/* Importing a modern font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

:root {
    --bg-body: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-hover: #f8fafc;
    --border: #e2e8f0;
    --border-input: #cbd5e1;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-heading: #0f172a;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-light: #e0f2fe;
    --accent-text: #0284c7;
    --bubble-self: #f1f5f9;
    --bubble-self-border: #f1f5f9;
    --danger-bg: #fee2e2;
    --danger-text: #dc2626;
    --danger-hover: #fecaca;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --scrollbar: #cbd5e1;
    --focus-ring: rgba(37, 99, 235, 0.1);
    --menu-bg: #ffffff;
}

.dark {
    --bg-body: #0f172a;
    --bg-surface: #1e293b;
    --bg-surface-hover: #334155;
    --border: #334155;
    --border-input: #475569;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-heading: #f1f5f9;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --accent-light: #1e3a5f;
    --accent-text: #7dd3fc;
    --bubble-self: #334155;
    --bubble-self-border: #334155;
    --danger-bg: #7f1d1d;
    --danger-text: #fca5a5;
    --danger-hover: #991b1b;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
    --scrollbar: #475569;
    --focus-ring: rgba(59, 130, 246, 0.2);
    --menu-bg: #1e293b;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    transition: background-color 0.2s, color 0.2s;
}

/* Container Refinement */
#wrapper,
#loginform {
    width: 100%;
    max-width: 560px;
    background: var(--bg-surface);
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
}

#wrapper {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 40px);
    max-height: 700px;
}

/* Header/Menu */
#menu {
    display: flex;
    align-items: center;
    padding: 14px 20px;
    background-color: var(--menu-bg);
    border-bottom: 1px solid var(--border);
    gap: 6px;
    transition: background-color 0.2s, border-color 0.2s;
}

#menu .left-group {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-heading);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}

#month-select {
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    padding: 4px 8px;
    border: 1px solid var(--border-input);
    border-radius: 6px;
    background: var(--bg-surface);
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
    margin: 0 auto;
    flex-shrink: 0;
}

#month-select:focus {
    border-color: var(--accent);
}

#dark-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    padding: 4px 8px;
    color: var(--text-secondary);
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

#dark-toggle:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
}

#exit {
    background-color: var(--danger-bg);
    color: var(--danger-text);
    padding: 6px 14px;
    font-size: 0.85rem;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.2s;
    margin-left: auto;
    flex-shrink: 0;
}

#exit:hover {
    background-color: var(--danger-hover);
}

/* Chatbox Area */
#chatbox {
    flex: 1;
    background: var(--bg-surface);
    padding: 16px 20px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar) transparent;
    transition: background 0.2s;
}

#chatbox::-webkit-scrollbar {
    width: 6px;
}

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

#chatbox::-webkit-scrollbar-thumb {
    background: var(--scrollbar);
    border-radius: 3px;
}

/* Message Bubbles */
.msgln {
    margin-bottom: 12px;
    line-height: 1.5;
    font-size: 0.9rem;
    padding: 8px 12px;
    border-radius: 8px;
    width: fit-content;
    max-width: 85%;
    clear: both;
}

.msgln-left {
    float: left;
    background: var(--bubble-self);
    border: 1px solid var(--bubble-self-border);
    border-bottom-left-radius: 4px;
    margin-right: auto;
}

.msgln-right {
    float: right;
    background: var(--accent-light);
    border: 1px solid var(--accent-light);
    border-bottom-right-radius: 4px;
    margin-left: auto;
}

.msgln-right .chat-user {
    color: var(--accent-text);
}

.msgln .chat-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.chat-user {
    color: var(--accent);
    font-weight: 600;
}

.msgln .chat-text {
    display: block;
    color: var(--text-primary);
    margin-top: 2px;
    white-space: pre-wrap;
}

.msgln .left-info {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.85rem;
}

/* Input Area */
form[name="message"] {
    display: flex;
    padding: 16px;
    background: var(--bg-surface-hover);
    gap: 10px;
    border-top: 1px solid var(--border);
    transition: background 0.2s, border-color 0.2s;
}

#usermsg {
    flex: 1;
    border: 1px solid var(--border-input);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 0.9rem;
    outline: none;
    resize: none;
    font-family: 'Inter', sans-serif;
    line-height: 1.4;
    min-height: 40px;
    max-height: 120px;
    background: var(--bg-surface);
    color: var(--text-primary);
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

#usermsg:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

#submitmsg {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0 20px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

#submitmsg:hover {
    background: var(--accent-hover);
}

/* Login Form Specifics */
#loginform {
    padding: 40px;
    text-align: center;
}

#loginform p {
    margin-bottom: 10px;
    color: var(--text-secondary);
}

#loginform p:first-of-type {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-heading);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
}

#name {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-input);
    border-radius: 8px;
    background: var(--bg-surface);
    color: var(--text-primary);
}

#enter {
    width: 100%;
    padding: 12px;
    background: var(--accent);
    color: white;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
}

.error {
    color: var(--danger-text);
    font-size: 0.85rem;
    margin-top: 5px;
}

#archive-notice {
    padding: 16px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--bg-surface-hover);
    border-top: 1px solid var(--border);
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

#archive-notice a {
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
}

#archive-notice a:hover {
    text-decoration: underline;
}

#loginform #dark-toggle {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    padding: 4px 8px;
    color: var(--text-secondary);
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

#loginform #dark-toggle:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
}

#loginform {
    position: relative;
}

@media (max-width: 480px) {
    body {
        align-items: stretch;
        padding: 0;
    }

    #wrapper,
    #loginform {
        max-width: 100%;
        border-radius: 0;
        border-left: none;
        border-right: none;
        min-height: 100vh;
    }

    #menu {
        padding: 12px 14px;
        gap: 6px;
    }

    #menu .left-group {
        font-size: 0.85rem;
    }

    #month-select {
        font-size: 0.8rem;
        padding: 3px 6px;
    }

    #exit {
        font-size: 0.8rem;
        padding: 5px 10px;
    }

    #wrapper {
        height: 100vh;
        max-height: none;
        border-radius: 0;
    }

    #chatbox {
        padding: 14px;
    }

    form[name="message"] {
        padding: 12px;
    }

    #loginform {
        padding: 30px 20px;
    }

    #loginform #dark-toggle {
        top: 12px;
        right: 12px;
    }
}