:root {
    --paper: #f3f0e8;
    --card: #fffdf9;
    --ink: #16241f;
    --ink-soft: #55645e;
    --line: #e2ddd0;
    --green-900: #0b2f2c;
    --green-800: #0f3d3a;
    --green-700: #17524d;
    --green-100: #e3eeea;
    --brass: #b8924a;
    --brass-light: #d9b779;
    --brass-soft: #f6ecd6;
    --brass-ink: #6e4f17;
    --danger: #c7372f;
    --radius: 16px;
    --ease: cubic-bezier(.22, .61, .36, 1);
    --edge: 24px;
    --gutter: max(var(--edge), calc((100vw - 960px) / 2));
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--card);
    font-family: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
}

/* ---------- full-screen shell ---------- */
.app {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background: var(--card);
    overflow: hidden;
}

.app>* {
    flex-shrink: 0;
}

/* ---------- top bar (brand + token) ---------- */
.topbar {
    position: relative;
    color: #f3f6f3;
    background:
        radial-gradient(560px 180px at 100% 0%, #1f6a63 0%, transparent 70%),
        linear-gradient(180deg, var(--green-800), var(--green-900));
}

.topbar::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--brass), transparent);
    opacity: .55;
}

.masthead {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px var(--edge) 12px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-mark {
    display: grid;
    place-items: center;
    color: #eaf3ef;
    line-height: 0;
}

h1 {
    margin: 0;
    font-family: Fraunces, Georgia, serif;
    font-weight: 600;
    font-size: 28px;
    letter-spacing: -.01em;
    line-height: 1;
}

h1 em {
    font-style: normal;
    color: var(--brass-light);
}

.masthead p {
    margin: 6px 0 0;
    font-size: 12.5px;
    letter-spacing: .02em;
    color: #b9d1ca;
}

.masthead-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

#newChat {
    padding: 7px 12px;
    font-size: 12.5px;
    color: #d5e6e0;
    background: #ffffff0d;
    border-color: #ffffff26;
    border-radius: 99px;
}

#newChat:hover {
    color: #fff;
    background: #ffffff1f;
}

.scroll-bottom {
    position: absolute;
    right: max(var(--edge), calc((100vw - 960px) / 2));
    bottom: 96px;
    z-index: 20;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #ffffff;
    color: var(--green-900);
    border: 1px solid var(--line);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: transform .18s var(--ease), opacity .18s, background .18s, box-shadow .18s;
}

.scroll-bottom:hover {
    background: var(--paper);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.16);
}

.scroll-bottom:active {
    transform: scale(0.94);
}

.scroll-bottom[hidden] {
    display: none !important;
}

/* ---------- token bar ---------- */
.tokenbar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 var(--edge) 14px;
}

.tokenbar label {
    font-size: 11.5px;
    font-weight: 500;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: #9dbdb5;
    white-space: nowrap;
}

.token-field {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 0 1 420px;
    padding: 0 4px 0 11px;
    color: #9dbdb5;
    background: #ffffff12;
    border: 1px solid #ffffff26;
    border-radius: 10px;
    transition: border-color .2s, box-shadow .2s;
}

.token-field:focus-within {
    border-color: var(--brass-light);
    box-shadow: 0 0 0 3px #d9b77933;
}

.token-field svg {
    flex-shrink: 0;
}

.token-field input {
    flex: 1;
    min-width: 0;
    padding: 9px 4px;
    font: inherit;
    font-size: 13.5px;
    color: #eef5f2;
    background: transparent;
    border: 0;
    outline: none;
}

.token-field input::placeholder {
    color: #86a8a0;
}

#toggleToken {
    padding: 6px;
    color: #9dbdb5;
    border-radius: 8px;
}

#toggleToken:hover {
    color: #fff;
    background: #ffffff1a;
}

#toggleToken .slash {
    display: none;
}

#toggleToken.shown .slash {
    display: block;
}

#connect {
    padding: 9px 18px;
    font-weight: 600;
    color: #2a1f08;
    background: var(--brass-light);
    box-shadow: 0 1px 0 #ffffff55 inset;
}

#connect:hover {
    background: #e6c88f;
}

#connect.done {
    background: #8fd6b0;
}

.tokenbar.invalid .token-field {
    border-color: #f08a84;
    box-shadow: 0 0 0 3px #e5534b33;
    animation: shake .35s;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

/* ---------- message enhancements ---------- */
.pdf-tag {
    display: inline-block;
    padding: 1px 7px;
    margin: 0 3px;
    font-size: 11.5px;
    font-weight: 600;
    color: var(--brass-ink);
    background: var(--brass-soft);
    border: 1px solid #ebd9b5;
    border-radius: 6px;
    letter-spacing: .01em;
}

.bot a {
    color: var(--green-700);
    text-decoration: underline;
    text-underline-offset: 3px;
    word-break: break-all;
    font-weight: 500;
}

.bot a:hover {
    color: var(--green-900);
}

.msg-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px dashed var(--line);
}

.msg-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 9px;
    font-size: 11.5px;
    font-weight: 500;
    color: var(--ink-soft);
    background: #fbf9f4;
    border: 1px solid var(--line);
    border-radius: 7px;
    cursor: pointer;
    transition: all .16s var(--ease);
}

.msg-btn:hover {
    color: var(--ink);
    background: var(--green-100);
    border-color: #b9d3cb;
}

.msg-btn.copied {
    color: #17524d;
    background: #e3f1ed;
    border-color: #8ec3b5;
}

/* ---------- conversation ---------- */
#messages {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    padding: 28px var(--gutter);
    display: flex;
    flex-direction: column;
    gap: 16px;
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: #cfc8b6 transparent;
    background:
        radial-gradient(800px 360px at 90% 0%, #eef3ee 0%, transparent 70%),
        var(--card);
}

#messages::-webkit-scrollbar {
    width: 8px;
}

#messages::-webkit-scrollbar-thumb {
    background: #d4ceba;
    border-radius: 8px;
    border: 2px solid var(--card);
}

.bot,
.user {
    max-width: min(78%, 720px);
    padding: 14px 18px;
    line-height: 1.65;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    animation: rise .35s var(--ease) both;
}

.bot {
    align-self: flex-start;
    color: var(--ink);
    background: #fff;
    border: 1px solid var(--line);
    border-left: 3px solid var(--brass);
    border-radius: 4px 16px 16px 16px;
    box-shadow: 0 1px 2px #16241f0a;
}

.bot::before {
    content: "DocAI";
    display: block;
    margin-bottom: 4px;
    font-family: Fraunces, Georgia, serif;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--brass);
}

.user {
    align-self: flex-end;
    color: #f2f7f4;
    background: linear-gradient(180deg, var(--green-700), var(--green-800));
    border-radius: 16px 16px 4px 16px;
    box-shadow: 0 6px 16px -8px #0b2f2c80;
}

.bot.thinking {
    color: var(--ink-soft);
    animation: rise .35s var(--ease) both, breathe 1.4s ease-in-out .35s infinite;
}

.sources {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px dashed var(--line);
    font-size: 12px;
    line-height: 1.55;
    color: var(--ink-soft);
    white-space: normal;
}

.stream-stopped {
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px dashed var(--line);
    font-size: 11.5px;
    color: var(--ink-soft);
    font-style: italic;
}

.stream-error {
    margin-top: 10px;
    padding: 8px 10px;
    background: #fdf2f2;
    border: 1px solid #f8d7da;
    border-radius: 8px;
    font-size: 12px;
    color: var(--danger);
}

/* ---------- empty state ---------- */
.empty {
    margin: auto;
    max-width: 580px;
    padding: 20px 0 40px;
    text-align: center;
    animation: rise .5s var(--ease) both;
}

.empty-mark {
    display: grid;
    place-items: center;
    width: 56px;
    height: 56px;
    margin: 0 auto 18px;
    color: var(--green-800);
    background: var(--green-100);
    border-radius: 18px;
}

.empty h2 {
    margin: 0 0 20px;
    font-family: Fraunces, Georgia, serif;
    font-weight: 500;
    font-size: 27px;
    letter-spacing: -.01em;
    color: var(--green-900);
}

.chips {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}

.chip {
    padding: 9px 16px;
    font-size: 13.5px;
    color: var(--ink);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 99px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
    transition: all .18s var(--ease);
}

.chip:hover {
    background: var(--green-100);
    border-color: #b9d3cb;
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(15, 61, 58, 0.08);
}

.chip:active {
    transform: scale(0.98);
}

.typing-dots {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    vertical-align: middle;
    margin-left: 6px;
}

.typing-dots span {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--brass);
    display: inline-block;
    animation: typingBounce 1.2s infinite ease-in-out;
}

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

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

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-4px);
        opacity: 1;
    }
}

#listen.playing {
    color: var(--green-900);
    background: #e3f1ed;
    border-color: #8ec3b5;
}

#messages.started .empty,
#messages:has(article) .empty {
    display: none;
}

@keyframes rise {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: none;
    }
}

@keyframes breathe {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: .45;
    }
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 #c7372f66;
    }

    70% {
        box-shadow: 0 0 0 9px #c7372f00;
    }

    100% {
        box-shadow: 0 0 0 0 #c7372f00;
    }
}

/* ---------- image preview ---------- */
#preview {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 0 var(--gutter) 4px;
    padding: 10px 12px;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 14px;
}

#thumbnail {
    width: 64px;
    height: 64px;
    object-fit: cover;
    border-radius: 10px;
    border: 1px solid var(--line);
}

#remove {
    margin-left: auto;
    font-size: 13px;
    padding: 8px 12px;
}

/* ---------- composer ---------- */
form {
    padding: 14px var(--gutter) max(16px, env(safe-area-inset-bottom));
    border-top: 1px solid var(--line);
    background: linear-gradient(180deg, #fbf9f4, var(--card));
}

.composer {
    background: #fff;
    border: 1px solid #d8d2c2;
    border-radius: var(--radius);
    padding: 6px;
    transition: border-color .2s, box-shadow .2s, background .2s;
}

.composer:focus-within {
    border-color: var(--green-700);
    box-shadow: 0 0 0 4px #17524d1c;
}

.composer.dragover {
    border-color: var(--brass);
    background: #fdfaf2;
    box-shadow: 0 0 0 4px #b8924a26;
}

textarea {
    display: block;
    width: 100%;
    resize: none;
    border: 0;
    background: transparent;
    padding: 10px 12px 6px;
    font: inherit;
    line-height: 1.55;
    color: var(--ink);
    outline: none;
    min-height: 56px;
    max-height: 200px;
}

textarea::placeholder {
    color: #9aa39d;
}

.toolbar {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
    padding: 4px 4px 2px;
}

.hint {
    margin-left: auto;
    margin-right: 8px;
    font-size: 11.5px;
    color: #98a19b;
    white-space: nowrap;
}

/* ---------- buttons ---------- */
button,
.action {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    border: 1px solid transparent;
    border-radius: 10px;
    padding: 8px 11px;
    cursor: pointer;
    font: inherit;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--green-800);
    background: transparent;
    transition: background .18s, color .18s, border-color .18s, transform .12s var(--ease), box-shadow .18s;
}

button:hover,
.action:hover {
    background: var(--green-100);
}

button:active,
.action:active {
    transform: scale(.97);
}

button:focus-visible,
.action:focus-within {
    outline: 2px solid var(--brass);
    outline-offset: 2px;
}

button svg,
.action svg {
    flex-shrink: 0;
}

#send {
    padding: 9px 18px;
    color: #fff;
    background: linear-gradient(180deg, var(--green-700), var(--green-800));
    box-shadow: 0 6px 14px -6px #0b2f2caa, 0 1px 0 #ffffff26 inset;
}

#send:hover {
    background: linear-gradient(180deg, #1c5f59, var(--green-700));
    box-shadow: 0 8px 18px -6px #0b2f2cc0, 0 1px 0 #ffffff26 inset;
}

#send svg {
    transition: transform .2s var(--ease);
}

#send:hover svg {
    transform: translateX(3px);
}

#send .stop-icon {
    display: none;
}

#send .send-icon {
    display: block;
}

#send.stop {
    background: linear-gradient(180deg, #b83a34, #942924);
    box-shadow: 0 6px 14px -6px #781d18aa, 0 1px 0 #ffffff26 inset;
}

#send.stop:hover {
    background: linear-gradient(180deg, #c7372f, #a82e28);
    box-shadow: 0 8px 18px -6px #781d18c0, 0 1px 0 #ffffff26 inset;
}

#send.stop:hover svg {
    transform: none;
}

#send.stop .send-icon {
    display: none;
}

#send.stop .stop-icon {
    display: block;
}

button:disabled {
    opacity: .5;
    cursor: wait;
    transform: none;
}

/* ---------- recording state ---------- */
#mic.recording {
    color: var(--danger);
    background: #fbe9e7;
    border-color: #f1c3be;
}

#mic.recording svg {
    display: none;
}

#mic.recording::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--danger);
    animation: pulse 1.3s ease-out infinite;
}

/* ---------- camera overlay ---------- */
body:has(#video:not([hidden]))::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 25;
    background: #08120fb8;
    backdrop-filter: blur(5px);
}

#video {
    --cam-w: min(92vw, 560px);
    position: fixed;
    z-index: 30;
    left: 50%;
    top: 50%;
    width: var(--cam-w);
    height: calc(var(--cam-w) * .75);
    transform: translate(-50%, -58%);
    object-fit: cover;
    background: #0d1613;
    border: 1px solid #ffffff30;
    border-radius: 18px;
    box-shadow: 0 30px 80px #000a;
}

#cameraActions {
    --cam-w: min(92vw, 560px);
    position: fixed;
    z-index: 30;
    left: 50%;
    top: calc(50% + var(--cam-w) * .315 + 16px);
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

#snap {
    padding: 10px 22px;
    font-weight: 600;
    color: #2a1f08;
    background: var(--brass-light);
}

#snap:hover {
    background: #e6c88f;
}

#closeCamera {
    padding: 10px 18px;
    color: #fff;
    border-color: #ffffff40;
    background: #ffffff14;
}

#closeCamera:hover {
    background: #ffffff2b;
}

/* ---------- small screens ---------- */
@media (max-width: 700px) {
    :root {
        --edge: 14px;
    }

    body {
        font-size: 14.5px;
    }

    .masthead {
        padding-top: max(12px, env(safe-area-inset-top));
    }

    h1 {
        font-size: 24px;
    }

    .masthead p,
    .hint,
    .tokenbar label,
    #newChat span {
        display: none;
    }

    #newChat {
        padding: 8px;
    }

    .token-field {
        flex: 1 1 auto;
    }

    #messages {
        padding-top: 18px;
        padding-bottom: 18px;
    }

    .bot,
    .user {
        max-width: 92%;
    }

    .empty h2 {
        font-size: 23px;
    }

    .toolbar {
        gap: 2px;
    }

    button,
    .action {
        padding: 8px 9px;
        font-size: 13px;
    }

    #send {
        margin-left: auto;
        padding: 9px 14px;
    }
}

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
    }
}