:root {
    --black: #000000;
    --panel: #04060c;
    --panel-strong: #070b14;
    --panel-soft: #0c1220;
    --navy: #001f54;
    --navy-light: #0b3d91;
    --navy-glow: rgba(11, 61, 145, 0.35);
    --accent: #e8000a;
    --accent-soft: rgba(232, 0, 10, 0.18);
    --accent-glow: rgba(232, 0, 10, 0.12);
    --glass: rgba(255, 255, 255, 0.04);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-strong: rgba(255, 255, 255, 0.13);
    --line: rgba(255, 255, 255, 0.07);
    --line-strong: rgba(255, 255, 255, 0.13);
    --white: #ffffff;
    --muted: #8a96b0;
    --muted-soft: rgba(138, 150, 176, 0.65);
    --text: rgba(230, 235, 245, 0.92);
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.55);
    --shadow-xl: 0 32px 90px rgba(0, 0, 0, 0.68);
    --transition: 160ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 280ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

* {
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
    -ms-overflow-style: none;
}

*::-webkit-scrollbar {
    width: 4px;
    height: 4px;
}

*::-webkit-scrollbar-track {
    background: transparent;
}

*::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 99px;
}

*::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.18);
}

html {
    height: 100%;
    min-height: 100%;
    background: var(--black);
}

body {
    height: 100%;
    min-height: 100vh;
    background:
        radial-gradient(ellipse at 80% -10%, rgba(232, 0, 10, 0.07) 0%, transparent 55%),
        radial-gradient(ellipse at -10% 80%, rgba(0, 31, 84, 0.22) 0%, transparent 55%),
        radial-gradient(ellipse at 50% 50%, rgba(7, 11, 22, 1) 0%, var(--black) 100%);
    color: var(--text);
    font-family: "Poppins", "Segoe UI", Arial, sans-serif;
    letter-spacing: -0.01em;
    overflow: hidden;
}

button,
textarea {
    font: inherit;
}

button {
    color: var(--white);
}

a {
    color: rgba(100, 160, 255, 0.9);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* ============ LAYOUT ============ */

.app-shell {
    display: grid;
    grid-template-columns: 272px minmax(0, 1fr);
    height: 100vh;
    height: 100dvh;
    min-height: 0;
    gap: 0;
    padding: 0;
    overflow: hidden;
    transition: grid-template-columns 200ms var(--transition);
}

.app-shell.sidebar-collapsed {
    grid-template-columns: minmax(0, 1fr);
}

.section-border {
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
}

/* ============ SIDEBAR ============ */

.sidebar {
    display: grid;
    grid-template-rows: auto auto minmax(0, 1fr) auto;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 14px 10px;
    border: 0;
    border-right: 1px solid var(--line);
    border-radius: 0;
    background: rgba(4, 6, 14, 0.97);
    box-shadow: none;
    overflow: hidden;
}

.app-shell.sidebar-collapsed .sidebar {
    display: none;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    min-height: 56px;
    padding: 4px 8px 16px;
}

.sidebar-brand img {
    display: block;
    width: min(180px, 100%);
    height: auto;
    object-fit: contain;
    opacity: 0.95;
    filter: drop-shadow(0 2px 8px rgba(232, 0, 10, 0.15));
}

.sidebar-top {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
    padding-bottom: 14px;
}

/* ============ BUTTONS ============ */

.new-chat-button,
.icon-button,
.recent-chat-button,
.send-button {
    cursor: pointer;
    transition: background var(--transition), box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.new-chat-button {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    min-height: 40px;
    padding: 0 13px;
    border: 1px solid rgba(11, 61, 145, 0.4);
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(11, 61, 145, 0.32), rgba(0, 31, 84, 0.28));
    color: var(--white);
    font-weight: 600;
    font-size: 0.88rem;
    text-align: left;
    letter-spacing: 0;
}

.new-chat-button i {
    font-size: 0.82rem;
    opacity: 0.85;
}

.icon-button {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass);
    color: var(--muted);
    font-size: 0.9rem;
}

.new-chat-button:hover {
    background: linear-gradient(135deg, rgba(11, 61, 145, 0.52), rgba(0, 31, 84, 0.48));
    border-color: rgba(11, 61, 145, 0.7);
    box-shadow: 0 4px 16px rgba(11, 61, 145, 0.25);
    transform: translateY(-1px);
    color: var(--white);
}

.icon-button:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--glass-border-strong);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* ============ RECENTS ============ */

.recents-section {
    min-height: 0;
    padding: 14px 2px 0;
    border-top: 1px solid var(--line);
    background: transparent;
    overflow: auto;
}

.recents-section h2 {
    margin: 0 4px 10px;
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.recent-list {
    display: grid;
    gap: 3px;
}

.recent-chat-row {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    transition: background var(--transition), border-color var(--transition);
}

.recent-chat-row.active,
.recent-chat-row:hover,
.recent-chat-row.menu-open {
    border-color: rgba(232, 0, 10, 0.16);
    background: rgba(11, 61, 145, 0.18);
}

.recent-chat-row.active {
    box-shadow: inset 3px 0 0 var(--accent), inset 0 0 0 1px rgba(232, 0, 10, 0.18);
}

.recent-chat-button {
    display: block;
    width: 100%;
    min-height: 40px;
    padding: 8px 4px 8px 10px;
    border: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    text-align: left;
}

.recent-chat-button:hover {
    background: transparent;
    box-shadow: none;
    transform: none;
}

.recent-chat-title {
    display: block;
    overflow: hidden;
    color: rgba(220, 228, 245, 0.88);
    font-size: 0.86rem;
    font-weight: 500;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.recent-chat-meta,
.empty-recents {
    display: block;
    margin-top: 3px;
    color: var(--muted);
    font-size: 0.70rem;
}

.recent-chat-menu {
    position: relative;
    display: grid;
    place-items: center;
    padding-right: 4px;
}

.recent-menu-button {
    display: grid;
    place-items: center;
    width: 28px;
    height: 28px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font-size: 0.78rem;
    opacity: 0;
    transition: background var(--transition), color var(--transition), opacity var(--transition);
}

.recent-chat-row:hover .recent-menu-button,
.recent-chat-row.active .recent-menu-button,
.recent-chat-row.menu-open .recent-menu-button {
    opacity: 1;
}

.recent-menu-button:hover,
.recent-chat-row.menu-open .recent-menu-button {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.delete-chat-button {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    z-index: 10;
    display: none;
    min-width: 110px;
    min-height: 36px;
    padding: 0 14px;
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--radius-sm);
    background: rgba(16, 20, 32, 0.98);
    color: var(--white);
    cursor: pointer;
    text-align: left;
    font-size: 0.84rem;
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow);
}

.recent-chat-row.menu-open .delete-chat-button {
    display: block;
}

.delete-chat-button:hover {
    border-color: rgba(232, 0, 10, 0.38);
    background: rgba(232, 0, 10, 0.15);
    color: #ffcdd0;
}

.empty-recents {
    padding: 10px 6px;
    line-height: 1.45;
    color: var(--muted);
    font-size: 0.78rem;
}

/* ============ SIDEBAR ACCOUNT ============ */

.sidebar-account {
    position: relative;
    padding-top: 12px;
    border-top: 1px solid var(--line);
}

.sidebar-login-button,
.sidebar-user-button,
.account-menu button {
    width: 100%;
    cursor: pointer;
    font: inherit;
    transition: background var(--transition), border-color var(--transition);
}

.sidebar-login-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 42px;
    border: 1px solid rgba(11, 61, 145, 0.45);
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(11, 61, 145, 0.35), rgba(0, 31, 84, 0.25));
    color: var(--white);
    font-weight: 600;
    font-size: 0.88rem;
}

.sidebar-user-button {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 10px;
    min-height: 50px;
    padding: 8px 10px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass);
    text-align: left;
}

.sidebar-user-avatar {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), rgba(180, 0, 8, 0.9));
    color: var(--white);
    font-size: 0.76rem;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(232, 0, 10, 0.35);
    flex-shrink: 0;
}

.sidebar-user-text {
    min-width: 0;
}

.sidebar-user-text strong,
.sidebar-user-text small {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-user-text strong {
    font-size: 0.86rem;
    font-weight: 600;
    color: var(--white);
}

.sidebar-user-text small {
    margin-top: 2px;
    color: var(--muted);
    font-size: 0.70rem;
    text-transform: capitalize;
}

.account-menu {
    position: absolute;
    left: 0;
    right: 0;
    bottom: calc(100% + 10px);
    z-index: 12;
    display: none;
    gap: 4px;
    padding: 8px;
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--radius);
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(24px);
    box-shadow: var(--shadow-xl);
}

.account-menu.is-open {
    display: grid;
}

.account-menu button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 38px;
    padding: 0 12px;
    border: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    color: rgba(220, 228, 245, 0.88);
    font-size: 0.86rem;
    text-align: left;
}

.account-menu button:hover,
.sidebar-login-button:hover,
.sidebar-user-button:hover {
    background: rgba(11, 61, 145, 0.35);
    border-color: rgba(11, 61, 145, 0.5);
    color: var(--white);
}

.is-hidden {
    display: none !important;
}

/* ============ SIDEBAR REVEAL ============ */

.sidebar-reveal {
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 20;
    display: none;
    width: 38px;
    height: 38px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: rgba(4, 6, 14, 0.9);
    backdrop-filter: blur(12px);
}

.app-shell.sidebar-collapsed .sidebar-reveal {
    display: grid;
}

/* ============ WORKSPACE ============ */

.workspace {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
    height: 100vh;
    height: 100dvh;
    min-height: 0;
    border: 0;
    border-radius: 0;
    background: rgba(3, 5, 11, 0.92);
    box-shadow: none;
    overflow: hidden;
}

/* ============ TOPBAR ============ */

.topbar {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    min-height: 58px;
    padding: 8px 16px;
    border: 0;
    border-bottom: 1px solid var(--line);
    background: rgba(4, 6, 14, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: none;
}

.topbar-actions {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.auth-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    max-width: 160px;
    min-height: 36px;
    padding: 0 14px;
    border: 1px solid rgba(11, 61, 145, 0.45);
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(11, 61, 145, 0.36), rgba(0, 31, 84, 0.28));
    color: var(--white);
    cursor: pointer;
    font-size: 0.84rem;
    font-weight: 600;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.auth-button span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.auth-button:hover,
.auth-button.is-authenticated {
    background: linear-gradient(135deg, rgba(11, 61, 145, 0.6), rgba(0, 31, 84, 0.5));
    border-color: rgba(11, 61, 145, 0.7);
    box-shadow: 0 4px 16px rgba(11, 61, 145, 0.3);
    transform: translateY(-1px);
}

.model-title {
    justify-self: center;
    min-height: 34px;
    padding: 6px 14px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass);
    color: rgba(220, 228, 245, 0.9);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.01em;
    backdrop-filter: blur(8px);
}

.mobile-menu {
    visibility: hidden;
}

/* ============ CHAT STAGE ============ */

.chat-stage {
    position: relative;
    display: grid;
    grid-template-rows: minmax(0, 1fr);
    min-height: 0;
    padding: 24px 20px;
    overflow: hidden;
    isolation: isolate;
}

/* ============ EMPTY STATE ============ */

.empty-state {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 32px;
    pointer-events: none;
}

.empty-state.is-hidden {
    display: none;
}

.empty-state-icon {
    width: 56px;
    height: 56px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(232, 0, 10, 0.18), rgba(11, 61, 145, 0.18));
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 1.5rem;
    animation: pulseFloat 3s ease-in-out infinite;
    box-shadow: 0 8px 24px rgba(232, 0, 10, 0.12), 0 0 0 1px rgba(232, 0, 10, 0.08);
}

@keyframes pulseFloat {
    0%, 100% { transform: translateY(0px); opacity: 0.9; }
    50% { transform: translateY(-6px); opacity: 1; }
}

.empty-state h2 {
    color: rgba(220, 228, 245, 0.88);
    font-size: clamp(1.3rem, 2vw, 1.9rem);
    font-weight: 700;
    text-align: center;
    letter-spacing: -0.02em;
}

.empty-state p {
    color: var(--muted);
    font-size: 0.92rem;
    text-align: center;
    max-width: 360px;
    line-height: 1.55;
}

/* ============ CHAT HISTORY ============ */

.chat-history {
    position: relative;
    z-index: 0;
    width: min(980px, 100%);
    height: 100%;
    min-height: 0;
    margin: 0 auto;
    overflow-y: auto;
    padding: 14px 6px 28px;
    border: 0;
    border-radius: 8px;
    background: transparent;
}

.chat-history:empty {
    border-color: transparent;
    background: transparent;
}

/* ============ SCROLL BOTTOM ============ */

.scroll-bottom-button {
    position: absolute;
    left: 50%;
    bottom: 18px;
    z-index: 4;
    display: grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--glass-border-strong);
    border-radius: 50%;
    background: rgba(7, 11, 22, 0.95);
    backdrop-filter: blur(12px);
    color: var(--muted);
    cursor: pointer;
    font-size: 0.8rem;
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 10px);
    transition: opacity var(--transition), transform var(--transition), background var(--transition), color var(--transition);
    box-shadow: var(--shadow);
}

.scroll-bottom-button.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, 0);
}

.scroll-bottom-button:hover {
    background: rgba(11, 61, 145, 0.6);
    border-color: rgba(11, 61, 145, 0.6);
    color: var(--white);
}

/* ============ MESSAGES ============ */

.message {
    position: relative;
    width: fit-content;
    max-width: min(760px, 88%);
    padding: 14px 16px;
    margin-bottom: 24px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    color: var(--text);
    animation: messageIn 240ms cubic-bezier(0.34, 1.2, 0.64, 1);
    overflow-wrap: anywhere;
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.message-content {
    color: rgba(225, 232, 248, 0.93);
    line-height: 1.65;
    font-size: 0.97rem;
}

.message-content p {
    margin-bottom: 13px;
    white-space: pre-wrap;
}

.message-content p:last-child,
.message-content ul:last-child,
.message-content ol:last-child,
.message-content blockquote:last-child {
    margin-bottom: 0;
}

.message-content h3,
.message-content h4,
.message-content h5 {
    margin: 22px 0 10px;
    color: var(--white);
    font-weight: 700;
    line-height: 1.28;
    letter-spacing: -0.01em;
}

.message-content h3:first-child,
.message-content h4:first-child,
.message-content h5:first-child {
    margin-top: 0;
}

.message-content h3 {
    font-size: 1.12rem;
}

.message-content h4,
.message-content h5 {
    font-size: 1rem;
}

.message-content ul,
.message-content ol {
    margin: 8px 0 15px;
    padding-left: 1.4rem;
}

.message-content li {
    margin: 6px 0;
    padding-left: 2px;
}

.message-content li::marker {
    color: rgba(255, 255, 255, 0.55);
}

.message-content blockquote {
    margin: 14px 0;
    padding: 10px 16px;
    border-left: 3px solid rgba(232, 0, 10, 0.5);
    color: rgba(220, 228, 245, 0.82);
    background: rgba(232, 0, 10, 0.05);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    white-space: pre-wrap;
}

.message-content hr {
    height: 1px;
    margin: 20px 0;
    border: 0;
    background: rgba(255, 255, 255, 0.1);
}

.inline-code {
    display: inline-block;
    padding: 2px 7px;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.09);
    border: 1px solid rgba(255, 255, 255, 0.06);
    color: rgba(190, 210, 255, 0.9);
    font-family: "Fira Code", Consolas, "Courier New", monospace;
    font-size: 0.87em;
    font-weight: 500;
}

.strong-text {
    font-weight: 700;
    color: var(--white);
}

.emphasis-text {
    font-style: italic;
    color: rgba(220, 228, 245, 0.88);
}

/* ============ THINKING / STATUS ============ */

.thinking-status {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    color: var(--muted);
    font-size: 0.93rem;
    font-weight: 600;
}

.thinking-status::after {
    content: "";
    width: 1.4em;
    animation: thinkingDots 1.2s steps(4, end) infinite;
}

@keyframes thinkingDots {
    0%   { content: ""; }
    25%  { content: "."; }
    50%  { content: ".."; }
    75%, 100% { content: "..."; }
}

/* ============ FILE LABEL ============ */

.file-label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 18px 0 8px;
    color: var(--white);
    font-size: 0.96rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.file-label-number {
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 500;
}

/* ============ CODE BLOCKS ============ */

.message-content pre {
    max-height: 430px;
    margin: 0;
    padding: 16px;
    overflow: auto;
    background: #0d1117;
    color: rgba(220, 232, 255, 0.93);
    font-family: "Fira Code", Consolas, "Courier New", monospace;
    font-size: 0.84rem;
    line-height: 1.6;
    white-space: pre;
    tab-size: 2;
}

.message-content pre:last-child {
    margin-bottom: 0;
}

.code-card {
    width: 100%;
    max-width: 860px;
    margin: 18px 0 20px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: var(--radius);
    background: #0d1117;
    box-shadow: var(--shadow);
}

.code-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 40px;
    padding: 0 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    background: rgba(255, 255, 255, 0.03);
    color: var(--muted);
    font-size: 0.76rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.code-card-header .lang-dots {
    display: flex;
    gap: 6px;
    align-items: center;
}

.code-copy-button,
.message-copy-button {
    display: inline-grid;
    place-items: center;
    min-width: 30px;
    height: 30px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font-size: 0.8rem;
    transition: background var(--transition), color var(--transition);
}

.code-copy-button:hover,
.message-copy-button:hover,
.code-copy-button.is-copied,
.message-copy-button.is-copied,
.icon-button.is-copied {
    background: rgba(255, 255, 255, 0.09);
    color: var(--white);
}

.code-copy-button span,
.message-copy-button span,
.icon-button span {
    padding: 0 6px;
    white-space: nowrap;
}

/* ============ USER / AI MESSAGES ============ */

.user-message {
    margin-left: auto;
    max-width: min(720px, 78%);
    padding-right: 44px;
    border-color: rgba(11, 61, 145, 0.35);
    background: linear-gradient(145deg, rgba(11, 61, 145, 0.75) 0%, rgba(0, 31, 84, 0.85) 100%);
    box-shadow: 0 4px 20px rgba(0, 31, 84, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.07);
    line-height: 1.52;
}

.ai-message {
    margin-right: auto;
    width: min(860px, 100%);
    max-width: 100%;
    padding: 0;
    border: 0;
    background: transparent;
}

.message-copy-button {
    position: absolute;
    top: 9px;
    right: 9px;
    opacity: 0;
    transition: opacity var(--transition), background var(--transition);
}

.user-message:hover .message-copy-button,
.message-copy-button.is-copied {
    opacity: 1;
}

.message-time {
    margin-top: 8px;
    color: rgba(138, 150, 176, 0.55);
    font-size: 0.67rem;
    text-align: right;
}

.ai-message .message-time {
    text-align: left;
    opacity: 0.72;
}

.message-time.generating {
    opacity: 1;
    color: rgba(138, 150, 176, 0.5);
    animation: generatingPulse 1.4s ease-in-out infinite;
}

@keyframes generatingPulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.7; }
}

/* ============ COMPOSER ============ */

.composer-section {
    width: min(900px, calc(100% - 48px));
    margin: 0 auto 28px;
    padding: 0;
    border: 0;
    border-radius: var(--radius);
    background: transparent;
    box-shadow: none;
}

.composer {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 8px;
    min-height: 58px;
    padding: 10px 10px 10px 16px;
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--radius-lg);
    background: rgba(7, 10, 20, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.04);
    transition: border-color var(--transition), box-shadow var(--transition);
}

#userInput {
    width: 100%;
    min-height: 40px;
    max-height: 150px;
    padding: 10px 4px;
    resize: none;
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--white);
    font-size: 0.97rem;
    line-height: 1.5;
}

#userInput::placeholder {
    color: var(--muted);
}

#userInput:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.composer:focus-within {
    border-color: rgba(232, 0, 10, 0.4);
    box-shadow: 0 0 0 1px rgba(232, 0, 10, 0.12), 0 20px 50px rgba(0, 0, 0, 0.45);
}

/* ============ SEND BUTTON ============ */

.send-button {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 0;
    background: linear-gradient(135deg, var(--accent), rgba(180, 0, 8, 0.9));
    color: var(--white);
    font-size: 0.9rem;
    box-shadow: 0 4px 16px rgba(232, 0, 10, 0.35);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.send-button:hover:not(:disabled):not(.is-disabled) {
    transform: scale(1.06) translateY(-1px);
    box-shadow: 0 6px 24px rgba(232, 0, 10, 0.5);
    background: linear-gradient(135deg, #ff1a1f, #c00008);
}

.send-button:disabled,
.send-button.is-disabled {
    cursor: not-allowed;
    opacity: 0.45;
    transform: none;
    box-shadow: none;
}

/* ============ TYPING INDICATOR ============ */

.typing-indicator {
    display: none;
    justify-content: center;
    align-items: center;
    gap: 6px;
    padding-bottom: 10px;
}

.typing-indicator span {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    animation: typingBounce 1.1s ease-in-out infinite;
    opacity: 0.8;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.18s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.36s; }

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.45;
    }
    30% {
        transform: translateY(-6px);
        opacity: 1;
    }
}

/* ============ AUTH MODAL ============ */

.auth-modal {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: none;
    place-items: center;
    padding: 20px;
}

.auth-modal.is-open {
    display: grid;
}

.auth-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.auth-dialog {
    position: relative;
    z-index: 1;
    width: min(420px, 100%);
    padding: 28px;
    border: 1px solid rgba(232, 0, 10, 0.2);
    border-radius: var(--radius-lg);
    background: rgba(6, 9, 18, 0.98);
    color: var(--white);
    backdrop-filter: blur(24px);
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.04);
    animation: dialogIn 240ms cubic-bezier(0.34, 1.2, 0.64, 1);
}

@keyframes dialogIn {
    from { opacity: 0; transform: scale(0.96) translateY(8px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

.auth-close-button {
    position: absolute;
    top: 14px;
    right: 14px;
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    background: var(--glass);
    color: var(--muted);
    cursor: pointer;
    font-size: 0.82rem;
    transition: background var(--transition), color var(--transition);
}

.auth-close-button:hover {
    color: var(--white);
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--glass-border-strong);
}

.auth-header {
    padding-right: 38px;
    margin-bottom: 22px;
}

.auth-header h2 {
    margin-bottom: 6px;
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.auth-header p,
.auth-switch-text {
    color: var(--muted);
    font-size: 0.86rem;
    line-height: 1.5;
}

.auth-form {
    display: grid;
    gap: 14px;
}

.auth-form.is-hidden {
    display: none;
}

.auth-form label {
    display: grid;
    gap: 7px;
    color: rgba(200, 212, 235, 0.9);
    font-size: 0.81rem;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.auth-form input {
    width: 100%;
    min-height: 44px;
    padding: 0 14px;
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--radius-sm);
    outline: 0;
    background: rgba(2, 4, 12, 0.98);
    color: var(--white);
    font: inherit;
    font-size: 0.93rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.auth-form input:focus {
    border-color: rgba(232, 0, 10, 0.5);
    box-shadow: 0 0 0 3px rgba(232, 0, 10, 0.1);
}

.auth-submit-button {
    min-height: 44px;
    border: 0;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--accent), rgba(190, 0, 8, 0.9));
    color: var(--white);
    cursor: pointer;
    font-weight: 700;
    font-size: 0.92rem;
    letter-spacing: 0.01em;
    box-shadow: 0 4px 16px rgba(232, 0, 10, 0.3);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.auth-submit-button:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(232, 0, 10, 0.45);
    background: linear-gradient(135deg, #ff1a1f, #c00008);
}

.auth-submit-button:disabled,
.auth-form input:disabled,
.auth-switch-text button:disabled {
    cursor: not-allowed;
    opacity: 0.55;
}

.auth-switch-text {
    text-align: center;
}

.auth-switch-text button {
    border: 0;
    background: transparent;
    color: rgba(180, 200, 255, 0.9);
    cursor: pointer;
    font: inherit;
    font-weight: 600;
    font-size: inherit;
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color var(--transition);
}

.auth-switch-text button:hover {
    color: var(--white);
}

.auth-error {
    display: none;
    margin-top: 14px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    background: rgba(232, 0, 10, 0.1);
    border: 1px solid rgba(232, 0, 10, 0.2);
    color: #ffcdd0;
    font-size: 0.84rem;
    line-height: 1.45;
}

.auth-error.is-visible {
    display: block;
}

.auth-error.is-success {
    background: rgba(0, 200, 80, 0.08);
    border-color: rgba(0, 200, 80, 0.2);
    color: #d7ffd8;
}

/* ============ SETTINGS MODAL ============ */

.settings-modal {
    position: fixed;
    inset: 0;
    z-index: 110;
    display: none;
    place-items: center;
    padding: 20px;
}

.settings-modal.is-open {
    display: grid;
}

.settings-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.settings-dialog {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    width: min(900px, 100%);
    max-height: min(720px, calc(100vh - 40px));
    overflow: hidden;
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--radius-lg);
    background: rgba(8, 11, 20, 0.98);
    backdrop-filter: blur(24px);
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255, 255, 255, 0.04);
    animation: dialogIn 240ms cubic-bezier(0.34, 1.2, 0.64, 1);
}

.settings-close-button {
    position: absolute;
    top: 14px;
    left: 14px;
    z-index: 3;
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    border: 0;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.07);
    color: var(--muted);
    cursor: pointer;
    font-size: 0.82rem;
    transition: background var(--transition), color var(--transition);
}

.settings-close-button:hover {
    color: var(--white);
    background: rgba(255, 255, 255, 0.13);
}

.settings-nav {
    display: grid;
    align-content: start;
    gap: 4px;
    padding: 58px 10px 16px;
    border-right: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.018);
}

.settings-tab {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 38px;
    padding: 0 12px;
    border: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font: inherit;
    font-size: 0.87rem;
    text-align: left;
    transition: background var(--transition), color var(--transition);
}

.settings-tab i {
    font-size: 0.82rem;
    width: 16px;
    text-align: center;
}

.settings-tab.active {
    background: rgba(11, 61, 145, 0.3);
    color: var(--white);
    border: 1px solid rgba(11, 61, 145, 0.35);
}

.settings-tab:hover:not(.active) {
    background: rgba(255, 255, 255, 0.07);
    color: rgba(220, 228, 245, 0.9);
}

.settings-content {
    min-height: 0;
    overflow: auto;
    padding: 28px 32px 32px;
}

.settings-heading {
    margin-bottom: 22px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--line);
}

.settings-heading h2 {
    margin: 0 0 6px;
    font-size: 1.16rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.settings-heading p {
    color: var(--muted);
    font-size: 0.86rem;
}

.settings-panel {
    display: none;
}

.settings-panel.active {
    display: block;
}

.settings-form {
    display: grid;
    gap: 16px;
    max-width: 480px;
}

.settings-form.is-hidden {
    display: none;
}

.quota-readout {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.quota-readout span {
    padding: 6px 12px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass);
    color: var(--muted);
    font-size: 0.82rem;
}

.settings-form label {
    display: grid;
    gap: 7px;
    color: rgba(200, 212, 235, 0.9);
    font-size: 0.83rem;
    font-weight: 600;
}

.settings-form input {
    min-height: 44px;
    padding: 0 14px;
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--radius-sm);
    outline: 0;
    background: rgba(2, 4, 12, 0.98);
    color: var(--white);
    font: inherit;
    font-size: 0.93rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.settings-form input:focus {
    border-color: rgba(232, 0, 10, 0.5);
    box-shadow: 0 0 0 3px rgba(232, 0, 10, 0.1);
}

.settings-save-button {
    width: fit-content;
    min-height: 40px;
    padding: 0 18px;
    border: 0;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--accent), rgba(190, 0, 8, 0.9));
    color: var(--white);
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    font-size: 0.88rem;
    box-shadow: 0 4px 14px rgba(232, 0, 10, 0.3);
    transition: transform var(--transition), box-shadow var(--transition);
}

.settings-save-button:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(232, 0, 10, 0.42);
}

.privacy-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.privacy-actions .settings-save-button {
    width: auto;
    min-width: 150px;
}

.secondary-action {
    background: rgba(255, 255, 255, 0.09);
    box-shadow: none;
    border: 1px solid var(--glass-border);
}

.secondary-action:hover {
    background: rgba(255, 255, 255, 0.14);
    box-shadow: none;
}

.danger-action {
    background: linear-gradient(135deg, #c41c1c, #991414);
    box-shadow: 0 4px 14px rgba(196, 28, 28, 0.3);
}

.danger-action:hover {
    box-shadow: 0 6px 20px rgba(196, 28, 28, 0.45);
}

.settings-message {
    display: none;
    margin-top: 14px;
    padding: 9px 13px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    border: 1px solid transparent;
}

.settings-message.is-visible {
    display: block;
}

.settings-message.is-error {
    background: rgba(232, 0, 10, 0.09);
    border-color: rgba(232, 0, 10, 0.2);
    color: #ffcdd0;
}

.settings-message.is-success {
    background: rgba(0, 200, 80, 0.07);
    border-color: rgba(0, 200, 80, 0.18);
    color: #d7ffd8;
}

/* ============ TABLE ============ */

.settings-table-wrap {
    overflow: auto;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
}

.settings-table {
    width: 100%;
    min-width: 680px;
    border-collapse: collapse;
    font-size: 0.82rem;
}

.settings-table th,
.settings-table td {
    padding: 12px 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    text-align: left;
    vertical-align: top;
}

.settings-table th {
    color: var(--muted);
    font-weight: 600;
    font-size: 0.76rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    background: rgba(255, 255, 255, 0.02);
}

.settings-table tr:last-child td {
    border-bottom: 0;
}

.settings-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.role-pill {
    display: inline-flex;
    padding: 3px 9px;
    border-radius: 99px;
    background: rgba(11, 61, 145, 0.35);
    border: 1px solid rgba(11, 61, 145, 0.4);
    color: rgba(180, 200, 255, 0.9);
    font-size: 0.71rem;
    font-weight: 600;
    text-transform: capitalize;
}

/* ============ USAGE CARDS ============ */

.usage-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

.usage-card {
    padding: 18px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    background: var(--glass);
    transition: background var(--transition), border-color var(--transition);
}

.usage-card:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--glass-border-strong);
}

.usage-card span,
.usage-card strong {
    display: block;
}

.usage-card span {
    color: var(--muted);
    font-size: 0.76rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.usage-card strong {
    margin-top: 8px;
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ============ RESPONSIVE ============ */

@media (max-width: 900px) {
    .app-shell {
        grid-template-columns: minmax(0, 1fr);
        padding: 0;
    }

    .sidebar {
        position: fixed;
        inset: 8px auto 8px 8px;
        z-index: 30;
        width: min(290px, calc(100vw - 16px));
        min-height: auto;
        border: 1px solid var(--glass-border-strong);
        border-radius: var(--radius);
        box-shadow: var(--shadow-xl);
    }

    .app-shell.sidebar-collapsed .sidebar {
        display: none;
    }

    .app-shell:not(.sidebar-collapsed) .workspace {
        pointer-events: none;
        filter: brightness(0.6);
    }

    .mobile-menu {
        visibility: visible;
    }

    .sidebar-reveal,
    .app-shell.sidebar-collapsed .sidebar-reveal,
    .app-shell:not(.sidebar-collapsed) .sidebar-reveal {
        display: none;
    }

    .workspace {
        min-height: 100vh;
        min-height: 100dvh;
        border-radius: 0;
    }

    .chat-stage {
        padding: 18px 12px;
    }

    .chat-history {
        width: 100%;
        padding-inline: 2px;
    }

    .code-card {
        width: 100%;
        max-width: 100%;
    }
}

@media (max-width: 640px) {
    .topbar {
        min-height: 54px;
        padding: 6px 10px;
    }

    .model-title {
        min-height: 32px;
        padding: 5px 10px;
        font-size: 0.85rem;
    }

    .chat-stage {
        padding: 12px 8px;
    }

    .composer-section {
        width: calc(100% - 12px);
        margin-bottom: max(12px, env(safe-area-inset-bottom));
        padding: 0;
    }

    .auth-button {
        display: none;
    }

    .settings-modal {
        padding: 10px;
    }

    .settings-dialog {
        grid-template-columns: 1fr;
        max-height: calc(100vh - 20px);
    }

    .settings-nav {
        display: flex;
        gap: 6px;
        overflow-x: auto;
        padding: 52px 10px 10px;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .settings-tab {
        flex: 0 0 auto;
        min-height: 34px;
        padding: 0 10px;
        font-size: 0.8rem;
    }

    .settings-content {
        padding: 16px 18px;
    }

    .settings-table {
        min-width: 640px;
    }

    .message {
        max-width: 100%;
        font-size: 0.92rem;
    }

    .message-content {
        font-size: 0.92rem;
        line-height: 1.58;
    }

    .message-content ul,
    .message-content ol {
        padding-left: 1.15rem;
    }

    .user-message {
        max-width: 90%;
    }

    .ai-message {
        width: 100%;
    }

    .message-content pre {
        max-height: 360px;
        font-size: 0.78rem;
        padding: 12px;
    }

    .topbar-actions {
        gap: 4px;
    }

    .topbar-actions .icon-button {
        width: 34px;
        height: 34px;
    }

    .icon-button {
        width: 36px;
        height: 36px;
    }

    .composer {
        min-height: 54px;
        padding: 8px 8px 8px 14px;
    }

    .send-button {
        width: 38px;
        height: 38px;
    }

    .empty-state h2 {
        font-size: 1.25rem;
    }

    .empty-state p {
        font-size: 0.86rem;
    }
}