/* Card "xịn" */
.card {
    background: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    /* Dùng bóng đổ sâu hơn */
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.5);
    /* Viền nhẹ tạo hiệu ứng kính */
    transition: var(--transition-smooth);
}

/* Hiệu ứng hover nhẹ cho card */
.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* Buttons */
.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 14px var(--spacing-md);
    /* Nút cao hơn chút */
    border-radius: var(--radius-md);
    border: none;
    font-weight: 700;
    cursor: pointer;
    gap: var(--spacing-xs);
    transition: var(--transition-smooth);
    font-size: 1rem;
}

.btn--primary {
    background: var(--gradient-primary);
    /* Dùng gradient cho nút */
    color: var(--color-surface);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
    /* Bóng màu cho nút */
}

.btn--primary:active,
.btn--primary:hover {
    filter: brightness(1.1);
    transform: scale(0.98);
    box-shadow: 0 2px 6px rgba(99, 102, 241, 0.6);
}

.btn--outline {
    background-color: transparent;
    border: 2px solid var(--color-text-muted);
    color: var(--color-text-muted);
}

.btn--outline:hover {
    border-color: var(--color-text-main);
    color: var(--color-text-main);
}

.btn--circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    font-size: 2rem;
    margin: 0 auto;
}

/* Form Inputs */
.form-input,
.form-textarea,
select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-family: inherit;
    outline: none;
    background: var(--color-surface);
}

.form-input:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
}

/* Utilities & AI */
.ai-response {
    background-color: #eef2ff;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
    margin-top: var(--spacing-md);
    font-size: 0.95rem;
    line-height: 1.6;
}

.loader {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-bg);
    border-top: 3px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: inline-block;
}

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

    100% {
        transform: rotate(360deg);
    }
}

.text-danger {
    color: var(--color-danger);
}