/* Catppuccin Latte (light) */
:root {
    --bg:               #e6e9ef; /* Mantle */
    --surface:          #eff1f5; /* Base */
    --sidebar-bg:       #e6e9ef; /* Mantle */
    --border:           #ccd0da; /* Surface0 */
    --text:             #4c4f69; /* Text */
    --text-muted:       #8c8fa1; /* Overlay1 */
    --input-bg:         #eff1f5; /* Base */
    --input-border:     #bcc0cc; /* Surface1 */
    --user-hover:       #ccd0da; /* Surface0 */
    --reload-bg:        #dce0e8; /* Crust */
    --reload-border:    #bcc0cc; /* Surface1 */
    --reload-hover:     #ccd0da; /* Surface0 */
    --msg-received-bg:  #ccd0da; /* Surface0 */
    --msg-received-text:#4c4f69; /* Text */
    --error-bg:         #f2cdcd; /* Flamingo tint */
    --error-text:       #d20f39; /* Red */
    --accent:           #1e66f5; /* Blue */
    --accent-hover:     #04a5e5; /* Sky */
    --accent-text:      #eff1f5; /* Base */
}

/* Catppuccin Mocha (dark) */
[data-theme="dark"] {
    --bg:               #181825; /* Mantle */
    --surface:          #1e1e2e; /* Base */
    --sidebar-bg:       #181825; /* Mantle */
    --border:           #313244; /* Surface0 */
    --text:             #cdd6f4; /* Text */
    --text-muted:       #6c7086; /* Overlay0 */
    --input-bg:         #1e1e2e; /* Base */
    --input-border:     #45475a; /* Surface1 */
    --user-hover:       #313244; /* Surface0 */
    --reload-bg:        #313244; /* Surface0 */
    --reload-border:    #45475a; /* Surface1 */
    --reload-hover:     #45475a; /* Surface1 */
    --msg-received-bg:  #313244; /* Surface0 */
    --msg-received-text:#cdd6f4; /* Text */
    --error-bg:         #3b1b27; /* custom deep red */
    --error-text:       #f38ba8; /* Red */
    --accent:           #89b4fa; /* Blue */
    --accent-hover:     #74c7ec; /* Sapphire */
    --accent-text:      #1e1e2e; /* Base */
}

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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem;
    transition: background 0.2s, color 0.2s;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

#theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 0.35rem 0.75rem;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
    z-index: 100;
}

#theme-toggle:hover {
    background: var(--user-hover);
}

.auth-container {
    width: 100%;
    max-width: 440px;
}

.auth-section {
    background: var(--surface);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
    transition: background 0.2s;
}

.auth-section h2 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
    color: var(--text);
}

form {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

input, select {
    padding: 0.6rem 0.8rem;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    font-size: 0.95rem;
    transition: border-color 0.2s, background 0.2s, color 0.2s;
    background: var(--input-bg);
    color: var(--text);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent);
}

button[type="submit"] {
    padding: 0.6rem;
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.2s;
}

button[type="submit"]:hover {
    background: var(--accent-hover);
}

.chat-app {
    display: flex;
    width: 100%;
    max-width: 900px;
    height: 80vh;
    background: var(--surface);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.12);
    transition: background 0.2s;
}

#user-list {
    width: 220px;
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 1rem;
    background: var(--sidebar-bg);
    transition: background 0.2s, border-color 0.2s;
}

#user-list h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
}

.user-item {
    padding: 0.6rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text);
    transition: background 0.15s;
}

.user-item:hover {
    background: var(--user-hover);
}

.user-item.active {
    background: var(--accent);
    color: var(--accent-text);
}

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text);
    transition: background 0.2s, border-color 0.2s;
}

.chat-header button {
    padding: 0.3rem 0.8rem;
    font-size: 0.8rem;
    background: var(--reload-bg);
    color: var(--text);
    border: 1px solid var(--reload-border);
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.15s;
}

.chat-header button:hover {
    background: var(--reload-hover);
}

#messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.message {
    max-width: 70%;
    width: fit-content;
    padding: 8px 12px;
    border-radius: 12px;
    font-size: 0.95rem;
    line-height: 1.4;
    word-break: break-word;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.message-time {
    font-size: 0.7rem;
    opacity: 0.65;
}

.sent {
    align-self: flex-end;
    background: var(--accent);
    color: var(--accent-text);
    border-bottom-right-radius: 4px;
}

.received {
    align-self: flex-start;
    background: var(--msg-received-bg);
    color: var(--msg-received-text);
    border-bottom-left-radius: 4px;
}

.message-form {
    display: flex;
    padding: 0.8rem;
    border-top: 1px solid var(--border);
    gap: 0.5rem;
}

.message-form input {
    flex: 1;
    border-radius: 20px;
}

.message-form button {
    border-radius: 20px;
    padding: 0.6rem 1.2rem;
}

.error-message {
    background: var(--error-bg);
    color: var(--error-text);
    padding: 0.6rem 1rem;
    border-radius: 6px;
    margin-top: 0.5rem;
    font-size: 0.9rem;
}