:root {
    --bg: #fff1f7;
    --panel: #ffffffcc;
    --pink: #f7a7c9;
    --pink-strong: #e875aa;
    --text: #4a3340;
    --muted: #8b6878;
    --border: #f5c8dc;
    --assistant: #ffffff;
    --user: #ffe1ef;
    --danger: #b3264a;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, #ffe0ef 0, transparent 32%),
        radial-gradient(circle at bottom right, #ffd1e6 0, transparent 30%),
        var(--bg);
}

button, input, textarea { font: inherit; }

.login-shell, .app-shell {
    width: min(960px, calc(100% - 28px));
    margin: 0 auto;
}

.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
}

.login-card {
    width: min(420px, 100%);
    padding: 34px;
    border: 1px solid var(--border);
    border-radius: 28px;
    background: var(--panel);
    box-shadow: 0 24px 80px #e875aa33;
    text-align: center;
    backdrop-filter: blur(12px);
}

.heart {
    width: 58px;
    height: 58px;
    margin: 0 auto 14px;
    display: grid;
    place-items: center;
    border-radius: 20px;
    background: #ffe3f0;
    color: var(--pink-strong);
    font-size: 34px;
}

.login-card h1, .topbar h1 {
    margin: 0;
    letter-spacing: -0.03em;
}

.login-card p, .topbar p {
    margin: 8px 0 0;
    color: var(--muted);
}

.login-card form {
    display: grid;
    gap: 12px;
    margin-top: 24px;
}

input[type="password"], textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 14px 16px;
    background: #fffaff;
    color: var(--text);
    outline: none;
}

textarea {
    resize: vertical;
    min-height: 68px;
    max-height: 180px;
}

input:focus, textarea:focus {
    border-color: var(--pink-strong);
    box-shadow: 0 0 0 4px #f7a7c933;
}

button, .logout {
    border: 0;
    border-radius: 18px;
    padding: 13px 18px;
    background: linear-gradient(135deg, var(--pink), var(--pink-strong));
    color: white;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    box-shadow: 0 12px 30px #e875aa33;
}

button:disabled {
    opacity: .65;
    cursor: wait;
}

.error-box {
    margin-top: 18px;
    padding: 10px 12px;
    border-radius: 14px;
    background: #fff0f3;
    color: var(--danger);
    border: 1px solid #ffc4d0;
}

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr auto;
    gap: 16px;
    padding: 20px 0;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 20px;
    border: 1px solid var(--border);
    border-radius: 26px;
    background: var(--panel);
    backdrop-filter: blur(12px);
    box-shadow: 0 16px 50px #e875aa22;
}

.chat {
    overflow-y: auto;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 26px;
    background: #ffffff80;
}

.bubble {
    max-width: 82%;
    margin: 0 0 14px;
    padding: 14px 16px;
    border-radius: 22px;
    border: 1px solid var(--border);
    white-space: pre-wrap;
    line-height: 1.5;
}

.bubble strong {
    display: block;
    margin-bottom: 6px;
    font-size: 0.88rem;
    color: var(--pink-strong);
}

.bubble p { margin: 0; }

.bubble.assistant {
    background: var(--assistant);
    border-top-left-radius: 8px;
}

.bubble.user {
    margin-left: auto;
    background: var(--user);
    border-top-right-radius: 8px;
}

.bubble img {
    display: block;
    max-width: 260px;
    max-height: 220px;
    border-radius: 16px;
    margin-top: 10px;
    object-fit: cover;
}

.composer {
    display: grid;
    grid-template-columns: 140px 1fr auto;
    gap: 12px;
    align-items: end;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 26px;
    background: var(--panel);
    box-shadow: 0 -10px 40px #e875aa18;
    backdrop-filter: blur(12px);
}

.upload-card {
    height: 68px;
    display: grid;
    place-items: center;
    padding: 10px;
    border: 1px dashed var(--pink-strong);
    border-radius: 18px;
    background: #fff5fa;
    color: var(--pink-strong);
    font-weight: 700;
    cursor: pointer;
    text-align: center;
}

.upload-card input { display: none; }

@media (max-width: 720px) {
    .topbar { align-items: flex-start; }
    .composer { grid-template-columns: 1fr; }
    .bubble { max-width: 95%; }
    .logout { padding: 10px 12px; }
}

.top-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.secondary-button {
    background: #fff5fa;
    color: var(--pink-strong);
    border: 1px solid var(--border);
    box-shadow: none;
}

.secondary-button:hover {
    background: #ffe8f3;
}

@media (max-width: 720px) {
    .top-actions { justify-content: flex-start; }
}