:root {
    color-scheme: dark;
    --bg-page: #0f1117;
    --bg-main: #171a22;
    --bg-main-soft: #1d2029;
    --bg-sidebar: #11131a;
    --bg-sidebar-soft: #171a22;
    --bg-hover: #222632;
    --bg-active: #282d3a;
    --bg-input: rgba(35, 39, 51, 0.92);
    --bg-code: #0b0e14;
    --bg-code-top: #111722;
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.14);
    --text-primary: #f4f7fb;
    --text-secondary: #b7bfcc;
    --text-muted: #808999;
    --accent: #19c37d;
    --accent-hover: #22d38b;
    --accent-soft: rgba(25, 195, 125, 0.13);
    --danger: #ff7a7a;
    --danger-soft: rgba(255, 122, 122, 0.13);
    --shadow-soft: 0 24px 80px rgba(0, 0, 0, 0.34);
    --shadow-glow: 0 0 0 1px rgba(255, 255, 255, 0.03), 0 18px 60px rgba(0, 0, 0, 0.22);
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --content-width: 840px;
    --transition: 0.25s ease;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body.auth-locked {
    overflow: hidden;
}

body {
    margin: 0;
    display: flex;
    overflow: hidden;
    color: var(--text-primary);
    background:
        radial-gradient(circle at 15% 0%, rgba(25, 195, 125, 0.08), transparent 30%),
        radial-gradient(circle at 85% 8%, rgba(117, 119, 255, 0.07), transparent 32%),
        var(--bg-page);
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    letter-spacing: 0;
}

button,
input {
    font: inherit;
}

button {
    -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
input:focus-visible {
    outline: 2px solid rgba(25, 195, 125, 0.75);
    outline-offset: 2px;
}

/* Sidebar */
#sidebar {
    width: 292px;
    display: flex;
    flex-direction: column;
    padding: 18px 14px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.035), transparent 18%),
        linear-gradient(180deg, var(--bg-sidebar-soft), var(--bg-sidebar));
    border-right: 1px solid var(--border-subtle);
    box-shadow: 12px 0 40px rgba(0, 0, 0, 0.18);
}

.btn-sidebar {
    width: 100%;
    margin-bottom: 18px;
    padding: 13px 15px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.045);
    text-align: left;
    cursor: pointer;
    transition: background-color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-sidebar:hover {
    transform: translateY(-1px);
    border-color: var(--border-strong);
    background: rgba(255, 255, 255, 0.075);
    box-shadow: var(--shadow-glow);
}

#chat-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 7px;
    min-height: 0;
    overflow-y: auto;
    padding-right: 2px;
}

#chat-list::-webkit-scrollbar,
#chat-container::-webkit-scrollbar,
.code-block::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

#chat-list::-webkit-scrollbar-thumb,
#chat-container::-webkit-scrollbar-thumb,
.code-block::-webkit-scrollbar-thumb {
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.16);
}

.chat-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 8px;
    min-height: 44px;
    padding: 7px 7px 7px 13px;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.chat-item:hover {
    transform: translateX(2px);
    border-color: rgba(255, 255, 255, 0.08);
    background: var(--bg-hover);
}

.chat-item.active {
    border-color: rgba(25, 195, 125, 0.28);
    background:
        linear-gradient(90deg, rgba(25, 195, 125, 0.12), transparent 80%),
        var(--bg-active);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.chat-title {
    min-width: 0;
    overflow: hidden;
    color: var(--text-secondary);
    font-size: 0.92rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chat-item.active .chat-title,
.chat-item:hover .chat-title {
    color: var(--text-primary);
}

.chat-actions {
    display: flex;
    gap: 4px;
    opacity: 0.52;
    transition: opacity var(--transition);
}

.chat-item:hover .chat-actions,
.chat-item.active .chat-actions {
    opacity: 1;
}

.icon-btn {
    width: 31px;
    height: 31px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    background: transparent;
    cursor: pointer;
    transition: background-color var(--transition), color var(--transition), transform var(--transition);
}

.edit-btn {
    opacity: 0;
    transform: scale(0.92);
    pointer-events: none;
}

.chat-item:hover .edit-btn {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}

.icon-btn:hover {
    transform: translateY(-1px);
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
}

.icon-btn.pinned {
    color: var(--accent);
    background: var(--accent-soft);
}

.icon-btn.danger:hover {
    color: var(--danger);
    background: var(--danger-soft);
}

.api-box {
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--border-subtle);
}

.api-box label {
    display: block;
    margin: 0 0 9px;
    color: var(--text-muted);
    font-size: 0.78rem;
}

.api-box input {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    background: rgba(6, 8, 12, 0.72);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.api-box input:focus {
    border-color: rgba(25, 195, 125, 0.62);
    background: rgba(6, 8, 12, 0.88);
    box-shadow: 0 0 0 4px rgba(25, 195, 125, 0.1);
}

#logout-btn {
    margin: 12px 0 0;
    padding: 10px 12px;
    font-size: 0.86rem;
}

/* Chat layout */
#main-content {
    position: relative;
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    height: 100%;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 22%),
        var(--bg-main);
}

#main-content::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image: linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px);
    background-size: 100% 72px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.45), transparent 70%);
}

#chat-container {
    position: relative;
    z-index: 1;
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    scroll-behavior: smooth;
}

.message-wrapper {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 26px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.045);
    animation: messageIn 0.25s ease;
}

.message-wrapper.user {
    background: rgba(18, 21, 29, 0.34);
}

.message-wrapper.ai {
    background: rgba(255, 255, 255, 0.028);
}

.message-content {
    width: 100%;
    max-width: var(--content-width);
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 18px;
    line-height: 1.72;
    word-wrap: break-word;
}

.avatar {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.025));
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
    font-size: 1rem;
    user-select: none;
}

.message-body {
    min-width: 0;
}

.message-text {
    color: var(--text-primary);
    white-space: normal;
}

.message-actions {
    margin-top: 14px;
    display: flex;
    gap: 8px;
}

.btn-regenerate {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.04);
    cursor: pointer;
    transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-regenerate:hover {
    transform: translateY(-1px);
    border-color: rgba(25, 195, 125, 0.34);
    color: var(--text-primary);
    background: var(--accent-soft);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
}

/* Code blocks */
.code-block {
    position: relative;
    max-width: 100%;
    margin: 16px 0;
    padding: 44px 18px 18px;
    overflow: auto;
    border: 1px solid rgba(147, 160, 184, 0.18);
    border-radius: 16px;
    color: #e7edf7;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.035), transparent 22%),
        var(--bg-code);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 14px 40px rgba(0, 0, 0, 0.18);
    white-space: pre;
}

.code-block code {
    font-family: "Cascadia Code", Consolas, Monaco, "SFMono-Regular", Menlo, monospace;
    font-size: 0.9rem;
    line-height: 1.65;
}

.code-label {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    padding: 9px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: 16px 16px 0 0;
    color: #aeb8c8;
    background: var(--bg-code-top);
    font-family: "Cascadia Code", Consolas, Monaco, monospace;
    font-size: 0.72rem;
    letter-spacing: 0;
    text-transform: uppercase;
}

.inline-code {
    padding: 0.14rem 0.38rem;
    border: 1px solid rgba(147, 160, 184, 0.18);
    border-radius: 7px;
    color: #f5f8ff;
    background: rgba(8, 11, 17, 0.78);
    font-family: "Cascadia Code", Consolas, Monaco, monospace;
    font-size: 0.92em;
}

/* Loading state */
.typing-indicator {
    min-height: 30px;
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

.typing-indicator span {
    width: 7px;
    height: 7px;
    display: block;
    border-radius: 999px;
    background: var(--text-secondary);
    animation: typingPulse 1.15s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.15s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.3s;
}

/* Composer */
#input-container {
    position: relative;
    z-index: 2;
    display: flex;
    justify-content: center;
    padding: 24px;
    background: linear-gradient(180deg, rgba(23, 26, 34, 0), var(--bg-main) 44%);
}

.input-box {
    width: 100%;
    max-width: var(--content-width);
    display: flex;
    align-items: center;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    background: var(--bg-input);
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(16px);
    transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition), transform var(--transition);
}

.input-box:focus-within {
    transform: translateY(-1px);
    border-color: rgba(25, 195, 125, 0.45);
    background: rgba(39, 44, 57, 0.96);
    box-shadow: 0 24px 90px rgba(0, 0, 0, 0.38), 0 0 0 4px rgba(25, 195, 125, 0.1);
}

#user-input {
    width: 100%;
    padding: 17px 18px;
    border: 0;
    color: var(--text-primary);
    background: transparent;
    font-size: 1rem;
    outline: none;
}

#user-input::placeholder {
    color: var(--text-muted);
}

.btn-send {
    width: 44px;
    height: 44px;
    flex: 0 0 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: 7px;
    border: 0;
    border-radius: 14px;
    color: #06110d;
    background: linear-gradient(180deg, var(--accent-hover), var(--accent));
    box-shadow: 0 12px 28px rgba(25, 195, 125, 0.24);
    cursor: pointer;
    transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.btn-send:hover {
    transform: translateY(-1px);
    filter: brightness(1.05);
    box-shadow: 0 16px 34px rgba(25, 195, 125, 0.32);
}

.btn-send.stop {
    color: white;
    background: linear-gradient(180deg, #f97316, #c2410c);
    box-shadow: 0 12px 28px rgba(249, 115, 22, 0.24);
}

.btn-send.stop:hover {
    box-shadow: 0 16px 34px rgba(249, 115, 22, 0.32);
}

/* Modal */
.modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
    background: rgba(6, 8, 12, 0.62);
    backdrop-filter: blur(7px);
    transition: opacity var(--transition), visibility var(--transition);
}

.modal-backdrop.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.modal-card {
    width: min(480px, 100%);
    padding: 20px;
    border: 1px solid var(--border-strong);
    border-radius: 18px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.015)), var(--bg-main-soft);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.42);
}

.modal-card h2 {
    margin: 0 0 14px;
    font-size: 1.03rem;
    color: var(--text-primary);
}

.auth-status {
    min-height: 20px;
    margin: 10px 0 0;
    color: var(--text-secondary);
    font-size: 0.82rem;
}

.modal-card label {
    display: block;
    margin: 10px 0 7px;
    font-size: 0.84rem;
    color: var(--text-secondary);
}

.modal-card input {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    color: var(--text-primary);
    background: rgba(11, 14, 20, 0.9);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.modal-card input:focus {
    border-color: rgba(25, 195, 125, 0.65);
    box-shadow: 0 0 0 4px rgba(25, 195, 125, 0.12);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 16px;
}

.modal-btn {
    height: 38px;
    padding: 0 14px;
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
    cursor: pointer;
    transition: background-color var(--transition), border-color var(--transition), transform var(--transition);
}

.modal-btn:hover {
    transform: translateY(-1px);
    border-color: var(--border-strong);
    background: rgba(255, 255, 255, 0.08);
}

.modal-btn.primary {
    border-color: rgba(25, 195, 125, 0.32);
    color: #07150f;
    background: linear-gradient(180deg, var(--accent-hover), var(--accent));
}

.modal-btn.danger {
    border-color: rgba(255, 122, 122, 0.4);
    color: #210707;
    background: linear-gradient(180deg, #ff9a9a, #ff7a7a);
}

/* Motion */
@keyframes typingPulse {
    0%,
    80%,
    100% {
        opacity: 0.34;
        transform: translateY(0) scale(0.82);
    }
    40% {
        opacity: 1;
        transform: translateY(-3px) scale(1);
    }
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}

/* Responsive */
@media (max-width: 760px) {
    body {
        flex-direction: column;
        overflow: auto;
    }

    #sidebar {
        width: 100%;
        max-height: 40vh;
        border-right: 0;
        border-bottom: 1px solid var(--border-subtle);
        padding: 14px 12px;
    }

    .message-wrapper {
        padding: 22px 16px;
    }

    .message-content {
        grid-template-columns: 34px minmax(0, 1fr);
        gap: 13px;
    }

    .avatar {
        width: 34px;
        height: 34px;
    }

    #input-container {
        padding: 12px 12px calc(12px + env(safe-area-inset-bottom));
    }

    #user-input {
        padding: 15px 14px;
        font-size: 0.97rem;
    }

    .btn-send {
        width: 42px;
        height: 42px;
        flex: 0 0 42px;
        margin-right: 6px;
    }

    .modal-backdrop {
        align-items: flex-end;
        padding: 10px;
    }

    .modal-card {
        width: 100%;
        border-radius: 16px;
        padding: 16px;
    }
}

@media (hover: none) and (pointer: coarse) {
    .chat-actions {
        opacity: 1;
    }

    .edit-btn {
        opacity: 1;
        transform: scale(1);
        pointer-events: auto;
    }

    .chat-item {
        min-height: 48px;
    }

    .icon-btn {
        width: 34px;
        height: 34px;
    }
}