/* --- Modern CSS Reset & Base --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* --- Farbschema & Variablen --- */
:root {
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    /* Light Theme */
    --bg-color: #f4f7f9;
    --surface-color: #ffffff;
    --text-color: #1a1a1a;
    --subtle-text-color: #5c5c5c;
    --border-color: #e1e4e8;
    --accent-color: #007aff;
    --accent-text-color: #ffffff;
    --user-message-bg: #007aff;
    --gemini-message-bg: #e9e9eb;
    --gemini-message-text: #1a1a1a;

    /* Transitions */
    --transition-speed: 0.3s ease;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --text-color: #e1e1e1;
    --subtle-text-color: #a0a0a0;
    --border-color: #3a3a3c;
    --accent-color: #0a84ff;
    --user-message-bg: #0a84ff;
    --gemini-message-bg: #2c2c2e;
    --gemini-message-text: #e1e1e1;
}

/* --- Globale Stile --- */
html {
    /* This is needed for the anti-flash script to work on the root element */
    background-color: var(--bg-color);
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* --- Header --- */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

header h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.model-selector, .theme-switcher {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

select, button {
    font-family: inherit;
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--surface-color);
    color: var(--text-color);
    cursor: pointer;
    transition: background-color var(--transition-speed), border-color var(--transition-speed), color var(--transition-speed);
}

button:hover, select:hover {
    border-color: var(--accent-color);
}

/* --- Chat Container --- */
main#chat-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    overflow-y: hidden; /* Let the messages div handle scrolling */
}

#chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 0 1rem 1rem 1rem; /* Added padding-bottom here */
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* --- Chat Messages (Bubbles) --- */
.message {
    display: flex;
    flex-direction: column;
    max-width: 80%;
}

.message strong {
    font-size: 0.8rem;
    color: var(--subtle-text-color);
    margin-bottom: 0.25rem;
    padding: 0 0.75rem;
}

.message span {
    padding: 0.75rem;
    border-radius: 18px;
    line-height: 1.5;
    /* Ensure markdown content respects padding */
    display: block; 
}

.message[data-sender="You"] {
    align-self: flex-end;
    align-items: flex-end;
}

.message[data-sender="You"] span {
    background-color: var(--user-message-bg);
    color: var(--accent-text-color);
    border-bottom-right-radius: 4px;
}

.message[data-sender="Gemini"], .message[data-sender="Error"] {
    align-self: flex-start;
    align-items: flex-start;
}

.message[data-sender="Gemini"] span {
    background-color: var(--gemini-message-bg);
    color: var(--gemini-message-text);
    border-bottom-left-radius: 4px;
}

.message[data-sender="Error"] span {
    background-color: #ff3b3020; /* Reddish background */
    color: #ff3b30;
    border: 1px solid #ff3b3080;
}

/* --- Markdown Styling within messages --- */
.message span h1, .message span h2, .message span h3, .message span h4, .message span h5, .message span h6 {
    margin-top: 1em;
    margin-bottom: 0.5em;
    font-weight: 600;
    line-height: 1.2;
}

.message span h1 { font-size: 1.5em; }
.message span h2 { font-size: 1.3em; }
.message span h3 { font-size: 1.1em; }

.message span p {
    margin-bottom: 1em;
}

.message span ul, .message span ol {
    margin-left: 1.5em;
    margin-bottom: 1em;
}

.message span li {
    margin-bottom: 0.5em;
}

.message span pre {
    background-color: rgba(0, 0, 0, 0.1);
    padding: 0.75em;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1em;
}

.message span code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    font-size: 0.9em;
    background-color: rgba(0, 0, 0, 0.05);
    padding: 0.2em 0.4em;
    border-radius: 4px;
}

.message span pre code {
    background-color: transparent;
    padding: 0;
}

.message span a {
    color: var(--accent-color);
    text-decoration: none;
}

.message span a:hover {
    text-decoration: underline;
}

.message span blockquote {
    border-left: 4px solid var(--border-color);
    padding-left: 1em;
    margin: 1em 0;
    color: var(--subtle-text-color);
}

/* Table Styling */
.message span table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0;
}

.message span th, .message span td {
    border: 1px solid var(--border-color);
    padding: 0.75em;
    text-align: left;
}

.message span thead th {
    background-color: var(--accent-color);
    color: var(--accent-text-color);
    font-weight: 600;
}


/* --- Chat Input --- */
#chat-input {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--surface-color);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

#message-input {
    flex-grow: 1;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed), border-color var(--transition-speed), color var(--transition-speed);
}

#message-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-color-translucent, #007aff33);
}

#send-button {
    background-color: var(--accent-color);
    color: var(--accent-text-color);
    border: none;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
}

#send-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

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

::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--subtle-text-color);
}