:root {
    --bg-dark: #ffffff;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --primary: #1e3a8a;
    --primary-hover: #1e40af;
    --success: #10b981;
    --danger: #ef4444;
    --text-main: #0f172a;
    --text-muted: #475569;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Poppins', sans-serif; }
h1, h2, h3, h4, h5, h6 { font-family: 'Montserrat', sans-serif; }

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
}

/* --- LAYOUT --- */
.robot-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navbar */
.robot-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    margin-bottom: 30px;
}

.logo { font-size: 1.5rem; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.highlight { color: var(--primary); }

.back-link {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    display: flex; align-items: center; gap: 5px;
    transition: 0.3s;
}
.back-link:hover { color: white; }

/* Card */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(30, 58, 138, 0.08);
}

.card-header { text-align: center; margin-bottom: 30px; }
.card-header h1 { font-size: 1.8rem; margin-bottom: 5px; }
.card-header p { color: var(--text-muted); font-size: 0.9rem; }

/* Form Grid */
.grid-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.full-width { grid-column: 1 / -1; }

.input-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.select-wrapper { position: relative; }
.select-wrapper select {
    width: 100%;
    padding: 12px 15px;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-main);
    outline: none;
    appearance: none;
    cursor: pointer;
    font-size: 1rem;
}
.select-wrapper .icon {
    position: absolute; right: 15px; top: 15px; color: var(--text-muted); pointer-events: none;
}

/* Count Buttons */
.count-options { display: flex; gap: 10px; }
.count-btn {
    flex: 1;
    padding: 10px;
    background: #f8f9fa;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-main);
    cursor: pointer;
    transition: 0.3s;
}
.count-btn:hover, .count-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Primary Button */
.primary-btn {
    width: 100%;
    padding: 16px;
    background: var(--primary);
    border: none;
    border-radius: 4px;
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.3s;
    display: flex; align-items: center; justify-content: center; gap: 10px;
    box-shadow: 0 4px 15px rgba(30, 58, 138, 0.2);
}
.primary-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(30, 58, 138, 0.3); }

/* --- QUESTION SCREEN --- */
.progress-bar-container { margin-bottom: 30px; }
.progress-info { display: flex; justify-content: space-between; margin-bottom: 10px; font-size: 0.9rem; font-weight: 600; }
.badge { background: var(--primary); padding: 2px 8px; border-radius: 4px; font-size: 0.7rem; color: white; }
.progress-track { width: 100%; height: 6px; background: #e2e8f0; border-radius: 3px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--success); width: 0%; transition: width 0.3s; }

.tags { display: flex; gap: 10px; margin-bottom: 20px; }
.tag { font-size: 0.8rem; background: #f8f9fa; border: 1px solid var(--border); padding: 5px 10px; border-radius: 4px; color: var(--text-main); }

.question-text {
    font-size: 1.3rem;
    line-height: 1.6;
    margin-bottom: 30px;
    font-weight: 500;
}

.options-grid { display: grid; gap: 15px; }
.option-btn-large {
    width: 100%;
    padding: 18px;
    text-align: left;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-main);
    cursor: pointer;
    transition: 0.2s;
    font-size: 1rem;
}
.option-btn-large:hover { background: #f8f9fa; }
.option-btn-large.correct { background: rgba(16, 185, 129, 0.1); border-color: var(--success); color: var(--success); }
.option-btn-large.wrong { background: rgba(239, 68, 68, 0.1); border-color: var(--danger); color: var(--danger); }

/* Solution */
.solution-box {
    margin-top: 20px;
    padding: 20px;
    background: rgba(30, 58, 138, 0.05);
    border: 1px solid rgba(30, 58, 138, 0.2);
    border-radius: 4px;
    color: var(--primary);
}
.solution-box h3 { font-size: 1rem; margin-bottom: 10px; display: flex; align-items: center; gap: 5px; }
.next-btn { width: 100%; padding: 12px; background: var(--primary); color: white; border: none; border-radius: 4px; margin-top: 15px; cursor: pointer; font-weight: bold; }

/* Loading */
.loading-state { text-align: center; padding: 50px 0; }
.spinner { width: 40px; height: 40px; border: 4px solid #e2e8f0; border-left-color: var(--primary); border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 15px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Result Screen */
.result-center { text-align: center; display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 400px; }
.trophy-icon { font-size: 4rem; margin-bottom: 20px; }
.stats-row { display: flex; gap: 40px; margin: 30px 0; }
.stat { display: flex; flex-direction: column; }
.stat .label { font-size: 0.9rem; color: var(--text-muted); }
.stat .value { font-size: 2.5rem; font-weight: 800; }
.stat.success .value { color: var(--success); }
.stat.danger .value { color: var(--danger); }
.actions { display: flex; gap: 15px; width: 100%; }
.outline-btn { flex: 1; padding: 14px; background: #ffffff; border: 1px solid var(--border); color: var(--text-main); border-radius: 4px; cursor: pointer; }
.outline-btn:hover { background: #f8f9fa; }

.hidden { display: none !important; }

@media (max-width: 768px) {
    .grid-form { grid-template-columns: 1fr; }
    .actions { flex-direction: column; }
}