/* Custom CSS extensions for Tailwind */

body {
    font-family:
        'Inter',
        -apple-system,
        BlinkMacSystemFont,
        'Segoe UI',
        Roboto,
        Helvetica,
        Arial,
        sans-serif;
}

/* Card Styling */
.card {
    background-color: #ffffff;
    border-radius: 1rem;
    box-shadow:
        0 4px 6px -1px rgba(0, 0, 0, 0.05),
        0 2px 4px -1px rgba(0, 0, 0, 0.03);
    border: 1px solid #e2e8f0;
    padding: 2rem;
}

/* Inputs & Buttons */
.custom-input {
    width: 100%;
    border-radius: 0.5rem;
    border: 1px solid #cbd5e1;
    padding: 0.75rem 1rem;
    color: #334155;
    background-color: #ffffff;
    transition: all 0.2s ease-in-out;
}

.custom-input:focus {
    outline: none;
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn-primary {
    background-color: #4f46e5;
    color: white;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.btn-primary:hover:not(:disabled) {
    background-color: #4338ca;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.2);
}

.btn-primary:disabled {
    background-color: #94a3b8;
    cursor: not-allowed;
}

/* Animations */
.fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-up {
    animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loaders */
.loader-spinner {
    border: 3px solid rgba(226, 232, 240, 1); /* slate-200 */
    border-top: 3px solid #6366f1; /* indigo-500 */
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.loader-dots div {
    width: 6px;
    height: 6px;
    background: white;
    border-radius: 50%;
    margin: 0 2px;
    animation: bounce 0.5s alternate infinite;
}

.loader-dots div:nth-child(2) {
    animation-delay: 0.15s;
}
.loader-dots div:nth-child(3) {
    animation-delay: 0.3s;
}

@keyframes bounce {
    from {
        transform: translateY(0);
        opacity: 0.5;
    }
    to {
        transform: translateY(-4px);
        opacity: 1;
    }
}

/* Score Gradient specific text styling handled by tailwind classes */

/* Secondary Button */
.btn-secondary {
    background-color: #f1f5f9;
    color: #475569;
    font-weight: 500;
    padding: 0.625rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.2s;
    border: 1px solid #e2e8f0;
}
.btn-secondary:hover {
    background-color: #e2e8f0;
}

/* Topic Chips */
.topic-chip {
    padding: 0.3rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    background: #ede9fe;
    color: #5b21b6;
    border: 1px solid #ddd6fe;
    transition: all 0.15s;
    cursor: pointer;
}
.topic-chip:hover {
    background: #c4b5fd;
    border-color: #a78bfa;
}

/* Difficulty / Count / QType Buttons */
.diff-btn,
.count-btn,
.qtype-btn {
    background: #f8fafc;
    color: #64748b;
    border-color: #e2e8f0;
}
.diff-btn:hover,
.count-btn:hover,
.qtype-btn:hover {
    border-color: #a5b4fc;
    color: #4338ca;
    background: #eef2ff;
}
.active-diff,
.active-count,
.active-qtype {
    background: #eef2ff !important;
    color: #4338ca !important;
    border-color: #a5b4fc !important;
    font-weight: 600;
}

/* Loader dots inline flex */
.loader-dots {
    display: flex;
    align-items: center;
}

/* Card compact padding on small screens */
@media (max-width: 640px) {
    .card {
        padding: 1.25rem;
    }
}