(--sp-4);
}

.results-card__breakdown {
    border-top: 1px solid var(--tf-border-light);
    padding-top: var(--sp-2);
}

.results-card__breakdown summary {
    cursor: pointer;
    color: var(--tf-primary);
    font-size: 12px;
    font-weight: 650;
    padding: 2px 0;
}

.results-breakdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
    margin-top: 8px;
}

.results-breakdown-table td {
    padding: 4px 6px;
}

.results-breakdown-table td:last-child {
    text-align: right;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

.results-breakdown-table tr:nth-child(odd) {
    background: #f8fbfd;
}

.results-card__full-link {
    display: inline-block;
    margin-top: 12px;
    color: var(--tf-primary);
    font-size: 12px;
    font-weight: 650;
    text-decoration: none;
}

.results-card__full-link:hover {
    text-decoration: underline;
}

.results-card__disclaimer {
    margin-top: 10px;
    color: var(--tf-text-3);
    font-size: 11px;
    font-style: italic;
}

.modal-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(8, 21, 30, 0.5);
    backdrop-filter: blur(4px);
}

.modal {
    width: min(440px, calc(100% - 32px));
    background: #fff;
    border-radius: var(--r-lg);
    box-shadow: 0 24px 50px rgba(8, 20, 28, 0.3);
    padding: 24px 24px 20px;
}

.modal__header {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    margin-bottom: var(--sp-4);
}

.modal__icon-ring {
    width: 44px;
    height: 44px;
    border-radius: var(--r-md);
    display: grid;
    place-items: center;
    background: #e8f4fa;
    color: var(--tf-primary);
}

.modal__title {
    margin: 0;
    font-size: 18px;
    color: var(--tf-text-1);
    letter-spacing: -0.015em;
}

.modal__body {
    margin: 0 0 var(--sp-3);
    font-size: 14px;
    color: var(--tf-text-2);
    line-height: 1.6;
}

.modal__remember {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--tf-text-2);
    font-size: 13px;
    margin: var(--sp-4) 0 var(--sp-5);
}

.modal__actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--sp-2);
}

.modal__btn {
    min-height: 40px;
    border: none;
    border-radius: var(--r-sm);
    padding: 9px 17px;
    font-size: 14px;
    font-weight: 650;
    cursor: pointer;
}

.modal__btn--cancel {
    background: #eef3f6;
    color: var(--tf-text-2);
}

.modal__btn--confirm {
    background: linear-gradient(135deg, var(--tf-primary), var(--tf-primary-mid));
    color: #fff;
}

.hidden {
    display: none !important;
}

.chat-footer {
    flex-shrink: 0;
    width: min(860px, 100%);
    margin: 0 auto;
    padding: 0 10px calc(10px + env(safe-area-inset-bottom));
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.chat-footer__disclaimer {
    color: var(--tf-text-3);
    font-size: 10.5px;
    line-height: 1.45;
    max-width: 520px;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}

@media (max-width: 700px) {
    .chat-header {
        padding-inline: 12px;
    }

    .chat-header__subtitle {
        display: none;
    }

    .chat-header__title {
        font-size: clamp(17px, 5.2vw, 22px);
    }

    .chat-header__btn > span,
    .composer__send-btn > span {
        display: none;
    }

    .chat-header__btn,
    .chat-header__link {
        min-height: 34px;
        padding: 6px 9px;
    }

    .chat-messages,
    .chat-typing,
    .composer,
    .chat-footer {
        width: 100%;
    }

    .chat-messages {
        padding: 14px 10px 8px;
        gap: 10px;
    }

    .chat-bubble,
    .results-card {
        max-width: 90%;
    }

    .composer {
        padding: 8px 10px calc(10px + env(safe-area-inset-bottom));
    }

    .composer__textarea {
        font-size: 16px;
        min-height: 52px;
    }

    .security-banner {
        padding-inline: 12px;
        font-size: 12px;
    }

    .upload-badge,
    .composer__hint {
        display: none;
    }
}

@media (max-width: 460px) {
    .chat-header__title {
        font-size: 18px;
    }

    .chat-header__logo-wrap {
        width: 30px;
        height: 30px;
    }

    .chat-header__actions {
        gap: 6px;
    }

    .chat-header__link {
        font-size: 11px;
        padding: 5px 8px;
    }

    .composer__upload-btn span {
        display: none;
    }

    .composer__upload-btn {
        width: 40px;
        padding-inline: 0;
        justify-content: center;
    }

    .chat-bubble,
    .results-card {
        max-width: 94%;
    }

    .security-banner {
        gap: 8px;
        font-size: 11px;
    }
}