/* /style.css */

:root {
    /* Font stacks */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

    /* Base sizes & spacing */
    --font-size-base: 15px;
    --line-height-base: 1.6;
    --border-radius: 6px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --sidebar-width: 300px;
    --header-height: 60px;  /* Approximate */

    /* Light theme */
    --bg-primary: #ffffff;          /* Main content background */
    --bg-secondary: #f8f9fa;        /* Sidebars, headers, footers */
    --bg-tertiary: #e9ecef;         /* Hover states, dividers, code blocks */
    --bg-accent: #007bff;           /* Primary interactive elements */
    --bg-accent-hover: #0056b3;
    --text-primary: #212529;        /* Main text */
    --text-secondary: #6c757d;      /* Subdued text, placeholders */
    --text-accent: #ffffff;         /* Text on accent background */
    --text-link: var(--bg-accent);
    --border-color: #dee2e6;
    --input-bg: var(--bg-primary);
    --input-border: var(--border-color);
    --input-focus-border: #86b7fe;
    --input-focus-shadow: rgba(0, 123, 255, 0.2);
    --shadow-color: rgba(0, 0, 0, 0.08);
    --scrollbar-thumb: #adb5bd;
    --scrollbar-track: var(--bg-tertiary);
    --icon-color: #495057;
    --icon-color-accent: var(--text-accent);
    --success-color: #198754;
    --error-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --code-bg: var(--bg-tertiary);
    --code-text: var(--text-primary);
}

html[data-theme="dark"] {
    --bg-primary: #1a1b26;          /* Main content background */
    --bg-secondary: #24283b;        /* Sidebars, headers, footers */
    --bg-tertiary: #2e334f;         /* Hover states, dividers, code blocks */
    --bg-accent: #7aa2f7;           /* Primary interactive elements */
    --bg-accent-hover: #9dacfc;
    --text-primary: #c0caf5;        /* Main text */
    --text-secondary: #a9b1d6;      /* Subdued text, placeholders */
    --text-accent: #1a1b26;         /* Text on accent background */
    --text-link: var(--bg-accent);
    --border-color: #414868;
    --input-bg: var(--bg-tertiary);
    --input-border: var(--border-color);
    --input-focus-border: #7aa2f7;
    --input-focus-shadow: rgba(122, 162, 247, 0.25);
    --shadow-color: rgba(0, 0, 0, 0.2);
    --scrollbar-thumb: #565f89;
    --scrollbar-track: var(--bg-secondary);
    --icon-color: #a9b1d6;
    --icon-color-accent: var(--text-accent);
    --success-color: #9ece6a;
    --error-color: #f7768e;
    --warning-color: #e0af68;
    --info-color: #7dcfff;
    --code-bg: #1e202e;
    --code-text: var(--text-primary);
}

/* --- Reset & base styles --- */

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

html {
    font-size: var(--font-size-base);
    height: 100%;
    color-scheme: light dark;
    transition: background-color 0.3s ease, color 0.3s ease;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);  /* Fallback/outer background */
    color: var(--text-primary);
    line-height: var(--line-height-base);
    display: flex;
    justify-content: center;
    align-items: center;
    /* min-height: 100dvh; */
    height: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    overflow: hidden;
    transition: background-color 0.3s ease;
}

a {
    color: var(--text-link);
    text-decoration: none;
    transition: color 0.2s ease;
}
a:hover {
    text-decoration: underline;
    color: var(--bg-accent-hover);
}
html[data-theme="dark"] a:hover {
    color: var(--bg-accent-hover);
}

/* --- Main app container --- */

.app-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 1400px;  /* Generous max width */
    height: 90dvh;
    background-color: var(--bg-secondary);  /* Use secondary for main frame */
    border-radius: var(--border-radius);
    box-shadow: 0 5px 20px var(--shadow-color);
    overflow: hidden;
    transition: background-color 0.3s ease;
    border: 1px solid var(--border-color);
}

/* --- Header --- */

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-md);  /* Consistent padding */
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    flex-shrink: 0;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

header * {
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}

header .header-left, header .header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

header .logo {
    font-size: 1.5rem;
    color: var(--text-primary);
    line-height: 1;  /* Prevent extra space */
}

header .version-info {
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

header .status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    background-color: var(--bg-tertiary);
    user-select: none;
    border: 1px solid var(--border-color);  /* Add subtle border */
}
header .status-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    transition: background-color 0.3s ease;
    flex-shrink: 0;
}
header .status-indicator.connected .status-dot { background-color: var(--success-color); }
header .status-indicator.disconnected .status-dot { background-color: var(--error-color); }
header .status-indicator.connecting .status-dot { background-color: var(--warning-color); animation: pulse 1.5s infinite ease-in-out; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* --- Main layout area (sidebar + content) --- */

main {
    display: flex;
    flex-grow: 1;
    overflow: hidden;  /* Prevent content overflow */
    background-color: var(--bg-primary);  /* Main content area background */
}

h2 {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0;
}

/* --- Sidebar --- */

aside {
    width: var(--sidebar-width);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    background-color: var(--bg-secondary);
    transition: background-color 0.3s ease, border-color 0.3s ease, transform 0.3s ease-in-out;
    overflow: hidden;  /* Contains header/search/list */
}

/* .sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
    transition: border-color 0.3s ease;
} */

.search-container {
    display: flex;
    align-items: center;
    justify-content: center;
    height: var(--header-height);
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    transition: border-color 0.3s ease;
}

/* Common list style for sidebars */
.sidebar-list {
    list-style: none;
    overflow-y: auto;
    flex-grow: 1;
    padding: var(--spacing-sm) 0;
    margin: 0;
}
.sidebar-list li {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
    font-size: 0.9rem;
    position: relative;  /* For potential absolute elements like unread count */
}
.sidebar-list li:last-child {
    border-bottom: none;
}
.sidebar-list li:hover {
    background-color: var(--bg-tertiary);
}
.sidebar-list li.active,
.sidebar-list li.selected {  /* Use .active for consistency */
    background-color: var(--bg-accent);
    color: var(--text-accent);
}
.sidebar-list li.active .list-item-secondary,
.sidebar-list li.selected .list-item-secondary {
    color: rgba(255, 255, 255, 0.8);  /* Slightly muted on accent bg */
}
html[data-theme="dark"] .sidebar-list li.active,
html[data-theme="dark"] .sidebar-list li.selected {
    color: var(--text-accent);  /* Ensure contrast */
}
html[data-theme="dark"] .sidebar-list li.active .list-item-secondary,
html[data-theme="dark"] .sidebar-list li.selected .list-item-secondary {
    color: rgba(26, 27, 38, 0.8);  /* Darker muted text */
}

/* --- Common structures --- */

.list-item-main {
    font-weight: 500;
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.list-item-secondary {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.3s ease;
}

/* --- Main content area --- */

section#main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;  /* Contains its own scrolling content */
    padding: var(--spacing-md);
    /* gap: var(--spacing-md); */
}

/* --- Footer --- */

footer {
    font-family: var(--font-mono);
    padding: var(--spacing-sm) var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
    background-color: var(--bg-secondary);
    flex-shrink: 0;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* --- Forms & inputs --- */

input[type="tel"],
input[type="text"],
input[type="search"],
textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius);
    background-color: var(--input-bg);
    color: var(--text-primary);
    font-family: var(--font-sans);  /* Default to sans-serif */
    font-size: 0.95rem;
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
input[type="tel"]:focus,
input[type="text"]:focus,
input[type="search"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
}
input::placeholder,
textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.8;
}
input:disabled,
textarea:disabled {
    background-color: var(--bg-tertiary);
    cursor: not-allowed;
    opacity: 0.7;
}

input[type="search"] {
    border-radius: 20px;  /* Pill shape for search */
    padding-left: calc(var(--spacing-md) + var(--spacing-sm));  /* Space for potential icon */
}

textarea {
    resize: vertical;  /* Allow vertical resize */
    min-height: calc(1.5em * 2 + var(--spacing-sm) * 2);  /* Base height for ~2 lines */
}

/* --- Buttons --- */

button {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: background-color 0.2s ease, opacity 0.2s ease, box-shadow 0.2s ease;
    white-space: nowrap;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--input-border);
}
button:hover {
    opacity: 0.9;
}
button:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
}
button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background-color: var(--bg-tertiary);
    border-color: var(--input-border);
}

/* Primary action button style */
button.primary, .send-button {
    background-color: var(--bg-accent);
    color: var(--text-accent);
    border-color: var(--bg-accent);
}
button.primary:hover, .send-button:hover {
    background-color: var(--bg-accent-hover);
    border-color: var(--bg-accent-hover);
    opacity: 1;
}
button.primary:disabled, .send-button:disabled {
    background-color: var(--bg-accent);  /* Keep color but reduce opacity */
    border-color: var(--bg-accent);
    opacity: 0.6;
}

/* Icon Button */
.icon-button {
    background: none;
    border: none;
    padding: var(--spacing-sm);  /* Slightly larger padding */
    cursor: pointer;
    color: var(--icon-color);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease, color 0.3s ease;
    vertical-align: middle;
    flex-shrink: 0;  /* Prevent shrinking in flex layouts */
    width: 36px;  /* Consistent size */
    height: 36px;
}
.icon-button svg {
    fill: currentColor;
    display: block;
    width: 20px;
    height: 20px;
}
.icon-button:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}
html[data-theme="dark"] .icon-button:hover {
    background-color: var(--bg-tertiary);
}
.icon-button:active, .icon-button:focus {
    outline: none;
    box-shadow: none;
    /* box-shadow: 0 0 0 3px var(--input-focus-shadow); */
}
.icon-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: transparent;
}

/* --- Utility classes --- */

.placeholder-text {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.9rem;
}
.loading-placeholder {
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
    padding: var(--spacing-lg);
}
.error-placeholder {
    color: var(--error-color);
    font-style: normal;
    font-weight: 500;
    text-align: center;
    padding: var(--spacing-lg);
}
.hidden {
    display: none !important;
}
.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    background-color: var(--bg-tertiary);  /* Placeholder */
    flex-shrink: 0;
    border: 1px solid var(--border-color);
}
.flex-row-nowrap {
    display: flex;
    flex-direction: row;
    align-items: center;
}
.flex-column-nowrap {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* --- Scrollbar --- */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: var(--border-radius);
}
::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: var(--border-radius);
    border: 2px solid var(--scrollbar-track);  /* Creates padding */
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}
/* For firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

/* --- Responsiveness (common base) --- */

/* Tablet and smaller desktop */
@media (max-width: 992px) {
    body {
        padding: 0;
    }
    .app-container {
        max-height: none;
        height: 100dvh;
        width: 100vw;
        border-radius: 0;
        border: none;
        box-shadow: none;
    }
    aside {
        --sidebar-width: 260px;  /* Slightly narrower sidebar */
        width: var(--sidebar-width);
    }
}

/* Mobile */
@media (max-width: 767px) {
    aside {
        position: absolute;  /* Change to absolute for overlay/slide */
        left: 0;
        top: 0;
        width: 85%;  /* Don't take full width */
        max-width: var(--sidebar-width);  /* Max width */
        height: 100%;
        z-index: 1000;
        border-right: 1px solid var(--border-color);  /* Keep border */
        transform: translateX(-105%);  /* Start fully hidden */
        box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    }
    html[data-theme="dark"] aside {
        box-shadow: 2px 0 10px rgba(0,0,0,0.3);
    }

    main {
        width: 100%;  /* Ensure main takes full width */
    }

    /* State class to show sidebar */
    .app-container.show-sidebar aside {
        transform: translateX(0);
    }

    /* Overlay for when sidebar is open */
    #sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.4);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
    }
    .app-container.show-sidebar #sidebar-overlay {
        opacity: 1;
        visibility: visible;
    }

    /* Show sidebar toggle */
    .menu-button {
        display: inline-flex !important;  /* Use important to override potential inline styles */
    }

    header .status-text { display: none }
    header .sidebar-toggle { display: none; }

    /* Adjust padding for mobile */
    header { padding: 0 var(--spacing-sm); height: 50px; }
    section#main-content, main.chat-area { padding: var(--spacing-sm); gap: var(--spacing-sm); }
    .sidebar-header { padding: var(--spacing-sm) var(--spacing-md); }
    .search-container { padding: var(--spacing-sm) var(--spacing-md); }
    .sidebar-list li { padding: var(--spacing-sm) var(--spacing-md); }
    footer { padding: var(--spacing-xs) var(--spacing-md); }
}