@import url('https://fonts.googleapis.com/css2?family=Merriweather:wght@700&family=Inter:wght@400;500;600&display=swap');
:root {
    --ds-primary: #f26b52;
    --ds-secondary: #0a4f57;
    --ds-premium-green: #25D366;
    --ds-bg: #fdfbf7;
    --ds-card-bg: #ffffff;
    --ds-border: #efece6;
    --ds-radius: 12px;
}
.ds-wrapper {
    font-family: 'Inter', sans-serif;
    display: flex;
    justify-content: center;
    padding: 60px 20px 20px 20px;
    background-color: transparent;
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}
/* FULLSCREEN STYLES */
#ds-fullscreen-btn {
    position: absolute;
    bottom: -40px;
    right: 0;
    background: rgba(0,0,0,0.1);
    color: #333;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    display: flex; align-items: center; justify-content: center;
    z-index: 20;
    transition: 0.3s;
}
#ds-fullscreen-btn:hover { background: rgba(0,0,0,0.8); color: white; }
/* Active Fullscreen State */
.ds-wrapper.fullscreen-mode {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    z-index: 999999;
    align-items: center;
    max-width: none;
    padding: 0;
    box-sizing: border-box;
}
.ds-wrapper.fullscreen-mode .ds-card {
    max-width: 500px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    width: 90%; /* Responsive width */
}
/* FIX: Mobile Exit Button - Top Right & Visible */
.ds-wrapper.fullscreen-mode #ds-fullscreen-btn {
    bottom: auto;
    top: 20px;
    right: 20px;
    background: white; /* High visibility */
    color: black;
    width: 40px;
    height: 40px;
    font-size: 24px;
    box-shadow: 0 2px 10px rgba(255,255,255,0.2);
}
.ds-wrapper.fullscreen-mode #ds-fullscreen-btn:hover { background: #eee; }
/* STANDARD UI */
.ds-level-picker-container { position: absolute; top: 0; left: 0; z-index: 10; }
.ds-level-picker-container select {
    background: white; border: 1px solid #ddd; padding: 8px 16px;
    border-radius: 20px; font-weight: 600; color: var(--ds-secondary); outline: none;
}
.ds-card {
    background: var(--ds-card-bg); width: 100%; border-radius: var(--ds-radius);
    box-shadow: 0 4px 24px rgba(0,0,0,0.06); padding: 40px;
    position: relative; border: 1px solid var(--ds-border);
}
.ds-card.center-content { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 20px; }
h2, h3, h4 { font-family: 'Merriweather', serif; color: var(--ds-secondary); margin: 0 0 10px 0; }
.ds-header { display: flex; justify-content: space-between; margin-bottom: 25px; color: #999; font-weight: 600; text-transform: uppercase; font-size: 13px; }
.ds-progress span { color: var(--ds-primary); }
.ds-sign-image {
    width: 100%; height: 280px; background: #f8f8f8; border-radius: 8px;
    overflow: hidden; margin-bottom: 30px; display: flex; align-items: center; justify-content: center; border: 1px solid #eee;
}
.ds-sign-image img { max-width: 100%; max-height: 100%; object-fit: contain; }
.ds-btn { border: none; padding: 16px 32px; border-radius: 100px; font-weight: 600; cursor: pointer; transition: all 0.2s ease; text-decoration: none; display: inline-block; text-align: center; }
.ds-btn-primary { background-color: #163C1C; color: white; }
.ds-btn-secondary { background-color: var(--ds-secondary); color: white; }
.ds-btn-premium { background-color: #163C1C; color: white; width: 100%; font-size: 1.1em; }
.ds-btn-premium:hover { background-color: #0f2b0f; transform: translateY(-1px); }
.ds-btn-primary:hover { background-color: #0f2b0f; transform: translateY(-1px); }
.ds-grid-options { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.ds-option-btn {
    background: white; border: 1px solid #ddd; padding: 20px; border-radius: 12px;
    font-size: 1rem; color: var(--ds-text); cursor: pointer; transition: all 0.2s;
    text-align: center; font-weight: 500; position: relative;
}
.ds-option-btn:hover { border-color: var(--ds-primary); transform: translateY(-2px); }
.ds-option-btn.correct { background-color: var(--ds-premium-green); border-color: var(--ds-premium-green); color: white; }
.ds-option-btn.correct::after { content: " ✔"; font-weight: bold; }
.ds-option-btn.wrong { background-color: #ffcccc; border-color: red; color: #333; opacity: 0.8; }
.ds-option-btn.wrong::after { content: " ✖"; font-weight: bold; color: red; }
.ds-feedback, .ds-reveal-content { margin-top: 25px; padding: 20px; background: #fdfbf7; border-radius: 8px; border: 1px solid #efece6; text-align: left; }
.ds-spinner { border: 4px solid #f3f3f3; border-top: 4px solid var(--ds-primary); border-radius: 50%; width: 40px; height: 40px; animation: spin 1s linear infinite; margin: 50px auto; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
.ds-summary-screen.high-score { background-color: #e6ffe6; border-color: #28a745; }
.ds-summary-screen.low-score { background-color: #fff3e6; border-color: #fd7e14; }
@media (max-width: 480px) {
    .ds-grid-options { grid-template-columns: 1fr; }
    .ds-wrapper { padding-top: 60px; }
}