@font-face {
  font-family: 'TwitterChirp';
  src: url('https://abs.twimg.com/fonts/chirp-regular-web.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'TwitterChirp';
  src: url('https://abs.twimg.com/fonts/chirp-medium-web.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'TwitterChirp';
  src: url('https://abs.twimg.com/fonts/chirp-bold-web.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'TwitterChirp';
  src: url('https://abs.twimg.com/fonts/chirp-heavy-web.woff2') format('woff2');
  font-weight: 800;
  font-style: normal;
  font-display: swap;
}

:root {
    --bg-color: #f3f4f6;
    --panel-bg: #ffffff;
    --text-primary: #0f1419;
    --text-secondary: #536471;
    --border-color: #eff3f4;
    --accent-color: #1d9bf0;
    --accent-hover: #1a8cd8;
    
    /* Light mode canvas */
    --canvas-bg-light: #ffffff;
    --canvas-text-light: #0f1419;
    --canvas-text-sec-light: #536471;
    
    /* Dark mode canvas */
    --canvas-bg-dark: #000000;
    --canvas-text-dark: #e7e9ea;
    --canvas-text-sec-dark: #71767b;
}

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

body {
    font-family: "TwitterChirp", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.app-container {
    display: flex;
    flex-direction: row;
    gap: 40px;
    max-width: 1000px;
    width: 100%;
    align-items: flex-start;
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
        align-items: center;
    }
}

.controls {
    flex: 1;
    background: var(--panel-bg);
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    max-width: 400px;
    width: 100%;
}

.controls h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

.controls p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

input[type="text"] {
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
}

input[type="text"]:focus {
    border-color: var(--accent-color);
}

button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.2s;
}

button:hover {
    background-color: var(--accent-hover);
}

button:disabled {
    background-color: #a5d0f5;
    cursor: not-allowed;
}

.download-btn {
    width: 100%;
    background-color: #0f1419;
    margin-top: 20px;
}

.download-btn:hover {
    background-color: #272c30;
}

.download-btn:disabled {
    background-color: #878a8c;
}

.options {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

/* Toggle Switch */
.toggle-switch {
    display: flex;
    align-items: center;
    cursor: pointer;
    gap: 12px;
}

.toggle-switch input {
    display: none;
}

.slider {
    position: relative;
    width: 44px;
    height: 24px;
    background-color: #ccc;
    border-radius: 24px;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

.label-text {
    font-size: 14px;
    font-weight: 500;
}

.status-message {
    margin-top: 16px;
    font-size: 13px;
    color: #f4212e;
    min-height: 20px;
}

/* Preview Area */
.preview-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 9:16 Aspect Ratio Canvas */
.tiktok-canvas {
    width: 360px;
    height: 640px; /* 9:16 ratio */
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border-radius: 12px;
    transition: background-color 0.3s;
    display: flex;
    flex-direction: column;
    justify-content: safe center;
}

.tiktok-canvas.light-mode {
    background-color: var(--canvas-bg-light);
    color: var(--canvas-text-light);
}

.tiktok-canvas.dark-mode {
    background-color: var(--canvas-bg-dark);
    color: var(--canvas-text-dark);
}

.tweet-wrapper {
    padding: 0 30px;
    z-index: 20;
}

.tweet-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.tweet-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
}

.tweet-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.more-icon {
    width: 20px;
    height: 20px;
    fill: #536471;
    margin-top: 4px;
}

.light-mode .more-icon {
    fill: #536471;
}

.dark-mode .more-icon {
    fill: #71767b;
}

.tweet-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
}

.tweet-user-info {
    display: flex;
    flex-direction: column;
}

.tweet-name-row {
    display: flex;
    align-items: center;
    gap: 2px;
}

.tweet-name {
    font-weight: 700;
    font-size: 15px;
    line-height: 20px;
}

.verified-icon {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    margin-top: 2px;
}

.verified-icon.hidden {
    display: none;
}

.tweet-handle {
    font-size: 15px;
    font-weight: 700;
}

.light-mode .tweet-handle {
    color: var(--canvas-text-sec-light);
}

.dark-mode .tweet-handle {
    color: var(--canvas-text-sec-dark);
}

.tweet-text {
    font-size: 17px;
    font-weight: 500;
    line-height: 24px;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--text-primary);
}

.light-mode .tweet-text {
    color: #0f1419;
}

.dark-mode .tweet-text {
    color: #e7e9ea;
}

.tweet-media {
    margin-top: 12px;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    cursor: pointer;
}

.dark-mode .tweet-media {
    border-color: #2f3336;
}

#tweetImage {
    width: 100%;
    height: auto;
    display: block;
}

.format-tools {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.format-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.format-buttons {
    display: flex;
    gap: 8px;
}

.format-btn {
    background-color: #eff3f4;
    color: #0f1419;
    padding: 8px 12px;
    border-radius: 6px;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.format-btn:hover {
    background-color: #d7dbdc;
}

/* Metrics */
.tweet-metrics {
    display: flex;
    flex-direction: column;
    margin-top: 12px;
    font-size: 15px;
    color: var(--text-secondary);
}

.tweet-date-row {
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.tweet-stats-row {
    padding-top: 12px;
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.tweet-stats-row strong {
    color: var(--text-primary);
    font-weight: 700;
}

.dark-mode .tweet-metrics {
    color: var(--canvas-text-sec-dark);
}

.dark-mode .tweet-date-row {
    border-color: #2f3336;
}

.dark-mode .tweet-stats-row strong {
    color: var(--canvas-text-dark);
}

/* Spinner */
.spinner {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s linear infinite;
    margin-left: 8px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.is-loading .spinner {
    display: inline-block;
}

.generate-btn-content {
    display: flex;
    align-items: center;
    justify-content: center;
}