:root {
    --bg: #f2f5fa;
    --surface: #ffffff;
    --ink: #162133;
    --muted: #5f6b80;
    --line: #d7deea;
    --brand: #087443;
    --brand-2: #065f3a;
    --danger: #b42318;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #f7faff 0%, var(--bg) 60%);
}

.chat-page {
    height: 100vh;
    overflow: hidden;
}

h1,
h2,
h3,
p {
    margin: 0;
}

.muted {
    color: var(--muted);
}

.small {
    font-size: 0.86rem;
}

.stack {
    display: grid;
    gap: 0.65rem;
}

input,
textarea,
button {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    font-size: 1rem;
    padding: 0.65rem 0.75rem;
}

button {
    border: none;
    background: linear-gradient(130deg, var(--brand), var(--brand-2));
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.secondary {
    background: #e9eef8;
    color: var(--ink);
}

.slim {
    width: auto;
    padding: 0.5rem 0.7rem;
}

.success {
    color: #0a7a44;
}

.error {
    color: var(--danger);
}

.hidden {
    display: none;
}

.auth-wrap {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 1rem;
}

.auth-card {
    width: min(900px, 100%);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 1.1rem;
    box-shadow: 0 20px 40px rgba(22, 33, 51, 0.08);
    display: grid;
    gap: 0.8rem;
}

.auth-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.9rem;
}

.auth-grid form {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0.85rem;
    background: #fbfdff;
}

.password-wrap {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.45rem;
    align-items: center;
}

.toggle-pass {
    width: auto;
    min-width: 62px;
    padding: 0.65rem 0.7rem;
    background: #e9eef8;
    color: var(--ink);
    border: 1px solid var(--line);
}

.chat-app {
    width: min(1120px, 100%);
    height: 100vh;
    margin: 0 auto;
    padding: 0.7rem;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 0.7rem;
    overflow: hidden;
}

.chat-sidebar,
.chat-main {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 0.8rem;
    min-height: 0;
    overflow: hidden;
}

.chat-sidebar {
    display: grid;
    grid-template-rows: auto auto 1fr;
    gap: 0.7rem;
}

.sidebar-head {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: 0.6rem;
}

.chat-list {
    overflow-y: auto;
    display: grid;
    gap: 0.45rem;
    align-content: start;
}

.chat-item {
    text-align: left;
    background: #f4f7fd;
    color: var(--ink);
    border: 1px solid var(--line);
    display: grid;
    gap: 0.2rem;
}

.chat-item.active {
    border-color: #98b5e8;
    background: #eaf1ff;
}

.chat-main {
    display: grid;
    grid-template-rows: auto 1fr auto;
    gap: 0.7rem;
}

.chat-main-head {
    border-bottom: 1px solid var(--line);
    padding-bottom: 0.5rem;
}

.chat-head-row {
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

.mobile-only {
    display: none;
}

.chat-empty {
    border: 1px dashed var(--line);
    border-radius: 8px;
    background: #fcfdff;
    display: grid;
    align-content: center;
    justify-items: center;
    gap: 0.55rem;
    text-align: center;
    padding: 1rem;
}

.chat-empty.hidden {
    display: none;
}

.chat-empty h3 {
    font-size: 1.1rem;
}

.chat-conversation {
    display: grid;
    grid-template-rows: 1fr auto;
    gap: 0.7rem;
    min-height: 0;
    overflow: hidden;
}

.chat-conversation.hidden {
    display: none;
}

.chat-log {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0.65rem;
    overflow-y: auto;
    display: grid;
    gap: 0.45rem;
    align-content: start;
    background: #fcfdff;
    min-height: 0;
}

.msg {
    max-width: 78%;
    padding: 0.45rem 0.65rem;
    border-radius: 8px;
    line-height: 1.35;
    word-break: break-word;
}

.incoming {
    justify-self: start;
    background: #e8f0ff;
}

.outgoing {
    justify-self: end;
    background: #d8f3e2;
}

.msg img {
    max-width: 100%;
    max-height: 250px;
    object-fit: cover;
    border-radius: 8px;
    display: block;
}

.chat-form {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0.65rem;
    display: grid;
    gap: 0.65rem;
}

.chat-actions {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.6rem;
    align-items: center;
}

.chat-actions button {
    width: auto;
    min-width: 96px;
}

.modal {
    position: fixed;
    inset: 0;
    background: rgba(20, 28, 43, 0.5);
    display: grid;
    place-items: center;
    padding: 1rem;
}

.modal.hidden {
    display: none;
}

.modal-card {
    width: min(560px, 100%);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 0.9rem;
    display: grid;
    gap: 0.7rem;
}

.modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.search-results {
    min-height: 80px;
    max-height: 320px;
    overflow-y: auto;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0.5rem;
    display: grid;
    gap: 0.5rem;
    align-content: start;
}

.search-row {
    text-align: left;
    background: #f4f7fd;
    color: var(--ink);
    border: 1px solid var(--line);
}

@media (max-width: 900px) {
    .chat-page {
        height: auto;
        overflow: auto;
    }

    .chat-app {
        grid-template-columns: 1fr;
        height: auto;
        min-height: 100vh;
        padding: 0.45rem;
        overflow: visible;
    }

    .chat-sidebar,
    .chat-main {
        min-height: 0;
    }

    .chat-sidebar {
        grid-template-rows: auto auto minmax(0, 1fr);
        max-height: 42vh;
    }

    .chat-list {
        max-height: none;
        min-height: 0;
        overflow-y: auto;
    }

    .mobile-only {
        display: inline-flex;
    }

    .chat-app.mobile-sidebar-collapsed .chat-sidebar {
        display: none;
    }
}

@media (max-width: 760px) {
    .auth-grid {
        grid-template-columns: 1fr;
    }

    .chat-actions {
        grid-template-columns: 1fr;
    }

    .chat-actions button {
        width: 100%;
    }

    .msg {
        max-width: 90%;
    }
}