:root {
    --bg-color: #212121;
    --sidebar-bg: #171717;
    --chat-item-bg-hover: #2f2f2f;
    --text-primary: #ececec;
    --text-secondary: #b4b4b4;
    --input-bg: #2f2f2f;
    --border-color: #424242;
    --user-msg-bg: #2f2f2f;
    --ai-msg-bg: transparent;
    --accent: #10a37f;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100dvh;
    overflow: hidden;
}

/* App Layout */
.app-layout {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Sidebar Styling */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    height: 100%;
    border-right: 1px solid var(--border-color);
    transition: width 0.3s ease, opacity 0.3s ease;
    flex-shrink: 0;
    overflow-x: hidden;
}

@media (min-width: 769px) {
    .sidebar.collapsed {
        width: 0;
        border-right: none;
        opacity: 0;
        pointer-events: none;
    }

    .sidebar.collapsed+.main-content #sidebar-show-btn {
        display: flex;
    }
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px;
}

.sidebar-toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.sidebar-toggle-btn:hover {
    background-color: var(--chat-item-bg-hover);
    color: var(--text-primary);
}

#sidebar-show-btn {
    display: none;
}

.btn-new-chat {
    flex: 1;
    padding: 10px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background-color 0.2s;
}

.btn-new-chat:hover {
    background-color: var(--chat-item-bg-hover);
}

.conversation-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.conversation-item {
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: background-color 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    height: 40px;
}

.conversation-item:hover {
    background-color: var(--chat-item-bg-hover);
}

.conversation-item.active {
    background-color: var(--chat-item-bg-hover);
}

.conversation-item .btn-delete {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0 5px;
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
}

.conversation-item:hover .btn-delete {
    display: block;
}

.conversation-item .btn-delete:hover {
    color: #ff4d4d;
}

.conv-title {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: 20px;
}

.sidebar-footer {
    padding: 15px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.nav-link-sidebar {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 5px;
    border-radius: 5px;
    transition: background-color 0.2s;
}

.nav-link-sidebar:hover {
    background-color: var(--chat-item-bg-hover);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    min-width: 0;
    position: relative;
    background-color: var(--bg-color);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.header-controls-left {
    display: flex;
    gap: 10px;
    align-items: center;
}

.header-controls {
    display: flex;
    gap: 15px;
    align-items: center;
}

/* Chat Area */
.chat-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    /* Center content in main area */
}

.chat-display {
    flex: 1;
    overflow-y: auto;
    padding: 20px 20px 120px 20px;
    display: flex;
    flex-direction: column;
}

.chat-message {
    padding: 24px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 1rem;
    line-height: 1.6;
    display: block;
}

.chat-message:last-child {
    border-bottom: none;
}

.user-message,
.ai-message {
    color: var(--text-primary);
}

/* Input Area */
.input-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background-image: linear-gradient(180deg, rgba(33, 33, 33, 0), #212121 20%);
    padding: 20px 20px calc(20px + env(safe-area-inset-bottom));
}

.chat-input-group {
    max-width: 768px;
    margin: 0 auto;
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 26px;
    /* Pill style */
    padding: 6px 12px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

.chat-input-group:focus-within {
    border-color: var(--text-secondary);
}

.chat-input {
    flex-grow: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 10px 12px;
    font-family: inherit;
    font-size: 1rem;
    outline: none;
    max-height: 200px;
    min-height: 44px;
    resize: none;
    line-height: 1.5;
}

.btn-send,
.btn-voice,
.btn-plus {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    color: var(--text-secondary);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
}

.btn-send {
    background-color: var(--text-primary);
    color: var(--bg-color);
    margin-left: 4px;
}

.btn-send:hover {
    opacity: 0.8;
}

.btn-send:disabled {
    background-color: var(--border-color);
    color: var(--text-secondary);
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-voice:hover,
.btn-plus:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

#voice-status {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-bottom: 10px;
    background: #333;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.8rem;
    white-space: nowrap;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background-color: #424242;
    border-radius: 4px;
}

/* Shared Components & Markdown */
.status-badge {
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

#model-selector {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    padding: 2px 5px;
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
}

/* Markdown Styling */
.chat-message h1,
.chat-message h2,
.chat-message h3,
.chat-message h4 {
    margin: 10px 0;
    color: var(--text-primary);
}

.chat-message p {
    margin-bottom: 10px;
}

.chat-message ul,
.chat-message ol {
    margin-left: 20px;
    margin-bottom: 10px;
}

.chat-message code {
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 4px;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
}

.chat-message pre {
    background: #000;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 10px 0;
    border: 1px solid var(--border-color);
}

.chat-message pre code {
    background: transparent;
    padding: 0;
    display: block;
    color: #e6e6e6;
}

.chat-message blockquote {
    border-left: 4px solid var(--accent);
    padding-left: 15px;
    margin: 10px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.chat-message table {
    border-collapse: collapse;
    width: 100%;
    margin: 10px 0;
}

.chat-message th,
.chat-message td {
    border: 1px solid var(--border-color);
    padding: 8px;
    text-align: left;
}

.chat-message th {
    background: rgba(255, 255, 255, 0.05);
}

.card {
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
}

/* Login & Settings helpers */
.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.login-card {
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    padding: 40px;
    border-radius: 12px;
    width: 100%;
    max-width: 400px;
}

.form-input {
    width: 100%;
    padding: 10px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}

.btn-primary {
    background-color: var(--accent);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        z-index: 100;
        transform: translateX(-100%);
        width: 80%;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: block;
    }
}