/* --- Modern Dark Theme for LingoX (V3 Final) --- */

/* Root Variables */
:root {
    --primary-bg: #121212;
    --secondary-bg: #1e1e1e;
    --tertiary-bg: #2a2a2a;
    --primary-accent: #007aff;
    --primary-accent-hover: #0056b3;
    --primary-text: #e0e0e0;
    --secondary-text: #a0a0a0;
    --success-color: #34c759;
    --error-color: #ff3b30;
    --border-color: #3a3a3c;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --border-radius: 12px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    --transition-speed: 0.3s;
}

/* General Body Styles */
html {
    box-sizing: border-box;
}
*, *:before, *:after {
    box-sizing: inherit;
}
body {
    font-family: var(--font-family);
    background-color: var(--primary-bg);
    color: var(--primary-text);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 20px;
    margin: 0;
}

/* Fullscreen body for Face-to-Face mode */
html, body.fullscreen-body {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

/* Main Container */
.container {
    width: 100%;
    max-width: 700px;
    background-color: var(--secondary-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}
body.fullscreen-body .container {
    max-width: 100%;
    height: 100%;
    border-radius: 0;
    border: none;
    padding: 0;
}


/* Typography */
h1, h2, h3 {
    color: var(--primary-text);
    margin-bottom: 1rem;
    text-align: center;
}
h1 { font-size: 2.5rem; font-weight: 700; }
h2 { font-size: 2rem; font-weight: 600; }
p {
    color: var(--secondary-text);
    line-height: 1.6;
    text-align: center;
    margin-bottom: 1.5rem;
}
a {
    color: var(--primary-accent);
    text-decoration: none;
    transition: color var(--transition-speed);
}
a:hover {
    color: var(--primary-accent-hover);
    text-decoration: none;
}

/* Controls & Forms */
.controls {
    margin: 2rem 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
label {
    font-weight: 600;
    color: var(--primary-text);
    margin-bottom: 0.5rem;
}
select, button {
    width: 100%;
    padding: 14px;
    font-size: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    background-color: var(--tertiary-bg);
    color: var(--primary-text);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}
select:focus, button:focus {
    outline: none;
    border-color: var(--primary-accent);
}
button {
    background-color: var(--primary-accent);
    font-weight: bold;
    cursor: pointer;
}
button:disabled {
    background-color: var(--tertiary-bg);
    color: var(--secondary-text);
    cursor: not-allowed;
    opacity: 0.6;
}
button:hover:not(:disabled) {
    background-color: var(--primary-accent-hover);
}

/* Landing Page Buttons */
.mode-selection a button {
    text-align: left;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
}

/* Chat Interface */
.chat-header {
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
#partner-status {
    font-style: italic;
    color: var(--secondary-text);
}
#end-chat-btn {
    background-color: var(--error-color);
    max-width: 120px;
}

.messages-area {
    height: 40vh;
    min-height: 300px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    overflow-y: auto;
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    background-color: var(--primary-bg);
}
.bubble {
    padding: 10px 16px;
    border-radius: 20px;
    max-width: 85%;
    line-height: 1.4;
}
.bubble.mine {
    background-color: var(--primary-accent);
    color: white;
    align-self: flex-end;
}
.bubble.theirs {
    background-color: var(--tertiary-bg);
    color: var(--primary-text);
    align-self: flex-start;
}
.bubble .original {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: 4px;
}

.input-area {
    text-align: center;
}
#mic-status {
    min-height: 24px;
    font-style: italic;
}
.mic-btn {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    background-color: var(--primary-accent);
    transition: background-color 0.2s ease-in-out;
    border: none;
}
.mic-btn.listening {
    background-color: var(--error-color);
}
.mic-btn::before {
    content: '🎤'; /* Mic icon */
    font-size: 2rem;
}

/* QR Code Modal */
.qr-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.qr-modal-content {
    background-color: var(--secondary-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid var(--border-color);
}
#qrcode-display {
    margin: 1.5rem auto;
    padding: 1rem;
    background: white;
    display: inline-block;
    border-radius: 8px;
}
#copy-link-btn {
    margin-top: 1rem;
}
#cancel-qr-btn {
    margin-top: 1rem;
    background-color: var(--tertiary-bg);
}

/* Personal & Single Device Modes */
.text-display {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    background-color: var(--primary-bg);
    display: flex;
    flex-direction: column;
    min-height: 0;
}
.text-display .label {
    font-weight: bold;
    color: var(--secondary-text);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    text-align: left;
    flex-shrink: 0;
}
.main-display-text {
    font-size: 1.75rem;
    font-weight: bold;
    color: var(--primary-text);
    text-align: left;
    min-height: 50px;
    flex-shrink: 0;
}
.history-area {
    flex: 1 1 auto;
    overflow-y: auto;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}
.history-item {
    font-size: 1rem;
    color: var(--secondary-text);
    margin-bottom: 0.5rem;
    text-align: left;
}
.history-item .original {
    font-style: italic;
    opacity: 0.7;
    font-size: 0.9rem;
}

/* Face-to-Face Mode Specifics */
.split-screen-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}
.user-section {
    flex: 1 1 50%;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    min-height: 0;
}
#user1-section {
    transform: rotate(180deg);
    border-bottom: 2px solid var(--border-color);
}
.user-section .input-area {
    flex-shrink: 0;
}

/* API Docs */
pre {
    background-color: var(--primary-bg);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid var(--border-color);
}
code {
    font-family: "SF Mono", "Courier New", Courier, monospace;
    color: var(--primary-accent);
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}
th, td {
    border: 1px solid var(--border-color);
    padding: 12px;
    text-align: left;
}
th {
    background-color: var(--tertiary-bg);
}

.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 700px) {
    body:not(.fullscreen-body) {
        padding: 10px;
    }
    .container:not(.split-screen-container) {
        padding: 1.5rem;
    }
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    .messages-area {
        min-height: 60vh;
    }
}