body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background-color: #f0f2f5; margin: 0; padding: 20px; color: #1c1e21; }
.container { max-width: 800px; margin: auto; }
h1 { text-align: center; color: #1c1e21; }
.subtitle { text-align: center; color: #606770; font-size: 14px; margin-top: -10px; }
.card { background: #fff; border-radius: 8px; padding: 20px; margin-bottom: 20px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
hr { border: 0; border-top: 1px solid #ddd; margin: 20px 0; }
.session-setup { display: flex; gap: 20px; }
.setup-step { flex: 1; text-align: center; }
.setup-step p { font-size: 14px; }
input[type="text"] { width: calc(100% - 22px); padding: 10px; margin-bottom: 10px; border: 1px solid #ddd; border-radius: 6px; font-size: 16px; }
input:disabled { background-color: #f0f2f5; cursor: not-allowed; }
button, .button-like { display: inline-block; width: calc(100% - 22px); text-align: center; padding: 12px; border: none; background-color: #1877f2; color: white; border-radius: 6px; font-size: 16px; cursor: pointer; transition: background-color 0.2s; margin-bottom: 10px; }
button:hover, .button-like:hover { background-color: #166fe5; }
button:disabled { background-color: #a0bdf5; cursor: not-allowed; }
.secondary-btn { background-color: #6c757d; }
.secondary-btn:hover { background-color: #5a6268; }
.status { margin-top: 10px; font-size: 14px; color: #606770; min-height: 18px; font-weight: bold; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 15px; margin-top: 20px; }
.gallery img { width: 100%; height: auto; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); object-fit: cover; aspect-ratio: 1 / 1; }